646 lines
24 KiB
Python
646 lines
24 KiB
Python
# Copyright 2012 Anton Beloglazov
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#
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# Licensed under the Apache License, Version 2.0 (the "License");
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# you may not use this file except in compliance with the License.
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# You may obtain a copy of the License at
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#
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# http://www.apache.org/licenses/LICENSE-2.0
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#
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# Unless required by applicable law or agreed to in writing, software
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# distributed under the License is distributed on an "AS IS" BASIS,
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# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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# See the License for the specific language governing permissions and
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# limitations under the License.
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"""The main global manager module.
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The global manager is deployed on the management host and is
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responsible for making VM placement decisions and initiating VM
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migrations. It exposes a REST web service, which accepts requests from
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local managers. The global manager processes only one type of requests
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-- reallocation of a set of VM instances. Once a request is received,
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the global manager invokes a VM placement algorithm to determine
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destination hosts to migrate the VMs to. Once a VM placement is
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determined, the global manager submits a request to the Nova API to
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migrate the VMs. The global manager is also responsible for switching
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idle hosts to the sleep mode, as well as re-activating hosts when
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necessary.
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The global manager is agnostic of a particular implementation of the
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VM placement algorithm in use. The VM placement algorithm to use can
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be specified in the configuration file using the
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`algorithm_vm_placement_factory` option. A VM placement algorithm can
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call the Nova API to obtain the information about host characteristics
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and current VM placement. If necessary, it can also query the central
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database to obtain the historical information about the resource usage
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by the VMs.
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The global manager component provides a REST web service implemented
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using the Bottle framework. The authentication is done using the admin
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credentials specified in the configuration file. Upon receiving a
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request from a local manager, the following steps will be performed:
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1. Parse the `vm_uuids` parameter and transform it into a list of
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UUIDs of the VMs to migrate.
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2. Call the Nova API to obtain the current placement of VMs on the
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hosts.
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3. Call the function specified in the `algorithm_vm_placement_factory`
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configuration option and pass the UUIDs of the VMs to migrate and
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the current VM placement as arguments.
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4. Call the Nova API to migrate the VMs according to the placement
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determined by the `algorithm_vm_placement_factory` algorithm.
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When a host needs to be switched to the sleep mode, the global manager
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will use the account credentials from the `compute_user` and
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`compute_password` configuration options to open an SSH connection
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with the target host and then invoke the command specified in the
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`sleep_command`, which defaults to `pm-suspend`.
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When a host needs to be re-activated from the sleep mode, the global
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manager will leverage the Wake-on-LAN technology and send a magic
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packet to the target host using the `ether-wake` program and passing
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the corresponding MAC address as an argument. The mapping between the
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IP addresses of the hosts and their MAC addresses is initialized in
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the beginning of the global manager's execution.
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"""
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from hashlib import sha1
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import platform
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import subprocess
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import time
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import novaclient
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from novaclient.v2 import client
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from oslo_config import cfg
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from oslo_log import log as logging
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from terracotta import common
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from terracotta.utils import db_utils
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dist = platform.linux_distribution(full_distribution_name=0)[0]
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if dist in ['redhat', 'centos']:
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etherwake = 'ether-wake'
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else:
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etherwake = 'etherwake'
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global_mgr_ops = [
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cfg.StrOpt('os_admin_user',
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default='admin',
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help='The admin user name for authentication '
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'with Nova using Keystone.'),
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cfg.StrOpt('os_admin_password',
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default='admin',
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help='The admin user password for authentication '
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'with Nova using Keystone.'),
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]
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LOG = logging.getLogger(__name__)
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CONF = cfg.CONF
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CONF.register_opts(global_mgr_ops)
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def host_mac(host):
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"""Get mac address of a host.
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:param host: A host name.
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:return: The mac address of the host.
