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nova
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nova/nova/virt/libvirt/driver.py

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# Copyright 2010 United States Government as represented by the
# Administrator of the National Aeronautics and Space Administration.
# All Rights Reserved.
# Copyright (c) 2010 Citrix Systems, Inc.
# Copyright (c) 2011 Piston Cloud Computing, Inc
# Copyright (c) 2012 University Of Minho
# (c) Copyright 2013 Hewlett-Packard Development Company, L.P.
#
# Licensed under the Apache License, Version 2.0 (the "License"); you may
# not use this file except in compliance with the License. You may obtain
# a copy of the License at
#
# http://www.apache.org/licenses/LICENSE-2.0
#
# Unless required by applicable law or agreed to in writing, software
# distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
# License for the specific language governing permissions and limitations
# under the License.
"""
A connection to a hypervisor through libvirt.
Supports KVM, LXC, QEMU, UML, XEN and Parallels.
"""
import collections
import contextlib
import errno
import functools
import glob
import itertools
import mmap
import operator
import os
import shutil
import tempfile
import time
import uuid
import eventlet
from eventlet import greenthread
from eventlet import tpool
from lxml import etree
from os_brick.initiator import connector
from oslo_concurrency import processutils
from oslo_config import cfg
from oslo_log import log as logging
from oslo_serialization import jsonutils
from oslo_service import loopingcall
from oslo_utils import excutils
from oslo_utils import fileutils
from oslo_utils import importutils
from oslo_utils import strutils
from oslo_utils import timeutils
from oslo_utils import units
import six
from six.moves import range
from nova.api.metadata import base as instance_metadata
from nova import block_device
from nova.compute import arch
from nova.compute import hv_type
from nova.compute import power_state
from nova.compute import task_states
from nova.compute import utils as compute_utils
from nova.compute import vm_mode
import nova.conf
from nova.console import serial as serial_console
from nova.console import type as ctype
from nova import context as nova_context
from nova import exception
from nova.i18n import _
from nova.i18n import _LE
from nova.i18n import _LI
from nova.i18n import _LW
from nova import image
from nova.network import model as network_model
from nova import objects
from nova.objects import fields
from nova.objects import migrate_data as migrate_data_obj
from nova.pci import manager as pci_manager
from nova.pci import utils as pci_utils
from nova import utils
from nova import version
from nova.virt import block_device as driver_block_device
from nova.virt import configdrive
from nova.virt import diagnostics
from nova.virt.disk import api as disk
from nova.virt.disk.vfs import guestfs
from nova.virt import driver
from nova.virt import firewall
from nova.virt import hardware
from nova.virt.image import model as imgmodel
from nova.virt import images
from nova.virt.libvirt import blockinfo
from nova.virt.libvirt import config as vconfig
from nova.virt.libvirt import firewall as libvirt_firewall
from nova.virt.libvirt import guest as libvirt_guest
from nova.virt.libvirt import host
from nova.virt.libvirt import imagebackend
from nova.virt.libvirt import imagecache
from nova.virt.libvirt import instancejobtracker
from nova.virt.libvirt.storage import dmcrypt
from nova.virt.libvirt.storage import lvm
from nova.virt.libvirt.storage import rbd_utils
from nova.virt.libvirt import utils as libvirt_utils
from nova.virt.libvirt import vif as libvirt_vif
from nova.virt.libvirt.volume import remotefs
from nova.virt import netutils
from nova.virt import watchdog_actions
from nova import volume
from nova.volume import encryptors
libvirt = None
uefi_logged = False
LOG = logging.getLogger(__name__)
# Downtime period in milliseconds
LIVE_MIGRATION_DOWNTIME_MIN = 100
# Step count
LIVE_MIGRATION_DOWNTIME_STEPS_MIN = 3
# Delay in seconds
LIVE_MIGRATION_DOWNTIME_DELAY_MIN = 10
libvirt_opts = [
cfg.StrOpt('rescue_image_id',
help='Rescue ami image. This will not be used if an image id '
'is provided by the user.'),
cfg.StrOpt('rescue_kernel_id',
help='Rescue aki image'),
cfg.StrOpt('rescue_ramdisk_id',
help='Rescue ari image'),
cfg.StrOpt('virt_type',
default='kvm',
choices=('kvm', 'lxc', 'qemu', 'uml', 'xen', 'parallels'),
help='Libvirt domain type'),
cfg.StrOpt('connection_uri',
default='',
help='Override the default libvirt URI '
'(which is dependent on virt_type)'),
cfg.BoolOpt('inject_password',
default=False,
help='Inject the admin password at boot time, '
'without an agent.'),
cfg.BoolOpt('inject_key',
default=False,
help='Inject the ssh public key at boot time'),
cfg.IntOpt('inject_partition',
default=-2,
help='The partition to inject to : '
'-2 => disable, -1 => inspect (libguestfs only), '
'0 => not partitioned, >0 => partition number'),
cfg.BoolOpt('use_usb_tablet',
default=True,
help='Sync virtual and real mouse cursors in Windows VMs'),
cfg.StrOpt('live_migration_inbound_addr',
default=None,
help='Live migration target ip or hostname '
'(if this option is set to be None,'
'the hostname of the migration target'
'compute node will be used)'),
cfg.StrOpt('live_migration_uri',
help='Override the default libvirt live migration target URI '
'(which is dependent on virt_type) '
'(any included "%s" is replaced with '
'the migration target hostname)'),
cfg.StrOpt('live_migration_flag',
default='VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER, '
'VIR_MIGRATE_LIVE, VIR_MIGRATE_TUNNELLED',
help='Migration flags to be set for live migration',
deprecated_for_removal=True,
deprecated_reason='The correct live migration flags can be '
'inferred from the new '
'live_migration_tunnelled config option. '
'live_migration_flag will be removed to '
'avoid potential misconfiguration.'),
cfg.StrOpt('block_migration_flag',
default='VIR_MIGRATE_UNDEFINE_SOURCE, VIR_MIGRATE_PEER2PEER, '
'VIR_MIGRATE_LIVE, VIR_MIGRATE_TUNNELLED, '
'VIR_MIGRATE_NON_SHARED_INC',
help='Migration flags to be set for block migration',
deprecated_for_removal=True,
deprecated_reason='The correct block migration flags can be '
'inferred from the new '
'live_migration_tunnelled config option. '
'block_migration_flag will be removed to '
'avoid potential misconfiguration.'),
cfg.BoolOpt('live_migration_tunnelled',
help='Whether to use tunnelled migration, where migration '
'data is transported over the libvirtd connection. If '
'True, we use the VIR_MIGRATE_TUNNELLED migration flag, '
'avoiding the need to configure the network to allow '
'direct hypervisor to hypervisor communication. If '
'False, use the native transport. If not set, Nova '
'will choose a sensible default based on, for example '
'the availability of native encryption support in the '
'hypervisor.'),
cfg.IntOpt('live_migration_bandwidth',
default=0,
help='Maximum bandwidth(in MiB/s) to be used during migration. '
'If set to 0, will choose a suitable default. Some '
'hypervisors do not support this feature and will return '
'an error if bandwidth is not 0. Please refer to the '
'libvirt documentation for further details'),
cfg.IntOpt('live_migration_downtime',
default=500,
help='Maximum permitted downtime, in milliseconds, for live '
'migration switchover. Will be rounded up to a minimum '
'of %dms. Use a large value if guest liveness is '
'unimportant.' % LIVE_MIGRATION_DOWNTIME_MIN),
cfg.IntOpt('live_migration_downtime_steps',
default=10,
help='Number of incremental steps to reach max downtime value. '
'Will be rounded up to a minimum of %d steps' %
LIVE_MIGRATION_DOWNTIME_STEPS_MIN),
cfg.IntOpt('live_migration_downtime_delay',
default=75,
help='Time to wait, in seconds, between each step increase '
'of the migration downtime. Minimum delay is %d seconds. '
'Value is per GiB of guest RAM + disk to be transferred, '
'with lower bound of a minimum of 2 GiB per device' %
LIVE_MIGRATION_DOWNTIME_DELAY_MIN),
cfg.IntOpt('live_migration_completion_timeout',
default=800,
help='Time to wait, in seconds, for migration to successfully '
'complete transferring data before aborting the '
'operation. Value is per GiB of guest RAM + disk to be '
'transferred, with lower bound of a minimum of 2 GiB. '
'Should usually be larger than downtime delay * downtime '
'steps. Set to 0 to disable timeouts.'),
cfg.IntOpt('live_migration_progress_timeout',
default=150,
help='Time to wait, in seconds, for migration to make forward '
'progress in transferring data before aborting the '
'operation. Set to 0 to disable timeouts.'),
cfg.StrOpt('snapshot_image_format',
choices=('raw', 'qcow2', 'vmdk', 'vdi'),
help='Snapshot image format. Defaults to same as source image'),
cfg.StrOpt('disk_prefix',
help='Override the default disk prefix for the devices attached'
' to a server, which is dependent on virt_type. '
'(valid options are: sd, xvd, uvd, vd)'),
cfg.IntOpt('wait_soft_reboot_seconds',
default=120,
help='Number of seconds to wait for instance to shut down after'
' soft reboot request is made. We fall back to hard reboot'
' if instance does not shutdown within this window.'),
cfg.StrOpt('cpu_mode',
choices=('host-model', 'host-passthrough', 'custom', 'none'),
help='Set to "host-model" to clone the host CPU feature flags; '
'to "host-passthrough" to use the host CPU model exactly; '
'to "custom" to use a named CPU model; '
'to "none" to not set any CPU model. '
'If virt_type="kvm|qemu", it will default to '
'"host-model", otherwise it will default to "none"'),
cfg.StrOpt('cpu_model',
help='Set to a named libvirt CPU model (see names listed '
'in /usr/share/libvirt/cpu_map.xml). Only has effect if '
'cpu_mode="custom" and virt_type="kvm|qemu"'),
cfg.StrOpt('snapshots_directory',
default='$instances_path/snapshots',
help='Location where libvirt driver will store snapshots '
'before uploading them to image service'),
cfg.StrOpt('xen_hvmloader_path',
default='/usr/lib/xen/boot/hvmloader',
help='Location where the Xen hvmloader is kept'),
cfg.ListOpt('disk_cachemodes',
default=[],
help='Specific cachemodes to use for different disk types '
'e.g: file=directsync,block=none'),
cfg.StrOpt('rng_dev_path',
help='A path to a device that will be used as source of '
'entropy on the host. Permitted options are: '
'/dev/random or /dev/hwrng'),
cfg.ListOpt('hw_machine_type',
help='For qemu or KVM guests, set this option to specify '
'a default machine type per host architecture. '
'You can find a list of supported machine types '
'in your environment by checking the output of '
'the "virsh capabilities"command. The format of the '
'value for this config option is host-arch=machine-type. '
'For example: x86_64=machinetype1,armv7l=machinetype2'),
cfg.StrOpt('sysinfo_serial',
default='auto',
choices=('none', 'os', 'hardware', 'auto'),
help='The data source used to the populate the host "serial" '
'UUID exposed to guest in the virtual BIOS.'),
cfg.IntOpt('mem_stats_period_seconds',
default=10,
help='A number of seconds to memory usage statistics period. '
'Zero or negative value mean to disable memory usage '
'statistics.'),
cfg.ListOpt('uid_maps',
default=[],
help='List of uid targets and ranges.'
'Syntax is guest-uid:host-uid:count'
'Maximum of 5 allowed.'),
cfg.ListOpt('gid_maps',
default=[],
help='List of guid targets and ranges.'
'Syntax is guest-gid:host-gid:count'
'Maximum of 5 allowed.'),
cfg.IntOpt('realtime_scheduler_priority',
default=1,
help='In a realtime host context vCPUs for guest will run in '
'that scheduling priority. Priority depends on the host '
'kernel (usually 1-99)')
]
CONF = nova.conf.CONF
CONF.register_opts(libvirt_opts, 'libvirt')
CONF.import_opt('host', 'nova.netconf')
CONF.import_opt('my_ip', 'nova.netconf')
CONF.import_opt('enabled', 'nova.compute.api',
group='ephemeral_storage_encryption')
CONF.import_opt('cipher', 'nova.compute.api',
group='ephemeral_storage_encryption')
CONF.import_opt('key_size', 'nova.compute.api',
group='ephemeral_storage_encryption')
CONF.import_opt('live_migration_retry_count', 'nova.compute.manager')
CONF.import_opt('vncserver_proxyclient_address', 'nova.vnc', group='vnc')
CONF.import_opt('server_proxyclient_address', 'nova.spice', group='spice')
CONF.import_opt('vcpu_pin_set', 'nova.conf.virt')
CONF.import_opt('hw_disk_discard', 'nova.virt.libvirt.imagebackend',
group='libvirt')
CONF.import_group('workarounds', 'nova.utils')
CONF.import_opt('iscsi_use_multipath', 'nova.virt.libvirt.volume.iscsi',
group='libvirt')
DEFAULT_FIREWALL_DRIVER = "%s.%s" % (
libvirt_firewall.__name__,
libvirt_firewall.IptablesFirewallDriver.__name__)
DEFAULT_UEFI_LOADER_PATH = {
"x86_64": "/usr/share/OVMF/OVMF_CODE.fd",
"aarch64": "/usr/share/AAVMF/AAVMF_CODE.fd"
}
MAX_CONSOLE_BYTES = 100 * units.Ki
# The libvirt driver will prefix any disable reason codes with this string.
DISABLE_PREFIX = 'AUTO: '
# Disable reason for the service which was enabled or disabled without reason
DISABLE_REASON_UNDEFINED = None
# Guest config console string
CONSOLE = "console=tty0 console=ttyS0"
GuestNumaConfig = collections.namedtuple(
'GuestNumaConfig', ['cpuset', 'cputune', 'numaconfig', 'numatune'])
libvirt_volume_drivers = [
'iscsi=nova.virt.libvirt.volume.iscsi.LibvirtISCSIVolumeDriver',
'iser=nova.virt.libvirt.volume.iser.LibvirtISERVolumeDriver',
'local=nova.virt.libvirt.volume.volume.LibvirtVolumeDriver',
'fake=nova.virt.libvirt.volume.volume.LibvirtFakeVolumeDriver',
'rbd=nova.virt.libvirt.volume.net.LibvirtNetVolumeDriver',
'sheepdog=nova.virt.libvirt.volume.net.LibvirtNetVolumeDriver',
'nfs=nova.virt.libvirt.volume.nfs.LibvirtNFSVolumeDriver',
'smbfs=nova.virt.libvirt.volume.smbfs.LibvirtSMBFSVolumeDriver',
'aoe=nova.virt.libvirt.volume.aoe.LibvirtAOEVolumeDriver',
'glusterfs='
'nova.virt.libvirt.volume.glusterfs.LibvirtGlusterfsVolumeDriver',
'fibre_channel='
'nova.virt.libvirt.volume.fibrechannel.'
'LibvirtFibreChannelVolumeDriver',
'scality=nova.virt.libvirt.volume.scality.LibvirtScalityVolumeDriver',
'gpfs=nova.virt.libvirt.volume.gpfs.LibvirtGPFSVolumeDriver',
'quobyte=nova.virt.libvirt.volume.quobyte.LibvirtQuobyteVolumeDriver',
'hgst=nova.virt.libvirt.volume.hgst.LibvirtHGSTVolumeDriver',
'scaleio=nova.virt.libvirt.volume.scaleio.LibvirtScaleIOVolumeDriver',
'disco=nova.virt.libvirt.volume.disco.LibvirtDISCOVolumeDriver',
]
def patch_tpool_proxy():
"""eventlet.tpool.Proxy doesn't work with old-style class in __str__()
or __repr__() calls. See bug #962840 for details.
We perform a monkey patch to replace those two instance methods.
"""
def str_method(self):
return str(self._obj)
def repr_method(self):
return repr(self._obj)
tpool.Proxy.__str__ = str_method
tpool.Proxy.__repr__ = repr_method
patch_tpool_proxy()
# For information about when MIN_LIBVIRT_VERSION and
# NEXT_MIN_LIBVIRT_VERSION can be changed, consult
#
# https://wiki.openstack.org/wiki/LibvirtDistroSupportMatrix
#
# Currently this is effectively the min version for i686/x86_64
# + KVM/QEMU, as other architectures/hypervisors require newer
# versions. Over time, this will become a common min version
# for all architectures/hypervisors, as this value rises to
# meet them.
MIN_LIBVIRT_VERSION = (0, 10, 2)
# TODO(berrange): Re-evaluate this at start of each release cycle
# to decide if we want to plan a future min version bump.
# MIN_LIBVIRT_VERSION can be updated to match this after
# NEXT_MIN_LIBVIRT_VERSION has been at a higher value for
# one cycle
NEXT_MIN_LIBVIRT_VERSION = (1, 2, 1)
# When the above version matches/exceeds this version
# delete it & corresponding code using it
MIN_LIBVIRT_DEVICE_CALLBACK_VERSION = (1, 1, 1)
# Live snapshot requirements
MIN_LIBVIRT_LIVESNAPSHOT_VERSION = (1, 0, 0)
MIN_QEMU_LIVESNAPSHOT_VERSION = (1, 3, 0)
# BlockJobInfo management requirement
MIN_LIBVIRT_BLOCKJOBINFO_VERSION = (1, 1, 1)
# Relative block commit & rebase (feature is detected,
# this version is only used for messaging)
MIN_LIBVIRT_BLOCKJOB_RELATIVE_VERSION = (1, 2, 7)
# Libvirt version 1.2.17 is required for successfull block live migration
# of vm booted from image with attached devices
MIN_LIBVIRT_BLOCK_LM_WITH_VOLUMES_VERSION = (1, 2, 17)
# libvirt discard feature
MIN_LIBVIRT_DISCARD_VERSION = (1, 0, 6)
MIN_QEMU_DISCARD_VERSION = (1, 6, 0)
# While earlier versions could support NUMA reporting and
# NUMA placement, not until 1.2.7 was there the ability
# to pin guest nodes to host nodes, so mandate that. Without
# this the scheduler cannot make guaranteed decisions, as the
# guest placement may not match what was requested
MIN_LIBVIRT_NUMA_VERSION = (1, 2, 7)
# Versions of libvirt with known NUMA topology issues
# See bug #1449028
BAD_LIBVIRT_NUMA_VERSIONS = [(1, 2, 9, 2)]
# While earlier versions could support hugepage backed
# guests, not until 1.2.8 was there the ability to request
# a particular huge page size. Without this the scheduler
# cannot make guaranteed decisions, as the huge page size
# used by the guest may not match what was requested
MIN_LIBVIRT_HUGEPAGE_VERSION = (1, 2, 8)
# Versions of libvirt with broken cpu pinning support. This excludes
# versions of libvirt with broken NUMA support since pinning needs
# NUMA
# See bug #1438226
BAD_LIBVIRT_CPU_POLICY_VERSIONS = [(1, 2, 10)]
# qemu 2.1 introduces support for pinning memory on host
# NUMA nodes, along with the ability to specify hugepage
# sizes per guest NUMA node
MIN_QEMU_NUMA_HUGEPAGE_VERSION = (2, 1, 0)
# fsFreeze/fsThaw requirement
MIN_LIBVIRT_FSFREEZE_VERSION = (1, 2, 5)
# UEFI booting support
MIN_LIBVIRT_UEFI_VERSION = (1, 2, 9)
# Hyper-V paravirtualized time source
MIN_LIBVIRT_HYPERV_TIMER_VERSION = (1, 2, 2)
MIN_QEMU_HYPERV_TIMER_VERSION = (2, 0, 0)
MIN_LIBVIRT_HYPERV_FEATURE_VERSION = (1, 0, 0)
MIN_LIBVIRT_HYPERV_FEATURE_EXTRA_VERSION = (1, 1, 0)
MIN_QEMU_HYPERV_FEATURE_VERSION = (1, 1, 0)
# parallels driver support
MIN_LIBVIRT_PARALLELS_VERSION = (1, 2, 12)
# Ability to set the user guest password with Qemu
MIN_LIBVIRT_SET_ADMIN_PASSWD = (1, 2, 16)
# s/390 & s/390x architectures with KVM
MIN_LIBVIRT_KVM_S390_VERSION = (1, 2, 13)
MIN_QEMU_S390_VERSION = (2, 3, 0)
# libvirt < 1.3 reported virt_functions capability
# only when VFs are enabled.
# libvirt 1.3 fix f391889f4e942e22b9ef8ecca492de05106ce41e
MIN_LIBVIRT_PF_WITH_NO_VFS_CAP_VERSION = (1, 3, 0)
# ppc64/ppc64le architectures with KVM
# NOTE(rfolco): Same levels for Libvirt/Qemu on Big Endian and Little
# Endian giving the nuance around guest vs host architectures
MIN_LIBVIRT_KVM_PPC64_VERSION = (1, 2, 12)
MIN_QEMU_PPC64_VERSION = (2, 1, 0)
# Names of the types that do not get compressed during migration
NO_COMPRESSION_TYPES = ('qcow2',)
# realtime suppport
MIN_LIBVIRT_REALTIME_VERSION = (1, 2, 13)
MIN_LIBVIRT_OTHER_ARCH = {arch.S390: MIN_LIBVIRT_KVM_S390_VERSION,
arch.S390X: MIN_LIBVIRT_KVM_S390_VERSION,
arch.PPC: MIN_LIBVIRT_KVM_PPC64_VERSION,
arch.PPC64: MIN_LIBVIRT_KVM_PPC64_VERSION,
arch.PPC64LE: MIN_LIBVIRT_KVM_PPC64_VERSION,
}
MIN_QEMU_OTHER_ARCH = {arch.S390: MIN_QEMU_S390_VERSION,
arch.S390X: MIN_QEMU_S390_VERSION,
arch.PPC: MIN_QEMU_PPC64_VERSION,
arch.PPC64: MIN_QEMU_PPC64_VERSION,
arch.PPC64LE: MIN_QEMU_PPC64_VERSION,
}
class LibvirtDriver(driver.ComputeDriver):
capabilities = {
"has_imagecache": True,
"supports_recreate": True,
"supports_migrate_to_same_host": False
}
def __init__(self, virtapi, read_only=False):
super(LibvirtDriver, self).__init__(virtapi)
global libvirt
if libvirt is None:
libvirt = importutils.import_module('libvirt')
self._host = host.Host(self._uri(), read_only,
lifecycle_event_handler=self.emit_event,
conn_event_handler=self._handle_conn_event)
self._initiator = None
self._fc_wwnns = None
self._fc_wwpns = None
self._caps = None
self.firewall_driver = firewall.load_driver(
DEFAULT_FIREWALL_DRIVER,
host=self._host)
self.vif_driver = libvirt_vif.LibvirtGenericVIFDriver()
self.volume_drivers = driver.driver_dict_from_config(
self._get_volume_drivers(), self)
self._disk_cachemode = None
self.image_cache_manager = imagecache.ImageCacheManager()
self.image_backend = imagebackend.Backend(CONF.use_cow_images)
self.disk_cachemodes = {}
self.valid_cachemodes = ["default",
"none",
"writethrough",
"writeback",
"directsync",
"unsafe",
]
self._conn_supports_start_paused = CONF.libvirt.virt_type in ('kvm',
'qemu')
for mode_str in CONF.libvirt.disk_cachemodes:
disk_type, sep, cache_mode = mode_str.partition('=')
if cache_mode not in self.valid_cachemodes:
LOG.warn(_LW('Invalid cachemode %(cache_mode)s specified '
'for disk type %(disk_type)s.'),
{'cache_mode': cache_mode, 'disk_type': disk_type})
continue
self.disk_cachemodes[disk_type] = cache_mode
self._volume_api = volume.API()
self._image_api = image.API()
sysinfo_serial_funcs = {
'none': lambda: None,
'hardware': self._get_host_sysinfo_serial_hardware,
'os': self._get_host_sysinfo_serial_os,
'auto': self._get_host_sysinfo_serial_auto,
}
self._sysinfo_serial_func = sysinfo_serial_funcs.get(
CONF.libvirt.sysinfo_serial)
self.job_tracker = instancejobtracker.InstanceJobTracker()
self._remotefs = remotefs.RemoteFilesystem()
self._live_migration_flags = self._block_migration_flags = None
def _get_volume_drivers(self):
return libvirt_volume_drivers
@property
def disk_cachemode(self):
if self._disk_cachemode is None:
# We prefer 'none' for consistent performance, host crash
# safety & migration correctness by avoiding host page cache.
# Some filesystems (eg GlusterFS via FUSE) don't support
# O_DIRECT though. For those we fallback to 'writethrough'
# which gives host crash safety, and is safe for migration
# provided the filesystem is cache coherent (cluster filesystems
# typically are, but things like NFS are not).
self._disk_cachemode = "none"
if not self._supports_direct_io(CONF.instances_path):
self._disk_cachemode = "writethrough"
return self._disk_cachemode
def _set_cache_mode(self, conf):
"""Set cache mode on LibvirtConfigGuestDisk object."""
try:
source_type = conf.source_type
driver_cache = conf.driver_cache
except AttributeError:
return
cache_mode = self.disk_cachemodes.get(source_type,
driver_cache)
conf.driver_cache = cache_mode
def _do_quality_warnings(self):
"""Warn about untested driver configurations.
This will log a warning message about untested driver or host arch
configurations to indicate to administrators that the quality is
unknown. Currently, only qemu or kvm on intel 32- or 64-bit systems
is tested upstream.
"""
caps = self._host.get_capabilities()
hostarch = caps.host.cpu.arch
if (CONF.libvirt.virt_type not in ('qemu', 'kvm') or
hostarch not in (arch.I686, arch.X86_64)):
LOG.warn(_LW('The libvirt driver is not tested on '
'%(type)s/%(arch)s by the OpenStack project and '
'thus its quality can not be ensured. For more '
'information, see: https://wiki.openstack.org/wiki/'
'HypervisorSupportMatrix'),
{'type': CONF.libvirt.virt_type, 'arch': hostarch})
def _handle_conn_event(self, enabled, reason):
LOG.info(_LI("Connection event '%(enabled)d' reason '%(reason)s'"),
{'enabled': enabled, 'reason': reason})
self._set_host_enabled(enabled, reason)
def _version_to_string(self, version):
return '.'.join([str(x) for x in version])
def init_host(self, host):
self._host.initialize()
self._do_quality_warnings()
self._parse_migration_flags()
if (CONF.libvirt.virt_type == 'lxc' and
not (CONF.libvirt.uid_maps and CONF.libvirt.gid_maps)):
LOG.warn(_LW("Running libvirt-lxc without user namespaces is "
"dangerous. Containers spawned by Nova will be run "
"as the host's root user. It is highly suggested "
"that user namespaces be used in a public or "
"multi-tenant environment."))
# Stop libguestfs using KVM unless we're also configured
# to use this. This solves problem where people need to
# stop Nova use of KVM because nested-virt is broken
if CONF.libvirt.virt_type != "kvm":
guestfs.force_tcg()
if not self._host.has_min_version(MIN_LIBVIRT_VERSION):
raise exception.NovaException(
_('Nova requires libvirt version %s or greater.') %
self._version_to_string(MIN_LIBVIRT_VERSION))
if (CONF.libvirt.virt_type == 'parallels' and
not self._host.has_min_version(MIN_LIBVIRT_PARALLELS_VERSION)):
raise exception.NovaException(
_('Running Nova with parallels virt_type requires '
'libvirt version %s') %
self._version_to_string(MIN_LIBVIRT_PARALLELS_VERSION))
# Give the cloud admin a heads up if we are intending to
# change the MIN_LIBVIRT_VERSION in the next release.
if not self._host.has_min_version(NEXT_MIN_LIBVIRT_VERSION):
LOG.warning(_LW('Running Nova with a libvirt version less than '
'%(version)s is deprecated. The required minimum '
'version of libvirt will be raised to %(version)s '
'in the next release.'),
{'version': self._version_to_string(
NEXT_MIN_LIBVIRT_VERSION)})
kvm_arch = arch.from_host()
if (CONF.libvirt.virt_type in ('kvm', 'qemu') and
kvm_arch in MIN_LIBVIRT_OTHER_ARCH and
not self._host.has_min_version(
MIN_LIBVIRT_OTHER_ARCH.get(kvm_arch),
MIN_QEMU_OTHER_ARCH.get(kvm_arch))):
raise exception.NovaException(
_('Running Nova with qemu/kvm virt_type on %(arch)s '
'requires libvirt version %(libvirt_ver)s and '
'qemu version %(qemu_ver)s, or greater') %
{'arch': kvm_arch,
'libvirt_ver': self._version_to_string(
MIN_LIBVIRT_OTHER_ARCH.get(kvm_arch)),
'qemu_ver': self._version_to_string(
MIN_QEMU_OTHER_ARCH.get(kvm_arch))})
def _check_required_migration_flags(self, migration_flags, config_name):
if CONF.libvirt.virt_type == 'xen':
if (migration_flags & libvirt.VIR_MIGRATE_PEER2PEER) != 0:
LOG.warning(_LW('Removing the VIR_MIGRATE_PEER2PEER flag from '
'%(config_name)s because peer-to-peer '
'migrations are not supported by the "xen" '
'virt type'),
{'config_name': config_name})
migration_flags &= ~libvirt.VIR_MIGRATE_PEER2PEER
else:
if (migration_flags & libvirt.VIR_MIGRATE_PEER2PEER) == 0:
LOG.warning(_LW('Adding the VIR_MIGRATE_PEER2PEER flag to '
'%(config_name)s because direct migrations '
'are not supported by the %(virt_type)s '
'virt type'),
{'config_name': config_name,
'virt_type': CONF.libvirt.virt_type})
migration_flags |= libvirt.VIR_MIGRATE_PEER2PEER
if (migration_flags & libvirt.VIR_MIGRATE_UNDEFINE_SOURCE) == 0:
LOG.warning(_LW('Adding the VIR_MIGRATE_UNDEFINE_SOURCE flag to '
'%(config_name)s because, without it, migrated '
'VMs will remain defined on the source host'),
{'config_name': config_name})
migration_flags |= libvirt.VIR_MIGRATE_UNDEFINE_SOURCE
if (migration_flags & libvirt.VIR_MIGRATE_PERSIST_DEST) != 0:
LOG.warning(_LW('Removing the VIR_MIGRATE_PERSIST_DEST flag from '
'%(config_name)s as Nova ensures the VM is '
'persisted on the destination host'),
{'config_name': config_name})
migration_flags &= ~libvirt.VIR_MIGRATE_PERSIST_DEST
return migration_flags
def _check_block_migration_flags(self, live_migration_flags,
block_migration_flags):
if (live_migration_flags & libvirt.VIR_MIGRATE_NON_SHARED_INC) != 0:
LOG.warning(_LW('Removing the VIR_MIGRATE_NON_SHARED_INC flag '
'from the live_migration_flag config option '
'because it will cause all live-migrations to be '
'block-migrations instead.'))
live_migration_flags &= ~libvirt.VIR_MIGRATE_NON_SHARED_INC
if (block_migration_flags & libvirt.VIR_MIGRATE_NON_SHARED_INC) == 0:
LOG.warning(_LW('Adding the VIR_MIGRATE_NON_SHARED_INC flag to '
'the block_migration_flag config option, '
'otherwise all block-migrations will be '
'live-migrations instead.'))
