608 lines
25 KiB
Python
608 lines
25 KiB
Python
# Copyright (c) 2012 NetApp, Inc.
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# Copyright (c) 2016 Red Hat, Inc.
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# All Rights Reserved.
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#
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# Licensed under the Apache License, Version 2.0 (the "License"); you may
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# not use this file except in compliance with the License. You may obtain
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# 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, WITHOUT
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# WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
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# License for the specific language governing permissions and limitations
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# under the License.
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import errno
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import os
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import time
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from os_brick.remotefs import remotefs as remotefs_brick
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from oslo_concurrency import processutils as putils
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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 oslo_utils import units
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import six
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from cinder import coordination
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from cinder import exception
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from cinder.i18n import _
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from cinder.image import image_utils
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from cinder import interface
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from cinder import utils
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from cinder.volume import configuration
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from cinder.volume.drivers import remotefs
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VERSION = '1.4.0'
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LOG = logging.getLogger(__name__)
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nfs_opts = [
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cfg.StrOpt('nfs_shares_config',
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default='/etc/cinder/nfs_shares',
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help='File with the list of available NFS shares.'),
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cfg.BoolOpt('nfs_sparsed_volumes',
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default=True,
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help='Create volumes as sparsed files which take no space. '
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'If set to False volume is created as regular file. '
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'In such case volume creation takes a lot of time.'),
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cfg.BoolOpt('nfs_qcow2_volumes',
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default=False,
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help='Create volumes as QCOW2 files rather than raw files.'),
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cfg.StrOpt('nfs_mount_point_base',
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default='$state_path/mnt',
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help='Base dir containing mount points for NFS shares.'),
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cfg.StrOpt('nfs_mount_options',
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help='Mount options passed to the NFS client. See section '
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'of the NFS man page for details.'),
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cfg.IntOpt('nfs_mount_attempts',
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default=3,
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help='The number of attempts to mount NFS shares before '
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'raising an error. At least one attempt will be '
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'made to mount an NFS share, regardless of the '
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'value specified.'),
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cfg.BoolOpt('nfs_snapshot_support',
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default=False,
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help='Enable support for snapshots on the NFS driver. '
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'Platforms using libvirt <1.2.7 will encounter issues '
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'with this feature.'),
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]
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CONF = cfg.CONF
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CONF.register_opts(nfs_opts, group=configuration.SHARED_CONF_GROUP)
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@interface.volumedriver
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class NfsDriver(remotefs.RemoteFSSnapDriverDistributed):
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"""NFS based cinder driver.
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Creates file on NFS share for using it as block device on hypervisor.
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"""
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driver_volume_type = 'nfs'
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driver_prefix = 'nfs'
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volume_backend_name = 'Generic_NFS'
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VERSION = VERSION
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# ThirdPartySystems wiki page
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CI_WIKI_NAME = "Cinder_Jenkins"
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def __init__(self, execute=putils.execute, *args, **kwargs):
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self._remotefsclient = None
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super(NfsDriver, self).__init__(*args, **kwargs)
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self.configuration.append_config_values(nfs_opts)
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root_helper = utils.get_root_helper()
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# base bound to instance is used in RemoteFsConnector.
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self.base = getattr(self.configuration,
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'nfs_mount_point_base')
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self.base = os.path.realpath(self.base)
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opts = getattr(self.configuration,
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'nfs_mount_options')
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nas_mount_options = getattr(self.configuration,
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'nas_mount_options',
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None)
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if nas_mount_options is not None:
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LOG.debug('overriding nfs_mount_options with nas_mount_options')
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opts = nas_mount_options
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self._remotefsclient = remotefs_brick.RemoteFsClient(
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'nfs', root_helper, execute=execute,
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nfs_mount_point_base=self.base,
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nfs_mount_options=opts)
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self._sparse_copy_volume_data = True
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self.reserved_percentage = self.configuration.reserved_percentage
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self.max_over_subscription_ratio = (
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self.configuration.max_over_subscription_ratio)
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def initialize_connection(self, volume, connector):
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LOG.debug('Initializing connection to volume %(vol)s. '
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'Connector: %(con)s', {'vol': volume.id, 'con': connector})
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active_vol = self.get_active_image_from_info(volume)
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volume_dir = self._local_volume_dir(volume)
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path_to_vol = os.path.join(volume_dir, active_vol)
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info = self._qemu_img_info(path_to_vol, volume['name'])
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data = {'export': volume.provider_location,
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'name': active_vol}
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if volume.provider_location in self.shares:
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data['options'] = self.shares[volume.provider_location]
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conn_info = {
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'driver_volume_type': self.driver_volume_type,
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'data': data,
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'mount_point_base': self._get_mount_point_base()
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}
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# Test file for raw vs. qcow2 format
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if info.file_format not in ['raw', 'qcow2']:
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msg = _('nfs volume must be a valid raw or qcow2 image.')
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raise exception.InvalidVolume(reason=msg)
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conn_info['data']['format'] = info.file_format
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LOG.debug('NfsDriver: conn_info: %s', conn_info)
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return conn_info
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def do_setup(self, context):
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"""Any initialization the volume driver does while starting."""