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"""
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mac = subprocess.Popen(
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("ping -c 1 {0} > /dev/null;" +
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"arp -a {0} | awk '{{print $4}}'").format(host),
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stdout=subprocess.PIPE,
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shell=True).communicate()[0].strip()
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if len(mac) != 17:
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LOG.warning('Received a wrong mac address for %s: %s',
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host, mac)
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return ''
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return mac
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def flavors_ram(nova):
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"""Get a dict of flavor IDs to the RAM limits.
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:param nova: A Nova client.
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:return: A dict of flavor IDs to the RAM limits.
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"""
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return dict((str(fl.id), fl.ram) for fl in nova.flavors.list())
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def vms_ram_limit(nova, vms):
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"""Get the RAM limit from the flavors of the VMs.
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:param nova: A Nova client.
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:param vms: A list of VM UUIDs.
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:return: A dict of VM UUIDs to the RAM limits.
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"""
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flavors_to_ram = flavors_ram(nova)
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vms_ram = {}
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for uuid in vms:
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try:
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vm = nova.servers.get(uuid)
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vms_ram[uuid] = flavors_to_ram[vm.flavor['id']]
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except novaclient.exceptions.NotFound:
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pass
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return vms_ram
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def host_used_ram(nova, host):
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"""Get the used RAM of the host using the Nova API.
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:param nova: A Nova client.
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:param host: A host name.
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:return: The used RAM of the host.
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"""
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data = nova.hosts.get(host)
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if len(data) > 2 and data[2].memory_mb != 0:
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return data[2].memory_mb
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return data[1].memory_mb
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def vms_by_hosts(nova, hosts):
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"""Get a map of host names to VMs using the Nova API.
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:param nova: A Nova client.
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:param hosts: A list of host names.
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:return: A dict of host names to lists of VM UUIDs.
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"""
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result = dict((host, []) for host in hosts)
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for vm in nova.servers.list():
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result[vm_hostname(vm)].append(str(vm.id))
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return result
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def vms_by_host(nova, host):
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"""Get VMs from the specified host using the Nova API.
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:param nova: A Nova client.
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:param host: A host name.
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:return: A list of VM UUIDs from the specified host.
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"""
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return [str(vm.id) for vm in nova.servers.list()
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if (vm_hostname(vm) == host and str(getattr(
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vm, 'OS-EXT-STS:vm_state')) == 'active')]
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def vm_hostname(vm):
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"""Get the name of the host where VM is running.
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:param vm: A Nova VM object.
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:return: The hostname.
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"""
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return str(vm.get('OS-EXT-SRV-ATTR:host'))
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def migrate_vms(db, nova, vm_instance_directory, placement, block_migration):
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"""Synchronously live migrate a set of VMs.
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:param db: The database object.
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:param nova: A Nova client.
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:param vm_instance_directory: The VM instance directory.
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:param placement: A dict of VM UUIDs to host names.
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:param block_migration: Whether to use block migration.
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"""
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retry_placement = {}
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vms = placement.keys()
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# Migrate only 2 VMs at a time, as otherwise migrations may fail
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# vm_pairs = [vms[x:x + 2] for x in xrange(0, len(vms), 2)]
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# Temporary migrates VMs one by one
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vm_pairs = [vms[x:x + 1] for x in xrange(0, len(vms), 1)]
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for vm_pair in vm_pairs:
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start_time = time.time()
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for vm_uuid in vm_pair:
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migrate_vm(nova, vm_instance_directory, vm_uuid,
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placement[vm_uuid], block_migration)
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time.sleep(10)
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while True:
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for vm_uuid in list(vm_pair):
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vm = nova.servers.get(vm_uuid)
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LOG.debug('VM %s: %s, %s',
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vm_uuid,
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vm_hostname(vm),
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vm.status)
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if vm_hostname(vm) == placement[vm_uuid] and \
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vm.status == u'ACTIVE':
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vm_pair.remove(vm_uuid)
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db.insert_vm_migration(vm_uuid, placement[vm_uuid])
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LOG.info('Completed migration of VM %s to %s',
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vm_uuid, placement[vm_uuid])
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elif time.time() - start_time > 300 and vm_hostname(
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vm) != placement[vm_uuid] and vm.status == u'ACTIVE':
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vm_pair.remove(vm_uuid)
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retry_placement[vm_uuid] = placement[vm_uuid]
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LOG.warning('Time-out for migration of VM %s to %s, ' +
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'will retry', vm_uuid, placement[vm_uuid])
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else:
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break
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else:
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break
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time.sleep(3)
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if retry_placement:
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LOG.info('Retrying the following migrations: %s',
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str(retry_placement))
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migrate_vms(db, nova, vm_instance_directory,
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retry_placement, block_migration)
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def migrate_vm(nova, vm_instance_directory, vm, host, block_migration):
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"""Live migrate a VM.