block_migration_flags |= libvirt.VIR_MIGRATE_NON_SHARED_INC
return (live_migration_flags, block_migration_flags)
def _handle_live_migration_tunnelled(self, migration_flags, config_name):
if CONF.libvirt.live_migration_tunnelled is None:
return migration_flags
if CONF.libvirt.live_migration_tunnelled:
if (migration_flags & libvirt.VIR_MIGRATE_TUNNELLED) == 0:
LOG.warning(_LW('The %(config_name)s config option does not '
'contain the VIR_MIGRATE_TUNNELLED flag but '
'the live_migration_tunnelled is set to True '
'which causes VIR_MIGRATE_TUNNELLED to be '
'set'),
{'config_name': config_name})
migration_flags |= libvirt.VIR_MIGRATE_TUNNELLED
else:
if (migration_flags & libvirt.VIR_MIGRATE_TUNNELLED) != 0:
LOG.warning(_LW('The %(config_name)s config option contains '
'the VIR_MIGRATE_TUNNELLED flag but the '
'live_migration_tunnelled is set to False '
'which causes VIR_MIGRATE_TUNNELLED to be '
'unset'),
{'config_name': config_name})
migration_flags &= ~libvirt.VIR_MIGRATE_TUNNELLED
return migration_flags
def _parse_migration_flags(self):
def str2sum(str_val):
logical_sum = 0
for s in [i.strip() for i in str_val.split(',') if i]:
try:
logical_sum |= getattr(libvirt, s)
except AttributeError:
LOG.warning(_LW("Ignoring unknown libvirt live migration "
"flag '%(flag)s'"), {'flag': s})
return logical_sum
live_migration_flags = str2sum(CONF.libvirt.live_migration_flag)
block_migration_flags = str2sum(CONF.libvirt.block_migration_flag)
live_config_name = 'live_migration_flag'
block_config_name = 'block_migration_flag'
live_migration_flags = self._check_required_migration_flags(
live_migration_flags, live_config_name)
block_migration_flags = self._check_required_migration_flags(
block_migration_flags, block_config_name)
(live_migration_flags,
block_migration_flags) = self._check_block_migration_flags(
live_migration_flags, block_migration_flags)
live_migration_flags = self._handle_live_migration_tunnelled(
live_migration_flags, live_config_name)
block_migration_flags = self._handle_live_migration_tunnelled(
block_migration_flags, block_config_name)
self._live_migration_flags = live_migration_flags
self._block_migration_flags = block_migration_flags
# TODO(sahid): This method is targeted for removal when the tests
# have been updated to avoid its use
#
# All libvirt API calls on the libvirt.Connect object should be
# encapsulated by methods on the nova.virt.libvirt.host.Host
# object, rather than directly invoking the libvirt APIs. The goal
# is to avoid a direct dependency on the libvirt API from the
# driver.py file.
def _get_connection(self):
return self._host.get_connection()
_conn = property(_get_connection)
@staticmethod
def _uri():
if CONF.libvirt.virt_type == 'uml':
uri = CONF.libvirt.connection_uri or 'uml:///system'
elif CONF.libvirt.virt_type == 'xen':
uri = CONF.libvirt.connection_uri or 'xen:///'
elif CONF.libvirt.virt_type == 'lxc':
uri = CONF.libvirt.connection_uri or 'lxc:///'
elif CONF.libvirt.virt_type == 'parallels':
uri = CONF.libvirt.connection_uri or 'parallels:///system'
else:
uri = CONF.libvirt.connection_uri or 'qemu:///system'
return uri
@staticmethod
def _live_migration_uri(dest):
# Only Xen and QEMU support live migration, see
# https://libvirt.org/migration.html#scenarios for reference
uris = {
'kvm': 'qemu+tcp://%s/system',
'qemu': 'qemu+tcp://%s/system',
'xen': 'xenmigr://%s/system',
}
virt_type = CONF.libvirt.virt_type
uri = CONF.libvirt.live_migration_uri or uris.get(virt_type)
if uri is None:
raise exception.LiveMigrationURINotAvailable(virt_type=virt_type)
return uri % dest
def instance_exists(self, instance):
"""Efficient override of base instance_exists method."""
try:
self._host.get_guest(instance)
return True
except exception.NovaException:
return False
def list_instances(self):
names = []
for guest in self._host.list_guests(only_running=False):
names.append(guest.name)
return names
def list_instance_uuids(self):
uuids = []
for guest in self._host.list_guests(only_running=False):
uuids.append(guest.uuid)
return uuids
def plug_vifs(self, instance, network_info):
"""Plug VIFs into networks."""
for vif in network_info:
self.vif_driver.plug(instance, vif)
def _unplug_vifs(self, instance, network_info, ignore_errors):
"""Unplug VIFs from networks."""
for vif in network_info:
try:
self.vif_driver.unplug(instance, vif)
except exception.NovaException:
if not ignore_errors:
raise
def unplug_vifs(self, instance, network_info):
self._unplug_vifs(instance, network_info, False)
def _teardown_container(self, instance):
inst_path = libvirt_utils.get_instance_path(instance)
container_dir = os.path.join(inst_path, 'rootfs')
rootfs_dev = instance.system_metadata.get('rootfs_device_name')
LOG.debug('Attempting to teardown container at path %(dir)s with '
'root device: %(rootfs_dev)s',
{'dir': container_dir, 'rootfs_dev': rootfs_dev},
instance=instance)
disk.teardown_container(container_dir, rootfs_dev)
def _destroy(self, instance, attempt=1):
try:
guest = self._host.get_guest(instance)
except exception.InstanceNotFound:
guest = None
# If the instance is already terminated, we're still happy
# Otherwise, destroy it
old_domid = -1
if guest is not None:
try:
old_domid = guest.id
guest.poweroff()
except libvirt.libvirtError as e:
is_okay = False
errcode = e.get_error_code()
if errcode == libvirt.VIR_ERR_NO_DOMAIN:
# Domain already gone. This can safely be ignored.
is_okay = True
elif errcode == libvirt.VIR_ERR_OPERATION_INVALID:
# If the instance is already shut off, we get this:
# Code=55 Error=Requested operation is not valid:
# domain is not running
state = guest.get_power_state(self._host)
if state == power_state.SHUTDOWN:
is_okay = True
elif errcode == libvirt.VIR_ERR_INTERNAL_ERROR:
errmsg = e.get_error_message()
if (CONF.libvirt.virt_type == 'lxc' and
errmsg == 'internal error: '
'Some processes refused to die'):
# Some processes in the container didn't die
# fast enough for libvirt. The container will
# eventually die. For now, move on and let
# the wait_for_destroy logic take over.
is_okay = True
elif errcode == libvirt.VIR_ERR_OPERATION_TIMEOUT:
LOG.warn(_LW("Cannot destroy instance, operation time "
"out"),
instance=instance)
reason = _("operation time out")
raise exception.InstancePowerOffFailure(reason=reason)
elif errcode == libvirt.VIR_ERR_SYSTEM_ERROR:
if e.get_int1() == errno.EBUSY:
# NOTE(danpb): When libvirt kills a process it sends it
# SIGTERM first and waits 10 seconds. If it hasn't gone
# it sends SIGKILL and waits another 5 seconds. If it
# still hasn't gone then you get this EBUSY error.
# Usually when a QEMU process fails to go away upon
# SIGKILL it is because it is stuck in an
# uninterruptable kernel sleep waiting on I/O from
# some non-responsive server.
# Given the CPU load of the gate tests though, it is
# conceivable that the 15 second timeout is too short,
# particularly if the VM running tempest has a high
# steal time from the cloud host. ie 15 wallclock
# seconds may have passed, but the VM might have only
# have a few seconds of scheduled run time.
LOG.warn(_LW('Error from libvirt during destroy. '
'Code=%(errcode)s Error=%(e)s; '
'attempt %(attempt)d of 3'),
{'errcode': errcode, 'e': e,
'attempt': attempt},
instance=instance)
with excutils.save_and_reraise_exception() as ctxt:
# Try up to 3 times before giving up.
if attempt < 3:
ctxt.reraise = False
self._destroy(instance, attempt + 1)
return
if not is_okay:
with excutils.save_and_reraise_exception():
LOG.error(_LE('Error from libvirt during destroy. '
'Code=%(errcode)s Error=%(e)s'),
{'errcode': errcode, 'e': e},
instance=instance)
def _wait_for_destroy(expected_domid):
"""Called at an interval until the VM is gone."""
# NOTE(vish): If the instance disappears during the destroy
# we ignore it so the cleanup can still be
# attempted because we would prefer destroy to
# never fail.
try:
dom_info = self.get_info(instance)
state = dom_info.state
new_domid = dom_info.id
except exception.InstanceNotFound:
LOG.info(_LI("During wait destroy, instance disappeared."),
instance=instance)
raise loopingcall.LoopingCallDone()
if state == power_state.SHUTDOWN:
LOG.info(_LI("Instance destroyed successfully."),
instance=instance)
raise loopingcall.LoopingCallDone()
# NOTE(wangpan): If the instance was booted again after destroy,
# this may be an endless loop, so check the id of
# domain here, if it changed and the instance is
# still running, we should destroy it again.
# see https://bugs.launchpad.net/nova/+bug/1111213 for more details
if new_domid != expected_domid:
LOG.info(_LI("Instance may be started again."),
instance=instance)
kwargs['is_running'] = True
raise loopingcall.LoopingCallDone()
kwargs = {'is_running': False}
timer = loopingcall.FixedIntervalLoopingCall(_wait_for_destroy,
old_domid)
timer.start(interval=0.5).wait()
if kwargs['is_running']:
LOG.info(_LI("Going to destroy instance again."),
instance=instance)
self._destroy(instance)
else:
# NOTE(GuanQiang): teardown container to avoid resource leak
if CONF.libvirt.virt_type == 'lxc':
self._teardown_container(instance)
def destroy(self, context, instance, network_info, block_device_info=None,
destroy_disks=True, migrate_data=None):
self._destroy(instance)
self.cleanup(context, instance, network_info, block_device_info,
destroy_disks, migrate_data)
def _undefine_domain(self, instance):
try:
guest = self._host.get_guest(instance)
try:
guest.delete_configuration()
except libvirt.libvirtError as e:
with excutils.save_and_reraise_exception():
errcode = e.get_error_code()
LOG.error(_LE('Error from libvirt during undefine. '
'Code=%(errcode)s Error=%(e)s'),
{'errcode': errcode, 'e': e}, instance=instance)
except exception.InstanceNotFound:
pass
def cleanup(self, context, instance, network_info, block_device_info=None,
destroy_disks=True, migrate_data=None, destroy_vifs=True):
if destroy_vifs:
self._unplug_vifs(instance, network_info, True)
retry = True
while retry:
try:
self.unfilter_instance(instance, network_info)
except libvirt.libvirtError as e:
try:
state = self.get_info(instance).state
except exception.InstanceNotFound:
state = power_state.SHUTDOWN
if state != power_state.SHUTDOWN:
LOG.warn(_LW("Instance may be still running, destroy "
"it again."), instance=instance)
self._destroy(instance)
else:
retry = False
errcode = e.get_error_code()
LOG.exception(_LE('Error from libvirt during unfilter. '
'Code=%(errcode)s Error=%(e)s'),
{'errcode': errcode, 'e': e},
instance=instance)
reason = "Error unfiltering instance."
raise exception.InstanceTerminationFailure(reason=reason)
except Exception:
retry = False
raise
else:
retry = False
# FIXME(wangpan): if the instance is booted again here, such as the
# the soft reboot operation boot it here, it will
# become "running deleted", should we check and destroy
# it at the end of this method?
# NOTE(vish): we disconnect from volumes regardless
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
for vol in block_device_mapping:
connection_info = vol['connection_info']
disk_dev = vol['mount_device']
if disk_dev is not None:
disk_dev = disk_dev.rpartition("/")[2]
if ('data' in connection_info and
'volume_id' in connection_info['data']):
volume_id = connection_info['data']['volume_id']
encryption = encryptors.get_encryption_metadata(
context, self._volume_api, volume_id, connection_info)
if encryption:
# The volume must be detached from the VM before
# disconnecting it from its encryptor. Otherwise, the
# encryptor may report that the volume is still in use.
encryptor = self._get_volume_encryptor(connection_info,
encryption)
encryptor.detach_volume(**encryption)
try:
self._disconnect_volume(connection_info, disk_dev)
except Exception as exc:
with excutils.save_and_reraise_exception() as ctxt:
if destroy_disks:
# Don't block on Volume errors if we're trying to
# delete the instance as we may be partially created
# or deleted
ctxt.reraise = False
LOG.warn(_LW("Ignoring Volume Error on vol %(vol_id)s "
"during delete %(exc)s"),
{'vol_id': vol.get('volume_id'), 'exc': exc},
instance=instance)
if destroy_disks:
# NOTE(haomai): destroy volumes if needed
if CONF.libvirt.images_type == 'lvm':
self._cleanup_lvm(instance, block_device_info)
if CONF.libvirt.images_type == 'rbd':
self._cleanup_rbd(instance)
is_shared_block_storage = False
if migrate_data and 'is_shared_block_storage' in migrate_data:
is_shared_block_storage = migrate_data.is_shared_block_storage
if destroy_disks or is_shared_block_storage:
attempts = int(instance.system_metadata.get('clean_attempts',
'0'))
success = self.delete_instance_files(instance)
# NOTE(mriedem): This is used in the _run_pending_deletes periodic
# task in the compute manager. The tight coupling is not great...
instance.system_metadata['clean_attempts'] = str(attempts + 1)
if success:
instance.cleaned = True
instance.save()
if CONF.serial_console.enabled:
try:
guest = self._host.get_guest(instance)
serials = self._get_serial_ports_from_guest(guest)
for hostname, port in serials:
serial_console.release_port(host=hostname, port=port)
except exception.InstanceNotFound:
pass
self._undefine_domain(instance)
def _detach_encrypted_volumes(self, instance, block_device_info):
"""Detaches encrypted volumes attached to instance."""
disks = jsonutils.loads(self.get_instance_disk_info(instance,
block_device_info))
encrypted_volumes = filter(dmcrypt.is_encrypted,
[disk['path'] for disk in disks])
for path in encrypted_volumes:
dmcrypt.delete_volume(path)
def _get_serial_ports_from_guest(self, guest, mode=None):
"""Returns an iterator over serial port(s) configured on guest.
:param mode: Should be a value in (None, bind, connect)
"""
xml = guest.get_xml_desc()
tree = etree.fromstring(xml)
# The 'serial' device is the base for x86 platforms. Other platforms
# (e.g. kvm on system z = arch.S390X) can only use 'console' devices.
xpath_mode = "[@mode='%s']" % mode if mode else ""
serial_tcp = "./devices/serial[@type='tcp']/source" + xpath_mode
console_tcp = "./devices/console[@type='tcp']/source" + xpath_mode
tcp_devices = tree.findall(serial_tcp)
if len(tcp_devices) == 0:
tcp_devices = tree.findall(console_tcp)
for source in tcp_devices:
yield (source.get("host"), int(source.get("service")))
@staticmethod
def _get_rbd_driver():
return rbd_utils.RBDDriver(
pool=CONF.libvirt.images_rbd_pool,
ceph_conf=CONF.libvirt.images_rbd_ceph_conf,
rbd_user=CONF.libvirt.rbd_user)
def _cleanup_rbd(self, instance):
LibvirtDriver._get_rbd_driver().cleanup_volumes(instance)
def _cleanup_lvm(self, instance, block_device_info):
"""Delete all LVM disks for given instance object."""
if instance.get('ephemeral_key_uuid') is not None:
self._detach_encrypted_volumes(instance, block_device_info)
disks = self._lvm_disks(instance)
if disks:
lvm.remove_volumes(disks)
def _lvm_disks(self, instance):
"""Returns all LVM disks for given instance object."""
if CONF.libvirt.images_volume_group:
vg = os.path.join('/dev', CONF.libvirt.images_volume_group)
if not os.path.exists(vg):
return []
pattern = '%s_' % instance.uuid
def belongs_to_instance(disk):
return disk.startswith(pattern)
def fullpath(name):
return os.path.join(vg, name)
logical_volumes = lvm.list_volumes(vg)
disk_names = filter(belongs_to_instance, logical_volumes)
disks = map(fullpath, disk_names)
return disks
return []
def get_volume_connector(self, instance):
root_helper = utils.get_root_helper()
return connector.get_connector_properties(
root_helper, CONF.my_block_storage_ip,
CONF.libvirt.iscsi_use_multipath,
enforce_multipath=True,
host=CONF.host)
def _cleanup_resize(self, instance, network_info):
# NOTE(wangpan): we get the pre-grizzly instance path firstly,
# so the backup dir of pre-grizzly instance can
# be deleted correctly with grizzly or later nova.
pre_grizzly_name = libvirt_utils.get_instance_path(instance,
forceold=True)
target = pre_grizzly_name + '_resize'
if not os.path.exists(target):
target = libvirt_utils.get_instance_path(instance) + '_resize'
if os.path.exists(target):
# Deletion can fail over NFS, so retry the deletion as required.
# Set maximum attempt as 5, most test can remove the directory
# for the second time.
utils.execute('rm', '-rf', target, delay_on_retry=True,
attempts=5)
backend = self.image_backend.image(instance, 'disk')
# TODO(nic): Set ignore_errors=False in a future release.
# It is set to True here to avoid any upgrade issues surrounding
# instances being in pending resize state when the software is updated;
# in that case there will be no snapshot to remove. Once it can be
# reasonably assumed that no such instances exist in the wild
# anymore, it should be set back to False (the default) so it will
# throw errors, like it should.
backend.remove_snap(libvirt_utils.RESIZE_SNAPSHOT_NAME,
ignore_errors=True)
if instance.host != CONF.host:
self._undefine_domain(instance)
self.unplug_vifs(instance, network_info)
self.unfilter_instance(instance, network_info)
def _get_volume_driver(self, connection_info):
driver_type = connection_info.get('driver_volume_type')
if driver_type not in self.volume_drivers:
raise exception.VolumeDriverNotFound(driver_type=driver_type)
return self.volume_drivers[driver_type]
def _connect_volume(self, connection_info, disk_info):
vol_driver = self._get_volume_driver(connection_info)
vol_driver.connect_volume(connection_info, disk_info)
def _disconnect_volume(self, connection_info, disk_dev):
vol_driver = self._get_volume_driver(connection_info)
vol_driver.disconnect_volume(connection_info, disk_dev)
def _get_volume_config(self, connection_info, disk_info):
vol_driver = self._get_volume_driver(connection_info)
return vol_driver.get_config(connection_info, disk_info)
def _get_volume_encryptor(self, connection_info, encryption):
encryptor = encryptors.get_volume_encryptor(connection_info,
**encryption)
return encryptor
def _check_discard_for_attach_volume(self, conf, instance):
"""Perform some checks for volumes configured for discard support.
If discard is configured for the volume, and the guest is using a
configuration known to not work, we will log a message explaining
the reason why.
"""
if conf.driver_discard == 'unmap' and conf.target_bus == 'virtio':
LOG.debug('Attempting to attach volume %(id)s with discard '
'support enabled to an instance using an '
'unsupported configuration. target_bus = '
'%(bus)s. Trim commands will not be issued to '
'the storage device.',
{'bus': conf.target_bus,
'id': conf.serial},
instance=instance)
def attach_volume(self, context, connection_info, instance, mountpoint,
disk_bus=None, device_type=None, encryption=None):
guest = self._host.get_guest(instance)
disk_dev = mountpoint.rpartition("/")[2]
bdm = {
'device_name': disk_dev,
'disk_bus': disk_bus,
'device_type': device_type}
# Note(cfb): If the volume has a custom block size, check that
# that we are using QEMU/KVM and libvirt >= 0.10.2. The
# presence of a block size is considered mandatory by
# cinder so we fail if we can't honor the request.
data = {}
if ('data' in connection_info):
data = connection_info['data']
if ('logical_block_size' in data or 'physical_block_size' in data):
if ((CONF.libvirt.virt_type != "kvm" and
CONF.libvirt.virt_type != "qemu")):
msg = _("Volume sets block size, but the current "
"libvirt hypervisor '%s' does not support custom "
"block size") % CONF.libvirt.virt_type
raise exception.InvalidHypervisorType(msg)
disk_info = blockinfo.get_info_from_bdm(
instance, CONF.libvirt.virt_type, instance.image_meta, bdm)
self._connect_volume(connection_info, disk_info)
conf = self._get_volume_config(connection_info, disk_info)
self._set_cache_mode(conf)
self._check_discard_for_attach_volume(conf, instance)
try:
state = guest.get_power_state(self._host)
live = state in (power_state.RUNNING, power_state.PAUSED)
if encryption:
encryptor = self._get_volume_encryptor(connection_info,
encryption)
encryptor.attach_volume(context, **encryption)
guest.attach_device(conf, persistent=True, live=live)
except Exception as ex:
LOG.exception(_LE('Failed to attach volume at mountpoint: %s'),
mountpoint, instance=instance)
if isinstance(ex, libvirt.libvirtError):
errcode = ex.get_error_code()
if errcode == libvirt.VIR_ERR_OPERATION_FAILED:
self._disconnect_volume(connection_info, disk_dev)
raise exception.DeviceIsBusy(device=disk_dev)
with excutils.save_and_reraise_exception():
self._disconnect_volume(connection_info, disk_dev)
def _swap_volume(self, guest, disk_path, new_path, resize_to):
"""Swap existing disk with a new block device."""
dev = guest.get_block_device(disk_path)
# Save a copy of the domain's persistent XML file
xml = guest.get_xml_desc(dump_inactive=True, dump_sensitive=True)
# Abort is an idempotent operation, so make sure any block
# jobs which may have failed are ended.
try:
dev.abort_job()
except Exception:
pass
try:
# NOTE (rmk): blockRebase cannot be executed on persistent
# domains, so we need to temporarily undefine it.
# If any part of this block fails, the domain is
# re-defined regardless.
if guest.has_persistent_configuration():
guest.delete_configuration()
# Start copy with VIR_DOMAIN_REBASE_REUSE_EXT flag to
# allow writing to existing external volume file
dev.rebase(new_path, copy=True, reuse_ext=True)
while dev.wait_for_job():
time.sleep(0.5)
dev.abort_job(pivot=True)
if resize_to:
# NOTE(alex_xu): domain.blockJobAbort isn't sync call. This
# is bug in libvirt. So we need waiting for the pivot is
# finished. libvirt bug #1119173
while dev.wait_for_job(wait_for_job_clean=True):
time.sleep(0.5)
dev.resize(resize_to * units.Gi / units.Ki)
finally:
self._host.write_instance_config(xml)
def swap_volume(self, old_connection_info,
new_connection_info, instance, mountpoint, resize_to):
guest = self._host.get_guest(instance)
disk_dev = mountpoint.rpartition("/")[2]
if not guest.get_disk(disk_dev):
raise exception.DiskNotFound(location=disk_dev)
disk_info = {
'dev': disk_dev,
'bus': blockinfo.get_disk_bus_for_disk_dev(
CONF.libvirt.virt_type, disk_dev),
'type': 'disk',
}
self._connect_volume(new_connection_info, disk_info)
conf = self._get_volume_config(new_connection_info, disk_info)
if not conf.source_path:
self._disconnect_volume(new_connection_info, disk_dev)
raise NotImplementedError(_("Swap only supports host devices"))
# Save updates made in connection_info when connect_volume was called
volume_id = new_connection_info.get('serial')
bdm = objects.BlockDeviceMapping.get_by_volume_and_instance(
nova_context.get_admin_context(), volume_id, instance.uuid)
driver_bdm = driver_block_device.DriverVolumeBlockDevice(bdm)
driver_bdm['connection_info'] = new_connection_info
driver_bdm.save()
self._swap_volume(guest, disk_dev, conf.source_path, resize_to)
self._disconnect_volume(old_connection_info, disk_dev)
def _get_existing_domain_xml(self, instance, network_info,
block_device_info=None):
try:
guest = self._host.get_guest(instance)
xml = guest.get_xml_desc()
except exception.InstanceNotFound:
disk_info = blockinfo.get_disk_info(CONF.libvirt.virt_type,
instance,
instance.image_meta,
block_device_info)
xml = self._get_guest_xml(nova_context.get_admin_context(),
instance, network_info, disk_info,
instance.image_meta,
block_device_info=block_device_info)
return xml
def detach_volume(self, connection_info, instance, mountpoint,
encryption=None):
disk_dev = mountpoint.rpartition("/")[2]
try:
guest = self._host.get_guest(instance)
state = guest.get_power_state(self._host)
live = state in (power_state.RUNNING, power_state.PAUSED)
wait_for_detach = guest.detach_device_with_retry(guest.get_disk,
disk_dev,
persistent=True,
live=live)
if encryption:
# The volume must be detached from the VM before
# disconnecting it from its encryptor. Otherwise, the
# encryptor may report that the volume is still in use.
encryptor = self._get_volume_encryptor(connection_info,
encryption)
encryptor.detach_volume(**encryption)
wait_for_detach()
except exception.InstanceNotFound:
# NOTE(zhaoqin): If the instance does not exist, _lookup_by_name()
# will throw InstanceNotFound exception. Need to
# disconnect volume under this circumstance.
LOG.warn(_LW("During detach_volume, instance disappeared."),
instance=instance)
except exception.DeviceNotFound:
raise exception.DiskNotFound(location=disk_dev)
except libvirt.libvirtError as ex:
# NOTE(vish): This is called to cleanup volumes after live
# migration, so we should still disconnect even if
# the instance doesn't exist here anymore.
error_code = ex.get_error_code()
if error_code == libvirt.VIR_ERR_NO_DOMAIN:
# NOTE(vish):
LOG.warn(_LW("During detach_volume, instance disappeared."),
instance=instance)
else:
raise
self._disconnect_volume(connection_info, disk_dev)
def attach_interface(self, instance, image_meta, vif):
guest = self._host.get_guest(instance)
self.vif_driver.plug(instance, vif)
self.firewall_driver.setup_basic_filtering(instance, [vif])
cfg = self.vif_driver.get_config(instance, vif, image_meta,
instance.flavor,
CONF.libvirt.virt_type,
self._host)
try:
state = guest.get_power_state(self._host)
live = state in (power_state.RUNNING, power_state.PAUSED)
guest.attach_device(cfg, persistent=True, live=live)
except libvirt.libvirtError:
LOG.error(_LE('attaching network adapter failed.'),
instance=instance, exc_info=True)
self.vif_driver.unplug(instance, vif)
raise exception.InterfaceAttachFailed(
instance_uuid=instance.uuid)
def detach_interface(self, instance, vif):
guest = self._host.get_guest(instance)
cfg = self.vif_driver.get_config(instance, vif,
instance.image_meta,
instance.flavor,
CONF.libvirt.virt_type, self._host)
try:
self.vif_driver.unplug(instance, vif)
state = guest.get_power_state(self._host)
live = state in (power_state.RUNNING, power_state.PAUSED)
guest.detach_device(cfg, persistent=True, live=live)
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
if error_code == libvirt.VIR_ERR_NO_DOMAIN:
LOG.warn(_LW("During detach_interface, "
"instance disappeared."),
instance=instance)
else:
LOG.error(_LE('detaching network adapter failed.'),
instance=instance, exc_info=True)
raise exception.InterfaceDetachFailed(
instance_uuid=instance.uuid)
def _create_snapshot_metadata(self, image_meta, instance,
img_fmt, snp_name):
metadata = {'is_public': False,
'status': 'active',
'name': snp_name,
'properties': {
'kernel_id': instance.kernel_id,
'image_location': 'snapshot',
'image_state': 'available',
'owner_id': instance.project_id,
'ramdisk_id': instance.ramdisk_id,
}
}
if instance.os_type:
metadata['properties']['os_type'] = instance.os_type
# NOTE(vish): glance forces ami disk format to be ami
if image_meta.disk_format == 'ami':
metadata['disk_format'] = 'ami'
else:
metadata['disk_format'] = img_fmt
if image_meta.obj_attr_is_set("container_format"):
metadata['container_format'] = image_meta.container_format
else:
metadata['container_format'] = "bare"
return metadata
def snapshot(self, context, instance, image_id, update_task_state):
"""Create snapshot from a running VM instance.
This command only works with qemu 0.14+
"""
try:
guest = self._host.get_guest(instance)
# TODO(sahid): We are converting all calls from a
# virDomain object to use nova.virt.libvirt.Guest.
# We should be able to remove virt_dom at the end.
virt_dom = guest._domain
except exception.InstanceNotFound:
raise exception.InstanceNotRunning(instance_id=instance.uuid)
snapshot = self._image_api.get(context, image_id)
# source_format is an on-disk format
# source_type is a backend type
disk_path, source_format = libvirt_utils.find_disk(virt_dom)
source_type = libvirt_utils.get_disk_type_from_path(disk_path)
# We won't have source_type for raw or qcow2 disks, because we can't
# determine that from the path. We should have it from the libvirt
# xml, though.
if source_type is None:
source_type = source_format
# For lxc instances we won't have it either from libvirt xml
# (because we just gave libvirt the mounted filesystem), or the path,
# so source_type is still going to be None. In this case,
# snapshot_backend is going to default to CONF.libvirt.images_type
# below, which is still safe.
image_format = CONF.libvirt.snapshot_image_format or source_type
# NOTE(bfilippov): save lvm and rbd as raw
if image_format == 'lvm' or image_format == 'rbd':
image_format = 'raw'
metadata = self._create_snapshot_metadata(instance.image_meta,
instance,
image_format,
snapshot['name'])
snapshot_name = uuid.uuid4().hex
state = guest.get_power_state(self._host)
# NOTE(rmk): Live snapshots require QEMU 1.3 and Libvirt 1.0.0.
# These restrictions can be relaxed as other configurations
# can be validated.
# NOTE(dgenin): Instances with LVM encrypted ephemeral storage require
# cold snapshots. Currently, checking for encryption is
# redundant because LVM supports only cold snapshots.
# It is necessary in case this situation changes in the
# future.
if (self._host.has_min_version(MIN_LIBVIRT_LIVESNAPSHOT_VERSION,
MIN_QEMU_LIVESNAPSHOT_VERSION,
host.HV_DRIVER_QEMU)
and source_type not in ('lvm', 'rbd')
and not CONF.ephemeral_storage_encryption.enabled
and not CONF.workarounds.disable_libvirt_livesnapshot):
live_snapshot = True
# Abort is an idempotent operation, so make sure any block
# jobs which may have failed are ended. This operation also
# confirms the running instance, as opposed to the system as a
# whole, has a new enough version of the hypervisor (bug 1193146).
try:
guest.get_block_device(disk_path).abort_job()
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
if error_code == libvirt.VIR_ERR_CONFIG_UNSUPPORTED:
live_snapshot = False
else:
pass
else:
live_snapshot = False
# NOTE(rmk): We cannot perform live snapshots when a managedSave
# file is present, so we will use the cold/legacy method
# for instances which are shutdown.
if state == power_state.SHUTDOWN:
live_snapshot = False
# NOTE(dkang): managedSave does not work for LXC
if CONF.libvirt.virt_type != 'lxc' and not live_snapshot:
if state == power_state.RUNNING or state == power_state.PAUSED:
self._detach_pci_devices(guest,
pci_manager.get_instance_pci_devs(instance))
self._detach_sriov_ports(context, instance, guest)
guest.save_memory_state()
snapshot_backend = self.image_backend.snapshot(instance,
disk_path,
image_type=source_type)
if live_snapshot:
LOG.info(_LI("Beginning live snapshot process"),
instance=instance)
else:
LOG.info(_LI("Beginning cold snapshot process"),
instance=instance)
update_task_state(task_state=task_states.IMAGE_PENDING_UPLOAD)
try:
update_task_state(task_state=task_states.IMAGE_UPLOADING,
expected_state=task_states.IMAGE_PENDING_UPLOAD)
metadata['location'] = snapshot_backend.direct_snapshot(
context, snapshot_name, image_format, image_id,
instance.image_ref)
self._snapshot_domain(context, live_snapshot, virt_dom, state,
instance)
self._image_api.update(context, image_id, metadata,
purge_props=False)
except (NotImplementedError, exception.ImageUnacceptable,
exception.Forbidden) as e:
if type(e) != NotImplementedError:
LOG.warning(_LW('Performing standard snapshot because direct '
'snapshot failed: %(error)s'), {'error': e})
failed_snap = metadata.pop('location', None)
if failed_snap:
failed_snap = {'url': str(failed_snap)}
snapshot_backend.cleanup_direct_snapshot(failed_snap,
also_destroy_volume=True,
ignore_errors=True)
update_task_state(task_state=task_states.IMAGE_PENDING_UPLOAD,
expected_state=task_states.IMAGE_UPLOADING)
snapshot_directory = CONF.libvirt.snapshots_directory
fileutils.ensure_tree(snapshot_directory)
with utils.tempdir(dir=snapshot_directory) as tmpdir:
try:
out_path = os.path.join(tmpdir, snapshot_name)
if live_snapshot:
# NOTE(xqueralt): libvirt needs o+x in the tempdir
os.chmod(tmpdir, 0o701)
self._live_snapshot(context, instance, guest,
disk_path, out_path, source_format,
image_format, instance.image_meta)
else:
snapshot_backend.snapshot_extract(out_path,
image_format)
finally:
self._snapshot_domain(context, live_snapshot, virt_dom,
state, instance)
LOG.info(_LI("Snapshot extracted, beginning image upload"),
instance=instance)
# Upload that image to the image service
update_task_state(task_state=task_states.IMAGE_UPLOADING,
expected_state=task_states.IMAGE_PENDING_UPLOAD)
with libvirt_utils.file_open(out_path) as image_file:
self._image_api.update(context,
image_id,
metadata,
image_file)
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_LE("Failed to snapshot image"))
failed_snap = metadata.pop('location', None)
if failed_snap:
failed_snap = {'url': str(failed_snap)}
snapshot_backend.cleanup_direct_snapshot(
failed_snap, also_destroy_volume=True,
ignore_errors=True)
LOG.info(_LI("Snapshot image upload complete"), instance=instance)
def _snapshot_domain(self, context, live_snapshot, virt_dom, state,
instance):
guest = None
# NOTE(dkang): because previous managedSave is not called
# for LXC, _create_domain must not be called.
if CONF.libvirt.virt_type != 'lxc' and not live_snapshot:
if state == power_state.RUNNING:
guest = self._create_domain(domain=virt_dom)
elif state == power_state.PAUSED:
guest = self._create_domain(domain=virt_dom, pause=True)
if guest is not None:
self._attach_pci_devices(
guest, pci_manager.get_instance_pci_devs(instance))
self._attach_sriov_ports(context, instance, guest)
def _can_set_admin_password(self, image_meta):
if (CONF.libvirt.virt_type not in ('kvm', 'qemu') or
not self._host.has_min_version(MIN_LIBVIRT_SET_ADMIN_PASSWD)):
raise exception.SetAdminPasswdNotSupported()
hw_qga = image_meta.properties.get('hw_qemu_guest_agent', '')
if not strutils.bool_from_string(hw_qga):
raise exception.QemuGuestAgentNotEnabled()
def set_admin_password(self, instance, new_pass):
self._can_set_admin_password(instance.image_meta)
guest = self._host.get_guest(instance)
user = instance.image_meta.properties.get("os_admin_user")
if not user:
if instance.os_type == "windows":
user = "Administrator"
else:
user = "root"
try:
guest.set_user_password(user, new_pass)
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
msg = (_('Error from libvirt while set password for username '
'"%(user)s": [Error Code %(error_code)s] %(ex)s')
% {'user': user, 'error_code': error_code, 'ex': ex})
raise exception.NovaException(msg)
def _can_quiesce(self, instance, image_meta):
if (CONF.libvirt.virt_type not in ('kvm', 'qemu') or
not self._host.has_min_version(MIN_LIBVIRT_FSFREEZE_VERSION)):
raise exception.InstanceQuiesceNotSupported(
instance_id=instance.uuid)
if not image_meta.properties.get('hw_qemu_guest_agent', False):
raise exception.QemuGuestAgentNotEnabled()
def _set_quiesced(self, context, instance, image_meta, quiesced):
self._can_quiesce(instance, image_meta)
try:
guest = self._host.get_guest(instance)
if quiesced:
guest.freeze_filesystems()
else:
guest.thaw_filesystems()
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
msg = (_('Error from libvirt while quiescing %(instance_name)s: '
'[Error Code %(error_code)s] %(ex)s')
% {'instance_name': instance.name,
'error_code': error_code, 'ex': ex})
raise exception.NovaException(msg)
def quiesce(self, context, instance, image_meta):
"""Freeze the guest filesystems to prepare for snapshot.