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super(NfsDriver, self).do_setup(context)
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nas_host = getattr(self.configuration,
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'nas_host',
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None)
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nas_share_path = getattr(self.configuration,
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'nas_share_path',
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None)
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# If both nas_host and nas_share_path are set we are not
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# going to use the nfs_shares_config file. So, only check
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# for its existence if it is going to be used.
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if((not nas_host) or (not nas_share_path)):
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config = self.configuration.nfs_shares_config
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if not config:
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msg = (_("There's no NFS config file configured (%s)") %
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'nfs_shares_config')
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LOG.warning(msg)
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raise exception.NfsException(msg)
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if not os.path.exists(config):
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msg = (_("NFS config file at %(config)s doesn't exist") %
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{'config': config})
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LOG.warning(msg)
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raise exception.NfsException(msg)
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self.shares = {} # address : options
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# Check if mount.nfs is installed on this system; note that we
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# need to be root, to also find mount.nfs on distributions, where
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# it is not located in an unprivileged users PATH (e.g. /sbin).
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package = 'mount.nfs'
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try:
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self._execute(package, check_exit_code=False,
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run_as_root=True)
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except OSError as exc:
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if exc.errno == errno.ENOENT:
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msg = _('%s is not installed') % package
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raise exception.NfsException(msg)
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else:
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raise
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# Now that all configuration data has been loaded (shares),
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# we can "set" our final NAS file security options.
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self.set_nas_security_options(self._is_voldb_empty_at_startup)
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self._check_snapshot_support(setup_checking=True)
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def _ensure_share_mounted(self, nfs_share):
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mnt_flags = []
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if self.shares.get(nfs_share) is not None:
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mnt_flags = self.shares[nfs_share].split()
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num_attempts = max(1, self.configuration.nfs_mount_attempts)
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for attempt in range(num_attempts):
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try:
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self._remotefsclient.mount(nfs_share, mnt_flags)
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return
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except Exception as e:
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if attempt == (num_attempts - 1):
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LOG.error('Mount failure for %(share)s after '
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'%(count)d attempts.',
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{'share': nfs_share,
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'count': num_attempts})
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raise exception.NfsException(six.text_type(e))
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LOG.debug('Mount attempt %(attempt)d failed: %(exc)s.\n'
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'Retrying mount ...',
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{'attempt': attempt, 'exc': e})
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time.sleep(1)
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def _find_share(self, volume):
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"""Choose NFS share among available ones for given volume size.
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For instances with more than one share that meets the criteria, the
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share with the least "allocated" space will be selected.
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:param volume: the volume to be created.
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"""
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if not self._mounted_shares:
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raise exception.NfsNoSharesMounted()
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target_share = None
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target_share_reserved = 0
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for nfs_share in self._mounted_shares:
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total_size, total_available, total_allocated = (
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self._get_capacity_info(nfs_share))
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share_info = {'total_size': total_size,
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'total_available': total_available,
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'total_allocated': total_allocated,
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}
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if not self._is_share_eligible(nfs_share,
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volume.size,
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share_info):
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continue
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if target_share is not None:
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if target_share_reserved > total_allocated:
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target_share = nfs_share
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target_share_reserved = total_allocated
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else:
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target_share = nfs_share
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target_share_reserved = total_allocated
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if target_share is None:
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raise exception.NfsNoSuitableShareFound(
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volume_size=volume.size)
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LOG.debug('Selected %s as target NFS share.', target_share)
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return target_share
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def _is_share_eligible(self, nfs_share, volume_size_in_gib,
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share_info=None):
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"""Verifies NFS share is eligible to host volume with given size.
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First validation step: ratio of actual space (used_space / total_space)
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is less than used_ratio. Second validation step: apparent space
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allocated (differs from actual space used when using sparse files)
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and compares the apparent available
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space (total_available * oversub_ratio) to ensure enough space is
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available for the new volume.
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:param nfs_share: NFS share
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:param volume_size_in_gib: int size in GB
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"""
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# Because the generic NFS driver aggregates over all shares
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# when reporting capacity and usage stats to the scheduler,
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# we still have to perform some scheduler-like capacity
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# checks here, and these have to take into account
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# configuration for reserved space and oversubscription.
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# It would be better to do all this in the scheduler, but
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# this requires either pool support for the generic NFS
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# driver or limiting each NFS backend driver to a single share.
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# derive used_ratio from reserved percentage
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if share_info is None:
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total_size, total_available, total_allocated = (
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self._get_capacity_info(nfs_share))
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share_info = {'total_size': total_size,
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'total_available': total_available,
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'total_allocated': total_allocated,
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}
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used_percentage = 100 - self.reserved_percentage
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used_ratio = used_percentage / 100.0
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requested_volume_size = volume_size_in_gib * units.Gi
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apparent_size = max(0, share_info['total_size'] *
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self.max_over_subscription_ratio)
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apparent_available = max(0, apparent_size -
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share_info['total_allocated'])
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actual_used_ratio = ((share_info['total_size'] -
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share_info['total_available']) /
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float(share_info['total_size']))
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if actual_used_ratio > used_ratio:
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# NOTE(morganfainberg): We check the used_ratio first since
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# with oversubscription it is possible to not have the actual
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# available space but be within our oversubscription limit
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# therefore allowing this share to still be selected as a valid
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# target.