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:param nova: A Nova client.
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:param vm_instance_directory: The VM instance directory.
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:param vm: The UUID of a VM to migrate.
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:param host: The name of the destination host.
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:param block_migration: Whether to use block migration.
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"""
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# To avoid problems with migration, need the following:
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subprocess.call('chown -R nova:nova ' + vm_instance_directory,
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shell=True)
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nova.servers.live_migrate(vm, host, block_migration, False)
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LOG.info('Started migration of VM %s to %s', vm, host)
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def switch_hosts_off(db, sleep_command, hosts):
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"""Switch hosts to a low-power mode.
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:param db: The database object.
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:param sleep_command: A Shell command to switch off a host.
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:param hosts: A list of hosts to switch off.
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"""
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if sleep_command:
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for host in hosts:
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command = 'ssh {0} "{1}"'.format(host, sleep_command)
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LOG.debug('Calling: %s', command)
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subprocess.call(command, shell=True)
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LOG.info('Switched off hosts: %s', str(hosts))
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db.insert_host_states(dict((x, 0) for x in hosts))
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class GlobalManager(object):
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def __init__(self, *args, **kwargs):
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self.state = self.init_state()
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self.switch_hosts_on(self.state['compute_hosts'])
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def init_state(self):
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"""Initialize a dict for storing the state of the global manager.
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"""
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return {'previous_time': 0,
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'db': db_utils.init_db(),
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'nova': client.Client(2,
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CONF.os_admin_user,
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CONF.os_admin_password,
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CONF.global_manager.os_admin_tenant_name,
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CONF.global_manager.os_auth_url,
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service_type="compute"),
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'hashed_username': sha1(CONF.os_admin_user).hexdigest(),
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'hashed_password': sha1(CONF.os_admin_password).hexdigest(),
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'compute_hosts': CONF.global_manager.compute_hosts,
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'host_macs': {}}
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def switch_hosts_on(self, hosts):
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"""Switch hosts to the active mode.
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"""
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for host in hosts:
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if host not in self.state['host_macs']:
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self.state['host_macs'][host] = host_mac(host)
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command = '{0} -i {1} {2}'.format(
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etherwake,
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CONF.global_manager.ether_wake_interface,
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self.state['host_macs'][host])
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LOG.debug('Calling: %s', command)
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subprocess.call(command, shell=True)
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LOG.info('Switched on hosts: %s', str(hosts))
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self.state['db'].insert_host_states(
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dict((x, 1) for x in hosts))
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def execute_underload(self, host):
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"""Process an underloaded host: migrate all VMs from the host.
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1. Prepare the data about the current states of the hosts and VMs.
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2. Call the function specified in the `algorithm_vm_placement_factory`
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configuration option and pass the data on the states of the hosts
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and VMs.
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3. Call the Nova API to migrate the VMs according to the placement
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determined by the `algorithm_vm_placement_factory` algorithm.
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4. Switch off the host at the end of the VM migration.
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:param host: A host name.
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:return: The updated state dictionary.