The qemu-guest-agent must be setup to execute fsfreeze.
"""
self._set_quiesced(context, instance, image_meta, True)
def unquiesce(self, context, instance, image_meta):
"""Thaw the guest filesystems after snapshot."""
self._set_quiesced(context, instance, image_meta, False)
def _live_snapshot(self, context, instance, guest, disk_path, out_path,
source_format, image_format, image_meta):
"""Snapshot an instance without downtime."""
dev = guest.get_block_device(disk_path)
# Save a copy of the domain's persistent XML file
xml = guest.get_xml_desc(dump_inactive=True, dump_sensitive=True)
# Abort is an idempotent operation, so make sure any block
# jobs which may have failed are ended.
try:
dev.abort_job()
except Exception:
pass
# NOTE (rmk): We are using shallow rebases as a workaround to a bug
# in QEMU 1.3. In order to do this, we need to create
# a destination image with the original backing file
# and matching size of the instance root disk.
src_disk_size = libvirt_utils.get_disk_size(disk_path,
format=source_format)
src_back_path = libvirt_utils.get_disk_backing_file(disk_path,
format=source_format,
basename=False)
disk_delta = out_path + '.delta'
libvirt_utils.create_cow_image(src_back_path, disk_delta,
src_disk_size)
quiesced = False
try:
self._set_quiesced(context, instance, image_meta, True)
quiesced = True
except exception.NovaException as err:
if image_meta.properties.get('os_require_quiesce', False):
raise
LOG.info(_LI('Skipping quiescing instance: %(reason)s.'),
{'reason': err}, instance=instance)
try:
# NOTE (rmk): blockRebase cannot be executed on persistent
# domains, so we need to temporarily undefine it.
# If any part of this block fails, the domain is
# re-defined regardless.
if guest.has_persistent_configuration():
guest.delete_configuration()
# NOTE (rmk): Establish a temporary mirror of our root disk and
# issue an abort once we have a complete copy.
dev.rebase(disk_delta, copy=True, reuse_ext=True, shallow=True)
while dev.wait_for_job():
time.sleep(0.5)
dev.abort_job()
libvirt_utils.chown(disk_delta, os.getuid())
finally:
self._host.write_instance_config(xml)
if quiesced:
self._set_quiesced(context, instance, image_meta, False)
# Convert the delta (CoW) image with a backing file to a flat
# image with no backing file.
libvirt_utils.extract_snapshot(disk_delta, 'qcow2',
out_path, image_format)
def _volume_snapshot_update_status(self, context, snapshot_id, status):
"""Send a snapshot status update to Cinder.
This method captures and logs exceptions that occur
since callers cannot do anything useful with these exceptions.
Operations on the Cinder side waiting for this will time out if
a failure occurs sending the update.
:param context: security context
:param snapshot_id: id of snapshot being updated
:param status: new status value
"""
try:
self._volume_api.update_snapshot_status(context,
snapshot_id,
status)
except Exception:
LOG.exception(_LE('Failed to send updated snapshot status '
'to volume service.'))
def _volume_snapshot_create(self, context, instance, guest,
volume_id, new_file):
"""Perform volume snapshot.
:param guest: VM that volume is attached to
:param volume_id: volume UUID to snapshot
:param new_file: relative path to new qcow2 file present on share
"""
xml = guest.get_xml_desc()
xml_doc = etree.fromstring(xml)
device_info = vconfig.LibvirtConfigGuest()
device_info.parse_dom(xml_doc)
disks_to_snap = [] # to be snapshotted by libvirt
network_disks_to_snap = [] # network disks (netfs, gluster, etc.)
disks_to_skip = [] # local disks not snapshotted
for guest_disk in device_info.devices:
if (guest_disk.root_name != 'disk'):
continue
if (guest_disk.target_dev is None):
continue
if (guest_disk.serial is None or guest_disk.serial != volume_id):
disks_to_skip.append(guest_disk.target_dev)
continue
# disk is a Cinder volume with the correct volume_id
disk_info = {
'dev': guest_disk.target_dev,
'serial': guest_disk.serial,
'current_file': guest_disk.source_path,
'source_protocol': guest_disk.source_protocol,
'source_name': guest_disk.source_name,
'source_hosts': guest_disk.source_hosts,
'source_ports': guest_disk.source_ports
}
# Determine path for new_file based on current path
if disk_info['current_file'] is not None:
current_file = disk_info['current_file']
new_file_path = os.path.join(os.path.dirname(current_file),
new_file)
disks_to_snap.append((current_file, new_file_path))
elif disk_info['source_protocol'] in ('gluster', 'netfs'):
network_disks_to_snap.append((disk_info, new_file))
if not disks_to_snap and not network_disks_to_snap:
msg = _('Found no disk to snapshot.')
raise exception.NovaException(msg)
snapshot = vconfig.LibvirtConfigGuestSnapshot()
for current_name, new_filename in disks_to_snap:
snap_disk = vconfig.LibvirtConfigGuestSnapshotDisk()
snap_disk.name = current_name
snap_disk.source_path = new_filename
snap_disk.source_type = 'file'
snap_disk.snapshot = 'external'
snap_disk.driver_name = 'qcow2'
snapshot.add_disk(snap_disk)
for disk_info, new_filename in network_disks_to_snap:
snap_disk = vconfig.LibvirtConfigGuestSnapshotDisk()
snap_disk.name = disk_info['dev']
snap_disk.source_type = 'network'
snap_disk.source_protocol = disk_info['source_protocol']
snap_disk.snapshot = 'external'
snap_disk.source_path = new_filename
old_dir = disk_info['source_name'].split('/')[0]
snap_disk.source_name = '%s/%s' % (old_dir, new_filename)
snap_disk.source_hosts = disk_info['source_hosts']
snap_disk.source_ports = disk_info['source_ports']
snapshot.add_disk(snap_disk)
for dev in disks_to_skip:
snap_disk = vconfig.LibvirtConfigGuestSnapshotDisk()
snap_disk.name = dev
snap_disk.snapshot = 'no'
snapshot.add_disk(snap_disk)
snapshot_xml = snapshot.to_xml()
LOG.debug("snap xml: %s", snapshot_xml, instance=instance)
try:
guest.snapshot(snapshot, no_metadata=True, disk_only=True,
reuse_ext=True, quiesce=True)
return
except libvirt.libvirtError:
LOG.exception(_LE('Unable to create quiesced VM snapshot, '
'attempting again with quiescing disabled.'),
instance=instance)
try:
guest.snapshot(snapshot, no_metadata=True, disk_only=True,
reuse_ext=True, quiesce=False)
except libvirt.libvirtError:
LOG.exception(_LE('Unable to create VM snapshot, '
'failing volume_snapshot operation.'),
instance=instance)
raise
def _volume_refresh_connection_info(self, context, instance, volume_id):
bdm = objects.BlockDeviceMapping.get_by_volume_and_instance(
context, volume_id, instance.uuid)
driver_bdm = driver_block_device.convert_volume(bdm)
if driver_bdm:
driver_bdm.refresh_connection_info(context, instance,
self._volume_api, self)
def volume_snapshot_create(self, context, instance, volume_id,
create_info):
"""Create snapshots of a Cinder volume via libvirt.
:param instance: VM instance object reference
:param volume_id: id of volume being snapshotted
:param create_info: dict of information used to create snapshots
- snapshot_id : ID of snapshot
- type : qcow2 / <other>
- new_file : qcow2 file created by Cinder which
becomes the VM's active image after
the snapshot is complete
"""
LOG.debug("volume_snapshot_create: create_info: %(c_info)s",
{'c_info': create_info}, instance=instance)
try:
guest = self._host.get_guest(instance)
except exception.InstanceNotFound:
raise exception.InstanceNotRunning(instance_id=instance.uuid)
if create_info['type'] != 'qcow2':
raise exception.NovaException(_('Unknown type: %s') %
create_info['type'])
snapshot_id = create_info.get('snapshot_id', None)
if snapshot_id is None:
raise exception.NovaException(_('snapshot_id required '
'in create_info'))
try:
self._volume_snapshot_create(context, instance, guest,
volume_id, create_info['new_file'])
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_LE('Error occurred during '
'volume_snapshot_create, '
'sending error status to Cinder.'),
instance=instance)
self._volume_snapshot_update_status(
context, snapshot_id, 'error')
self._volume_snapshot_update_status(
context, snapshot_id, 'creating')
def _wait_for_snapshot():
snapshot = self._volume_api.get_snapshot(context, snapshot_id)
if snapshot.get('status') != 'creating':
self._volume_refresh_connection_info(context, instance,
volume_id)
raise loopingcall.LoopingCallDone()
timer = loopingcall.FixedIntervalLoopingCall(_wait_for_snapshot)
timer.start(interval=0.5).wait()
@staticmethod
def _rebase_with_qemu_img(guest, device, active_disk_object,
rebase_base):
"""Rebase a device tied to a guest using qemu-img.
:param guest:the Guest which owns the device being rebased
:type guest: nova.virt.libvirt.guest.Guest
:param device: the guest block device to rebase
:type device: nova.virt.libvirt.guest.BlockDevice
:param active_disk_object: the guest block device to rebase
:type active_disk_object: nova.virt.libvirt.config.\
LibvirtConfigGuestDisk
:param rebase_base: the new parent in the backing chain
:type rebase_base: None or string
"""
# It's unsure how well qemu-img handles network disks for
# every protocol. So let's be safe.
active_protocol = active_disk_object.source_protocol
if active_protocol is not None:
msg = _("Something went wrong when deleting a volume snapshot: "
"rebasing a %(protocol)s network disk using qemu-img "
"has not been fully tested") % {'protocol':
active_protocol}
LOG.error(msg)
raise exception.NovaException(msg)
if rebase_base is None:
# If backing_file is specified as "" (the empty string), then
# the image is rebased onto no backing file (i.e. it will exist
# independently of any backing file).
backing_file = ""
qemu_img_extra_arg = []
else:
# If the rebased image is going to have a backing file then
# explicitly set the backing file format to avoid any security
# concerns related to file format auto detection.
backing_file = rebase_base
b_file_fmt = images.qemu_img_info(backing_file).file_format
qemu_img_extra_arg = ['-F', b_file_fmt]
qemu_img_extra_arg.append(active_disk_object.source_path)
utils.execute("qemu-img", "rebase", "-b", backing_file,
*qemu_img_extra_arg)
def _volume_snapshot_delete(self, context, instance, volume_id,
snapshot_id, delete_info=None):
"""Note:
if file being merged into == active image:
do a blockRebase (pull) operation
else:
do a blockCommit operation
Files must be adjacent in snap chain.
:param instance: instance object reference
:param volume_id: volume UUID
:param snapshot_id: snapshot UUID (unused currently)
:param delete_info: {
'type': 'qcow2',
'file_to_merge': 'a.img',
'merge_target_file': 'b.img' or None (if merging file_to_merge into
active image)
}
Libvirt blockjob handling required for this method is broken
in versions of libvirt that do not contain:
http://libvirt.org/git/?p=libvirt.git;h=0f9e67bfad (1.1.1)
(Patch is pending in 1.0.5-maint branch as well, but we cannot detect
libvirt 1.0.5.5 vs. 1.0.5.6 here.)
"""
if not self._host.has_min_version(MIN_LIBVIRT_BLOCKJOBINFO_VERSION):
ver = '.'.join([str(x) for x in MIN_LIBVIRT_BLOCKJOBINFO_VERSION])
msg = _("Libvirt '%s' or later is required for online deletion "
"of volume snapshots.") % ver
raise exception.Invalid(msg)
LOG.debug('volume_snapshot_delete: delete_info: %s', delete_info,
instance=instance)
if delete_info['type'] != 'qcow2':
msg = _('Unknown delete_info type %s') % delete_info['type']
raise exception.NovaException(msg)
try:
guest = self._host.get_guest(instance)
except exception.InstanceNotFound:
raise exception.InstanceNotRunning(instance_id=instance.uuid)
# Find dev name
my_dev = None
active_disk = None
xml = guest.get_xml_desc()
xml_doc = etree.fromstring(xml)
device_info = vconfig.LibvirtConfigGuest()
device_info.parse_dom(xml_doc)
active_disk_object = None
for guest_disk in device_info.devices:
if (guest_disk.root_name != 'disk'):
continue
if (guest_disk.target_dev is None or guest_disk.serial is None):
continue
if guest_disk.serial == volume_id:
my_dev = guest_disk.target_dev
active_disk = guest_disk.source_path
active_protocol = guest_disk.source_protocol
active_disk_object = guest_disk
break
if my_dev is None or (active_disk is None and active_protocol is None):
msg = _('Disk with id: %s '
'not found attached to instance.') % volume_id
LOG.debug('Domain XML: %s', xml, instance=instance)
raise exception.NovaException(msg)
LOG.debug("found device at %s", my_dev, instance=instance)
def _get_snap_dev(filename, backing_store):
if filename is None:
msg = _('filename cannot be None')
raise exception.NovaException(msg)
# libgfapi delete
LOG.debug("XML: %s" % xml)
LOG.debug("active disk object: %s", active_disk_object)
# determine reference within backing store for desired image
filename_to_merge = filename
matched_name = None
b = backing_store
index = None
current_filename = active_disk_object.source_name.split('/')[1]
if current_filename == filename_to_merge:
return my_dev + '[0]'
while b is not None:
source_filename = b.source_name.split('/')[1]
if source_filename == filename_to_merge:
LOG.debug('found match: %s', b.source_name)
matched_name = b.source_name
index = b.index
break
b = b.backing_store
if matched_name is None:
msg = _('no match found for %s') % (filename_to_merge)
raise exception.NovaException(msg)
LOG.debug('index of match (%s) is %s', b.source_name, index)
my_snap_dev = '%s[%s]' % (my_dev, index)
return my_snap_dev
if delete_info['merge_target_file'] is None:
# pull via blockRebase()
# Merge the most recent snapshot into the active image
rebase_disk = my_dev
rebase_base = delete_info['file_to_merge'] # often None
if (active_protocol is not None) and (rebase_base is not None):
rebase_base = _get_snap_dev(rebase_base,
active_disk_object.backing_store)
# NOTE(deepakcs): libvirt added support for _RELATIVE in v1.2.7,
# and when available this flag _must_ be used to ensure backing
# paths are maintained relative by qemu.
#
# If _RELATIVE flag not found, continue with old behaviour
# (relative backing path seems to work for this case)
try:
libvirt.VIR_DOMAIN_BLOCK_REBASE_RELATIVE
relative = rebase_base is not None
except AttributeError:
LOG.warn(_LW("Relative blockrebase support was not detected. "
"Continuing with old behaviour."))
relative = False
LOG.debug(
'disk: %(disk)s, base: %(base)s, '
'bw: %(bw)s, relative: %(relative)s',
{'disk': rebase_disk,
'base': rebase_base,
'bw': libvirt_guest.BlockDevice.REBASE_DEFAULT_BANDWIDTH,
'relative': str(relative)}, instance=instance)
dev = guest.get_block_device(rebase_disk)
if guest.is_active():
result = dev.rebase(rebase_base, relative=relative)
if result == 0:
LOG.debug('blockRebase started successfully',
instance=instance)
while dev.wait_for_job(abort_on_error=True):
LOG.debug('waiting for blockRebase job completion',
instance=instance)
time.sleep(0.5)
# If the guest is not running libvirt won't do a blockRebase.
# In that case, let's ask qemu-img to rebase the disk.
else:
LOG.debug('Guest is not running so doing a block rebase '
'using "qemu-img rebase"', instance=instance)
self._rebase_with_qemu_img(guest, dev, active_disk_object,
rebase_base)
else:
# commit with blockCommit()
my_snap_base = None
my_snap_top = None
commit_disk = my_dev
# NOTE(deepakcs): libvirt added support for _RELATIVE in v1.2.7,
# and when available this flag _must_ be used to ensure backing
# paths are maintained relative by qemu.
#
# If _RELATIVE flag not found, raise exception as relative backing
# path may not be maintained and Cinder flow is broken if allowed
# to continue.
try:
libvirt.VIR_DOMAIN_BLOCK_COMMIT_RELATIVE
except AttributeError:
ver = '.'.join(
[str(x) for x in
MIN_LIBVIRT_BLOCKJOB_RELATIVE_VERSION])
msg = _("Relative blockcommit support was not detected. "
"Libvirt '%s' or later is required for online "
"deletion of file/network storage-backed volume "
"snapshots.") % ver
raise exception.Invalid(msg)
if active_protocol is not None:
my_snap_base = _get_snap_dev(delete_info['merge_target_file'],
active_disk_object.backing_store)
my_snap_top = _get_snap_dev(delete_info['file_to_merge'],
active_disk_object.backing_store)
commit_base = my_snap_base or delete_info['merge_target_file']
commit_top = my_snap_top or delete_info['file_to_merge']
LOG.debug('will call blockCommit with commit_disk=%(commit_disk)s '
'commit_base=%(commit_base)s '
'commit_top=%(commit_top)s ',
{'commit_disk': commit_disk,
'commit_base': commit_base,
'commit_top': commit_top}, instance=instance)
dev = guest.get_block_device(commit_disk)
result = dev.commit(commit_base, commit_top, relative=True)
if result == 0:
LOG.debug('blockCommit started successfully',
instance=instance)
while dev.wait_for_job(abort_on_error=True):
LOG.debug('waiting for blockCommit job completion',
instance=instance)
time.sleep(0.5)
def volume_snapshot_delete(self, context, instance, volume_id, snapshot_id,
delete_info):
try:
self._volume_snapshot_delete(context, instance, volume_id,
snapshot_id, delete_info=delete_info)
except Exception:
with excutils.save_and_reraise_exception():
LOG.exception(_LE('Error occurred during '
'volume_snapshot_delete, '
'sending error status to Cinder.'),
instance=instance)
self._volume_snapshot_update_status(
context, snapshot_id, 'error_deleting')
self._volume_snapshot_update_status(context, snapshot_id, 'deleting')
self._volume_refresh_connection_info(context, instance, volume_id)
def reboot(self, context, instance, network_info, reboot_type,
block_device_info=None, bad_volumes_callback=None):
"""Reboot a virtual machine, given an instance reference."""
if reboot_type == 'SOFT':
# NOTE(vish): This will attempt to do a graceful shutdown/restart.
try:
soft_reboot_success = self._soft_reboot(instance)
except libvirt.libvirtError as e:
LOG.debug("Instance soft reboot failed: %s", e,
instance=instance)
soft_reboot_success = False
if soft_reboot_success:
LOG.info(_LI("Instance soft rebooted successfully."),
instance=instance)
return
else:
LOG.warn(_LW("Failed to soft reboot instance. "
"Trying hard reboot."),
instance=instance)
return self._hard_reboot(context, instance, network_info,
block_device_info)
def _soft_reboot(self, instance):
"""Attempt to shutdown and restart the instance gracefully.
We use shutdown and create here so we can return if the guest
responded and actually rebooted. Note that this method only
succeeds if the guest responds to acpi. Therefore we return
success or failure so we can fall back to a hard reboot if
necessary.
:returns: True if the reboot succeeded
"""
guest = self._host.get_guest(instance)
state = guest.get_power_state(self._host)
old_domid = guest.id
# NOTE(vish): This check allows us to reboot an instance that
# is already shutdown.
if state == power_state.RUNNING:
guest.shutdown()
# NOTE(vish): This actually could take slightly longer than the
# FLAG defines depending on how long the get_info
# call takes to return.
self._prepare_pci_devices_for_use(
pci_manager.get_instance_pci_devs(instance, 'all'))
for x in range(CONF.libvirt.wait_soft_reboot_seconds):
guest = self._host.get_guest(instance)
state = guest.get_power_state(self._host)
new_domid = guest.id
# NOTE(ivoks): By checking domain IDs, we make sure we are
# not recreating domain that's already running.
if old_domid != new_domid:
if state in [power_state.SHUTDOWN,
power_state.CRASHED]:
LOG.info(_LI("Instance shutdown successfully."),
instance=instance)
self._create_domain(domain=guest._domain)
timer = loopingcall.FixedIntervalLoopingCall(
self._wait_for_running, instance)
timer.start(interval=0.5).wait()
return True
else:
LOG.info(_LI("Instance may have been rebooted during soft "
"reboot, so return now."), instance=instance)
return True
greenthread.sleep(1)
return False
def _hard_reboot(self, context, instance, network_info,
block_device_info=None):
"""Reboot a virtual machine, given an instance reference.
Performs a Libvirt reset (if supported) on the domain.
If Libvirt reset is unavailable this method actually destroys and
re-creates the domain to ensure the reboot happens, as the guest
OS cannot ignore this action.
"""
self._destroy(instance)
# Convert the system metadata to image metadata
instance_dir = libvirt_utils.get_instance_path(instance)
fileutils.ensure_tree(instance_dir)
disk_info = blockinfo.get_disk_info(CONF.libvirt.virt_type,
instance,
instance.image_meta,
block_device_info)
# NOTE(vish): This could generate the wrong device_format if we are
# using the raw backend and the images don't exist yet.
# The create_images_and_backing below doesn't properly
# regenerate raw backend images, however, so when it
# does we need to (re)generate the xml after the images
# are in place.
xml = self._get_guest_xml(context, instance, network_info, disk_info,
instance.image_meta,
block_device_info=block_device_info,
write_to_disk=True)
if context.auth_token is not None:
# NOTE (rmk): Re-populate any missing backing files.
backing_disk_info = self._get_instance_disk_info(instance.name,
xml,
block_device_info)
self._create_images_and_backing(context, instance, instance_dir,
backing_disk_info)
# Initialize all the necessary networking, block devices and
# start the instance.
self._create_domain_and_network(context, xml, instance, network_info,
disk_info,
block_device_info=block_device_info,
reboot=True,
vifs_already_plugged=True)
self._prepare_pci_devices_for_use(
pci_manager.get_instance_pci_devs(instance, 'all'))
def _wait_for_reboot():
"""Called at an interval until the VM is running again."""
state = self.get_info(instance).state
if state == power_state.RUNNING:
LOG.info(_LI("Instance rebooted successfully."),
instance=instance)
raise loopingcall.LoopingCallDone()
timer = loopingcall.FixedIntervalLoopingCall(_wait_for_reboot)
timer.start(interval=0.5).wait()
def pause(self, instance):
"""Pause VM instance."""
self._host.get_guest(instance).pause()
def unpause(self, instance):
"""Unpause paused VM instance."""
self._host.get_guest(instance).resume()
def _clean_shutdown(self, instance, timeout, retry_interval):
"""Attempt to shutdown the instance gracefully.
:param instance: The instance to be shutdown
:param timeout: How long to wait in seconds for the instance to
shutdown
:param retry_interval: How often in seconds to signal the instance
to shutdown while waiting
:returns: True if the shutdown succeeded
"""
# List of states that represent a shutdown instance
SHUTDOWN_STATES = [power_state.SHUTDOWN,
power_state.CRASHED]
try:
guest = self._host.get_guest(instance)
except exception.InstanceNotFound:
# If the instance has gone then we don't need to
# wait for it to shutdown
return True
state = guest.get_power_state(self._host)
if state in SHUTDOWN_STATES:
LOG.info(_LI("Instance already shutdown."),
instance=instance)
return True
LOG.debug("Shutting down instance from state %s", state,
instance=instance)
guest.shutdown()
retry_countdown = retry_interval
for sec in six.moves.range(timeout):
guest = self._host.get_guest(instance)
state = guest.get_power_state(self._host)
if state in SHUTDOWN_STATES:
LOG.info(_LI("Instance shutdown successfully after %d "
"seconds."), sec, instance=instance)
return True
# Note(PhilD): We can't assume that the Guest was able to process
# any previous shutdown signal (for example it may
# have still been startingup, so within the overall
# timeout we re-trigger the shutdown every
# retry_interval
if retry_countdown == 0:
retry_countdown = retry_interval
# Instance could shutdown at any time, in which case we
# will get an exception when we call shutdown
try:
LOG.debug("Instance in state %s after %d seconds - "
"resending shutdown", state, sec,
instance=instance)
guest.shutdown()
except libvirt.libvirtError:
# Assume this is because its now shutdown, so loop
# one more time to clean up.
LOG.debug("Ignoring libvirt exception from shutdown "
"request.", instance=instance)
continue
else:
retry_countdown -= 1
time.sleep(1)
LOG.info(_LI("Instance failed to shutdown in %d seconds."),
timeout, instance=instance)
return False
def power_off(self, instance, timeout=0, retry_interval=0):
"""Power off the specified instance."""
if timeout:
self._clean_shutdown(instance, timeout, retry_interval)
self._destroy(instance)
def power_on(self, context, instance, network_info,
block_device_info=None):
"""Power on the specified instance."""
# We use _hard_reboot here to ensure that all backing files,
# network, and block device connections, etc. are established
# and available before we attempt to start the instance.
self._hard_reboot(context, instance, network_info, block_device_info)
def inject_nmi(self, instance):
"""Inject an NMI to the specified instance."""
try:
self._host.get_guest(instance).inject_nmi()
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
if error_code == libvirt.VIR_ERR_NO_SUPPORT:
raise exception.NMINotSupported()
elif error_code == libvirt.VIR_ERR_OPERATION_INVALID:
raise exception.InstanceNotRunning(instance_id=instance.uuid)
LOG.exception(_LE('Error from libvirt while injecting an NMI to '
'%(instance_uuid)s: '
'[Error Code %(error_code)s] %(ex)s'),
{'instance_uuid': instance.uuid,
'error_code': error_code, 'ex': ex})
raise
def suspend(self, context, instance):
"""Suspend the specified instance."""
guest = self._host.get_guest(instance)
self._detach_pci_devices(guest,
pci_manager.get_instance_pci_devs(instance))
self._detach_sriov_ports(context, instance, guest)
guest.save_memory_state()
def resume(self, context, instance, network_info, block_device_info=None):
"""resume the specified instance."""
disk_info = blockinfo.get_disk_info(
CONF.libvirt.virt_type, instance, instance.image_meta,
block_device_info=block_device_info)
xml = self._get_existing_domain_xml(instance, network_info,
block_device_info)
guest = self._create_domain_and_network(context, xml, instance,
network_info, disk_info,
block_device_info=block_device_info,
vifs_already_plugged=True)
self._attach_pci_devices(guest,
pci_manager.get_instance_pci_devs(instance))
self._attach_sriov_ports(context, instance, guest, network_info)
def resume_state_on_host_boot(self, context, instance, network_info,
block_device_info=None):
"""resume guest state when a host is booted."""
# Check if the instance is running already and avoid doing
# anything if it is.
try:
guest = self._host.get_guest(instance)
state = guest.get_power_state(self._host)
ignored_states = (power_state.RUNNING,
power_state.SUSPENDED,
power_state.NOSTATE,
power_state.PAUSED)
if state in ignored_states:
return
except exception.NovaException:
pass
# Instance is not up and could be in an unknown state.
# Be as absolute as possible about getting it back into
# a known and running state.
self._hard_reboot(context, instance, network_info, block_device_info)
def rescue(self, context, instance, network_info, image_meta,
rescue_password):
"""Loads a VM using rescue images.
A rescue is normally performed when something goes wrong with the
primary images and data needs to be corrected/recovered. Rescuing
should not edit or over-ride the original image, only allow for
data recovery.
"""
instance_dir = libvirt_utils.get_instance_path(instance)
unrescue_xml = self._get_existing_domain_xml(instance, network_info)
unrescue_xml_path = os.path.join(instance_dir, 'unrescue.xml')
libvirt_utils.write_to_file(unrescue_xml_path, unrescue_xml)
rescue_image_id = None
if image_meta.obj_attr_is_set("id"):
rescue_image_id = image_meta.id
rescue_images = {
'image_id': (rescue_image_id or
CONF.libvirt.rescue_image_id or instance.image_ref),
'kernel_id': (CONF.libvirt.rescue_kernel_id or
instance.kernel_id),
'ramdisk_id': (CONF.libvirt.rescue_ramdisk_id or
instance.ramdisk_id),
}
disk_info = blockinfo.get_disk_info(CONF.libvirt.virt_type,
instance,
image_meta,
rescue=True)
self._create_image(context, instance, disk_info['mapping'],
suffix='.rescue', disk_images=rescue_images,
network_info=network_info,
admin_pass=rescue_password)
xml = self._get_guest_xml(context, instance, network_info, disk_info,
image_meta, rescue=rescue_images,
write_to_disk=True)
self._destroy(instance)
self._create_domain(xml)
def unrescue(self, instance, network_info):
"""Reboot the VM which is being rescued back into primary images.