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"""
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LOG.info('Started processing an underload request')
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underloaded_host = host
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hosts_cpu_total, _, hosts_ram_total = self.state[
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'db'].select_host_characteristics()
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hosts_to_vms = vms_by_hosts(self.state['nova'],
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self.state['compute_hosts'])
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vms_last_cpu = self.state['db'].select_last_cpu_mhz_for_vms()
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hosts_last_cpu = self.state['db'].select_last_cpu_mhz_for_hosts()
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# Remove VMs from hosts_to_vms that are not in vms_last_cpu
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# These VMs are new and no data have been collected from them
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for host, vms in hosts_to_vms.items():
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for i, vm in enumerate(vms):
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if vm not in vms_last_cpu:
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del hosts_to_vms[host][i]
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LOG.debug('hosts_to_vms: %s', str(hosts_to_vms))
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hosts_cpu_usage = {}
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hosts_ram_usage = {}
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hosts_to_keep_active = set()
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for host, vms in hosts_to_vms.items():
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if vms:
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host_cpu_mhz = hosts_last_cpu[host]
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for vm in vms:
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if vm not in vms_last_cpu:
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LOG.info('No data yet for VM: %s - skipping host %s',
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vm,
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host)
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hosts_to_keep_active.add(host)
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hosts_cpu_total.pop(host, None)
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hosts_ram_total.pop(host, None)
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hosts_cpu_usage.pop(host, None)
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hosts_ram_usage.pop(host, None)
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break
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host_cpu_mhz += vms_last_cpu[vm]
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else:
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hosts_cpu_usage[host] = host_cpu_mhz
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hosts_ram_usage[host] = host_used_ram(
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self.state['nova'], host)
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else:
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# Exclude inactive hosts
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hosts_cpu_total.pop(host, None)
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hosts_ram_total.pop(host, None)
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LOG.debug('Host CPU usage: %s', str(hosts_last_cpu))
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LOG.debug('Host total CPU usage: %s', str(hosts_cpu_usage))
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# Exclude the underloaded host
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hosts_cpu_usage.pop(underloaded_host, None)
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hosts_cpu_total.pop(underloaded_host, None)
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hosts_ram_usage.pop(underloaded_host, None)
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hosts_ram_total.pop(underloaded_host, None)
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LOG.debug('Excluded the underloaded host %s', underloaded_host)
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LOG.debug('Host CPU usage: %s', str(hosts_last_cpu))
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LOG.debug('Host total CPU usage: %s', str(hosts_cpu_usage))
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vms_to_migrate = vms_by_host(self.state['nova'], underloaded_host)
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vms_cpu = {}
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for vm in vms_to_migrate:
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if vm not in vms_last_cpu:
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LOG.info('No data yet for VM: %s - dropping the request',
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vm)
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LOG.info('Skipped an underload request')
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return self.state
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vms_cpu[vm] = self.state['db'].select_cpu_mhz_for_vm(
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vm,
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CONF.data_collector_data_length)
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vms_ram = vms_ram_limit(self.state['nova'], vms_to_migrate)
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# Remove VMs that are not in vms_ram
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# These instances might have been deleted
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for i, vm in enumerate(vms_to_migrate):
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if vm not in vms_ram:
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del vms_to_migrate[i]
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if not vms_to_migrate:
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LOG.info('No VMs to migrate - completed the underload request')
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return self.state
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for vm in vms_cpu.keys():