"""
instance_dir = libvirt_utils.get_instance_path(instance)
unrescue_xml_path = os.path.join(instance_dir, 'unrescue.xml')
xml = libvirt_utils.load_file(unrescue_xml_path)
guest = self._host.get_guest(instance)
# TODO(sahid): We are converting all calls from a
# virDomain object to use nova.virt.libvirt.Guest.
# We should be able to remove virt_dom at the end.
virt_dom = guest._domain
self._destroy(instance)
self._create_domain(xml, virt_dom)
libvirt_utils.file_delete(unrescue_xml_path)
rescue_files = os.path.join(instance_dir, "*.rescue")
for rescue_file in glob.iglob(rescue_files):
libvirt_utils.file_delete(rescue_file)
# cleanup rescue volume
lvm.remove_volumes([lvmdisk for lvmdisk in self._lvm_disks(instance)
if lvmdisk.endswith('.rescue')])
def poll_rebooting_instances(self, timeout, instances):
pass
# NOTE(ilyaalekseyev): Implementation like in multinics
# for xenapi(tr3buchet)
def spawn(self, context, instance, image_meta, injected_files,
admin_password, network_info=None, block_device_info=None):
disk_info = blockinfo.get_disk_info(CONF.libvirt.virt_type,
instance,
image_meta,
block_device_info)
self._create_image(context, instance,
disk_info['mapping'],
network_info=network_info,
block_device_info=block_device_info,
files=injected_files,
admin_pass=admin_password)
xml = self._get_guest_xml(context, instance, network_info,
disk_info, image_meta,
block_device_info=block_device_info,
write_to_disk=True)
self._create_domain_and_network(context, xml, instance, network_info,
disk_info,
block_device_info=block_device_info)
LOG.debug("Instance is running", instance=instance)
def _wait_for_boot():
"""Called at an interval until the VM is running."""
state = self.get_info(instance).state
if state == power_state.RUNNING:
LOG.info(_LI("Instance spawned successfully."),
instance=instance)
raise loopingcall.LoopingCallDone()
timer = loopingcall.FixedIntervalLoopingCall(_wait_for_boot)
timer.start(interval=0.5).wait()
def _flush_libvirt_console(self, pty):
out, err = utils.execute('dd',
'if=%s' % pty,
'iflag=nonblock',
run_as_root=True,
check_exit_code=False)
return out
def _append_to_file(self, data, fpath):
LOG.info(_LI('data: %(data)r, fpath: %(fpath)r'),
{'data': data, 'fpath': fpath})
with open(fpath, 'a+') as fp:
fp.write(data)
return fpath
def get_console_output(self, context, instance):
guest = self._host.get_guest(instance)
xml = guest.get_xml_desc()
tree = etree.fromstring(xml)
console_types = {}
# NOTE(comstud): We want to try 'file' types first, then try 'pty'
# types. We can't use Python 2.7 syntax of:
# tree.find("./devices/console[@type='file']/source")
# because we need to support 2.6.
console_nodes = tree.findall('./devices/console')
for console_node in console_nodes:
console_type = console_node.get('type')
console_types.setdefault(console_type, [])
console_types[console_type].append(console_node)
# If the guest has a console logging to a file prefer to use that
if console_types.get('file'):
for file_console in console_types.get('file'):
source_node = file_console.find('./source')
if source_node is None:
continue
path = source_node.get("path")
if not path:
continue
if not os.path.exists(path):
LOG.info(_LI('Instance is configured with a file console, '
'but the backing file is not (yet?) present'),
instance=instance)
return ""
libvirt_utils.chown(path, os.getuid())
with libvirt_utils.file_open(path, 'rb') as fp:
log_data, remaining = utils.last_bytes(fp,
MAX_CONSOLE_BYTES)
if remaining > 0:
LOG.info(_LI('Truncated console log returned, '
'%d bytes ignored'), remaining,
instance=instance)
return log_data
# Try 'pty' types
if console_types.get('pty'):
for pty_console in console_types.get('pty'):
source_node = pty_console.find('./source')
if source_node is None:
continue
pty = source_node.get("path")
if not pty:
continue
break
else:
msg = _("Guest does not have a console available")
raise exception.NovaException(msg)
self._chown_console_log_for_instance(instance)
data = self._flush_libvirt_console(pty)
console_log = self._get_console_log_path(instance)
fpath = self._append_to_file(data, console_log)
with libvirt_utils.file_open(fpath, 'rb') as fp:
log_data, remaining = utils.last_bytes(fp, MAX_CONSOLE_BYTES)
if remaining > 0:
LOG.info(_LI('Truncated console log returned, '
'%d bytes ignored'),
remaining, instance=instance)
return log_data
def get_host_ip_addr(self):
ips = compute_utils.get_machine_ips()
if CONF.my_ip not in ips:
LOG.warn(_LW('my_ip address (%(my_ip)s) was not found on '
'any of the interfaces: %(ifaces)s'),
{'my_ip': CONF.my_ip, 'ifaces': ", ".join(ips)})
return CONF.my_ip
def get_vnc_console(self, context, instance):
def get_vnc_port_for_instance(instance_name):
guest = self._host.get_guest(instance)
xml = guest.get_xml_desc()
xml_dom = etree.fromstring(xml)
graphic = xml_dom.find("./devices/graphics[@type='vnc']")
if graphic is not None:
return graphic.get('port')
# NOTE(rmk): We had VNC consoles enabled but the instance in
# question is not actually listening for connections.
raise exception.ConsoleTypeUnavailable(console_type='vnc')
port = get_vnc_port_for_instance(instance.name)
host = CONF.vnc.vncserver_proxyclient_address
return ctype.ConsoleVNC(host=host, port=port)
def get_spice_console(self, context, instance):
def get_spice_ports_for_instance(instance_name):
guest = self._host.get_guest(instance)
xml = guest.get_xml_desc()
xml_dom = etree.fromstring(xml)
graphic = xml_dom.find("./devices/graphics[@type='spice']")
if graphic is not None:
return (graphic.get('port'), graphic.get('tlsPort'))
# NOTE(rmk): We had Spice consoles enabled but the instance in
# question is not actually listening for connections.
raise exception.ConsoleTypeUnavailable(console_type='spice')
ports = get_spice_ports_for_instance(instance.name)
host = CONF.spice.server_proxyclient_address
return ctype.ConsoleSpice(host=host, port=ports[0], tlsPort=ports[1])
def get_serial_console(self, context, instance):
guest = self._host.get_guest(instance)
for hostname, port in self._get_serial_ports_from_guest(
guest, mode='bind'):
return ctype.ConsoleSerial(host=hostname, port=port)
raise exception.ConsoleTypeUnavailable(console_type='serial')
@staticmethod
def _supports_direct_io(dirpath):
if not hasattr(os, 'O_DIRECT'):
LOG.debug("This python runtime does not support direct I/O")
return False
testfile = os.path.join(dirpath, ".directio.test")
hasDirectIO = True
try:
f = os.open(testfile, os.O_CREAT | os.O_WRONLY | os.O_DIRECT)
# Check is the write allowed with 512 byte alignment
align_size = 512
m = mmap.mmap(-1, align_size)
m.write(r"x" * align_size)
os.write(f, m)
os.close(f)
LOG.debug("Path '%(path)s' supports direct I/O",
{'path': dirpath})
except OSError as e:
if e.errno == errno.EINVAL:
LOG.debug("Path '%(path)s' does not support direct I/O: "
"'%(ex)s'", {'path': dirpath, 'ex': e})
hasDirectIO = False
else:
with excutils.save_and_reraise_exception():
LOG.error(_LE("Error on '%(path)s' while checking "
"direct I/O: '%(ex)s'"),
{'path': dirpath, 'ex': e})
except Exception as e:
with excutils.save_and_reraise_exception():
LOG.error(_LE("Error on '%(path)s' while checking direct I/O: "
"'%(ex)s'"), {'path': dirpath, 'ex': e})
finally:
try:
os.unlink(testfile)
except Exception:
pass
return hasDirectIO
@staticmethod
def _create_ephemeral(target, ephemeral_size,
fs_label, os_type, is_block_dev=False,
max_size=None, context=None, specified_fs=None):
if not is_block_dev:
libvirt_utils.create_image('raw', target, '%dG' % ephemeral_size)
# Run as root only for block devices.
disk.mkfs(os_type, fs_label, target, run_as_root=is_block_dev,
specified_fs=specified_fs)
@staticmethod
def _create_swap(target, swap_mb, max_size=None, context=None):
"""Create a swap file of specified size."""
libvirt_utils.create_image('raw', target, '%dM' % swap_mb)
utils.mkfs('swap', target)
@staticmethod
def _get_console_log_path(instance):
return os.path.join(libvirt_utils.get_instance_path(instance),
'console.log')
@staticmethod
def _get_disk_config_path(instance, suffix=''):
return os.path.join(libvirt_utils.get_instance_path(instance),
'disk.config' + suffix)
@staticmethod
def _get_disk_config_image_type():
# TODO(mikal): there is a bug here if images_type has
# changed since creation of the instance, but I am pretty
# sure that this bug already exists.
return 'rbd' if CONF.libvirt.images_type == 'rbd' else 'raw'
def _chown_console_log_for_instance(self, instance):
console_log = self._get_console_log_path(instance)
if os.path.exists(console_log):
libvirt_utils.chown(console_log, os.getuid())
def _chown_disk_config_for_instance(self, instance):
disk_config = self._get_disk_config_path(instance)
if os.path.exists(disk_config):
libvirt_utils.chown(disk_config, os.getuid())
@staticmethod
def _is_booted_from_volume(instance, disk_mapping):
"""Determines whether the VM is booting from volume
Determines whether the disk mapping indicates that the VM
is booting from a volume.
"""
return ((not bool(instance.get('image_ref')))
or 'disk' not in disk_mapping)
@staticmethod
def _has_local_disk(instance, disk_mapping):
"""Determines whether the VM has a local disk
Determines whether the disk mapping indicates that the VM
has a local disk (e.g. ephemeral, swap disk and config-drive).
"""
if disk_mapping:
if ('disk.local' in disk_mapping or
'disk.swap' in disk_mapping or
'disk.config' in disk_mapping):
return True
return False
def _inject_data(self, instance, network_info, admin_pass, files, suffix):
"""Injects data in a disk image
Helper used for injecting data in a disk image file system.
Keyword arguments:
instance -- a dict that refers instance specifications
network_info -- a dict that refers network speficications
admin_pass -- a string used to set an admin password
files -- a list of files needs to be injected
suffix -- a string used as an image name suffix
"""
# Handles the partition need to be used.
target_partition = None
if not instance.kernel_id:
target_partition = CONF.libvirt.inject_partition
if target_partition == 0:
target_partition = None
if CONF.libvirt.virt_type == 'lxc':
target_partition = None
# Handles the key injection.
if CONF.libvirt.inject_key and instance.get('key_data'):
key = str(instance.key_data)
else:
key = None
# Handles the admin password injection.
if not CONF.libvirt.inject_password:
admin_pass = None
# Handles the network injection.
net = netutils.get_injected_network_template(
network_info, libvirt_virt_type=CONF.libvirt.virt_type)
# Handles the metadata injection
metadata = instance.get('metadata')
image_type = CONF.libvirt.images_type
if any((key, net, metadata, admin_pass, files)):
injection_image = self.image_backend.image(
instance,
'disk' + suffix,
image_type)
img_id = instance.image_ref
if not injection_image.check_image_exists():
LOG.warn(_LW('Image %s not found on disk storage. '
'Continue without injecting data'),
injection_image.path, instance=instance)
return
try:
disk.inject_data(injection_image.get_model(self._conn),
key, net, metadata, admin_pass, files,
partition=target_partition,
mandatory=('files',))
except Exception as e:
with excutils.save_and_reraise_exception():
LOG.error(_LE('Error injecting data into image '
'%(img_id)s (%(e)s)'),
{'img_id': img_id, 'e': e},
instance=instance)
# NOTE(sileht): many callers of this method assume that this
# method doesn't fail if an image already exists but instead
# think that it will be reused (ie: (live)-migration/resize)
def _create_image(self, context, instance,
disk_mapping, suffix='',
disk_images=None, network_info=None,
block_device_info=None, files=None,
admin_pass=None, inject_files=True,
fallback_from_host=None):
booted_from_volume = self._is_booted_from_volume(
instance, disk_mapping)
def image(fname, image_type=CONF.libvirt.images_type):
return self.image_backend.image(instance,
fname + suffix, image_type)
def raw(fname):
return image(fname, image_type='raw')
# ensure directories exist and are writable
fileutils.ensure_tree(libvirt_utils.get_instance_path(instance))
LOG.info(_LI('Creating image'), instance=instance)
# NOTE(dprince): for rescue console.log may already exist... chown it.
self._chown_console_log_for_instance(instance)
# NOTE(yaguang): For evacuate disk.config already exist in shared
# storage, chown it.
self._chown_disk_config_for_instance(instance)
# NOTE(vish): No need add the suffix to console.log
libvirt_utils.write_to_file(
self._get_console_log_path(instance), '', 7)
if not disk_images:
disk_images = {'image_id': instance.image_ref,
'kernel_id': instance.kernel_id,
'ramdisk_id': instance.ramdisk_id}
if disk_images['kernel_id']:
fname = imagecache.get_cache_fname(disk_images, 'kernel_id')
raw('kernel').cache(fetch_func=libvirt_utils.fetch_raw_image,
context=context,
filename=fname,
image_id=disk_images['kernel_id'],
user_id=instance.user_id,
project_id=instance.project_id)
if disk_images['ramdisk_id']:
fname = imagecache.get_cache_fname(disk_images, 'ramdisk_id')
raw('ramdisk').cache(fetch_func=libvirt_utils.fetch_raw_image,
context=context,
filename=fname,
image_id=disk_images['ramdisk_id'],
user_id=instance.user_id,
project_id=instance.project_id)
inst_type = instance.get_flavor()
# NOTE(ndipanov): Even if disk_mapping was passed in, which
# currently happens only on rescue - we still don't want to
# create a base image.
if not booted_from_volume:
root_fname = imagecache.get_cache_fname(disk_images, 'image_id')
size = instance.root_gb * units.Gi
if size == 0 or suffix == '.rescue':
size = None
backend = image('disk')
if instance.task_state == task_states.RESIZE_FINISH:
backend.create_snap(libvirt_utils.RESIZE_SNAPSHOT_NAME)
if backend.SUPPORTS_CLONE:
def clone_fallback_to_fetch(*args, **kwargs):
try:
backend.clone(context, disk_images['image_id'])
except exception.ImageUnacceptable:
libvirt_utils.fetch_image(*args, **kwargs)
fetch_func = clone_fallback_to_fetch
else:
fetch_func = libvirt_utils.fetch_image
self._try_fetch_image_cache(backend, fetch_func, context,
root_fname, disk_images['image_id'],
instance, size, fallback_from_host)
# Lookup the filesystem type if required
os_type_with_default = disk.get_fs_type_for_os_type(instance.os_type)
# Generate a file extension based on the file system
# type and the mkfs commands configured if any
file_extension = disk.get_file_extension_for_os_type(
os_type_with_default)
ephemeral_gb = instance.ephemeral_gb
if 'disk.local' in disk_mapping:
disk_image = image('disk.local')
fn = functools.partial(self._create_ephemeral,
fs_label='ephemeral0',
os_type=instance.os_type,
is_block_dev=disk_image.is_block_dev)
fname = "ephemeral_%s_%s" % (ephemeral_gb, file_extension)
size = ephemeral_gb * units.Gi
disk_image.cache(fetch_func=fn,
context=context,
filename=fname,
size=size,
ephemeral_size=ephemeral_gb)
for idx, eph in enumerate(driver.block_device_info_get_ephemerals(
block_device_info)):
disk_image = image(blockinfo.get_eph_disk(idx))
specified_fs = eph.get('guest_format')
if specified_fs and not self.is_supported_fs_format(specified_fs):
msg = _("%s format is not supported") % specified_fs
raise exception.InvalidBDMFormat(details=msg)
fn = functools.partial(self._create_ephemeral,
fs_label='ephemeral%d' % idx,
os_type=instance.os_type,
is_block_dev=disk_image.is_block_dev)
size = eph['size'] * units.Gi
fname = "ephemeral_%s_%s" % (eph['size'], file_extension)
disk_image.cache(fetch_func=fn,
context=context,
filename=fname,
size=size,
ephemeral_size=eph['size'],
specified_fs=specified_fs)
if 'disk.swap' in disk_mapping:
mapping = disk_mapping['disk.swap']
swap_mb = 0
swap = driver.block_device_info_get_swap(block_device_info)
if driver.swap_is_usable(swap):
swap_mb = swap['swap_size']
elif (inst_type['swap'] > 0 and
not block_device.volume_in_mapping(
mapping['dev'], block_device_info)):
swap_mb = inst_type['swap']
if swap_mb > 0:
size = swap_mb * units.Mi
image('disk.swap').cache(fetch_func=self._create_swap,
context=context,
filename="swap_%s" % swap_mb,
size=size,
swap_mb=swap_mb)
# Config drive
if configdrive.required_by(instance):
LOG.info(_LI('Using config drive'), instance=instance)
extra_md = {}
if admin_pass:
extra_md['admin_pass'] = admin_pass
inst_md = instance_metadata.InstanceMetadata(instance,
content=files, extra_md=extra_md, network_info=network_info)
with configdrive.ConfigDriveBuilder(instance_md=inst_md) as cdb:
configdrive_path = self._get_disk_config_path(instance, suffix)
LOG.info(_LI('Creating config drive at %(path)s'),
{'path': configdrive_path}, instance=instance)
try:
cdb.make_drive(configdrive_path)
except processutils.ProcessExecutionError as e:
with excutils.save_and_reraise_exception():
LOG.error(_LE('Creating config drive failed '
'with error: %s'),
e, instance=instance)
try:
# Tell the storage backend about the config drive
config_drive_image = self.image_backend.image(
instance, 'disk.config' + suffix,
self._get_disk_config_image_type())
config_drive_image.import_file(
instance, configdrive_path, 'disk.config' + suffix)
finally:
# NOTE(mikal): if the config drive was imported into RBD, then
# we no longer need the local copy
if CONF.libvirt.images_type == 'rbd':
os.unlink(configdrive_path)
# File injection only if needed
elif inject_files and CONF.libvirt.inject_partition != -2:
if booted_from_volume:
LOG.warn(_LW('File injection into a boot from volume '
'instance is not supported'), instance=instance)
self._inject_data(
instance, network_info, admin_pass, files, suffix)
if CONF.libvirt.virt_type == 'uml':
libvirt_utils.chown(image('disk').path, 'root')
def _prepare_pci_devices_for_use(self, pci_devices):
# kvm , qemu support managed mode
# In managed mode, the configured device will be automatically
# detached from the host OS drivers when the guest is started,
# and then re-attached when the guest shuts down.
if CONF.libvirt.virt_type != 'xen':
# we do manual detach only for xen
return
try:
for dev in pci_devices:
libvirt_dev_addr = dev['hypervisor_name']
libvirt_dev = \
self._host.device_lookup_by_name(libvirt_dev_addr)
# Note(yjiang5) Spelling for 'dettach' is correct, see
# http://libvirt.org/html/libvirt-libvirt.html.
libvirt_dev.dettach()
# Note(yjiang5): A reset of one PCI device may impact other
# devices on the same bus, thus we need two separated loops
# to detach and then reset it.
for dev in pci_devices:
libvirt_dev_addr = dev['hypervisor_name']
libvirt_dev = \
self._host.device_lookup_by_name(libvirt_dev_addr)
libvirt_dev.reset()
except libvirt.libvirtError as exc:
raise exception.PciDevicePrepareFailed(id=dev['id'],
instance_uuid=
dev['instance_uuid'],
reason=six.text_type(exc))
def _detach_pci_devices(self, guest, pci_devs):
# for libvirt version < 1.1.1, this is race condition
# so forbid detach if not had this version
if not self._host.has_min_version(MIN_LIBVIRT_DEVICE_CALLBACK_VERSION):
if pci_devs:
reason = (_("Detaching PCI devices with libvirt < %(ver)s"
" is not permitted") %
{'ver': MIN_LIBVIRT_DEVICE_CALLBACK_VERSION})
raise exception.PciDeviceDetachFailed(reason=reason,
dev=pci_devs)
try:
for dev in pci_devs:
guest.detach_device(self._get_guest_pci_device(dev), live=True)
# after detachDeviceFlags returned, we should check the dom to
# ensure the detaching is finished
xml = guest.get_xml_desc()
xml_doc = etree.fromstring(xml)
guest_config = vconfig.LibvirtConfigGuest()
guest_config.parse_dom(xml_doc)
for hdev in [d for d in guest_config.devices
if isinstance(d, vconfig.LibvirtConfigGuestHostdevPCI)]:
hdbsf = [hdev.domain, hdev.bus, hdev.slot, hdev.function]
dbsf = pci_utils.parse_address(dev['address'])
if [int(x, 16) for x in hdbsf] ==\
[int(x, 16) for x in dbsf]:
raise exception.PciDeviceDetachFailed(reason=
"timeout",
dev=dev)
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
if error_code == libvirt.VIR_ERR_NO_DOMAIN:
LOG.warn(_LW("Instance disappeared while detaching "
"a PCI device from it."))
else:
raise
def _attach_pci_devices(self, guest, pci_devs):
try:
for dev in pci_devs:
guest.attach_device(self._get_guest_pci_device(dev))
except libvirt.libvirtError:
LOG.error(_LE('Attaching PCI devices %(dev)s to %(dom)s failed.'),
{'dev': pci_devs, 'dom': guest.id})
raise
@staticmethod
def _has_sriov_port(network_info):
for vif in network_info:
if vif['vnic_type'] == network_model.VNIC_TYPE_DIRECT:
return True
return False
def _attach_sriov_ports(self, context, instance, guest, network_info=None):
if network_info is None:
network_info = instance.info_cache.network_info
if network_info is None:
return
if self._has_sriov_port(network_info):
for vif in network_info:
if vif['vnic_type'] == network_model.VNIC_TYPE_DIRECT:
cfg = self.vif_driver.get_config(instance,
vif,
instance.image_meta,
instance.flavor,
CONF.libvirt.virt_type,
self._host)
LOG.debug('Attaching SR-IOV port %(port)s to %(dom)s',
{'port': vif, 'dom': guest.id},
instance=instance)
guest.attach_device(cfg)
def _detach_sriov_ports(self, context, instance, guest):
network_info = instance.info_cache.network_info
if network_info is None:
return
if self._has_sriov_port(network_info):
# for libvirt version < 1.1.1, this is race condition
# so forbid detach if it's an older version
if not self._host.has_min_version(
MIN_LIBVIRT_DEVICE_CALLBACK_VERSION):
reason = (_("Detaching SR-IOV ports with"
" libvirt < %(ver)s is not permitted") %
{'ver': MIN_LIBVIRT_DEVICE_CALLBACK_VERSION})
raise exception.PciDeviceDetachFailed(reason=reason,
dev=network_info)
for vif in network_info:
if vif['vnic_type'] == network_model.VNIC_TYPE_DIRECT:
cfg = self.vif_driver.get_config(instance,
vif,
instance.image_meta,
instance.flavor,
CONF.libvirt.virt_type,
self._host)
guest.detach_device(cfg, live=True)
def _set_host_enabled(self, enabled,
disable_reason=DISABLE_REASON_UNDEFINED):
"""Enables / Disables the compute service on this host.
This doesn't override non-automatic disablement with an automatic
setting; thereby permitting operators to keep otherwise
healthy hosts out of rotation.
"""
status_name = {True: 'disabled',
False: 'enabled'}
disable_service = not enabled
ctx = nova_context.get_admin_context()
try:
service = objects.Service.get_by_compute_host(ctx, CONF.host)
if service.disabled != disable_service:
# Note(jang): this is a quick fix to stop operator-
# disabled compute hosts from re-enabling themselves
# automatically. We prefix any automatic reason code
# with a fixed string. We only re-enable a host
# automatically if we find that string in place.
# This should probably be replaced with a separate flag.
if not service.disabled or (
service.disabled_reason and
service.disabled_reason.startswith(DISABLE_PREFIX)):
service.disabled = disable_service
service.disabled_reason = (
DISABLE_PREFIX + disable_reason
if disable_service else DISABLE_REASON_UNDEFINED)
service.save()
LOG.debug('Updating compute service status to %s',
status_name[disable_service])
else:
LOG.debug('Not overriding manual compute service '
'status with: %s',
status_name[disable_service])
except exception.ComputeHostNotFound:
LOG.warn(_LW('Cannot update service status on host "%s" '
'since it is not registered.'), CONF.host)
except Exception:
LOG.warn(_LW('Cannot update service status on host "%s" '
'due to an unexpected exception.'), CONF.host,
exc_info=True)
def _get_guest_cpu_model_config(self):
mode = CONF.libvirt.cpu_mode
model = CONF.libvirt.cpu_model
if (CONF.libvirt.virt_type == "kvm" or
CONF.libvirt.virt_type == "qemu"):
if mode is None:
mode = "host-model"
if mode == "none":
return vconfig.LibvirtConfigGuestCPU()
else:
if mode is None or mode == "none":
return None
if ((CONF.libvirt.virt_type != "kvm" and
CONF.libvirt.virt_type != "qemu")):
msg = _("Config requested an explicit CPU model, but "
"the current libvirt hypervisor '%s' does not "
"support selecting CPU models") % CONF.libvirt.virt_type
raise exception.Invalid(msg)
if mode == "custom" and model is None:
msg = _("Config requested a custom CPU model, but no "
"model name was provided")
raise exception.Invalid(msg)
elif mode != "custom" and model is not None:
msg = _("A CPU model name should not be set when a "
"host CPU model is requested")
raise exception.Invalid(msg)
LOG.debug("CPU mode '%(mode)s' model '%(model)s' was chosen",
{'mode': mode, 'model': (model or "")})
cpu = vconfig.LibvirtConfigGuestCPU()
cpu.mode = mode
cpu.model = model
return cpu
def _get_guest_cpu_config(self, flavor, image_meta,
guest_cpu_numa_config, instance_numa_topology):
cpu = self._get_guest_cpu_model_config()
if cpu is None:
return None
topology = hardware.get_best_cpu_topology(
flavor, image_meta, numa_topology=instance_numa_topology)
cpu.sockets = topology.sockets
cpu.cores = topology.cores
cpu.threads = topology.threads
cpu.numa = guest_cpu_numa_config
return cpu
def _get_guest_disk_config(self, instance, name, disk_mapping, inst_type,
image_type=None):
if CONF.libvirt.hw_disk_discard:
if not self._host.has_min_version(MIN_LIBVIRT_DISCARD_VERSION,
MIN_QEMU_DISCARD_VERSION,
host.HV_DRIVER_QEMU):
msg = (_('Volume sets discard option, but libvirt %(libvirt)s'
' or later is required, qemu %(qemu)s'
' or later is required.') %
{'libvirt': MIN_LIBVIRT_DISCARD_VERSION,
'qemu': MIN_QEMU_DISCARD_VERSION})
raise exception.Invalid(msg)
image = self.image_backend.image(instance,
name,
image_type)
disk_info = disk_mapping[name]
return image.libvirt_info(disk_info['bus'],
disk_info['dev'],
disk_info['type'],
self.disk_cachemode,
inst_type['extra_specs'],
self._host.get_version())
def _get_guest_fs_config(self, instance, name, image_type=None):
image = self.image_backend.image(instance,
name,
image_type)
return image.libvirt_fs_info("/", "ploop")
def _get_guest_storage_config(self, instance, image_meta,
disk_info,
rescue, block_device_info,
inst_type, os_type):
devices = []
disk_mapping = disk_info['mapping']
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
mount_rootfs = CONF.libvirt.virt_type == "lxc"
if mount_rootfs:
fs = vconfig.LibvirtConfigGuestFilesys()
fs.source_type = "mount"
fs.source_dir = os.path.join(
libvirt_utils.get_instance_path(instance), 'rootfs')
devices.append(fs)
elif os_type == vm_mode.EXE and CONF.libvirt.virt_type == "parallels":
if 'disk' in disk_mapping:
fs = self._get_guest_fs_config(instance, "disk")
devices.append(fs)
else:
if rescue:
diskrescue = self._get_guest_disk_config(instance,
'disk.rescue',
disk_mapping,
inst_type)
devices.append(diskrescue)
diskos = self._get_guest_disk_config(instance,
'disk',
disk_mapping,
inst_type)
devices.append(diskos)
else:
if 'disk' in disk_mapping:
diskos = self._get_guest_disk_config(instance,
'disk',
disk_mapping,
inst_type)
devices.append(diskos)
if 'disk.local' in disk_mapping:
disklocal = self._get_guest_disk_config(instance,
'disk.local',
disk_mapping,
inst_type)
devices.append(disklocal)
instance.default_ephemeral_device = (
block_device.prepend_dev(disklocal.target_dev))
for idx, eph in enumerate(
driver.block_device_info_get_ephemerals(
block_device_info)):
diskeph = self._get_guest_disk_config(
instance,
blockinfo.get_eph_disk(idx),
disk_mapping, inst_type)
devices.append(diskeph)
if 'disk.swap' in disk_mapping:
diskswap = self._get_guest_disk_config(instance,
'disk.swap',
disk_mapping,
inst_type)
devices.append(diskswap)
instance.default_swap_device = (
block_device.prepend_dev(diskswap.target_dev))
if 'disk.config' in disk_mapping:
diskconfig = self._get_guest_disk_config(
instance, 'disk.config', disk_mapping, inst_type,
self._get_disk_config_image_type())
devices.append(diskconfig)
for vol in block_device.get_bdms_to_connect(block_device_mapping,
mount_rootfs):
connection_info = vol['connection_info']
vol_dev = block_device.prepend_dev(vol['mount_device'])
info = disk_mapping[vol_dev]
self._connect_volume(connection_info, info)
cfg = self._get_volume_config(connection_info, info)
devices.append(cfg)
vol['connection_info'] = connection_info
vol.save()
for d in devices:
self._set_cache_mode(d)
if image_meta.properties.get('hw_scsi_model'):
hw_scsi_model = image_meta.properties.hw_scsi_model
scsi_controller = vconfig.LibvirtConfigGuestController()
scsi_controller.type = 'scsi'
scsi_controller.model = hw_scsi_model
devices.append(scsi_controller)
return devices
def _get_host_sysinfo_serial_hardware(self):
"""Get a UUID from the host hardware
Get a UUID for the host hardware reported by libvirt.
This is typically from the SMBIOS data, unless it has
been overridden in /etc/libvirt/libvirtd.conf
"""
caps = self._host.get_capabilities()
return caps.host.uuid
def _get_host_sysinfo_serial_os(self):
"""Get a UUID from the host operating system
Get a UUID for the host operating system. Modern Linux
distros based on systemd provide a /etc/machine-id
file containing a UUID. This is also provided inside
systemd based containers and can be provided by other
init systems too, since it is just a plain text file.