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if vm not in vms_ram:
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del vms_cpu[vm]
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time_step = CONF.data_collector_interval
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migration_time = common.calculate_migration_time(
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vms_ram,
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CONF.network_migration_bandwidth)
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if 'vm_placement' not in self.state:
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vm_placement_params = common.parse_parameters(
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CONF.global_manager.algorithm_vm_placement_parameters)
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vm_placement_state = None
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vm_placement = common.call_function_by_name(
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CONF.global_manager.algorithm_vm_placement_factory,
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[time_step,
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migration_time,
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vm_placement_params])
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self.state['vm_placement'] = vm_placement
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self.state['vm_placement_state'] = {}
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else:
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vm_placement = self.state['vm_placement']
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vm_placement_state = self.state['vm_placement_state']
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LOG.info('Started underload VM placement')
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placement, vm_placement_state = vm_placement(
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hosts_cpu_usage, hosts_cpu_total,
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hosts_ram_usage, hosts_ram_total,
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{}, {},
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vms_cpu, vms_ram,
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vm_placement_state)
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LOG.info('Completed underload VM placement')
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self.state['vm_placement_state'] = vm_placement_state
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LOG.info('Underload: obtained a new placement %s', str(placement))
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active_hosts = hosts_cpu_total.keys()
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inactive_hosts = set(self.state['compute_hosts']) - set(active_hosts)
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prev_inactive_hosts = set(self.state['db'].select_inactive_hosts())
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hosts_to_deactivate = list(
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inactive_hosts - prev_inactive_hosts - hosts_to_keep_active)
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if not placement:
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LOG.info('Nothing to migrate')
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if underloaded_host in hosts_to_deactivate:
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hosts_to_deactivate.remove(underloaded_host)
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else:
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LOG.info('Started underload VM migrations')
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migrate_vms(self.state['db'],
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self.state['nova'],
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CONF.global_manager.vm_instance_directory,
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placement,
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CONF.global_manager.block_migration)
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LOG.info('Completed underload VM migrations')
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if hosts_to_deactivate:
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switch_hosts_off(self.state['db'],
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CONF.global_manager.sleep_command,
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hosts_to_deactivate)
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LOG.info('Completed processing an underload request')
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return self.state
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def execute_overload(self, host, vm_uuids):
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"""Process an overloaded host: migrate the selected VMs from it.
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1. Prepare the data about the current states of the hosts and VMs.
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|
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2. Call the function specified in the `algorithm_vm_placement_factory`
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configuration option and pass the data on the states of the hosts
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and VMs.
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3. Call the Nova API to migrate the VMs according to the placement
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determined by the `algorithm_vm_placement_factory` algorithm.
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4. Switch on the inactive hosts required to accommodate the VMs.
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"""
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LOG.info('Started processing an overload request')
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overloaded_host = host
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hosts_cpu_total, _, hosts_ram_total = self.state[
|
|
'db'].select_host_characteristics()
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hosts_to_vms = vms_by_hosts(self.state['nova'],
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self.state['compute_hosts'])