"""
if not os.path.exists("/etc/machine-id"):
msg = _("Unable to get host UUID: /etc/machine-id does not exist")
raise exception.NovaException(msg)
with open("/etc/machine-id") as f:
# We want to have '-' in the right place
# so we parse & reformat the value
lines = f.read().split()
if not lines:
msg = _("Unable to get host UUID: /etc/machine-id is empty")
raise exception.NovaException(msg)
return str(uuid.UUID(lines[0]))
def _get_host_sysinfo_serial_auto(self):
if os.path.exists("/etc/machine-id"):
return self._get_host_sysinfo_serial_os()
else:
return self._get_host_sysinfo_serial_hardware()
def _get_guest_config_sysinfo(self, instance):
sysinfo = vconfig.LibvirtConfigGuestSysinfo()
sysinfo.system_manufacturer = version.vendor_string()
sysinfo.system_product = version.product_string()
sysinfo.system_version = version.version_string_with_package()
sysinfo.system_serial = self._sysinfo_serial_func()
sysinfo.system_uuid = instance.uuid
sysinfo.system_family = "Virtual Machine"
return sysinfo
def _get_guest_pci_device(self, pci_device):
dbsf = pci_utils.parse_address(pci_device.address)
dev = vconfig.LibvirtConfigGuestHostdevPCI()
dev.domain, dev.bus, dev.slot, dev.function = dbsf
# only kvm support managed mode
if CONF.libvirt.virt_type in ('xen', 'parallels',):
dev.managed = 'no'
if CONF.libvirt.virt_type in ('kvm', 'qemu'):
dev.managed = 'yes'
return dev
def _get_guest_config_meta(self, context, instance):
"""Get metadata config for guest."""
meta = vconfig.LibvirtConfigGuestMetaNovaInstance()
meta.package = version.version_string_with_package()
meta.name = instance.display_name
meta.creationTime = time.time()
if instance.image_ref not in ("", None):
meta.roottype = "image"
meta.rootid = instance.image_ref
if context is not None:
ometa = vconfig.LibvirtConfigGuestMetaNovaOwner()
ometa.userid = context.user_id
ometa.username = context.user_name
ometa.projectid = context.project_id
ometa.projectname = context.project_name
meta.owner = ometa
fmeta = vconfig.LibvirtConfigGuestMetaNovaFlavor()
flavor = instance.flavor
fmeta.name = flavor.name
fmeta.memory = flavor.memory_mb
fmeta.vcpus = flavor.vcpus
fmeta.ephemeral = flavor.ephemeral_gb
fmeta.disk = flavor.root_gb
fmeta.swap = flavor.swap
meta.flavor = fmeta
return meta
def _machine_type_mappings(self):
mappings = {}
for mapping in CONF.libvirt.hw_machine_type:
host_arch, _, machine_type = mapping.partition('=')
mappings[host_arch] = machine_type
return mappings
def _get_machine_type(self, image_meta, caps):
# The underlying machine type can be set as an image attribute,
# or otherwise based on some architecture specific defaults
mach_type = None
if image_meta.properties.get('hw_machine_type') is not None:
mach_type = image_meta.properties.hw_machine_type
else:
# For ARM systems we will default to vexpress-a15 for armv7
# and virt for aarch64
if caps.host.cpu.arch == arch.ARMV7:
mach_type = "vexpress-a15"
if caps.host.cpu.arch == arch.AARCH64:
mach_type = "virt"
if caps.host.cpu.arch in (arch.S390, arch.S390X):
mach_type = 's390-ccw-virtio'
# If set in the config, use that as the default.
if CONF.libvirt.hw_machine_type:
mappings = self._machine_type_mappings()
mach_type = mappings.get(caps.host.cpu.arch)
return mach_type
@staticmethod
def _create_idmaps(klass, map_strings):
idmaps = []
if len(map_strings) > 5:
map_strings = map_strings[0:5]
LOG.warn(_LW("Too many id maps, only included first five."))
for map_string in map_strings:
try:
idmap = klass()
values = [int(i) for i in map_string.split(":")]
idmap.start = values[0]
idmap.target = values[1]
idmap.count = values[2]
idmaps.append(idmap)
except (ValueError, IndexError):
LOG.warn(_LW("Invalid value for id mapping %s"), map_string)
return idmaps
def _get_guest_idmaps(self):
id_maps = []
if CONF.libvirt.virt_type == 'lxc' and CONF.libvirt.uid_maps:
uid_maps = self._create_idmaps(vconfig.LibvirtConfigGuestUIDMap,
CONF.libvirt.uid_maps)
id_maps.extend(uid_maps)
if CONF.libvirt.virt_type == 'lxc' and CONF.libvirt.gid_maps:
gid_maps = self._create_idmaps(vconfig.LibvirtConfigGuestGIDMap,
CONF.libvirt.gid_maps)
id_maps.extend(gid_maps)
return id_maps
def _update_guest_cputune(self, guest, flavor, virt_type):
is_able = self._host.is_cpu_control_policy_capable()
cputuning = ['shares', 'period', 'quota']
wants_cputune = any([k for k in cputuning
if "quota:cpu_" + k in flavor.extra_specs.keys()])
if wants_cputune and not is_able:
raise exception.UnsupportedHostCPUControlPolicy()
if not is_able or virt_type not in ('lxc', 'kvm', 'qemu'):
return
if guest.cputune is None:
guest.cputune = vconfig.LibvirtConfigGuestCPUTune()
# Setting the default cpu.shares value to be a value
# dependent on the number of vcpus
guest.cputune.shares = 1024 * guest.vcpus
for name in cputuning:
key = "quota:cpu_" + name
if key in flavor.extra_specs:
setattr(guest.cputune, name,
int(flavor.extra_specs[key]))
def _get_cpu_numa_config_from_instance(self, instance_numa_topology,
wants_hugepages):
if instance_numa_topology:
guest_cpu_numa = vconfig.LibvirtConfigGuestCPUNUMA()
for instance_cell in instance_numa_topology.cells:
guest_cell = vconfig.LibvirtConfigGuestCPUNUMACell()
guest_cell.id = instance_cell.id
guest_cell.cpus = instance_cell.cpuset
guest_cell.memory = instance_cell.memory * units.Ki
# The vhost-user network backend requires file backed
# guest memory (ie huge pages) to be marked as shared
# access, not private, so an external process can read
# and write the pages.
#
# You can't change the shared vs private flag for an
# already running guest, and since we can't predict what
# types of NIC may be hotplugged, we have no choice but
# to unconditionally turn on the shared flag. This has
# no real negative functional effect on the guest, so
# is a reasonable approach to take
if wants_hugepages:
guest_cell.memAccess = "shared"
guest_cpu_numa.cells.append(guest_cell)
return guest_cpu_numa
def _has_cpu_policy_support(self):
for ver in BAD_LIBVIRT_CPU_POLICY_VERSIONS:
if self._host.has_version(ver):
ver_ = self._version_to_string(ver)
raise exception.CPUPinningNotSupported(reason=_(
'Invalid libvirt version %(version)s') % {'version': ver_})
return True
def _wants_hugepages(self, host_topology, instance_topology):
"""Determine if the guest / host topology implies the
use of huge pages for guest RAM backing
"""
if host_topology is None or instance_topology is None:
return False
avail_pagesize = [page.size_kb
for page in host_topology.cells[0].mempages]
avail_pagesize.sort()
# Remove smallest page size as that's not classed as a largepage
avail_pagesize = avail_pagesize[1:]
# See if we have page size set
for cell in instance_topology.cells:
if (cell.pagesize is not None and
cell.pagesize in avail_pagesize):
return True
return False
def _get_guest_numa_config(self, instance_numa_topology, flavor, pci_devs,
allowed_cpus=None, image_meta=None):
"""Returns the config objects for the guest NUMA specs.
Determines the CPUs that the guest can be pinned to if the guest
specifies a cell topology and the host supports it. Constructs the
libvirt XML config object representing the NUMA topology selected
for the guest. Returns a tuple of:
(cpu_set, guest_cpu_tune, guest_cpu_numa, guest_numa_tune)
With the following caveats:
a) If there is no specified guest NUMA topology, then
all tuple elements except cpu_set shall be None. cpu_set
will be populated with the chosen CPUs that the guest
allowed CPUs fit within, which could be the supplied
allowed_cpus value if the host doesn't support NUMA
topologies.
b) If there is a specified guest NUMA topology, then
cpu_set will be None and guest_cpu_numa will be the
LibvirtConfigGuestCPUNUMA object representing the guest's
NUMA topology. If the host supports NUMA, then guest_cpu_tune
will contain a LibvirtConfigGuestCPUTune object representing
the optimized chosen cells that match the host capabilities
with the instance's requested topology. If the host does
not support NUMA, then guest_cpu_tune and guest_numa_tune
will be None.
"""
if (not self._has_numa_support() and
instance_numa_topology is not None):
# We should not get here, since we should have avoided
# reporting NUMA topology from _get_host_numa_topology
# in the first place. Just in case of a scheduler
# mess up though, raise an exception
raise exception.NUMATopologyUnsupported()
topology = self._get_host_numa_topology()
# We have instance NUMA so translate it to the config class
guest_cpu_numa_config = self._get_cpu_numa_config_from_instance(
instance_numa_topology,
self._wants_hugepages(topology, instance_numa_topology))
if not guest_cpu_numa_config:
# No NUMA topology defined for instance - let the host kernel deal
# with the NUMA effects.
# TODO(ndipanov): Attempt to spread the instance
# across NUMA nodes and expose the topology to the
# instance as an optimisation
return GuestNumaConfig(allowed_cpus, None, None, None)
else:
if topology:
# Now get the CpuTune configuration from the numa_topology
guest_cpu_tune = vconfig.LibvirtConfigGuestCPUTune()
guest_numa_tune = vconfig.LibvirtConfigGuestNUMATune()
allpcpus = []
numa_mem = vconfig.LibvirtConfigGuestNUMATuneMemory()
numa_memnodes = [vconfig.LibvirtConfigGuestNUMATuneMemNode()
for _ in guest_cpu_numa_config.cells]
for host_cell in topology.cells:
for guest_node_id, guest_config_cell in enumerate(
guest_cpu_numa_config.cells):
if guest_config_cell.id == host_cell.id:
node = numa_memnodes[guest_node_id]
node.cellid = guest_config_cell.id
node.nodeset = [host_cell.id]
node.mode = "strict"
numa_mem.nodeset.append(host_cell.id)
object_numa_cell = (
instance_numa_topology.cells[guest_node_id]
)
for cpu in guest_config_cell.cpus:
pin_cpuset = (
vconfig.LibvirtConfigGuestCPUTuneVCPUPin())
pin_cpuset.id = cpu
# If there is pinning information in the cell
# we pin to individual CPUs, otherwise we float
# over the whole host NUMA node
if (object_numa_cell.cpu_pinning and
self._has_cpu_policy_support()):
pcpu = object_numa_cell.cpu_pinning[cpu]
pin_cpuset.cpuset = set([pcpu])
else:
pin_cpuset.cpuset = host_cell.cpuset
allpcpus.extend(pin_cpuset.cpuset)
guest_cpu_tune.vcpupin.append(pin_cpuset)
# TODO(berrange) When the guest has >1 NUMA node, it will
# span multiple host NUMA nodes. By pinning emulator threads
# to the union of all nodes, we guarantee there will be
# cross-node memory access by the emulator threads when
# responding to guest I/O operations. The only way to avoid
# this would be to pin emulator threads to a single node and
# tell the guest OS to only do I/O from one of its virtual
# NUMA nodes. This is not even remotely practical.
#
# The long term solution is to make use of a new QEMU feature
# called "I/O Threads" which will let us configure an explicit
# I/O thread for each guest vCPU or guest NUMA node. It is
# still TBD how to make use of this feature though, especially
# how to associate IO threads with guest devices to eliminiate
# cross NUMA node traffic. This is an area of investigation
# for QEMU community devs.
emulatorpin = vconfig.LibvirtConfigGuestCPUTuneEmulatorPin()
emulatorpin.cpuset = set(allpcpus)
guest_cpu_tune.emulatorpin = emulatorpin
# Sort the vcpupin list per vCPU id for human-friendlier XML
guest_cpu_tune.vcpupin.sort(key=operator.attrgetter("id"))
if hardware.is_realtime_enabled(flavor):
if not self._host.has_min_version(
MIN_LIBVIRT_REALTIME_VERSION):
raise exception.RealtimePolicyNotSupported()
vcpus_rt, vcpus_em = hardware.vcpus_realtime_topology(
set(cpu.id for cpu in guest_cpu_tune.vcpupin),
flavor, image_meta)
vcpusched = vconfig.LibvirtConfigGuestCPUTuneVCPUSched()
vcpusched.vcpus = vcpus_rt
vcpusched.scheduler = "fifo"
vcpusched.priority = (
CONF.libvirt.realtime_scheduler_priority)
guest_cpu_tune.vcpusched.append(vcpusched)
guest_cpu_tune.emulatorpin.cpuset = vcpus_em
guest_numa_tune.memory = numa_mem
guest_numa_tune.memnodes = numa_memnodes
# normalize cell.id
for i, (cell, memnode) in enumerate(
zip(guest_cpu_numa_config.cells,
guest_numa_tune.memnodes)):
cell.id = i
memnode.cellid = i
return GuestNumaConfig(None, guest_cpu_tune,
guest_cpu_numa_config,
guest_numa_tune)
else:
return GuestNumaConfig(allowed_cpus, None,
guest_cpu_numa_config, None)
def _get_guest_os_type(self, virt_type):
"""Returns the guest OS type based on virt type."""
if virt_type == "lxc":
ret = vm_mode.EXE
elif virt_type == "uml":
ret = vm_mode.UML
elif virt_type == "xen":
ret = vm_mode.XEN
else:
ret = vm_mode.HVM
return ret
def _set_guest_for_rescue(self, rescue, guest, inst_path, virt_type,
root_device_name):
if rescue.get('kernel_id'):
guest.os_kernel = os.path.join(inst_path, "kernel.rescue")
if virt_type == "xen":
guest.os_cmdline = "ro root=%s" % root_device_name
else:
guest.os_cmdline = ("root=%s %s" % (root_device_name, CONSOLE))
if virt_type == "qemu":
guest.os_cmdline += " no_timer_check"
if rescue.get('ramdisk_id'):
guest.os_initrd = os.path.join(inst_path, "ramdisk.rescue")
def _set_guest_for_inst_kernel(self, instance, guest, inst_path, virt_type,
root_device_name, image_meta):
guest.os_kernel = os.path.join(inst_path, "kernel")
if virt_type == "xen":
guest.os_cmdline = "ro root=%s" % root_device_name
else:
guest.os_cmdline = ("root=%s %s" % (root_device_name, CONSOLE))
if virt_type == "qemu":
guest.os_cmdline += " no_timer_check"
if instance.ramdisk_id:
guest.os_initrd = os.path.join(inst_path, "ramdisk")
# we only support os_command_line with images with an explicit
# kernel set and don't want to break nova if there's an
# os_command_line property without a specified kernel_id param
if image_meta.properties.get("os_command_line"):
guest.os_cmdline = image_meta.properties.os_command_line
def _set_clock(self, guest, os_type, image_meta, virt_type):
# NOTE(mikal): Microsoft Windows expects the clock to be in
# "localtime". If the clock is set to UTC, then you can use a
# registry key to let windows know, but Microsoft says this is
# buggy in http://support.microsoft.com/kb/2687252
clk = vconfig.LibvirtConfigGuestClock()
if os_type == 'windows':
LOG.info(_LI('Configuring timezone for windows instance to '
'localtime'))
clk.offset = 'localtime'
else:
clk.offset = 'utc'
guest.set_clock(clk)
if virt_type == "kvm":
self._set_kvm_timers(clk, os_type, image_meta)
def _set_kvm_timers(self, clk, os_type, image_meta):
# TODO(berrange) One day this should be per-guest
# OS type configurable
tmpit = vconfig.LibvirtConfigGuestTimer()
tmpit.name = "pit"
tmpit.tickpolicy = "delay"
tmrtc = vconfig.LibvirtConfigGuestTimer()
tmrtc.name = "rtc"
tmrtc.tickpolicy = "catchup"
clk.add_timer(tmpit)
clk.add_timer(tmrtc)
guestarch = libvirt_utils.get_arch(image_meta)
if guestarch in (arch.I686, arch.X86_64):
# NOTE(rfolco): HPET is a hardware timer for x86 arch.
# qemu -no-hpet is not supported on non-x86 targets.
tmhpet = vconfig.LibvirtConfigGuestTimer()
tmhpet.name = "hpet"
tmhpet.present = False
clk.add_timer(tmhpet)
# With new enough QEMU we can provide Windows guests
# with the paravirtualized hyperv timer source. This
# is the windows equiv of kvm-clock, allowing Windows
# guests to accurately keep time.
if (os_type == 'windows' and
self._host.has_min_version(MIN_LIBVIRT_HYPERV_TIMER_VERSION,
MIN_QEMU_HYPERV_TIMER_VERSION)):
tmhyperv = vconfig.LibvirtConfigGuestTimer()
tmhyperv.name = "hypervclock"
tmhyperv.present = True
clk.add_timer(tmhyperv)
def _set_features(self, guest, os_type, caps, virt_type):
if virt_type == "xen":
# PAE only makes sense in X86
if caps.host.cpu.arch in (arch.I686, arch.X86_64):
guest.features.append(vconfig.LibvirtConfigGuestFeaturePAE())
if (virt_type not in ("lxc", "uml", "parallels", "xen") or
(virt_type == "xen" and guest.os_type == vm_mode.HVM)):
guest.features.append(vconfig.LibvirtConfigGuestFeatureACPI())
guest.features.append(vconfig.LibvirtConfigGuestFeatureAPIC())
if (virt_type in ("qemu", "kvm") and
os_type == 'windows' and
self._host.has_min_version(MIN_LIBVIRT_HYPERV_FEATURE_VERSION,
MIN_QEMU_HYPERV_FEATURE_VERSION)):
hv = vconfig.LibvirtConfigGuestFeatureHyperV()
hv.relaxed = True
if self._host.has_min_version(
MIN_LIBVIRT_HYPERV_FEATURE_EXTRA_VERSION):
hv.spinlocks = True
# Increase spinlock retries - value recommended by
# KVM maintainers who certify Windows guests
# with Microsoft
hv.spinlock_retries = 8191
hv.vapic = True
guest.features.append(hv)
def _create_serial_console_devices(self, guest, instance, flavor,
image_meta):
guest_arch = libvirt_utils.get_arch(image_meta)
if CONF.serial_console.enabled:
num_ports = hardware.get_number_of_serial_ports(
flavor, image_meta)
for port in six.moves.range(num_ports):
if guest_arch in (arch.S390, arch.S390X):
console = vconfig.LibvirtConfigGuestConsole()
else:
console = vconfig.LibvirtConfigGuestSerial()
console.port = port
console.type = "tcp"
console.listen_host = (
CONF.serial_console.proxyclient_address)
console.listen_port = (
serial_console.acquire_port(
console.listen_host))
guest.add_device(console)
else:
# The QEMU 'pty' driver throws away any data if no
# client app is connected. Thus we can't get away
# with a single type=pty console. Instead we have
# to configure two separate consoles.
if guest_arch in (arch.S390, arch.S390X):
consolelog = vconfig.LibvirtConfigGuestConsole()
consolelog.target_type = "sclplm"
else:
consolelog = vconfig.LibvirtConfigGuestSerial()
consolelog.type = "file"
consolelog.source_path = self._get_console_log_path(instance)
guest.add_device(consolelog)
def _add_video_driver(self, guest, image_meta, flavor):
VALID_VIDEO_DEVICES = ("vga", "cirrus", "vmvga", "xen", "qxl")
video = vconfig.LibvirtConfigGuestVideo()
# NOTE(ldbragst): The following logic sets the video.type
# depending on supported defaults given the architecture,
# virtualization type, and features. The video.type attribute can
# be overridden by the user with image_meta.properties, which
# is carried out in the next if statement below this one.
guestarch = libvirt_utils.get_arch(image_meta)
if guest.os_type == vm_mode.XEN:
video.type = 'xen'
elif CONF.libvirt.virt_type == 'parallels':
video.type = 'vga'
elif guestarch in (arch.PPC, arch.PPC64, arch.PPC64LE):
# NOTE(ldbragst): PowerKVM doesn't support 'cirrus' be default
# so use 'vga' instead when running on Power hardware.
video.type = 'vga'
elif CONF.spice.enabled:
video.type = 'qxl'
if image_meta.properties.get('hw_video_model'):
video.type = image_meta.properties.hw_video_model
if (video.type not in VALID_VIDEO_DEVICES):
raise exception.InvalidVideoMode(model=video.type)
# Set video memory, only if the flavor's limit is set
video_ram = image_meta.properties.get('hw_video_ram', 0)
max_vram = int(flavor.extra_specs.get('hw_video:ram_max_mb', 0))
if video_ram > max_vram:
raise exception.RequestedVRamTooHigh(req_vram=video_ram,
max_vram=max_vram)
if max_vram and video_ram:
video.vram = video_ram * units.Mi / units.Ki
guest.add_device(video)
def _add_qga_device(self, guest, instance):
qga = vconfig.LibvirtConfigGuestChannel()
qga.type = "unix"
qga.target_name = "org.qemu.guest_agent.0"
qga.source_path = ("/var/lib/libvirt/qemu/%s.%s.sock" %
("org.qemu.guest_agent.0", instance.name))
guest.add_device(qga)
def _add_rng_device(self, guest, flavor):
rng_device = vconfig.LibvirtConfigGuestRng()
rate_bytes = flavor.extra_specs.get('hw_rng:rate_bytes', 0)
period = flavor.extra_specs.get('hw_rng:rate_period', 0)
if rate_bytes:
rng_device.rate_bytes = int(rate_bytes)
rng_device.rate_period = int(period)
rng_path = CONF.libvirt.rng_dev_path
if (rng_path and not os.path.exists(rng_path)):
raise exception.RngDeviceNotExist(path=rng_path)
rng_device.backend = rng_path
guest.add_device(rng_device)
def _set_qemu_guest_agent(self, guest, flavor, instance, image_meta):
# Enable qga only if the 'hw_qemu_guest_agent' is equal to yes
if image_meta.properties.get('hw_qemu_guest_agent', False):
LOG.debug("Qemu guest agent is enabled through image "
"metadata", instance=instance)
self._add_qga_device(guest, instance)
rng_is_virtio = image_meta.properties.get('hw_rng_model') == 'virtio'
rng_allowed_str = flavor.extra_specs.get('hw_rng:allowed', '')
rng_allowed = strutils.bool_from_string(rng_allowed_str)
if rng_is_virtio and rng_allowed:
self._add_rng_device(guest, flavor)
def _get_guest_memory_backing_config(
self, inst_topology, numatune, flavor):
wantsmempages = False
if inst_topology:
for cell in inst_topology.cells:
if cell.pagesize:
wantsmempages = True
break
wantsrealtime = hardware.is_realtime_enabled(flavor)
membacking = None
if wantsmempages:
pages = self._get_memory_backing_hugepages_support(
inst_topology, numatune)
if pages:
membacking = vconfig.LibvirtConfigGuestMemoryBacking()
membacking.hugepages = pages
if wantsrealtime:
if not membacking:
membacking = vconfig.LibvirtConfigGuestMemoryBacking()
membacking.locked = True
membacking.sharedpages = False
return membacking
def _get_memory_backing_hugepages_support(self, inst_topology, numatune):
if not self._has_hugepage_support():
# We should not get here, since we should have avoided
# reporting NUMA topology from _get_host_numa_topology
# in the first place. Just in case of a scheduler
# mess up though, raise an exception
raise exception.MemoryPagesUnsupported()
host_topology = self._get_host_numa_topology()
if host_topology is None:
# As above, we should not get here but just in case...
raise exception.MemoryPagesUnsupported()
# Currently libvirt does not support the smallest
# pagesize set as a backend memory.
# https://bugzilla.redhat.com/show_bug.cgi?id=1173507
avail_pagesize = [page.size_kb
for page in host_topology.cells[0].mempages]
avail_pagesize.sort()
smallest = avail_pagesize[0]
pages = []
for guest_cellid, inst_cell in enumerate(inst_topology.cells):
if inst_cell.pagesize and inst_cell.pagesize > smallest:
for memnode in numatune.memnodes:
if guest_cellid == memnode.cellid:
page = (
vconfig.LibvirtConfigGuestMemoryBackingPage())
page.nodeset = [guest_cellid]
page.size_kb = inst_cell.pagesize
pages.append(page)
break # Quit early...
return pages
def _get_flavor(self, ctxt, instance, flavor):
if flavor is not None:
return flavor
return instance.flavor
def _has_uefi_support(self):
# This means that the host can support uefi booting for guests
supported_archs = [arch.X86_64, arch.AARCH64]
caps = self._host.get_capabilities()
return ((caps.host.cpu.arch in supported_archs) and
self._host.has_min_version(MIN_LIBVIRT_UEFI_VERSION) and
os.path.exists(DEFAULT_UEFI_LOADER_PATH[caps.host.cpu.arch]))
def _configure_guest_by_virt_type(self, guest, virt_type, caps, instance,
image_meta, flavor, root_device_name):
if virt_type == "xen":
if guest.os_type == vm_mode.HVM:
guest.os_loader = CONF.libvirt.xen_hvmloader_path
elif virt_type in ("kvm", "qemu"):
if caps.host.cpu.arch in (arch.I686, arch.X86_64):
guest.sysinfo = self._get_guest_config_sysinfo(instance)
guest.os_smbios = vconfig.LibvirtConfigGuestSMBIOS()
hw_firmware_type = image_meta.properties.get('hw_firmware_type')
if hw_firmware_type == fields.FirmwareType.UEFI:
if self._has_uefi_support():
global uefi_logged
if not uefi_logged:
LOG.warn(_LW("uefi support is without some kind of "
"functional testing and therefore "
"considered experimental."))
uefi_logged = True
guest.os_loader = DEFAULT_UEFI_LOADER_PATH[
caps.host.cpu.arch]
guest.os_loader_type = "pflash"
else:
raise exception.UEFINotSupported()
guest.os_mach_type = self._get_machine_type(image_meta, caps)
if image_meta.properties.get('hw_boot_menu') is None:
guest.os_bootmenu = strutils.bool_from_string(
flavor.extra_specs.get('hw:boot_menu', 'no'))
else:
guest.os_bootmenu = image_meta.properties.hw_boot_menu
elif virt_type == "lxc":
guest.os_init_path = "/sbin/init"
guest.os_cmdline = CONSOLE
elif virt_type == "uml":
guest.os_kernel = "/usr/bin/linux"
guest.os_root = root_device_name
elif virt_type == "parallels":
if guest.os_type == vm_mode.EXE:
guest.os_init_path = "/sbin/init"
def _conf_non_lxc_uml(self, virt_type, guest, root_device_name, rescue,
instance, inst_path, image_meta, disk_info):
if rescue:
self._set_guest_for_rescue(rescue, guest, inst_path, virt_type,
root_device_name)
elif instance.kernel_id:
self._set_guest_for_inst_kernel(instance, guest, inst_path,
virt_type, root_device_name,
image_meta)
else:
guest.os_boot_dev = blockinfo.get_boot_order(disk_info)
def _create_consoles(self, virt_type, guest, instance, flavor, image_meta,
caps):
if virt_type in ("qemu", "kvm"):
# Create the serial console char devices
self._create_serial_console_devices(guest, instance, flavor,
image_meta)
if caps.host.cpu.arch in (arch.S390, arch.S390X):
consolepty = vconfig.LibvirtConfigGuestConsole()
consolepty.target_type = "sclp"
else:
consolepty = vconfig.LibvirtConfigGuestSerial()
else:
consolepty = vconfig.LibvirtConfigGuestConsole()
return consolepty
def _cpu_config_to_vcpu_model(self, cpu_config, vcpu_model):
"""Update VirtCPUModel object according to libvirt CPU config.
:param:cpu_config: vconfig.LibvirtConfigGuestCPU presenting the
instance's virtual cpu configuration.
:param:vcpu_model: VirtCPUModel object. A new object will be created
if None.
:return: Updated VirtCPUModel object, or None if cpu_config is None
"""
if not cpu_config:
return
if not vcpu_model:
vcpu_model = objects.VirtCPUModel()
vcpu_model.arch = cpu_config.arch
vcpu_model.vendor = cpu_config.vendor
vcpu_model.model = cpu_config.model
vcpu_model.mode = cpu_config.mode
vcpu_model.match = cpu_config.match
if cpu_config.sockets:
vcpu_model.topology = objects.VirtCPUTopology(
sockets=cpu_config.sockets,
cores=cpu_config.cores,
threads=cpu_config.threads)
else:
vcpu_model.topology = None
features = [objects.VirtCPUFeature(
name=f.name,
policy=f.policy) for f in cpu_config.features]
vcpu_model.features = features
return vcpu_model
def _vcpu_model_to_cpu_config(self, vcpu_model):
"""Create libvirt CPU config according to VirtCPUModel object.
:param:vcpu_model: VirtCPUModel object.
:return: vconfig.LibvirtConfigGuestCPU.
"""
cpu_config = vconfig.LibvirtConfigGuestCPU()
cpu_config.arch = vcpu_model.arch
cpu_config.model = vcpu_model.model
cpu_config.mode = vcpu_model.mode
cpu_config.match = vcpu_model.match
cpu_config.vendor = vcpu_model.vendor
if vcpu_model.topology:
cpu_config.sockets = vcpu_model.topology.sockets
cpu_config.cores = vcpu_model.topology.cores
cpu_config.threads = vcpu_model.topology.threads
if vcpu_model.features:
for f in vcpu_model.features:
xf = vconfig.LibvirtConfigGuestCPUFeature()
xf.name = f.name
xf.policy = f.policy
cpu_config.features.add(xf)
return cpu_config
def _get_guest_config(self, instance, network_info, image_meta,
disk_info, rescue=None, block_device_info=None,
context=None):
"""Get config data for parameters.
:param rescue: optional dictionary that should contain the key
'ramdisk_id' if a ramdisk is needed for the rescue image and
'kernel_id' if a kernel is needed for the rescue image.
"""
flavor = instance.flavor
inst_path = libvirt_utils.get_instance_path(instance)
disk_mapping = disk_info['mapping']
virt_type = CONF.libvirt.virt_type
guest = vconfig.LibvirtConfigGuest()
guest.virt_type = virt_type
guest.name = instance.name
guest.uuid = instance.uuid
# We are using default unit for memory: KiB
guest.memory = flavor.memory_mb * units.Ki
guest.vcpus = flavor.vcpus
allowed_cpus = hardware.get_vcpu_pin_set()
pci_devs = pci_manager.get_instance_pci_devs(instance, 'all')
guest_numa_config = self._get_guest_numa_config(
instance.numa_topology, flavor, pci_devs, allowed_cpus, image_meta)
guest.cpuset = guest_numa_config.cpuset
guest.cputune = guest_numa_config.cputune
guest.numatune = guest_numa_config.numatune
guest.membacking = self._get_guest_memory_backing_config(
instance.numa_topology,
guest_numa_config.numatune,
flavor)
guest.metadata.append(self._get_guest_config_meta(context,
instance))
guest.idmaps = self._get_guest_idmaps()
self._update_guest_cputune(guest, flavor, virt_type)
guest.cpu = self._get_guest_cpu_config(
flavor, image_meta, guest_numa_config.numaconfig,
instance.numa_topology)
# Notes(yjiang5): we always sync the instance's vcpu model with
# the corresponding config file.
instance.vcpu_model = self._cpu_config_to_vcpu_model(
guest.cpu, instance.vcpu_model)
if 'root' in disk_mapping:
root_device_name = block_device.prepend_dev(
disk_mapping['root']['dev'])
else:
root_device_name = None
if root_device_name:
# NOTE(yamahata):
# for nova.api.ec2.cloud.CloudController.get_metadata()
instance.root_device_name = root_device_name
guest.os_type = (vm_mode.get_from_instance(instance) or
self._get_guest_os_type(virt_type))
caps = self._host.get_capabilities()
self._configure_guest_by_virt_type(guest, virt_type, caps, instance,
image_meta, flavor,
root_device_name)
if virt_type not in ('lxc', 'uml'):
self._conf_non_lxc_uml(virt_type, guest, root_device_name, rescue,
instance, inst_path, image_meta, disk_info)
self._set_features(guest, instance.os_type, caps, virt_type)
self._set_clock(guest, instance.os_type, image_meta, virt_type)
storage_configs = self._get_guest_storage_config(
instance, image_meta, disk_info, rescue, block_device_info,
flavor, guest.os_type)
for config in storage_configs:
guest.add_device(config)
for vif in network_info:
config = self.vif_driver.get_config(
instance, vif, image_meta,
flavor, virt_type, self._host)
guest.add_device(config)
consolepty = self._create_consoles(virt_type, guest, instance, flavor,
image_meta, caps)
if virt_type != 'parallels':
consolepty.type = "pty"
guest.add_device(consolepty)
tablet = self._get_guest_usb_tablet(guest.os_type)
if tablet:
guest.add_device(tablet)
if (CONF.spice.enabled and CONF.spice.agent_enabled and
virt_type not in ('lxc', 'uml', 'xen')):
channel = vconfig.LibvirtConfigGuestChannel()
channel.target_name = "com.redhat.spice.0"
guest.add_device(channel)
# NB some versions of libvirt support both SPICE and VNC
# at the same time. We're not trying to second guess which
# those versions are. We'll just let libvirt report the
# errors appropriately if the user enables both.
add_video_driver = False
if ((CONF.vnc.enabled and
virt_type not in ('lxc', 'uml'))):
graphics = vconfig.LibvirtConfigGuestGraphics()
graphics.type = "vnc"
graphics.keymap = CONF.vnc.keymap
graphics.listen = CONF.vnc.vncserver_listen
guest.add_device(graphics)
add_video_driver = True
if (CONF.spice.enabled and
virt_type not in ('lxc', 'uml', 'xen')):
graphics = vconfig.LibvirtConfigGuestGraphics()
graphics.type = "spice"
graphics.keymap = CONF.spice.keymap
graphics.listen = CONF.spice.server_listen
guest.add_device(graphics)
add_video_driver = True
if add_video_driver:
self._add_video_driver(guest, image_meta, flavor)
# Qemu guest agent only support 'qemu' and 'kvm' hypervisor
if virt_type in ('qemu', 'kvm'):
self._set_qemu_guest_agent(guest, flavor, instance, image_meta)
if virt_type in ('xen', 'qemu', 'kvm'):
for pci_dev in pci_manager.get_instance_pci_devs(instance):
guest.add_device(self._get_guest_pci_device(pci_dev))
else:
if len(pci_devs) > 0:
raise exception.PciDeviceUnsupportedHypervisor(
type=virt_type)
if 'hw_watchdog_action' in flavor.extra_specs:
LOG.warn(_LW('Old property name "hw_watchdog_action" is now '
'deprecated and will be removed in the next release. '
'Use updated property name '
'"hw:watchdog_action" instead'), instance=instance)
# TODO(pkholkin): accepting old property name 'hw_watchdog_action'
# should be removed in the next release
watchdog_action = (flavor.extra_specs.get('hw_watchdog_action') or
flavor.extra_specs.get('hw:watchdog_action')
or 'disabled')
watchdog_action = image_meta.properties.get('hw_watchdog_action',
watchdog_action)
# NB(sross): currently only actually supported by KVM/QEmu
if watchdog_action != 'disabled':
if watchdog_actions.is_valid_watchdog_action(watchdog_action):
bark = vconfig.LibvirtConfigGuestWatchdog()
bark.action = watchdog_action
guest.add_device(bark)
else:
raise exception.InvalidWatchdogAction(action=watchdog_action)
# Memory balloon device only support 'qemu/kvm' and 'xen' hypervisor
if (virt_type in ('xen', 'qemu', 'kvm') and
CONF.libvirt.mem_stats_period_seconds > 0):
balloon = vconfig.LibvirtConfigMemoryBalloon()
if virt_type in ('qemu', 'kvm'):
balloon.model = 'virtio'
else:
balloon.model = 'xen'
balloon.period = CONF.libvirt.mem_stats_period_seconds
guest.add_device(balloon)
return guest
def _get_guest_usb_tablet(self, os_type):
# We want a tablet if VNC is enabled, or SPICE is enabled and
# the SPICE agent is disabled. If the SPICE agent is enabled
# it provides a paravirt mouse which drastically reduces
# overhead (by eliminating USB polling).
#
# NB: this implies that if both SPICE + VNC are enabled
# at the same time, we'll get the tablet whether the
# SPICE agent is used or not.
need_usb_tablet = False
if CONF.vnc.enabled:
need_usb_tablet = CONF.libvirt.use_usb_tablet
elif CONF.spice.enabled and not CONF.spice.agent_enabled:
need_usb_tablet = CONF.libvirt.use_usb_tablet
tablet = None
if need_usb_tablet and os_type == vm_mode.HVM:
tablet = vconfig.LibvirtConfigGuestInput()
tablet.type = "tablet"
tablet.bus = "usb"
return tablet
def _get_guest_xml(self, context, instance, network_info, disk_info,
image_meta, rescue=None,
block_device_info=None, write_to_disk=False):
# NOTE(danms): Stringifying a NetworkInfo will take a lock. Do
# this ahead of time so that we don't acquire it while also
# holding the logging lock.
network_info_str = str(network_info)
msg = ('Start _get_guest_xml '
'network_info=%(network_info)s '
'disk_info=%(disk_info)s '
'image_meta=%(image_meta)s rescue=%(rescue)s '
'block_device_info=%(block_device_info)s' %
{'network_info': network_info_str, 'disk_info': disk_info,
'image_meta': image_meta, 'rescue': rescue,
'block_device_info': block_device_info})
# NOTE(mriedem): block_device_info can contain auth_password so we
# need to sanitize the password in the message.
LOG.debug(strutils.mask_password(msg), instance=instance)
conf = self._get_guest_config(instance, network_info, image_meta,
disk_info, rescue, block_device_info,
context)
xml = conf.to_xml()
if write_to_disk:
instance_dir = libvirt_utils.get_instance_path(instance)
xml_path = os.path.join(instance_dir, 'libvirt.xml')
libvirt_utils.write_to_file(xml_path, xml)
LOG.debug('End _get_guest_xml xml=%(xml)s',
{'xml': xml}, instance=instance)
return xml
def get_info(self, instance):
"""Retrieve information from libvirt for a specific instance name.
If a libvirt error is encountered during lookup, we might raise a
NotFound exception or Error exception depending on how severe the
libvirt error is.
"""
guest = self._host.get_guest(instance)
# Kind of ugly but we need to pass host to get_info as for a
# workaround, see libvirt/compat.py
return guest.get_info(self._host)
def _create_domain_setup_lxc(self, instance, image_meta,
block_device_info, disk_info):
inst_path = libvirt_utils.get_instance_path(instance)
disk_info = disk_info or {}
disk_mapping = disk_info.get('mapping', {})
if self._is_booted_from_volume(instance, disk_mapping):
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
root_disk = block_device.get_root_bdm(block_device_mapping)
disk_info = blockinfo.get_info_from_bdm(
instance, CONF.libvirt.virt_type, image_meta, root_disk)
self._connect_volume(root_disk['connection_info'], disk_info)
disk_path = root_disk['connection_info']['data']['device_path']
# NOTE(apmelton) - Even though the instance is being booted from a
# cinder volume, it is still presented as a local block device.
# LocalBlockImage is used here to indicate that the instance's
# disk is backed by a local block device.
image_model = imgmodel.LocalBlockImage(disk_path)
else:
image = self.image_backend.image(instance, 'disk')
image_model = image.get_model(self._conn)
container_dir = os.path.join(inst_path, 'rootfs')
fileutils.ensure_tree(container_dir)
rootfs_dev = disk.setup_container(image_model,
container_dir=container_dir)
try:
# Save rootfs device to disconnect it when deleting the instance
if rootfs_dev:
instance.system_metadata['rootfs_device_name'] = rootfs_dev
if CONF.libvirt.uid_maps or CONF.libvirt.gid_maps:
id_maps = self._get_guest_idmaps()
libvirt_utils.chown_for_id_maps(container_dir, id_maps)
except Exception:
with excutils.save_and_reraise_exception():
self._create_domain_cleanup_lxc(instance)
def _create_domain_cleanup_lxc(self, instance):
inst_path = libvirt_utils.get_instance_path(instance)
container_dir = os.path.join(inst_path, 'rootfs')
try:
state = self.get_info(instance).state
except exception.InstanceNotFound:
# The domain may not be present if the instance failed to start
state = None
if state == power_state.RUNNING:
# NOTE(uni): Now the container is running with its own private
# mount namespace and so there is no need to keep the container
# rootfs mounted in the host namespace
LOG.debug('Attempting to unmount container filesystem: %s',
container_dir, instance=instance)
disk.clean_lxc_namespace(container_dir=container_dir)
else:
disk.teardown_container(container_dir=container_dir)
@contextlib.contextmanager
def _lxc_disk_handler(self, instance, image_meta,
block_device_info, disk_info):
"""Context manager to handle the pre and post instance boot,
LXC specific disk operations.
An image or a volume path will be prepared and setup to be
used by the container, prior to starting it.
The disk will be disconnected and unmounted if a container has
failed to start.
"""
if CONF.libvirt.virt_type != 'lxc':
yield
return
self._create_domain_setup_lxc(instance, image_meta,
block_device_info, disk_info)
try:
yield
finally:
self._create_domain_cleanup_lxc(instance)
# TODO(sahid): Consider renaming this to _create_guest.
def _create_domain(self, xml=None, domain=None,
power_on=True, pause=False):
"""Create a domain.
Either domain or xml must be passed in. If both are passed, then
the domain definition is overwritten from the xml.
:returns guest.Guest: Guest just created
"""
if xml:
guest = libvirt_guest.Guest.create(xml, self._host)
else:
guest = libvirt_guest.Guest(domain)
if power_on or pause:
guest.launch(pause=pause)
if not utils.is_neutron():
guest.enable_hairpin()
return guest
def _neutron_failed_callback(self, event_name, instance):
LOG.error(_LE('Neutron Reported failure on event '
'%(event)s for instance %(uuid)s'),
{'event': event_name, 'uuid': instance.uuid},
instance=instance)
if CONF.vif_plugging_is_fatal:
raise exception.VirtualInterfaceCreateException()
def _get_neutron_events(self, network_info):
# NOTE(danms): We need to collect any VIFs that are currently
# down that we expect a down->up event for. Anything that is
# already up will not undergo that transition, and for
# anything that might be stale (cache-wise) assume it's
# already up so we don't block on it.
return [('network-vif-plugged', vif['id'])
for vif in network_info if vif.get('active', True) is False]
def _create_domain_and_network(self, context, xml, instance, network_info,
disk_info, block_device_info=None,
power_on=True, reboot=False,
vifs_already_plugged=False):
"""Do required network setup and create domain."""
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
for vol in block_device_mapping:
connection_info = vol['connection_info']
if (not reboot and 'data' in connection_info and
'volume_id' in connection_info['data']):
volume_id = connection_info['data']['volume_id']
encryption = encryptors.get_encryption_metadata(
context, self._volume_api, volume_id, connection_info)
if encryption:
encryptor = self._get_volume_encryptor(connection_info,
encryption)
encryptor.attach_volume(context, **encryption)
timeout = CONF.vif_plugging_timeout
if (self._conn_supports_start_paused and
utils.is_neutron() and not
vifs_already_plugged and power_on and timeout):
events = self._get_neutron_events(network_info)
else:
events = []
pause = bool(events)
guest = None
try:
with self.virtapi.wait_for_instance_event(
instance, events, deadline=timeout,
error_callback=self._neutron_failed_callback):
self.plug_vifs(instance, network_info)
self.firewall_driver.setup_basic_filtering(instance,
network_info)
self.firewall_driver.prepare_instance_filter(instance,
network_info)
with self._lxc_disk_handler(instance, instance.image_meta,
block_device_info, disk_info):
guest = self._create_domain(
xml, pause=pause, power_on=power_on)
self.firewall_driver.apply_instance_filter(instance,
network_info)
except exception.VirtualInterfaceCreateException:
# Neutron reported failure and we didn't swallow it, so
# bail here
with excutils.save_and_reraise_exception():
if guest:
guest.poweroff()
self.cleanup(context, instance, network_info=network_info,
block_device_info=block_device_info)
except eventlet.timeout.Timeout:
# We never heard from Neutron
LOG.warn(_LW('Timeout waiting for vif plugging callback for '
'instance %(uuid)s'), {'uuid': instance.uuid},
instance=instance)
if CONF.vif_plugging_is_fatal:
if guest:
guest.poweroff()
self.cleanup(context, instance, network_info=network_info,
block_device_info=block_device_info)
raise exception.VirtualInterfaceCreateException()
# Resume only if domain has been paused
if pause:
guest.resume()
return guest
def _get_all_block_devices(self):
"""Return all block devices in use on this node."""
devices = []
for guest in self._host.list_guests():
try:
doc = etree.fromstring(guest.get_xml_desc())
except libvirt.libvirtError as e:
LOG.warn(_LW("couldn't obtain the XML from domain:"
" %(uuid)s, exception: %(ex)s") %
{"uuid": guest.id, "ex": e})
continue
except Exception:
continue
sources = doc.findall("./devices/disk[@type='block']/source")
for source in sources:
devices.append(source.get('dev'))
return devices
def _get_interfaces(self, xml):
"""Note that this function takes a domain xml.
Returns a list of all network interfaces for this instance.
"""
doc = None
try:
doc = etree.fromstring(xml)
except Exception:
return []
interfaces = []
nodes = doc.findall('./devices/interface/target')
for target in nodes:
interfaces.append(target.get('dev'))
return interfaces
def _get_vcpu_total(self):
"""Get available vcpu number of physical computer.
:returns: the number of cpu core instances can be used.
"""
try:
total_pcpus = self._host.get_cpu_count()
except libvirt.libvirtError:
LOG.warn(_LW("Cannot get the number of cpu, because this "
"function is not implemented for this platform. "))
return 0
if CONF.vcpu_pin_set is None:
return total_pcpus
available_ids = hardware.get_vcpu_pin_set()
# We get the list of online CPUs on the host and see if the requested
# set falls under these. If not, we retain the old behavior.
online_pcpus = None
try:
online_pcpus = self._host.get_online_cpus()
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
LOG.warn(_LW("Couldn't retrieve the online CPUs due to a Libvirt "
"error: %(error)s with error code: %(error_code)s"),
{'error': ex, 'error_code': error_code})
if online_pcpus:
if not (available_ids <= online_pcpus):
msg = (_("Invalid vcpu_pin_set config, one or more of the "
"specified cpuset is not online. Online cpuset(s): "
"%(online)s, requested cpuset(s): %(req)s"),
{'online': sorted(online_pcpus),
'req': sorted(available_ids)})
raise exception.Invalid(msg)
elif sorted(available_ids)[-1] >= total_pcpus:
raise exception.Invalid(_("Invalid vcpu_pin_set config, "
"out of hypervisor cpu range."))
return len(available_ids)
@staticmethod
def _get_local_gb_info():
"""Get local storage info of the compute node in GB.
:returns: A dict containing:
:total: How big the overall usable filesystem is (in gigabytes)
:free: How much space is free (in gigabytes)
:used: How much space is used (in gigabytes)
"""
if CONF.libvirt.images_type == 'lvm':
info = lvm.get_volume_group_info(
CONF.libvirt.images_volume_group)
elif CONF.libvirt.images_type == 'rbd':
info = LibvirtDriver._get_rbd_driver().get_pool_info()
else:
info = libvirt_utils.get_fs_info(CONF.instances_path)
for (k, v) in six.iteritems(info):
info[k] = v / units.Gi
return info
def _get_vcpu_used(self):
"""Get vcpu usage number of physical computer.
:returns: The total number of vcpu(s) that are currently being used.
"""
total = 0
if CONF.libvirt.virt_type == 'lxc':
return total + 1
for guest in self._host.list_guests():
try:
vcpus = guest.get_vcpus_info()
if vcpus is not None:
total += len(list(vcpus))
except libvirt.libvirtError as e:
LOG.warn(_LW("couldn't obtain the vcpu count from domain id:"
" %(uuid)s, exception: %(ex)s"),
{"uuid": guest.uuid, "ex": e})
# NOTE(gtt116): give other tasks a chance.
greenthread.sleep(0)
return total
def _get_instance_capabilities(self):
"""Get hypervisor instance capabilities
Returns a list of tuples that describe instances the
hypervisor is capable of hosting. Each tuple consists
of the triplet (arch, hypervisor_type, vm_mode).
:returns: List of tuples describing instance capabilities
"""
caps = self._host.get_capabilities()
instance_caps = list()
for g in caps.guests:
for dt in g.domtype:
instance_cap = (
arch.canonicalize(g.arch),
hv_type.canonicalize(dt),
vm_mode.canonicalize(g.ostype))
instance_caps.append(instance_cap)
return instance_caps
def _get_cpu_info(self):
"""Get cpuinfo information.
Obtains cpu feature from virConnect.getCapabilities.
:return: see above description
"""
caps = self._host.get_capabilities()
cpu_info = dict()
cpu_info['arch'] = caps.host.cpu.arch
cpu_info['model'] = caps.host.cpu.model
cpu_info['vendor'] = caps.host.cpu.vendor
topology = dict()
topology['cells'] = len(getattr(caps.host.topology, 'cells', [1]))
topology['sockets'] = caps.host.cpu.sockets
topology['cores'] = caps.host.cpu.cores
topology['threads'] = caps.host.cpu.threads
cpu_info['topology'] = topology
features = set()
for f in caps.host.cpu.features:
features.add(f.name)
cpu_info['features'] = features
return cpu_info
def _get_pcidev_info(self, devname):
"""Returns a dict of PCI device."""
def _get_device_type(cfgdev, pci_address):
"""Get a PCI device's device type.
An assignable PCI device can be a normal PCI device,
a SR-IOV Physical Function (PF), or a SR-IOV Virtual
Function (VF). Only normal PCI devices or SR-IOV VFs
are assignable, while SR-IOV PFs are always owned by
hypervisor.
"""
for fun_cap in cfgdev.pci_capability.fun_capability:
if fun_cap.type == 'virt_functions':
return {
'dev_type': fields.PciDeviceType.SRIOV_PF,
}
if (fun_cap.type == 'phys_function' and
len(fun_cap.device_addrs) != 0):
phys_address = "%04x:%02x:%02x.%01x" % (
fun_cap.device_addrs[0][0],
fun_cap.device_addrs[0][1],
fun_cap.device_addrs[0][2],
fun_cap.device_addrs[0][3])
return {
'dev_type': fields.PciDeviceType.SRIOV_VF,
'parent_addr': phys_address,
}
# Note(moshele): libvirt < 1.3 reported virt_functions capability
# only when VFs are enabled. The check below is a workaround
# to get the correct report regardless of whether or not any
# VFs are enabled for the device.
if not self._host.has_min_version(
MIN_LIBVIRT_PF_WITH_NO_VFS_CAP_VERSION):
is_physical_function = pci_utils.is_physical_function(
*pci_utils.get_pci_address_fields(pci_address))
if is_physical_function:
return {'dev_type': fields.PciDeviceType.SRIOV_PF}
return {'dev_type': fields.PciDeviceType.STANDARD}
virtdev = self._host.device_lookup_by_name(devname)
xmlstr = virtdev.XMLDesc(0)
cfgdev = vconfig.LibvirtConfigNodeDevice()
cfgdev.parse_str(xmlstr)
address = "%04x:%02x:%02x.%1x" % (
cfgdev.pci_capability.domain,
cfgdev.pci_capability.bus,
cfgdev.pci_capability.slot,
cfgdev.pci_capability.function)
device = {
"dev_id": cfgdev.name,
"address": address,
"product_id": "%04x" % cfgdev.pci_capability.product_id,
"vendor_id": "%04x" % cfgdev.pci_capability.vendor_id,
}
device["numa_node"] = cfgdev.pci_capability.numa_node
# requirement by DataBase Model
device['label'] = 'label_%(vendor_id)s_%(product_id)s' % device
device.update(_get_device_type(cfgdev, address))
return device
def _get_pci_passthrough_devices(self):
"""Get host PCI devices information.
Obtains pci devices information from libvirt, and returns
as a JSON string.
Each device information is a dictionary, with mandatory keys
of 'address', 'vendor_id', 'product_id', 'dev_type', 'dev_id',
'label' and other optional device specific information.
Refer to the objects/pci_device.py for more idea of these keys.
:returns: a JSON string containaing a list of the assignable PCI
devices information
"""
# Bail early if we know we can't support `listDevices` to avoid
# repeated warnings within a periodic task
if not getattr(self, '_list_devices_supported', True):
return jsonutils.dumps([])
try:
dev_names = self._host.list_pci_devices() or []
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
if error_code == libvirt.VIR_ERR_NO_SUPPORT:
self._list_devices_supported = False
LOG.warn(_LW("URI %(uri)s does not support "
"listDevices: %(error)s"),
{'uri': self._uri(), 'error': ex})
return jsonutils.dumps([])
else:
raise
pci_info = []
for name in dev_names:
pci_info.append(self._get_pcidev_info(name))
return jsonutils.dumps(pci_info)
def _has_numa_support(self):
# This means that the host can support LibvirtConfigGuestNUMATune
# and the nodeset field in LibvirtConfigGuestMemoryBackingPage
for ver in BAD_LIBVIRT_NUMA_VERSIONS:
if self._host.has_version(ver):
if not getattr(self, '_bad_libvirt_numa_version_warn', False):
LOG.warn(_LW('You are running with libvirt version %s '
'which is known to have broken NUMA support. '
'Consider patching or updating libvirt on '
'this host if you need NUMA support.'),
self._version_to_string(ver))
self._bad_libvirt_numa_version_warn = True
return False
supported_archs = [arch.I686, arch.X86_64]
caps = self._host.get_capabilities()
return ((caps.host.cpu.arch in supported_archs) and
self._host.has_min_version(MIN_LIBVIRT_NUMA_VERSION,
MIN_QEMU_NUMA_HUGEPAGE_VERSION,
host.HV_DRIVER_QEMU))
def _has_hugepage_support(self):
# This means that the host can support multiple values for the size
# field in LibvirtConfigGuestMemoryBackingPage
supported_archs = [arch.I686, arch.X86_64]
caps = self._host.get_capabilities()
return ((caps.host.cpu.arch in supported_archs) and
self._host.has_min_version(MIN_LIBVIRT_HUGEPAGE_VERSION,
MIN_QEMU_NUMA_HUGEPAGE_VERSION,
host.HV_DRIVER_QEMU))
def _get_host_numa_topology(self):
if not self._has_numa_support():
return
caps = self._host.get_capabilities()
topology = caps.host.topology
if topology is None or not topology.cells:
return
cells = []
allowed_cpus = hardware.get_vcpu_pin_set()
online_cpus = self._host.get_online_cpus()
if allowed_cpus:
allowed_cpus &= online_cpus
else:
allowed_cpus = online_cpus
for cell in topology.cells:
cpuset = set(cpu.id for cpu in cell.cpus)
siblings = sorted(map(set,
set(tuple(cpu.siblings)
if cpu.siblings else ()
for cpu in cell.cpus)
))
cpuset &= allowed_cpus
siblings = [sib & allowed_cpus for sib in siblings]
# Filter out singles and empty sibling sets that may be left
siblings = [sib for sib in siblings if len(sib) > 1]
mempages = []
if self._has_hugepage_support():
mempages = [
objects.NUMAPagesTopology(
size_kb=pages.size,
total=pages.total,
used=0)
for pages in cell.mempages]
cell = objects.NUMACell(id=cell.id, cpuset=cpuset,
memory=cell.memory / units.Ki,
cpu_usage=0, memory_usage=0,
siblings=siblings,
pinned_cpus=set([]),
mempages=mempages)
cells.append(cell)
return objects.NUMATopology(cells=cells)
def get_all_volume_usage(self, context, compute_host_bdms):
"""Return usage info for volumes attached to vms on
a given host.
"""
vol_usage = []
for instance_bdms in compute_host_bdms:
instance = instance_bdms['instance']
for bdm in instance_bdms['instance_bdms']:
mountpoint = bdm['device_name']
if mountpoint.startswith('/dev/'):
mountpoint = mountpoint[5:]
volume_id = bdm['volume_id']
LOG.debug("Trying to get stats for the volume %s",
volume_id, instance=instance)
vol_stats = self.block_stats(instance, mountpoint)
if vol_stats:
stats = dict(volume=volume_id,
instance=instance,
rd_req=vol_stats[0],
rd_bytes=vol_stats[1],
wr_req=vol_stats[2],
wr_bytes=vol_stats[3])
LOG.debug(
"Got volume usage stats for the volume=%(volume)s,"
" rd_req=%(rd_req)d, rd_bytes=%(rd_bytes)d, "
"wr_req=%(wr_req)d, wr_bytes=%(wr_bytes)d",
stats, instance=instance)
vol_usage.append(stats)
return vol_usage
def block_stats(self, instance, disk_id):
"""Note that this function takes an instance name."""
try:
guest = self._host.get_guest(instance)
# TODO(sahid): We are converting all calls from a
# virDomain object to use nova.virt.libvirt.Guest.
# We should be able to remove domain at the end.
domain = guest._domain
return domain.blockStats(disk_id)
except libvirt.libvirtError as e:
errcode = e.get_error_code()
LOG.info(_LI('Getting block stats failed, device might have '
'been detached. Instance=%(instance_name)s '
'Disk=%(disk)s Code=%(errcode)s Error=%(e)s'),
{'instance_name': instance.name, 'disk': disk_id,
'errcode': errcode, 'e': e},
instance=instance)
except exception.InstanceNotFound:
LOG.info(_LI('Could not find domain in libvirt for instance %s. '
'Cannot get block stats for device'), instance.name,
instance=instance)
def get_console_pool_info(self, console_type):
# TODO(mdragon): console proxy should be implemented for libvirt,
# in case someone wants to use it with kvm or
# such. For now return fake data.
return {'address': '127.0.0.1',
'username': 'fakeuser',
'password': 'fakepassword'}
def refresh_security_group_rules(self, security_group_id):
self.firewall_driver.refresh_security_group_rules(security_group_id)
def refresh_instance_security_rules(self, instance):
self.firewall_driver.refresh_instance_security_rules(instance)
def get_available_resource(self, nodename):
"""Retrieve resource information.
This method is called when nova-compute launches, and
as part of a periodic task that records the results in the DB.
:param nodename: unused in this driver
:returns: dictionary containing resource info
"""
disk_info_dict = self._get_local_gb_info()
data = {}
# NOTE(dprince): calling capabilities before getVersion works around
# an initialization issue with some versions of Libvirt (1.0.5.5).
# See: https://bugzilla.redhat.com/show_bug.cgi?id=1000116
# See: https://bugs.launchpad.net/nova/+bug/1215593
data["supported_instances"] = self._get_instance_capabilities()
data["vcpus"] = self._get_vcpu_total()
data["memory_mb"] = self._host.get_memory_mb_total()
data["local_gb"] = disk_info_dict['total']
data["vcpus_used"] = self._get_vcpu_used()
data["memory_mb_used"] = self._host.get_memory_mb_used()
data["local_gb_used"] = disk_info_dict['used']
data["hypervisor_type"] = self._host.get_driver_type()
data["hypervisor_version"] = self._host.get_version()
data["hypervisor_hostname"] = self._host.get_hostname()
# TODO(berrange): why do we bother converting the
# libvirt capabilities XML into a special JSON format ?
# The data format is different across all the drivers
# so we could just return the raw capabilities XML
# which 'compare_cpu' could use directly
#
# That said, arch_filter.py now seems to rely on
# the libvirt drivers format which suggests this
# data format needs to be standardized across drivers
data["cpu_info"] = jsonutils.dumps(self._get_cpu_info())
disk_free_gb = disk_info_dict['free']
disk_over_committed = self._get_disk_over_committed_size_total()
available_least = disk_free_gb * units.Gi - disk_over_committed
data['disk_available_least'] = available_least / units.Gi
data['pci_passthrough_devices'] = \
self._get_pci_passthrough_devices()
numa_topology = self._get_host_numa_topology()
if numa_topology:
data['numa_topology'] = numa_topology._to_json()
else:
data['numa_topology'] = None
return data
def check_instance_shared_storage_local(self, context, instance):
"""Check if instance files located on shared storage.
This runs check on the destination host, and then calls
back to the source host to check the results.
:param context: security context
:param instance: nova.objects.instance.Instance object
:returns:
- tempfile: A dict containing the tempfile info on the destination
host
- None:
1. If the instance path is not existing.
2. If the image backend is shared block storage type.
"""
if self.image_backend.backend().is_shared_block_storage():
return None
dirpath = libvirt_utils.get_instance_path(instance)
if not os.path.exists(dirpath):
return None
fd, tmp_file = tempfile.mkstemp(dir=dirpath)
LOG.debug("Creating tmpfile %s to verify with other "
"compute node that the instance is on "
"the same shared storage.",
tmp_file, instance=instance)
os.close(fd)
return {"filename": tmp_file}
def check_instance_shared_storage_remote(self, context, data):
return os.path.exists(data['filename'])
def check_instance_shared_storage_cleanup(self, context, data):
fileutils.delete_if_exists(data["filename"])
def check_can_live_migrate_destination(self, context, instance,
src_compute_info, dst_compute_info,
block_migration=False,
disk_over_commit=False):
"""Check if it is possible to execute live migration.
This runs checks on the destination host, and then calls
back to the source host to check the results.
:param context: security context
:param instance: nova.db.sqlalchemy.models.Instance
:param block_migration: if true, prepare for block migration
:param disk_over_commit: if true, allow disk over commit
:returns: a LibvirtLiveMigrateData object
"""
disk_available_mb = None
if block_migration:
disk_available_gb = dst_compute_info['disk_available_least']
disk_available_mb = \
(disk_available_gb * units.Ki) - CONF.reserved_host_disk_mb
# Compare CPU
if not instance.vcpu_model or not instance.vcpu_model.model:
source_cpu_info = src_compute_info['cpu_info']
self._compare_cpu(None, source_cpu_info)
else:
self._compare_cpu(instance.vcpu_model, None)
# Create file on storage, to be checked on source host
filename = self._create_shared_storage_test_file()
data = objects.LibvirtLiveMigrateData()
data.filename = filename
data.image_type = CONF.libvirt.images_type
data.block_migration = block_migration
data.disk_over_commit = disk_over_commit
data.disk_available_mb = disk_available_mb
return data
def check_can_live_migrate_destination_cleanup(self, context,
dest_check_data):
"""Do required cleanup on dest host after check_can_live_migrate calls
:param context: security context
"""
filename = dest_check_data.filename
self._cleanup_shared_storage_test_file(filename)
def check_can_live_migrate_source(self, context, instance,
dest_check_data,
block_device_info=None):
"""Check if it is possible to execute live migration.
This checks if the live migration can succeed, based on the
results from check_can_live_migrate_destination.
:param context: security context
:param instance: nova.db.sqlalchemy.models.Instance
:param dest_check_data: result of check_can_live_migrate_destination
:param block_device_info: result of _get_instance_block_device_info
:returns: a LibvirtLiveMigrateData object
"""
# Checking shared storage connectivity
# if block migration, instances_paths should not be on shared storage.
source = CONF.host
if not isinstance(dest_check_data, migrate_data_obj.LiveMigrateData):
md_obj = objects.LibvirtLiveMigrateData()
md_obj.from_legacy_dict(dest_check_data)
dest_check_data = md_obj
dest_check_data.is_shared_instance_path = (
self._check_shared_storage_test_file(
dest_check_data.filename))
dest_check_data.is_shared_block_storage = (
self._is_shared_block_storage(instance, dest_check_data,
block_device_info))
disk_info_text = self.get_instance_disk_info(
instance, block_device_info=block_device_info)
booted_from_volume = self._is_booted_from_volume(instance,
disk_info_text)
has_local_disk = self._has_local_disk(instance, disk_info_text)
if dest_check_data.block_migration:
if (dest_check_data.is_shared_block_storage or
dest_check_data.is_shared_instance_path):
reason = _("Block migration can not be used "
"with shared storage.")
raise exception.InvalidLocalStorage(reason=reason, path=source)
self._assert_dest_node_has_enough_disk(context, instance,
dest_check_data.disk_available_mb,
dest_check_data.disk_over_commit,
block_device_info)
if block_device_info:
bdm = block_device_info.get('block_device_mapping')
# NOTE(pkoniszewski): libvirt from version 1.2.17 upwards
# supports selective block device migration. It means that it
# is possible to define subset of block devices to be copied
# during migration. If they are not specified - block devices
# won't be migrated. However, it does not work when live
# migration is tunnelled through libvirt.
if bdm and not self._host.has_min_version(
MIN_LIBVIRT_BLOCK_LM_WITH_VOLUMES_VERSION):
# NOTE(stpierre): if this instance has mapped volumes,
# we can't do a block migration, since that will result
# in volumes being copied from themselves to themselves,
# which is a recipe for disaster.
ver = ".".join([str(x) for x in
MIN_LIBVIRT_BLOCK_LM_WITH_VOLUMES_VERSION])
msg = (_('Cannot block migrate instance %(uuid)s with'
' mapped volumes. Selective block device'
' migration feature requires libvirt version'
' %(libvirt_ver)s') %
{'uuid': instance.uuid, 'libvirt_ver': ver})
LOG.error(msg, instance=instance)
raise exception.MigrationPreCheckError(reason=msg)
elif not (dest_check_data.is_shared_block_storage or
dest_check_data.is_shared_instance_path or
(booted_from_volume and not has_local_disk)):
reason = _("Live migration can not be used "
"without shared storage except "
"a booted from volume VM which "
"does not have a local disk.")
raise exception.InvalidSharedStorage(reason=reason, path=source)
# NOTE(mikal): include the instance directory name here because it
# doesn't yet exist on the destination but we want to force that
# same name to be used
instance_path = libvirt_utils.get_instance_path(instance,
relative=True)
dest_check_data.instance_relative_path = instance_path
return dest_check_data
def _is_shared_block_storage(self, instance, dest_check_data,
block_device_info=None):
"""Check if all block storage of an instance can be shared
between source and destination of a live migration.
Returns true if the instance is volume backed and has no local disks,
or if the image backend is the same on source and destination and the
backend shares block storage between compute nodes.
:param instance: nova.objects.instance.Instance object
:param dest_check_data: dict with boolean fields image_type,
is_shared_instance_path, and is_volume_backed
"""
if (dest_check_data.obj_attr_is_set('image_type') and
CONF.libvirt.images_type == dest_check_data.image_type and
self.image_backend.backend().is_shared_block_storage()):
# NOTE(dgenin): currently true only for RBD image backend
return True
if (dest_check_data.is_shared_instance_path and
self.image_backend.backend().is_file_in_instance_path()):
# NOTE(angdraug): file based image backends (Raw, Qcow2)
# place block device files under the instance path
return True
if (dest_check_data.is_volume_backed and
not bool(jsonutils.loads(
self.get_instance_disk_info(instance,
block_device_info)))):
return True
return False
def _assert_dest_node_has_enough_disk(self, context, instance,
available_mb, disk_over_commit,
block_device_info=None):
"""Checks if destination has enough disk for block migration."""