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vms_last_cpu = self.state['db'].select_last_cpu_mhz_for_vms()
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hosts_last_cpu = self.state['db'].select_last_cpu_mhz_for_hosts()
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# Remove VMs from hosts_to_vms that are not in vms_last_cpu
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# These VMs are new and no data have been collected from them
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for host, vms in hosts_to_vms.items():
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for i, vm in enumerate(vms):
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if vm not in vms_last_cpu:
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del hosts_to_vms[host][i]
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|
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hosts_cpu_usage = {}
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hosts_ram_usage = {}
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inactive_hosts_cpu = {}
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inactive_hosts_ram = {}
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for host, vms in hosts_to_vms.items():
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if vms:
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host_cpu_mhz = hosts_last_cpu[host]
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for vm in vms:
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if vm not in vms_last_cpu:
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LOG.info(
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|
'No data yet for VM: %s - skipping host %s',
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|
vm, host)
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hosts_cpu_total.pop(host, None)
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hosts_ram_total.pop(host, None)
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|
hosts_cpu_usage.pop(host, None)
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|
hosts_ram_usage.pop(host, None)
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break
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host_cpu_mhz += vms_last_cpu[vm]
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else:
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|
hosts_cpu_usage[host] = host_cpu_mhz
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hosts_ram_usage[host] = host_used_ram(self.state['nova'],
|
|
host)
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else:
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|
inactive_hosts_cpu[host] = hosts_cpu_total[host]
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inactive_hosts_ram[host] = hosts_ram_total[host]
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hosts_cpu_total.pop(host, None)
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|
hosts_ram_total.pop(host, None)
|
|
|
|
# Exclude the overloaded host
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|
hosts_cpu_usage.pop(overloaded_host, None)
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hosts_cpu_total.pop(overloaded_host, None)
|
|
hosts_ram_usage.pop(overloaded_host, None)
|
|
hosts_ram_total.pop(overloaded_host, None)
|
|
|
|
LOG.debug('Host CPU usage: %s', str(hosts_last_cpu))
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|
LOG.debug('Host total CPU usage: %s', str(hosts_cpu_usage))
|
|
|
|
vms_to_migrate = vm_uuids
|
|
vms_cpu = {}
|
|
for vm in vms_to_migrate:
|
|
if vm not in vms_last_cpu:
|
|
LOG.info(
|
|
'No data yet for VM: %s - dropping the request',
|
|
vm)
|
|
LOG.info('Skipped an underload request')
|
|
return self.state
|
|
vms_cpu[vm] = self.state['db'].select_cpu_mhz_for_vm(
|
|
vm,
|
|
CONF.data_collector_data_length)
|
|
vms_ram = vms_ram_limit(self.state['nova'], vms_to_migrate)
|
|
|
|
# Remove VMs that are not in vms_ram
|
|
# These instances might have been deleted
|
|
for i, vm in enumerate(vms_to_migrate):
|
|
if vm not in vms_ram:
|
|
del vms_to_migrate[i]
|
|
|
|
if not vms_to_migrate:
|
|
LOG.info(
|
|
'No VMs to migrate - completed the overload request')
|
|
return self.state
|
|
|
|
for vm in vms_cpu.keys():
|
|
if vm not in vms_ram:
|
|
del vms_cpu[vm]
|
|
|
|
time_step = CONF.data_collector_interval
|
|
migration_time = common.calculate_migration_time(
|
|
vms_ram,
|
|
CONF.network_migration_bandwidth)
|
|
|
|
if 'vm_placement' not in self.state:
|
|
vm_placement_params = common.parse_parameters(
|
|
CONF.global_manager.algorithm_vm_placement_parameters)
|
|
vm_placement_state = None
|
|
vm_placement = common.call_function_by_name(
|
|
CONF.global_manager.algorithm_vm_placement_factory,
|
|
[time_step,
|
|
migration_time,
|
|
vm_placement_params])
|
|
self.state['vm_placement'] = vm_placement
|
|
self.state['vm_placement_state'] = {}
|
|
else:
|
|
vm_placement = self.state['vm_placement']
|
|
vm_placement_state = self.state['vm_placement_state']
|
|
|
|
LOG.info('Started overload VM placement')
|
|
placement, vm_placement_state = vm_placement(
|
|
hosts_cpu_usage, hosts_cpu_total,
|
|
hosts_ram_usage, hosts_ram_total,
|
|
inactive_hosts_cpu, inactive_hosts_ram,
|
|
vms_cpu, vms_ram,
|
|
vm_placement_state)
|
|
LOG.info('Completed overload VM placement')
|
|
self.state['vm_placement_state'] = vm_placement_state
|
|
|
|
LOG.info('Overload: obtained a new placement %s', str(placement))
|
|
|
|
if not placement:
|
|
LOG.info('Nothing to migrate')
|
|
else:
|
|
hosts_to_activate = list(
|
|
set(inactive_hosts_cpu.keys()).intersection(
|
|
set(placement.values())))
|
|
if hosts_to_activate:
|
|
self.switch_hosts_on(hosts_to_activate)
|
|
LOG.info('Started overload VM migrations')
|
|
migrate_vms(self.state['db'],
|
|
self.state['nova'],
|
|
CONF.global_manager.vm_instance_directory,
|
|
placement,
|
|
CONF.global_manager.block_migration)
|
|
LOG.info('Completed overload VM migrations')
|
|
LOG.info('Completed processing an overload request')
|
|
return self.state
|
|
|
|
def service(self, reason, host, vm_uuids):
|
|
try:
|
|
if reason == 0:
|
|
LOG.info('Processing an underload of a host %s', host)
|
|
self.execute_underload(host)
|
|
else:
|
|
LOG.info('Processing an overload, VMs: %s', str(vm_uuids))
|
|
self.execute_overload(host, vm_uuids)
|
|
except Exception:
|
|
LOG.exception('Exception during request processing:')
|
|
raise
|