# Libvirt supports qcow2 disk format,which is usually compressed
# on compute nodes.
# Real disk image (compressed) may enlarged to "virtual disk size",
# that is specified as the maximum disk size.
# (See qemu-img -f path-to-disk)
# Scheduler recognizes destination host still has enough disk space
# if real disk size < available disk size
# if disk_over_commit is True,
# otherwise virtual disk size < available disk size.
available = 0
if available_mb:
available = available_mb * units.Mi
ret = self.get_instance_disk_info(instance,
block_device_info=block_device_info)
disk_infos = jsonutils.loads(ret)
necessary = 0
if disk_over_commit:
for info in disk_infos:
necessary += int(info['disk_size'])
else:
for info in disk_infos:
necessary += int(info['virt_disk_size'])
# Check that available disk > necessary disk
if (available - necessary) < 0:
reason = (_('Unable to migrate %(instance_uuid)s: '
'Disk of instance is too large(available'
' on destination host:%(available)s '
'< need:%(necessary)s)') %
{'instance_uuid': instance.uuid,
'available': available,
'necessary': necessary})
raise exception.MigrationPreCheckError(reason=reason)
def _compare_cpu(self, guest_cpu, host_cpu_str):
"""Check the host is compatible with the requested CPU
:param guest_cpu: nova.objects.VirtCPUModel or None
:param host_cpu_str: JSON from _get_cpu_info() method
If the 'guest_cpu' parameter is not None, this will be
validated for migration compatibility with the host.
Otherwise the 'host_cpu_str' JSON string will be used for
validation.
:returns:
None. if given cpu info is not compatible to this server,
raise exception.
"""
# NOTE(berendt): virConnectCompareCPU not working for Xen
if CONF.libvirt.virt_type not in ['qemu', 'kvm']:
return
if guest_cpu is None:
info = jsonutils.loads(host_cpu_str)
LOG.info(_LI('Instance launched has CPU info: %s'), host_cpu_str)
cpu = vconfig.LibvirtConfigCPU()
cpu.arch = info['arch']
cpu.model = info['model']
cpu.vendor = info['vendor']
cpu.sockets = info['topology']['sockets']
cpu.cores = info['topology']['cores']
cpu.threads = info['topology']['threads']
for f in info['features']:
cpu.add_feature(vconfig.LibvirtConfigCPUFeature(f))
else:
cpu = self._vcpu_model_to_cpu_config(guest_cpu)
u = ("http://libvirt.org/html/libvirt-libvirt-host.html#"
"virCPUCompareResult")
m = _("CPU doesn't have compatibility.\n\n%(ret)s\n\nRefer to %(u)s")
# unknown character exists in xml, then libvirt complains
try:
ret = self._host.compare_cpu(cpu.to_xml())
except libvirt.libvirtError as e:
error_code = e.get_error_code()
if error_code == libvirt.VIR_ERR_NO_SUPPORT:
LOG.debug("URI %(uri)s does not support cpu comparison. "
"It will be proceeded though. Error: %(error)s",
{'uri': self._uri(), 'error': e})
return
else:
LOG.error(m, {'ret': e, 'u': u})
raise exception.MigrationPreCheckError(
reason=m % {'ret': e, 'u': u})
if ret <= 0:
LOG.error(m, {'ret': ret, 'u': u})
raise exception.InvalidCPUInfo(reason=m % {'ret': ret, 'u': u})
def _create_shared_storage_test_file(self):
"""Makes tmpfile under CONF.instances_path."""
dirpath = CONF.instances_path
fd, tmp_file = tempfile.mkstemp(dir=dirpath)
LOG.debug("Creating tmpfile %s to notify to other "
"compute nodes that they should mount "
"the same storage.", tmp_file)
os.close(fd)
return os.path.basename(tmp_file)
def _check_shared_storage_test_file(self, filename):
"""Confirms existence of the tmpfile under CONF.instances_path.
Cannot confirm tmpfile return False.
"""
tmp_file = os.path.join(CONF.instances_path, filename)
if not os.path.exists(tmp_file):
return False
else:
return True
def _cleanup_shared_storage_test_file(self, filename):
"""Removes existence of the tmpfile under CONF.instances_path."""
tmp_file = os.path.join(CONF.instances_path, filename)
os.remove(tmp_file)
def ensure_filtering_rules_for_instance(self, instance, network_info):
"""Ensure that an instance's filtering rules are enabled.
When migrating an instance, we need the filtering rules to
be configured on the destination host before starting the
migration.
Also, when restarting the compute service, we need to ensure
that filtering rules exist for all running services.
"""
self.firewall_driver.setup_basic_filtering(instance, network_info)
self.firewall_driver.prepare_instance_filter(instance,
network_info)
# nwfilters may be defined in a separate thread in the case
# of libvirt non-blocking mode, so we wait for completion
timeout_count = list(range(CONF.live_migration_retry_count))
while timeout_count:
if self.firewall_driver.instance_filter_exists(instance,
network_info):
break
timeout_count.pop()
if len(timeout_count) == 0:
msg = _('The firewall filter for %s does not exist')
raise exception.NovaException(msg % instance.name)
greenthread.sleep(1)
def filter_defer_apply_on(self):
self.firewall_driver.filter_defer_apply_on()
def filter_defer_apply_off(self):
self.firewall_driver.filter_defer_apply_off()
def live_migration(self, context, instance, dest,
post_method, recover_method, block_migration=False,
migrate_data=None):
"""Spawning live_migration operation for distributing high-load.
:param context: security context
:param instance:
nova.db.sqlalchemy.models.Instance object
instance object that is migrated.
:param dest: destination host
:param post_method:
post operation method.
expected nova.compute.manager._post_live_migration.
:param recover_method:
recovery method when any exception occurs.
expected nova.compute.manager._rollback_live_migration.
:param block_migration: if true, do block migration.
:param migrate_data: a LibvirtLiveMigrateData object
"""
# 'dest' will be substituted into 'migration_uri' so ensure
# it does't contain any characters that could be used to
# exploit the URI accepted by libivrt
if not libvirt_utils.is_valid_hostname(dest):
raise exception.InvalidHostname(hostname=dest)
self._live_migration(context, instance, dest,
post_method, recover_method, block_migration,
migrate_data)
def _update_xml(self, xml_str, migrate_bdm_info, listen_addrs,
serial_listen_addr):
xml_doc = etree.fromstring(xml_str)
if migrate_bdm_info:
xml_doc = self._update_volume_xml(xml_doc, migrate_bdm_info)
if listen_addrs:
xml_doc = self._update_graphics_xml(xml_doc, listen_addrs)
else:
self._check_graphics_addresses_can_live_migrate(listen_addrs)
if serial_listen_addr:
xml_doc = self._update_serial_xml(xml_doc, serial_listen_addr)
else:
self._verify_serial_console_is_disabled()
return etree.tostring(xml_doc)
def _update_graphics_xml(self, xml_doc, listen_addrs):
# change over listen addresses
for dev in xml_doc.findall('./devices/graphics'):
gr_type = dev.get('type')
listen_tag = dev.find('listen')
if gr_type in ('vnc', 'spice'):
if listen_tag is not None:
listen_tag.set('address', listen_addrs[gr_type])
if dev.get('listen') is not None:
dev.set('listen', listen_addrs[gr_type])
return xml_doc
def _update_volume_xml(self, xml_doc, migrate_bdm_info):
"""Update XML using device information of destination host."""
# Update volume xml
parser = etree.XMLParser(remove_blank_text=True)
disk_nodes = xml_doc.findall('./devices/disk')
bdm_info_by_serial = {x.serial: x for x in migrate_bdm_info}
for pos, disk_dev in enumerate(disk_nodes):
serial_source = disk_dev.findtext('serial')
bdm_info = bdm_info_by_serial.get(serial_source)
if (serial_source is None or
not bdm_info or not bdm_info.connection_info or
serial_source not in bdm_info_by_serial):
continue
conf = self._get_volume_config(
bdm_info.connection_info, bdm_info.as_disk_info())
xml_doc2 = etree.XML(conf.to_xml(), parser)
serial_dest = xml_doc2.findtext('serial')
# Compare source serial and destination serial number.
# If these serial numbers match, continue the process.
if (serial_dest and (serial_source == serial_dest)):
LOG.debug("Find same serial number: pos=%(pos)s, "
"serial=%(num)s",
{'pos': pos, 'num': serial_source})
for cnt, item_src in enumerate(disk_dev):
# If source and destination have same item, update
# the item using destination value.
for item_dst in xml_doc2.findall(item_src.tag):
disk_dev.remove(item_src)
item_dst.tail = None
disk_dev.insert(cnt, item_dst)
# If destination has additional items, thses items should be
# added here.
for item_dst in list(xml_doc2):
item_dst.tail = None
disk_dev.insert(cnt, item_dst)
return xml_doc
def _update_serial_xml(self, xml_doc, listen_addr):
for dev in xml_doc.findall("./devices/serial[@type='tcp']/source"):
if dev.get('host') is not None:
dev.set('host', listen_addr)
for dev in xml_doc.findall("./devices/console[@type='tcp']/source"):
if dev.get('host') is not None:
dev.set('host', listen_addr)
return xml_doc
def _check_graphics_addresses_can_live_migrate(self, listen_addrs):
LOCAL_ADDRS = ('0.0.0.0', '127.0.0.1', '::', '::1')
local_vnc = CONF.vnc.vncserver_listen in LOCAL_ADDRS
local_spice = CONF.spice.server_listen in LOCAL_ADDRS
if ((CONF.vnc.enabled and not local_vnc) or
(CONF.spice.enabled and not local_spice)):
msg = _('Your libvirt version does not support the'
' VIR_DOMAIN_XML_MIGRATABLE flag or your'
' destination node does not support'
' retrieving listen addresses. In order'
' for live migration to work properly, you'
' must configure the graphics (VNC and/or'
' SPICE) listen addresses to be either'
' the catch-all address (0.0.0.0 or ::) or'
' the local address (127.0.0.1 or ::1).')
raise exception.MigrationError(reason=msg)
if listen_addrs:
dest_local_vnc = listen_addrs.get('vnc') in LOCAL_ADDRS
dest_local_spice = listen_addrs.get('spice') in LOCAL_ADDRS
if ((CONF.vnc.enabled and not dest_local_vnc) or
(CONF.spice.enabled and not dest_local_spice)):
LOG.warn(_LW('Your libvirt version does not support the'
' VIR_DOMAIN_XML_MIGRATABLE flag, and the'
' graphics (VNC and/or SPICE) listen'
' addresses on the destination node do not'
' match the addresses on the source node.'
' Since the source node has listen'
' addresses set to either the catch-all'
' address (0.0.0.0 or ::) or the local'
' address (127.0.0.1 or ::1), the live'
' migration will succeed, but the VM will'
' continue to listen on the current'
' addresses.'))
def _verify_serial_console_is_disabled(self):
if CONF.serial_console.enabled:
msg = _('Your libvirt version does not support the'
' VIR_DOMAIN_XML_MIGRATABLE flag or your'
' destination node does not support'
' retrieving listen addresses. In order'
' for live migration to work properly you'
' must either disable serial console or'
' upgrade your libvirt version.')
raise exception.MigrationError(reason=msg)
def _live_migration_operation(self, context, instance, dest,
block_migration, migrate_data, dom,
device_names):
"""Invoke the live migration operation
:param context: security context
:param instance:
nova.db.sqlalchemy.models.Instance object
instance object that is migrated.
:param dest: destination host
:param block_migration: if true, do block migration.
:param migrate_data: a LibvirtLiveMigrateData object
:param dom: the libvirt domain object
:param device_names: list of device names that are being migrated with
instance
This method is intended to be run in a background thread and will
block that thread until the migration is finished or failed.
"""
# TODO(sahid): Should pass a guest to this method.
guest = libvirt_guest.Guest(dom)
try:
if block_migration:
migration_flags = self._block_migration_flags
else:
migration_flags = self._live_migration_flags
listen_addrs = {}
if 'graphics_listen_addr_vnc' in migrate_data:
listen_addrs['vnc'] = str(
migrate_data.graphics_listen_addr_vnc)
if 'graphics_listen_addr_spice' in migrate_data:
listen_addrs['spice'] = str(
migrate_data.graphics_listen_addr_spice)
serial_listen_addr = migrate_data.serial_listen_addr
if migrate_data.target_connect_addr is not None:
dest = migrate_data.target_connect_addr
migratable_flag = getattr(libvirt, 'VIR_DOMAIN_XML_MIGRATABLE',
None)
if (migratable_flag is None or (
not listen_addrs and not migrate_data.bdms)):
# TODO(alexs-h): These checks could be moved to the
# check_can_live_migrate_destination/source phase
self._check_graphics_addresses_can_live_migrate(listen_addrs)
self._verify_serial_console_is_disabled()
dom.migrateToURI(self._live_migration_uri(dest),
migration_flags,
None,
CONF.libvirt.live_migration_bandwidth)
else:
old_xml_str = guest.get_xml_desc(dump_migratable=True)
new_xml_str = self._update_xml(old_xml_str,
migrate_data.bdms,
listen_addrs,
serial_listen_addr)
try:
if self._host.has_min_version(
MIN_LIBVIRT_BLOCK_LM_WITH_VOLUMES_VERSION):
params = {
'bandwidth': CONF.libvirt.live_migration_bandwidth,
'destination_xml': new_xml_str,
'migrate_disks': device_names,
}
dom.migrateToURI3(
self._live_migration_uri(dest),
params,
migration_flags)
else:
dom.migrateToURI2(
self._live_migration_uri(dest),
None,
new_xml_str,
migration_flags,
None,
CONF.libvirt.live_migration_bandwidth)
except libvirt.libvirtError as ex:
# NOTE(mriedem): There is a bug in older versions of
# libvirt where the VIR_DOMAIN_XML_MIGRATABLE flag causes
# virDomainDefCheckABIStability to not compare the source
# and target domain xml's correctly for the CPU model.
# We try to handle that error here and attempt the legacy
# migrateToURI path, which could fail if the console
# addresses are not correct, but in that case we have the
# _check_graphics_addresses_can_live_migrate check in place
# to catch it.
# TODO(mriedem): Remove this workaround when
# Red Hat BZ #1141838 is closed.
error_code = ex.get_error_code()
if error_code == libvirt.VIR_ERR_CONFIG_UNSUPPORTED:
LOG.warn(_LW('An error occurred trying to live '
'migrate. Falling back to legacy live '
'migrate flow. Error: %s'), ex,
instance=instance)
self._check_graphics_addresses_can_live_migrate(
listen_addrs)
self._verify_serial_console_is_disabled()
dom.migrateToURI(
self._live_migration_uri(dest),
migration_flags,
None,
CONF.libvirt.live_migration_bandwidth)
else:
raise
except Exception as e:
with excutils.save_and_reraise_exception():
LOG.error(_LE("Live Migration failure: %s"), e,
instance=instance)
# If 'migrateToURI' fails we don't know what state the
# VM instances on each host are in. Possibilities include
#
# 1. src==running, dst==none
#
# Migration failed & rolled back, or never started
#
# 2. src==running, dst==paused
#
# Migration started but is still ongoing
#
# 3. src==paused, dst==paused
#
# Migration data transfer completed, but switchover
# is still ongoing, or failed
#
# 4. src==paused, dst==running
#
# Migration data transfer completed, switchover
# happened but cleanup on source failed
#
# 5. src==none, dst==running
#
# Migration fully succeeded.
#
# Libvirt will aim to complete any migration operation
# or roll it back. So even if the migrateToURI call has
# returned an error, if the migration was not finished
# libvirt should clean up.
#
# So we take the error raise here with a pinch of salt
# and rely on the domain job info status to figure out
# what really happened to the VM, which is a much more
# reliable indicator.
#
# In particular we need to try very hard to ensure that
# Nova does not "forget" about the guest. ie leaving it
# running on a different host to the one recorded in
# the database, as that would be a serious resource leak
LOG.debug("Migration operation thread has finished",
instance=instance)
@staticmethod
def _migration_downtime_steps(data_gb):
'''Calculate downtime value steps and time between increases.
:param data_gb: total GB of RAM and disk to transfer
This looks at the total downtime steps and upper bound
downtime value and uses an exponential backoff. So initially
max downtime is increased by small amounts, and as time goes
by it is increased by ever larger amounts
For example, with 10 steps, 30 second step delay, 3 GB
of RAM and 400ms target maximum downtime, the downtime will
be increased every 90 seconds in the following progression:
- 0 seconds -> set downtime to 37ms
- 90 seconds -> set downtime to 38ms
- 180 seconds -> set downtime to 39ms
- 270 seconds -> set downtime to 42ms
- 360 seconds -> set downtime to 46ms
- 450 seconds -> set downtime to 55ms
- 540 seconds -> set downtime to 70ms
- 630 seconds -> set downtime to 98ms
- 720 seconds -> set downtime to 148ms
- 810 seconds -> set downtime to 238ms
- 900 seconds -> set downtime to 400ms
This allows the guest a good chance to complete migration
with a small downtime value.
'''
downtime = CONF.libvirt.live_migration_downtime
steps = CONF.libvirt.live_migration_downtime_steps
delay = CONF.libvirt.live_migration_downtime_delay
if downtime < LIVE_MIGRATION_DOWNTIME_MIN:
downtime = LIVE_MIGRATION_DOWNTIME_MIN
if steps < LIVE_MIGRATION_DOWNTIME_STEPS_MIN:
steps = LIVE_MIGRATION_DOWNTIME_STEPS_MIN
if delay < LIVE_MIGRATION_DOWNTIME_DELAY_MIN:
delay = LIVE_MIGRATION_DOWNTIME_DELAY_MIN
delay = int(delay * data_gb)
offset = downtime / float(steps + 1)
base = (downtime - offset) ** (1 / float(steps))
for i in range(steps + 1):
yield (int(delay * i), int(offset + base ** i))
def _live_migration_copy_disk_paths(self, context, instance, guest):
'''Get list of disks to copy during migration
:param context: security context
:param instance: the instance being migrated
:param guest: the Guest instance being migrated
Get the list of disks to copy during migration.
:returns: a list of local source paths and a list of device names to
copy
'''
disk_paths = []
device_names = []
block_devices = []
# TODO(pkoniszewski): Remove this if-statement when we bump min libvirt
# version to >= 1.2.17
if self._host.has_min_version(
MIN_LIBVIRT_BLOCK_LM_WITH_VOLUMES_VERSION):
bdm_list = objects.BlockDeviceMappingList.get_by_instance_uuid(
context, instance.uuid)
block_device_info = driver.get_block_device_info(instance,
bdm_list)
block_device_mappings = driver.block_device_info_get_mapping(
block_device_info)
for bdm in block_device_mappings:
device_name = str(bdm['mount_device'].rsplit('/', 1)[1])
block_devices.append(device_name)
for dev in guest.get_all_disks():
if dev.readonly or dev.shareable:
continue
if dev.source_type not in ["file", "block"]:
continue
if dev.target_dev in block_devices:
continue
disk_paths.append(dev.source_path)
device_names.append(dev.target_dev)
return (disk_paths, device_names)
def _live_migration_data_gb(self, instance, disk_paths):
'''Calculate total amount of data to be transferred
:param instance: the nova.objects.Instance being migrated
:param disk_paths: list of disk paths that are being migrated
with instance
Calculates the total amount of data that needs to be
transferred during the live migration. The actual
amount copied will be larger than this, due to the
guest OS continuing to dirty RAM while the migration
is taking place. So this value represents the minimal
data size possible.
:returns: data size to be copied in GB
'''
ram_gb = instance.flavor.memory_mb * units.Mi / units.Gi
if ram_gb < 2:
ram_gb = 2
disk_gb = 0
for path in disk_paths:
try:
size = os.stat(path).st_size
size_gb = (size / units.Gi)
if size_gb < 2:
size_gb = 2
disk_gb += size_gb
except OSError as e:
LOG.warn(_LW("Unable to stat %(disk)s: %(ex)s"),
{'disk': path, 'ex': e})
# Ignore error since we don't want to break
# the migration monitoring thread operation
return ram_gb + disk_gb
def _live_migration_monitor(self, context, instance, guest,
dest, post_method,
recover_method, block_migration,
migrate_data, dom, finish_event,
disk_paths):
data_gb = self._live_migration_data_gb(instance, disk_paths)
downtime_steps = list(self._migration_downtime_steps(data_gb))
completion_timeout = int(
CONF.libvirt.live_migration_completion_timeout * data_gb)
progress_timeout = CONF.libvirt.live_migration_progress_timeout
n = 0
start = time.time()
progress_time = start
progress_watermark = None
while True:
info = host.DomainJobInfo.for_domain(dom)
if info.type == libvirt.VIR_DOMAIN_JOB_NONE:
# Annoyingly this could indicate many possible
# states, so we must fix the mess:
#
# 1. Migration has not yet begun
# 2. Migration has stopped due to failure
# 3. Migration has stopped due to completion
#
# We can detect option 1 by seeing if thread is still
# running. We can distinguish 2 vs 3 by seeing if the
# VM still exists & running on the current host
#
if not finish_event.ready():
LOG.debug("Operation thread is still running",
instance=instance)
# Leave type untouched
else:
try:
if guest.is_active():
LOG.debug("VM running on src, migration failed",
instance=instance)
info.type = libvirt.VIR_DOMAIN_JOB_FAILED
else:
LOG.debug("VM is shutoff, migration finished",
instance=instance)
info.type = libvirt.VIR_DOMAIN_JOB_COMPLETED
except libvirt.libvirtError as ex:
LOG.debug("Error checking domain status %(ex)s",
ex, instance=instance)
if ex.get_error_code() == libvirt.VIR_ERR_NO_DOMAIN:
LOG.debug("VM is missing, migration finished",
instance=instance)
info.type = libvirt.VIR_DOMAIN_JOB_COMPLETED
else:
LOG.info(_LI("Error %(ex)s, migration failed"),
instance=instance)
info.type = libvirt.VIR_DOMAIN_JOB_FAILED
if info.type != libvirt.VIR_DOMAIN_JOB_NONE:
LOG.debug("Fixed incorrect job type to be %d",
info.type, instance=instance)
if info.type == libvirt.VIR_DOMAIN_JOB_NONE:
# Migration is not yet started
LOG.debug("Migration not running yet",
instance=instance)
elif info.type == libvirt.VIR_DOMAIN_JOB_UNBOUNDED:
# Migration is still running
#
# This is where we wire up calls to change live
# migration status. eg change max downtime, cancel
# the operation, change max bandwidth
now = time.time()
elapsed = now - start
abort = False
if ((progress_watermark is None) or
(progress_watermark > info.data_remaining)):
progress_watermark = info.data_remaining
progress_time = now
if (progress_timeout != 0 and
(now - progress_time) > progress_timeout):
LOG.warn(_LW("Live migration stuck for %d sec"),
(now - progress_time), instance=instance)
abort = True
if (completion_timeout != 0 and
elapsed > completion_timeout):
LOG.warn(_LW("Live migration not completed after %d sec"),
completion_timeout, instance=instance)
abort = True
if abort:
try:
dom.abortJob()
except libvirt.libvirtError as e:
LOG.warn(_LW("Failed to abort migration %s"),
e, instance=instance)
raise
# See if we need to increase the max downtime. We
# ignore failures, since we'd rather continue trying
# to migrate
if (len(downtime_steps) > 0 and
elapsed > downtime_steps[0][0]):
downtime = downtime_steps.pop(0)
LOG.info(_LI("Increasing downtime to %(downtime)d ms "
"after %(waittime)d sec elapsed time"),
{"downtime": downtime[1],
"waittime": downtime[0]},
instance=instance)
try:
dom.migrateSetMaxDowntime(downtime[1])
except libvirt.libvirtError as e:
LOG.warn(
_LW("Unable to increase max downtime to %(time)d"
"ms: %(e)s"),
{"time": downtime[1], "e": e}, instance=instance)
# We loop every 500ms, so don't log on every
# iteration to avoid spamming logs for long
# running migrations. Just once every 5 secs
# is sufficient for developers to debug problems.
# We log once every 30 seconds at info to help
# admins see slow running migration operations
# when debug logs are off.
if (n % 10) == 0:
# Ignoring memory_processed, as due to repeated
# dirtying of data, this can be way larger than
# memory_total. Best to just look at what's
# remaining to copy and ignore what's done already
#
# TODO(berrange) perhaps we could include disk
# transfer stats in the progress too, but it
# might make memory info more obscure as large
# disk sizes might dwarf memory size
remaining = 100
if info.memory_total != 0:
remaining = round(info.memory_remaining *
100 / info.memory_total)
instance.progress = 100 - remaining
instance.save()
lg = LOG.debug
if (n % 60) == 0:
lg = LOG.info
lg(_LI("Migration running for %(secs)d secs, "
"memory %(remaining)d%% remaining; "
"(bytes processed=%(processed_memory)d, "
"remaining=%(remaining_memory)d, "
"total=%(total_memory)d)"),
{"secs": n / 2, "remaining": remaining,
"processed_memory": info.memory_processed,
"remaining_memory": info.memory_remaining,
"total_memory": info.memory_total}, instance=instance)
if info.data_remaining > progress_watermark:
lg(_LI("Data remaining %(remaining)d bytes, "
"low watermark %(watermark)d bytes "
"%(last)d seconds ago"),
{"remaining": info.data_remaining,
"watermark": progress_watermark,
"last": (now - progress_time)}, instance=instance)
n = n + 1
elif info.type == libvirt.VIR_DOMAIN_JOB_COMPLETED:
# Migration is all done
LOG.info(_LI("Migration operation has completed"),
instance=instance)
post_method(context, instance, dest, block_migration,
migrate_data)
break
elif info.type == libvirt.VIR_DOMAIN_JOB_FAILED:
# Migration did not succeed
LOG.error(_LE("Migration operation has aborted"),
instance=instance)
recover_method(context, instance, dest, block_migration,
migrate_data)
break
elif info.type == libvirt.VIR_DOMAIN_JOB_CANCELLED:
# Migration was stopped by admin
LOG.warn(_LW("Migration operation was cancelled"),
instance=instance)
recover_method(context, instance, dest, block_migration,
migrate_data)
break
else:
LOG.warn(_LW("Unexpected migration job type: %d"),
info.type, instance=instance)
time.sleep(0.5)
def _live_migration(self, context, instance, dest, post_method,
recover_method, block_migration,
migrate_data):
"""Do live migration.
:param context: security context
:param instance:
nova.db.sqlalchemy.models.Instance object
instance object that is migrated.
:param dest: destination host
:param post_method:
post operation method.
expected nova.compute.manager._post_live_migration.
:param recover_method:
recovery method when any exception occurs.
expected nova.compute.manager._rollback_live_migration.
:param block_migration: if true, do block migration.
:param migrate_data: a LibvirtLiveMigrateData object
This fires off a new thread to run the blocking migration
operation, and then this thread monitors the progress of
migration and controls its operation
"""
guest = self._host.get_guest(instance)
disk_paths = []
device_names = []
if block_migration:
disk_paths, device_names = self._live_migration_copy_disk_paths(
context, instance, guest)
# TODO(sahid): We are converting all calls from a
# virDomain object to use nova.virt.libvirt.Guest.
# We should be able to remove dom at the end.
dom = guest._domain
opthread = utils.spawn(self._live_migration_operation,
context, instance, dest,
block_migration,
migrate_data, dom,
device_names)
finish_event = eventlet.event.Event()
def thread_finished(thread, event):
LOG.debug("Migration operation thread notification",
instance=instance)
event.send()
opthread.link(thread_finished, finish_event)
# Let eventlet schedule the new thread right away
time.sleep(0)
try:
LOG.debug("Starting monitoring of live migration",
instance=instance)
self._live_migration_monitor(context, instance, guest, dest,
post_method, recover_method,
block_migration, migrate_data,
dom, finish_event, disk_paths)
except Exception as ex:
LOG.warn(_LW("Error monitoring migration: %(ex)s"),
{"ex": ex}, instance=instance, exc_info=True)
raise
finally:
LOG.debug("Live migration monitoring is all done",
instance=instance)
def live_migration_force_complete(self, instance):
# NOTE(pkoniszewski): currently only pause during live migration is
# supported to force live migration to complete, so just try to pause
# the instance
self.pause(instance)
def _try_fetch_image(self, context, path, image_id, instance,
fallback_from_host=None):
try:
libvirt_utils.fetch_image(context, path,
image_id,
instance.user_id,
instance.project_id)
except exception.ImageNotFound:
if not fallback_from_host:
raise
LOG.debug("Image %(image_id)s doesn't exist anymore on "
"image service, attempting to copy image "
"from %(host)s",
{'image_id': image_id, 'host': fallback_from_host})
libvirt_utils.copy_image(src=path, dest=path,
host=fallback_from_host,
receive=True)
def _fetch_instance_kernel_ramdisk(self, context, instance,
fallback_from_host=None):
"""Download kernel and ramdisk for instance in instance directory."""
instance_dir = libvirt_utils.get_instance_path(instance)
if instance.kernel_id:
kernel_path = os.path.join(instance_dir, 'kernel')
# NOTE(dsanders): only fetch image if it's not available at
# kernel_path. This also avoids ImageNotFound exception if
# the image has been deleted from glance
if not os.path.exists(kernel_path):
self._try_fetch_image(context,
kernel_path,
instance.kernel_id,
instance, fallback_from_host)
if instance.ramdisk_id:
ramdisk_path = os.path.join(instance_dir, 'ramdisk')
# NOTE(dsanders): only fetch image if it's not available at
# ramdisk_path. This also avoids ImageNotFound exception if
# the image has been deleted from glance
if not os.path.exists(ramdisk_path):
self._try_fetch_image(context,
ramdisk_path,
instance.ramdisk_id,
instance, fallback_from_host)
def rollback_live_migration_at_destination(self, context, instance,
network_info,
block_device_info,
destroy_disks=True,
migrate_data=None):
"""Clean up destination node after a failed live migration."""
try:
self.destroy(context, instance, network_info, block_device_info,
destroy_disks, migrate_data)
finally:
# NOTE(gcb): Failed block live migration may leave instance
# directory at destination node, ensure it is always deleted.
is_shared_instance_path = True
if migrate_data:
is_shared_instance_path = migrate_data.is_shared_instance_path
if not is_shared_instance_path:
instance_dir = libvirt_utils.get_instance_path_at_destination(
instance, migrate_data)
if os.path.exists(instance_dir):
shutil.rmtree(instance_dir)
def pre_live_migration(self, context, instance, block_device_info,
network_info, disk_info, migrate_data=None):
"""Preparation live migration."""
if disk_info is not None:
disk_info = jsonutils.loads(disk_info)
# Steps for volume backed instance live migration w/o shared storage.
is_shared_block_storage = True
is_shared_instance_path = True
is_block_migration = True
if migrate_data:
if not isinstance(migrate_data, migrate_data_obj.LiveMigrateData):
obj = objects.LibvirtLiveMigrateData()
obj.from_legacy_dict(migrate_data)
migrate_data = obj
LOG.debug('migrate_data in pre_live_migration: %s', migrate_data,
instance=instance)
is_shared_block_storage = migrate_data.is_shared_block_storage
is_shared_instance_path = migrate_data.is_shared_instance_path
is_block_migration = migrate_data.block_migration
if configdrive.required_by(instance):
# NOTE(sileht): configdrive is stored into the block storage
# kvm is a block device, live migration will work
# NOTE(sileht): the configdrive is stored into a shared path
# kvm don't need to migrate it, live migration will work
# NOTE(dims): Using config drive with iso format does not work
# because of a bug in libvirt with read only devices. However
# one can use vfat as config_drive_format which works fine.
# Please see bug/1246201 for details on the libvirt bug.
if (is_shared_block_storage or
is_shared_instance_path or
CONF.config_drive_format == 'vfat'):
pass
else:
raise exception.NoLiveMigrationForConfigDriveInLibVirt()
if not is_shared_instance_path:
instance_dir = libvirt_utils.get_instance_path_at_destination(
instance, migrate_data)
if os.path.exists(instance_dir):
raise exception.DestinationDiskExists(path=instance_dir)
LOG.debug('Creating instance directory: %s', instance_dir,
instance=instance)
os.mkdir(instance_dir)
if not is_shared_block_storage:
# Ensure images and backing files are present.
LOG.debug('Checking to make sure images and backing files are '
'present before live migration.', instance=instance)
self._create_images_and_backing(
context, instance, instance_dir, disk_info,
fallback_from_host=instance.host)
if not is_block_migration:
# NOTE(angdraug): when block storage is shared between source
# and destination and instance path isn't (e.g. volume backed
# or rbd backed instance), instance path on destination has to
# be prepared
# Touch the console.log file, required by libvirt.
console_file = self._get_console_log_path(instance)
LOG.debug('Touch instance console log: %s', console_file,
instance=instance)
libvirt_utils.file_open(console_file, 'a').close()
# if image has kernel and ramdisk, just download
# following normal way.
self._fetch_instance_kernel_ramdisk(context, instance)
# Establishing connection to volume server.
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
if len(block_device_mapping):
LOG.debug('Connecting volumes before live migration.',
instance=instance)
for bdm in block_device_mapping:
connection_info = bdm['connection_info']
disk_info = blockinfo.get_info_from_bdm(
instance, CONF.libvirt.virt_type,
instance.image_meta, bdm)
self._connect_volume(connection_info, disk_info)
# We call plug_vifs before the compute manager calls
# ensure_filtering_rules_for_instance, to ensure bridge is set up
# Retry operation is necessary because continuously request comes,
# concurrent request occurs to iptables, then it complains.
LOG.debug('Plugging VIFs before live migration.', instance=instance)
max_retry = CONF.live_migration_retry_count
for cnt in range(max_retry):
try:
self.plug_vifs(instance, network_info)
break
except processutils.ProcessExecutionError:
if cnt == max_retry - 1:
raise
else:
LOG.warn(_LW('plug_vifs() failed %(cnt)d. Retry up to '
'%(max_retry)d.'),
{'cnt': cnt,
'max_retry': max_retry},
instance=instance)
greenthread.sleep(1)
# Store vncserver_listen and latest disk device info
if not migrate_data:
migrate_data = objects.LibvirtLiveMigrateData(bdms=[])
else:
migrate_data.bdms = []
migrate_data.graphics_listen_addr_vnc = CONF.vnc.vncserver_listen
migrate_data.graphics_listen_addr_spice = CONF.spice.server_listen
migrate_data.serial_listen_addr = \
CONF.serial_console.proxyclient_address
# Store live_migration_inbound_addr
migrate_data.target_connect_addr = \
CONF.libvirt.live_migration_inbound_addr
for vol in block_device_mapping:
connection_info = vol['connection_info']
if connection_info.get('serial'):
disk_info = blockinfo.get_info_from_bdm(
instance, CONF.libvirt.virt_type,
instance.image_meta, vol)
bdmi = objects.LibvirtLiveMigrateBDMInfo()
bdmi.serial = connection_info['serial']
bdmi.connection_info = connection_info
bdmi.bus = disk_info['bus']
bdmi.dev = disk_info['dev']
bdmi.type = disk_info['type']
bdmi.format = disk_info.get('format')
bdmi.boot_index = disk_info.get('boot_index')
migrate_data.bdms.append(bdmi)
return migrate_data
def _try_fetch_image_cache(self, image, fetch_func, context, filename,
image_id, instance, size,
fallback_from_host=None):
try:
image.cache(fetch_func=fetch_func,
context=context,
filename=filename,
image_id=image_id,
user_id=instance.user_id,
project_id=instance.project_id,
size=size)
except exception.ImageNotFound:
if not fallback_from_host:
raise
LOG.debug("Image %(image_id)s doesn't exist anymore "
"on image service, attempting to copy "
"image from %(host)s",
{'image_id': image_id, 'host': fallback_from_host},
instance=instance)
def copy_from_host(target, max_size):
libvirt_utils.copy_image(src=target,
dest=target,
host=fallback_from_host,
receive=True)
image.cache(fetch_func=copy_from_host,
filename=filename)
def _create_images_and_backing(self, context, instance, instance_dir,
disk_info, fallback_from_host=None):
""":param context: security context
:param instance:
nova.db.sqlalchemy.models.Instance object
instance object that is migrated.
:param instance_dir:
instance path to use, calculated externally to handle block
migrating an instance with an old style instance path
:param disk_info:
disk info specified in _get_instance_disk_info (list of dicts)
:param fallback_from_host:
host where we can retrieve images if the glance images are
not available.
"""
if not disk_info:
disk_info = []
for info in disk_info:
base = os.path.basename(info['path'])
# Get image type and create empty disk image, and
# create backing file in case of qcow2.
instance_disk = os.path.join(instance_dir, base)
if not info['backing_file'] and not os.path.exists(instance_disk):
libvirt_utils.create_image(info['type'], instance_disk,
info['virt_disk_size'])
elif info['backing_file']:
# Creating backing file follows same way as spawning instances.
cache_name = os.path.basename(info['backing_file'])
image = self.image_backend.image(instance,
instance_disk,
CONF.libvirt.images_type)
if cache_name.startswith('ephemeral'):
image.cache(fetch_func=self._create_ephemeral,
fs_label=cache_name,
os_type=instance.os_type,
filename=cache_name,
size=info['virt_disk_size'],
ephemeral_size=instance.ephemeral_gb)
elif cache_name.startswith('swap'):
inst_type = instance.get_flavor()
swap_mb = inst_type.swap
image.cache(fetch_func=self._create_swap,
filename="swap_%s" % swap_mb,
size=swap_mb * units.Mi,
swap_mb=swap_mb)
else:
self._try_fetch_image_cache(image,
libvirt_utils.fetch_image,
context, cache_name,
instance.image_ref,
instance,
info['virt_disk_size'],
fallback_from_host)
# if image has kernel and ramdisk, just download
# following normal way.
self._fetch_instance_kernel_ramdisk(
context, instance, fallback_from_host=fallback_from_host)
def post_live_migration(self, context, instance, block_device_info,
migrate_data=None):
# Disconnect from volume server
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
connector = self.get_volume_connector(instance)
volume_api = self._volume_api
for vol in block_device_mapping:
# Retrieve connection info from Cinder's initialize_connection API.
# The info returned will be accurate for the source server.
volume_id = vol['connection_info']['serial']
connection_info = volume_api.initialize_connection(context,
volume_id,
connector)
# TODO(leeantho) The following multipath_id logic is temporary
# and will be removed in the future once os-brick is updated
# to handle multipath for drivers in a more efficient way.
# For now this logic is needed to ensure the connection info
# data is correct.
# Pull out multipath_id from the bdm information. The
# multipath_id can be placed into the connection info
# because it is based off of the volume and will be the
# same on the source and destination hosts.
if 'multipath_id' in vol['connection_info']['data']:
multipath_id = vol['connection_info']['data']['multipath_id']
connection_info['data']['multipath_id'] = multipath_id
disk_dev = vol['mount_device'].rpartition("/")[2]
self._disconnect_volume(connection_info, disk_dev)
def post_live_migration_at_source(self, context, instance, network_info):
"""Unplug VIFs from networks at source.
:param context: security context
:param instance: instance object reference
:param network_info: instance network information
"""
self.unplug_vifs(instance, network_info)
def post_live_migration_at_destination(self, context,
instance,
network_info,
block_migration=False,
block_device_info=None):
"""Post operation of live migration at destination host.
:param context: security context
:param instance:
nova.db.sqlalchemy.models.Instance object
instance object that is migrated.
:param network_info: instance network information
:param block_migration: if true, post operation of block_migration.
"""
# Define migrated instance, otherwise, suspend/destroy does not work.
# In case of block migration, destination does not have
# libvirt.xml
disk_info = blockinfo.get_disk_info(
CONF.libvirt.virt_type, instance,
instance.image_meta, block_device_info)
xml = self._get_guest_xml(context, instance,
network_info, disk_info,
instance.image_meta,
block_device_info=block_device_info,
write_to_disk=True)
self._host.write_instance_config(xml)
def _get_instance_disk_info(self, instance_name, xml,
block_device_info=None):
"""Get the non-volume disk information from the domain xml
:param str instance_name: the name of the instance (domain)
:param str xml: the libvirt domain xml for the instance
:param dict block_device_info: block device info for BDMs
:returns disk_info: list of dicts with keys:
* 'type': the disk type (str)
* 'path': the disk path (str)
* 'virt_disk_size': the virtual disk size (int)
* 'backing_file': backing file of a disk image (str)
* 'disk_size': physical disk size (int)
* 'over_committed_disk_size': virt_disk_size - disk_size or 0
"""
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
volume_devices = set()
for vol in block_device_mapping:
disk_dev = vol['mount_device'].rpartition("/")[2]
volume_devices.add(disk_dev)
disk_info = []
doc = etree.fromstring(xml)
disk_nodes = doc.findall('.//devices/disk')
path_nodes = doc.findall('.//devices/disk/source')
driver_nodes = doc.findall('.//devices/disk/driver')
target_nodes = doc.findall('.//devices/disk/target')
for cnt, path_node in enumerate(path_nodes):
disk_type = disk_nodes[cnt].get('type')
path = path_node.get('file') or path_node.get('dev')
target = target_nodes[cnt].attrib['dev']
if not path:
LOG.debug('skipping disk for %s as it does not have a path',
instance_name)
continue
if disk_type not in ['file', 'block']:
LOG.debug('skipping disk because it looks like a volume', path)
continue
if target in volume_devices:
LOG.debug('skipping disk %(path)s (%(target)s) as it is a '
'volume', {'path': path, 'target': target})
continue
# get the real disk size or
# raise a localized error if image is unavailable
if disk_type == 'file':
dk_size = int(os.path.getsize(path))
elif disk_type == 'block' and block_device_info:
dk_size = lvm.get_volume_size(path)
else:
LOG.debug('skipping disk %(path)s (%(target)s) - unable to '
'determine if volume',
{'path': path, 'target': target})
continue
disk_type = driver_nodes[cnt].get('type')
if disk_type == "qcow2":
backing_file = libvirt_utils.get_disk_backing_file(path)
virt_size = disk.get_disk_size(path)
over_commit_size = int(virt_size) - dk_size
else:
backing_file = ""
virt_size = dk_size
over_commit_size = 0
disk_info.append({'type': disk_type,
'path': path,
'virt_disk_size': virt_size,
'backing_file': backing_file,
'disk_size': dk_size,
'over_committed_disk_size': over_commit_size})
return disk_info
def get_instance_disk_info(self, instance,
block_device_info=None):
try:
guest = self._host.get_guest(instance)
xml = guest.get_xml_desc()
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
LOG.warn(_LW('Error from libvirt while getting description of '
'%(instance_name)s: [Error Code %(error_code)s] '
'%(ex)s'),
{'instance_name': instance.name,
'error_code': error_code,
'ex': ex},
instance=instance)
raise exception.InstanceNotFound(instance_id=instance.uuid)
return jsonutils.dumps(
self._get_instance_disk_info(instance.name, xml,
block_device_info))
def _get_disk_over_committed_size_total(self):
"""Return total over committed disk size for all instances."""
# Disk size that all instance uses : virtual_size - disk_size
disk_over_committed_size = 0
for guest in self._host.list_guests():
try:
xml = guest.get_xml_desc()
disk_infos = self._get_instance_disk_info(guest.name, xml)
for info in disk_infos:
disk_over_committed_size += int(
info['over_committed_disk_size'])
except libvirt.libvirtError as ex:
error_code = ex.get_error_code()
LOG.warn(_LW(
'Error from libvirt while getting description of '
'%(instance_name)s: [Error Code %(error_code)s] %(ex)s'
), {'instance_name': guest.name,
'error_code': error_code,
'ex': ex})
except OSError as e:
if e.errno == errno.ENOENT:
LOG.warn(_LW('Periodic task is updating the host stat, '
'it is trying to get disk %(i_name)s, '
'but disk file was removed by concurrent '
'operations such as resize.'),
{'i_name': guest.name})
elif e.errno == errno.EACCES:
LOG.warn(_LW('Periodic task is updating the host stat, '
'it is trying to get disk %(i_name)s, '
'but access is denied. It is most likely '
'due to a VM that exists on the compute '
'node but is not managed by Nova.'),
{'i_name': guest.name})
else:
raise
except exception.VolumeBDMPathNotFound as e:
LOG.warn(_LW('Periodic task is updating the host stats, '
'it is trying to get disk info for %(i_name)s, '
'but the backing volume block device was removed '
'by concurrent operations such as resize. '
'Error: %(error)s'),
{'i_name': guest.name,
'error': e})
# NOTE(gtt116): give other tasks a chance.
greenthread.sleep(0)
return disk_over_committed_size
def unfilter_instance(self, instance, network_info):
"""See comments of same method in firewall_driver."""
self.firewall_driver.unfilter_instance(instance,
network_info=network_info)
def get_available_nodes(self, refresh=False):
return [self._host.get_hostname()]
def get_host_cpu_stats(self):
"""Return the current CPU state of the host."""
return self._host.get_cpu_stats()
def get_host_uptime(self):
"""Returns the result of calling "uptime"."""
out, err = utils.execute('env', 'LANG=C', 'uptime')
return out
def manage_image_cache(self, context, all_instances):
"""Manage the local cache of images."""
self.image_cache_manager.update(context, all_instances)
def _cleanup_remote_migration(self, dest, inst_base, inst_base_resize,
shared_storage=False):
"""Used only for cleanup in case migrate_disk_and_power_off fails."""
try:
if os.path.exists(inst_base_resize):
utils.execute('rm', '-rf', inst_base)
utils.execute('mv', inst_base_resize, inst_base)
if not shared_storage:
self._remotefs.remove_dir(dest, inst_base)
except Exception:
pass
def _is_storage_shared_with(self, dest, inst_base):
# NOTE (rmk): There are two methods of determining whether we are
# on the same filesystem: the source and dest IP are the
# same, or we create a file on the dest system via SSH
# and check whether the source system can also see it.
shared_storage = (dest == self.get_host_ip_addr())
if not shared_storage:
tmp_file = uuid.uuid4().hex + '.tmp'
tmp_path = os.path.join(inst_base, tmp_file)
try:
self._remotefs.create_file(dest, tmp_path)
if os.path.exists(tmp_path):
shared_storage = True
os.unlink(tmp_path)
else:
self._remotefs.remove_file(dest, tmp_path)
except Exception:
pass
return shared_storage
def migrate_disk_and_power_off(self, context, instance, dest,
flavor, network_info,
block_device_info=None,
timeout=0, retry_interval=0):
LOG.debug("Starting migrate_disk_and_power_off",
instance=instance)
ephemerals = driver.block_device_info_get_ephemerals(block_device_info)
# get_bdm_ephemeral_disk_size() will return 0 if the new
# instance's requested block device mapping contain no
# ephemeral devices. However, we still want to check if
# the original instance's ephemeral_gb property was set and
# ensure that the new requested flavor ephemeral size is greater
eph_size = (block_device.get_bdm_ephemeral_disk_size(ephemerals) or
instance.ephemeral_gb)
# Checks if the migration needs a disk resize down.
root_down = flavor.root_gb < instance.root_gb
ephemeral_down = flavor.ephemeral_gb < eph_size
disk_info_text = self.get_instance_disk_info(
instance, block_device_info=block_device_info)
booted_from_volume = self._is_booted_from_volume(instance,
disk_info_text)
if (root_down and not booted_from_volume) or ephemeral_down:
reason = _("Unable to resize disk down.")
raise exception.InstanceFaultRollback(
exception.ResizeError(reason=reason))
disk_info = jsonutils.loads(disk_info_text)
# NOTE(dgenin): Migration is not implemented for LVM backed instances.
if CONF.libvirt.images_type == 'lvm' and not booted_from_volume:
reason = _("Migration is not supported for LVM backed instances")
raise exception.InstanceFaultRollback(
exception.MigrationPreCheckError(reason=reason))
# copy disks to destination
# rename instance dir to +_resize at first for using
# shared storage for instance dir (eg. NFS).
inst_base = libvirt_utils.get_instance_path(instance)
inst_base_resize = inst_base + "_resize"
shared_storage = self._is_storage_shared_with(dest, inst_base)
# try to create the directory on the remote compute node
# if this fails we pass the exception up the stack so we can catch
# failures here earlier
if not shared_storage:
try:
self._remotefs.create_dir(dest, inst_base)
except processutils.ProcessExecutionError as e:
reason = _("not able to execute ssh command: %s") % e
raise exception.InstanceFaultRollback(
exception.ResizeError(reason=reason))
self.power_off(instance, timeout, retry_interval)
block_device_mapping = driver.block_device_info_get_mapping(
block_device_info)
for vol in block_device_mapping:
connection_info = vol['connection_info']
disk_dev = vol['mount_device'].rpartition("/")[2]
self._disconnect_volume(connection_info, disk_dev)
try:
utils.execute('mv', inst_base, inst_base_resize)
# if we are migrating the instance with shared storage then
# create the directory. If it is a remote node the directory
# has already been created
if shared_storage:
dest = None
utils.execute('mkdir', '-p', inst_base)
active_flavor = instance.get_flavor()
for info in disk_info:
# assume inst_base == dirname(info['path'])
img_path = info['path']
fname = os.path.basename(img_path)
from_path = os.path.join(inst_base_resize, fname)
# To properly resize the swap partition, it must be
# re-created with the proper size. This is acceptable
# because when an OS is shut down, the contents of the
# swap space are just garbage, the OS doesn't bother about
# what is in it.
# We will not copy over the swap disk here, and rely on
# finish_migration/_create_image to re-create it for us.
if not (fname == 'disk.swap' and
active_flavor.get('swap', 0) != flavor.get('swap', 0)):
on_execute = lambda process: self.job_tracker.add_job(
instance, process.pid)
on_completion = lambda process: self.job_tracker.\
remove_job(instance, process.pid)
compression = info['type'] not in NO_COMPRESSION_TYPES
libvirt_utils.copy_image(from_path, img_path, host=dest,
on_execute=on_execute,
on_completion=on_completion,
compression=compression)
except Exception:
with excutils.save_and_reraise_exception():
self._cleanup_remote_migration(dest, inst_base,
inst_base_resize,
shared_storage)
return disk_info_text
def _wait_for_running(self, instance):
state = self.get_info(instance).state
if state == power_state.RUNNING:
LOG.info(_LI("Instance running successfully."), instance=instance)
raise loopingcall.LoopingCallDone()
@staticmethod
def _disk_size_from_instance(instance, info):
"""Determines the disk size from instance properties
Returns the disk size by using the disk name to determine whether it
is a root or an ephemeral disk, then by checking properties of the
instance returns the size converted to bytes.
Returns 0 if the disk name not match (disk, disk.local).
"""
fname = os.path.basename(info['path'])
if fname == 'disk':
size = instance.root_gb
elif fname == 'disk.local':
size = instance.ephemeral_gb
else:
size = 0
return size * units.Gi
@staticmethod
def _disk_raw_to_qcow2(path):
"""Converts a raw disk to qcow2."""
path_qcow = path + '_qcow'
utils.execute('qemu-img', 'convert', '-f', 'raw',
'-O', 'qcow2', path, path_qcow)
utils.execute('mv', path_qcow, path)
@staticmethod
def _disk_qcow2_to_raw(path):
"""Converts a qcow2 disk to raw."""
path_raw = path + '_raw'
utils.execute('qemu-img', 'convert', '-f', 'qcow2',
'-O', 'raw', path, path_raw)
utils.execute('mv', path_raw, path)
def _disk_resize(self, image, size):
"""Attempts to resize a disk to size
:param image: an instance of nova.virt.image.model.Image
Attempts to resize a disk by checking the capabilities and
preparing the format, then calling disk.api.extend.
Note: Currently only support disk extend.
"""
if not isinstance(image, imgmodel.LocalFileImage):
LOG.debug("Skipping resize of non-local image")
return
# If we have a non partitioned image that we can extend
# then ensure we're in 'raw' format so we can extend file system.
converted = False
if (size and
image.format == imgmodel.FORMAT_QCOW2 and
disk.can_resize_image(image.path, size) and
disk.is_image_extendable(image)):
self._disk_qcow2_to_raw(image.path)
converted = True
image = imgmodel.LocalFileImage(image.path,
imgmodel.FORMAT_RAW)
if size:
disk.extend(image, size)
if converted:
# back to qcow2 (no backing_file though) so that snapshot
# will be available
self._disk_raw_to_qcow2(image.path)
def finish_migration(self, context, migration, instance, disk_info,
network_info, image_meta, resize_instance,
block_device_info=None, power_on=True):
LOG.debug("Starting finish_migration", instance=instance)
# resize disks. only "disk" and "disk.local" are necessary.
disk_info = jsonutils.loads(disk_info)
for info in disk_info:
size = self._disk_size_from_instance(instance, info)
if resize_instance:
image = imgmodel.LocalFileImage(info['path'],
info['type'])
self._disk_resize(image, size)
if info['type'] == 'raw' and CONF.use_cow_images:
self._disk_raw_to_qcow2(info['path'])
disk_info = blockinfo.get_disk_info(CONF.libvirt.virt_type,
instance,
image_meta,
block_device_info)
# assume _create_image do nothing if a target file exists.
self._create_image(context, instance, disk_info['mapping'],
network_info=network_info,
block_device_info=None, inject_files=False,
fallback_from_host=migration.source_compute)
xml = self._get_guest_xml(context, instance, network_info, disk_info,
image_meta,
block_device_info=block_device_info,
write_to_disk=True)
# NOTE(mriedem): vifs_already_plugged=True here, regardless of whether
# or not we've migrated to another host, because we unplug VIFs locally
# and the status change in the port might go undetected by the neutron
# L2 agent (or neutron server) so neutron may not know that the VIF was
# unplugged in the first place and never send an event.
self._create_domain_and_network(context, xml, instance, network_info,
disk_info,
block_device_info=block_device_info,
power_on=power_on,
vifs_already_plugged=True)
if power_on:
timer = loopingcall.FixedIntervalLoopingCall(
self._wait_for_running,
instance)
timer.start(interval=0.5).wait()
LOG.debug("finish_migration finished successfully.", instance=instance)
def _cleanup_failed_migration(self, inst_base):
"""Make sure that a failed migrate doesn't prevent us from rolling
back in a revert.
"""
try:
shutil.rmtree(inst_base)
except OSError as e:
if e.errno != errno.ENOENT:
raise
def finish_revert_migration(self, context, instance, network_info,
block_device_info=None, power_on=True):
LOG.debug("Starting finish_revert_migration",
instance=instance)
inst_base = libvirt_utils.get_instance_path(instance)
inst_base_resize = inst_base + "_resize"
# NOTE(danms): if we're recovering from a failed migration,
# make sure we don't have a left-over same-host base directory
# that would conflict. Also, don't fail on the rename if the
# failure happened early.
if os.path.exists(inst_base_resize):
self._cleanup_failed_migration(inst_base)
utils.execute('mv', inst_base_resize, inst_base)
backend = self.image_backend.image(instance, 'disk')
# Once we rollback, the snapshot is no longer needed, so remove it
# TODO(nic): Remove the try/except/finally in a future release
# To avoid any upgrade issues surrounding instances being in pending
# resize state when the software is updated, this portion of the
# method logs exceptions rather than failing on them. Once it can be
# reasonably assumed that no such instances exist in the wild
# anymore, the try/except/finally should be removed,
# and ignore_errors should be set back to False (the default) so
# that problems throw errors, like they should.
try:
backend.rollback_to_snap(libvirt_utils.RESIZE_SNAPSHOT_NAME)
except exception.SnapshotNotFound:
LOG.warning(_LW("Failed to rollback snapshot (%s)"),
libvirt_utils.RESIZE_SNAPSHOT_NAME)
finally:
backend.remove_snap(libvirt_utils.RESIZE_SNAPSHOT_NAME,
ignore_errors=True)
disk_info = blockinfo.get_disk_info(CONF.libvirt.virt_type,
instance,
instance.image_meta,
block_device_info)
xml = self._get_guest_xml(context, instance, network_info, disk_info,
instance.image_meta,
block_device_info=block_device_info)
self._create_domain_and_network(context, xml, instance, network_info,
disk_info,
block_device_info=block_device_info,
power_on=power_on,
vifs_already_plugged=True)
if power_on:
timer = loopingcall.FixedIntervalLoopingCall(
self._wait_for_running,
instance)
timer.start(interval=0.5).wait()
LOG.debug("finish_revert_migration finished successfully.",
instance=instance)
def confirm_migration(self, migration, instance, network_info):
"""Confirms a resize, destroying the source VM."""
self._cleanup_resize(instance, network_info)
@staticmethod
def _get_io_devices(xml_doc):
"""get the list of io devices from the xml document."""
result = {"volumes": [], "ifaces": []}
try:
doc = etree.fromstring(xml_doc)
except Exception:
return result
blocks = [('./devices/disk', 'volumes'),
('./devices/interface', 'ifaces')]
for block, key in blocks:
section = doc.findall(block)
for node in section:
for child in node.getchildren():
if child.tag == 'target' and child.get('dev'):
result[key].append(child.get('dev'))
return result
def get_diagnostics(self, instance):
guest = self._host.get_guest(instance)
# TODO(sahid): We are converting all calls from a
# virDomain object to use nova.virt.libvirt.Guest.
# We should be able to remove domain at the end.
domain = guest._domain
output = {}
# get cpu time, might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
try:
for vcpu in guest.get_vcpus_info():
output["cpu" + str(vcpu.id) + "_time"] = vcpu.time
except libvirt.libvirtError:
pass
# get io status
xml = guest.get_xml_desc()
dom_io = LibvirtDriver._get_io_devices(xml)
for guest_disk in dom_io["volumes"]:
try:
# blockStats might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
stats = domain.blockStats(guest_disk)
output[guest_disk + "_read_req"] = stats[0]
output[guest_disk + "_read"] = stats[1]
output[guest_disk + "_write_req"] = stats[2]
output[guest_disk + "_write"] = stats[3]
output[guest_disk + "_errors"] = stats[4]
except libvirt.libvirtError:
pass
for interface in dom_io["ifaces"]:
try:
# interfaceStats might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
stats = domain.interfaceStats(interface)
output[interface + "_rx"] = stats[0]
output[interface + "_rx_packets"] = stats[1]
output[interface + "_rx_errors"] = stats[2]
output[interface + "_rx_drop"] = stats[3]
output[interface + "_tx"] = stats[4]
output[interface + "_tx_packets"] = stats[5]
output[interface + "_tx_errors"] = stats[6]
output[interface + "_tx_drop"] = stats[7]
except libvirt.libvirtError:
pass
output["memory"] = domain.maxMemory()
# memoryStats might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
try:
mem = domain.memoryStats()
for key in mem.keys():
output["memory-" + key] = mem[key]
except (libvirt.libvirtError, AttributeError):
pass
return output
def get_instance_diagnostics(self, instance):
guest = self._host.get_guest(instance)
# TODO(sahid): We are converting all calls from a
# virDomain object to use nova.virt.libvirt.Guest.
# We should be able to remove domain at the end.
domain = guest._domain
xml = guest.get_xml_desc()
xml_doc = etree.fromstring(xml)
# TODO(sahid): Needs to use get_info but more changes have to
# be done since a mapping STATE_MAP LIBVIRT_POWER_STATE is
# needed.
(state, max_mem, mem, num_cpu, cpu_time) = \
guest._get_domain_info(self._host)
config_drive = configdrive.required_by(instance)
launched_at = timeutils.normalize_time(instance.launched_at)
uptime = timeutils.delta_seconds(launched_at,
timeutils.utcnow())
diags = diagnostics.Diagnostics(state=power_state.STATE_MAP[state],
driver='libvirt',
config_drive=config_drive,
hypervisor_os='linux',
uptime=uptime)
diags.memory_details.maximum = max_mem / units.Mi
diags.memory_details.used = mem / units.Mi
# get cpu time, might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
try:
for vcpu in guest.get_vcpus_info():
diags.add_cpu(time=vcpu.time)
except libvirt.libvirtError:
pass
# get io status
dom_io = LibvirtDriver._get_io_devices(xml)
for guest_disk in dom_io["volumes"]:
try:
# blockStats might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
stats = domain.blockStats(guest_disk)
diags.add_disk(read_bytes=stats[1],
read_requests=stats[0],
write_bytes=stats[3],
write_requests=stats[2])
except libvirt.libvirtError:
pass
for interface in dom_io["ifaces"]:
try:
# interfaceStats might launch an exception if the method
# is not supported by the underlying hypervisor being
# used by libvirt
stats = domain.interfaceStats(interface)
diags.add_nic(rx_octets=stats[0],
rx_errors=stats[2],
rx_drop=stats[3],
rx_packets=stats[1],
tx_octets=stats[4],
tx_errors=stats[6],
tx_drop=stats[7],
tx_packets=stats[5])
except libvirt.libvirtError:
pass
# Update mac addresses of interface if stats have been reported
if diags.nic_details:
nodes = xml_doc.findall('./devices/interface/mac')
for index, node in enumerate(nodes):
diags.nic_details[index].mac_address = node.get('address')
return diags
def instance_on_disk(self, instance):
# ensure directories exist and are writable
instance_path = libvirt_utils.get_instance_path(instance)
LOG.debug('Checking instance files accessibility %s', instance_path,
instance=instance)
shared_instance_path = os.access(instance_path, os.W_OK)
# NOTE(flwang): For shared block storage scenario, the file system is
# not really shared by the two hosts, but the volume of evacuated
# instance is reachable.
shared_block_storage = (self.image_backend.backend().
is_shared_block_storage())
return shared_instance_path or shared_block_storage
def inject_network_info(self, instance, nw_info):
self.firewall_driver.setup_basic_filtering(instance, nw_info)
def delete_instance_files(self, instance):
target = libvirt_utils.get_instance_path(instance)
# A resize may be in progress
target_resize = target + '_resize'
# Other threads may attempt to rename the path, so renaming the path
# to target + '_del' (because it is atomic) and iterating through
# twice in the unlikely event that a concurrent rename occurs between
# the two rename attempts in this method. In general this method
# should be fairly thread-safe without these additional checks, since
# other operations involving renames are not permitted when the task
# state is not None and the task state should be set to something
# other than None by the time this method is invoked.
target_del = target + '_del'
for i in six.moves.range(2):
try:
utils.execute('mv', target, target_del)
break
except Exception:
pass
try:
utils.execute('mv', target_resize, target_del)
break
except Exception:
pass
# Either the target or target_resize path may still exist if all
# rename attempts failed.
remaining_path = None
for p in (target, target_resize):
if os.path.exists(p):
remaining_path = p
break
# A previous delete attempt may have been interrupted, so target_del
# may exist even if all rename attempts during the present method
# invocation failed due to the absence of both target and
# target_resize.
if not remaining_path and os.path.exists(target_del):
self.job_tracker.terminate_jobs(instance)
LOG.info(_LI('Deleting instance files %s'), target_del,
instance=instance)
remaining_path = target_del
try:
shutil.rmtree(target_del)
except OSError as e:
LOG.error(_LE('Failed to cleanup directory %(target)s: '
'%(e)s'), {'target': target_del, 'e': e},
instance=instance)
# It is possible that the delete failed, if so don't mark the instance
# as cleaned.
if remaining_path and os.path.exists(remaining_path):
LOG.info(_LI('Deletion of %s failed'), remaining_path,
instance=instance)
return False
LOG.info(_LI('Deletion of %s complete'), target_del, instance=instance)
return True
@property
def need_legacy_block_device_info(self):
return False
def default_root_device_name(self, instance, image_meta, root_bdm):
disk_bus = blockinfo.get_disk_bus_for_device_type(
instance, CONF.libvirt.virt_type, image_meta, "disk")
cdrom_bus = blockinfo.get_disk_bus_for_device_type(
instance, CONF.libvirt.virt_type, image_meta, "cdrom")
root_info = blockinfo.get_root_info(
instance, CONF.libvirt.virt_type, image_meta,
root_bdm, disk_bus, cdrom_bus)
return block_device.prepend_dev(root_info['dev'])
def default_device_names_for_instance(self, instance, root_device_name,
*block_device_lists):
block_device_mapping = list(itertools.chain(*block_device_lists))
# NOTE(ndipanov): Null out the device names so that blockinfo code
# will assign them
for bdm in block_device_mapping:
if bdm.device_name is not None:
LOG.warn(_LW("Ignoring supplied device name: %(device_name)s. "
"Libvirt can't honour user-supplied dev names"),
{'device_name': bdm.device_name}, instance=instance)
bdm.device_name = None
block_device_info = driver.get_block_device_info(instance,
block_device_mapping)
blockinfo.default_device_names(CONF.libvirt.virt_type,
nova_context.get_admin_context(),
instance,
block_device_info,
instance.image_meta)
def get_device_name_for_instance(self, instance, bdms, block_device_obj):
block_device_info = driver.get_block_device_info(instance, bdms)
instance_info = blockinfo.get_disk_info(
CONF.libvirt.virt_type, instance,
instance.image_meta, block_device_info=block_device_info)
suggested_dev_name = block_device_obj.device_name
if suggested_dev_name is not None:
LOG.warn(_LW('Ignoring supplied device name: %(suggested_dev)s'),
{'suggested_dev': suggested_dev_name}, instance=instance)
# NOTE(ndipanov): get_info_from_bdm will generate the new device name
# only when it's actually not set on the bd object
block_device_obj.device_name = None
disk_info = blockinfo.get_info_from_bdm(
instance, CONF.libvirt.virt_type, instance.image_meta,
block_device_obj, mapping=instance_info['mapping'])
return block_device.prepend_dev(disk_info['dev'])
def is_supported_fs_format(self, fs_type):
return fs_type in [disk.FS_FORMAT_EXT2, disk.FS_FORMAT_EXT3,
disk.FS_FORMAT_EXT4, disk.FS_FORMAT_XFS]
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