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LOG.debug('%s is not eligible - used ratio exceeded.',
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nfs_share)
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return False
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if apparent_available <= requested_volume_size:
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LOG.debug('%s is not eligible - insufficient (apparent) available '
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'space.',
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nfs_share)
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return False
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if share_info['total_allocated'] / share_info['total_size'] >= (
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self.max_over_subscription_ratio):
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LOG.debug('%s is not eligible - utilization exceeds max '
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'over subscription ratio.',
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nfs_share)
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return False
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return True
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def _get_mount_point_for_share(self, nfs_share):
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"""Needed by parent class."""
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return self._remotefsclient.get_mount_point(nfs_share)
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def _get_capacity_info(self, nfs_share):
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"""Calculate available space on the NFS share.
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:param nfs_share: example 172.18.194.100:/var/nfs
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"""
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mount_point = self._get_mount_point_for_share(nfs_share)
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df, _ = self._execute('stat', '-f', '-c', '%S %b %a', mount_point,
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run_as_root=self._execute_as_root)
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block_size, blocks_total, blocks_avail = map(float, df.split())
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total_available = block_size * blocks_avail
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total_size = block_size * blocks_total
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du, _ = self._execute('du', '-sb', '--apparent-size', '--exclude',
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'*snapshot*', mount_point,
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run_as_root=self._execute_as_root)
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total_allocated = float(du.split()[0])
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return total_size, total_available, total_allocated
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def _get_mount_point_base(self):
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return self.base
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def extend_volume(self, volume, new_size):
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"""Extend an existing volume to the new size."""
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LOG.info('Extending volume %s.', volume.id)
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extend_by = int(new_size) - volume.size
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if not self._is_share_eligible(volume.provider_location,
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extend_by):
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raise exception.ExtendVolumeError(reason='Insufficient space to'
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' extend volume %s to %sG'
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% (volume.id, new_size))
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path = self.local_path(volume)
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LOG.info('Resizing file to %sG...', new_size)
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image_utils.resize_image(path, new_size,
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run_as_root=self._execute_as_root)
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if not self._is_file_size_equal(path, new_size):
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raise exception.ExtendVolumeError(
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reason='Resizing image file failed.')
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def _is_file_size_equal(self, path, size):
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"""Checks if file size at path is equal to size."""
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data = image_utils.qemu_img_info(path,
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run_as_root=self._execute_as_root)
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virt_size = int(data.virtual_size / units.Gi)
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return virt_size == size
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def set_nas_security_options(self, is_new_cinder_install):
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"""Determine the setting to use for Secure NAS options.
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Value of each NAS Security option is checked and updated. If the
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option is currently 'auto', then it is set to either true or false
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based upon if this is a new Cinder installation. The RemoteFS variable
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'_execute_as_root' will be updated for this driver.
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:param is_new_cinder_install: bool indication of new Cinder install
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"""
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doc_html = "http://docs.openstack.org/admin-guide" \
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"/blockstorage_nfs_backend.html"
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self._ensure_shares_mounted()
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if not self._mounted_shares:
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raise exception.NfsNoSharesMounted()
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nfs_mount = self._get_mount_point_for_share(self._mounted_shares[0])
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self.configuration.nas_secure_file_permissions = \
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self._determine_nas_security_option_setting(
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self.configuration.nas_secure_file_permissions,
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nfs_mount, is_new_cinder_install)
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LOG.debug('NAS variable secure_file_permissions setting is: %s',
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self.configuration.nas_secure_file_permissions)
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if self.configuration.nas_secure_file_permissions == 'false':
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LOG.warning("The NAS file permissions mode will be 666 "
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"(allowing other/world read & write access). "
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"This is considered an insecure NAS environment. "
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"Please see %s for information on a secure "
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"NFS configuration.",
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doc_html)
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self.configuration.nas_secure_file_operations = \
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self._determine_nas_security_option_setting(
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self.configuration.nas_secure_file_operations,
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nfs_mount, is_new_cinder_install)
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# If secure NAS, update the '_execute_as_root' flag to not
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# run as the root user; run as process' user ID.
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# TODO(eharney): need to separate secure NAS vs. execute as root.
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# There are requirements to run some commands as root even
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# when running in secure NAS mode. (i.e. read volume file
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# attached to an instance and owned by qemu:qemu)
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if self.configuration.nas_secure_file_operations == 'true':
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self._execute_as_root = False
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LOG.debug('NAS secure file operations setting is: %s',
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self.configuration.nas_secure_file_operations)
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if self.configuration.nas_secure_file_operations == 'false':
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LOG.warning("The NAS file operations will be run as "
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"root: allowing root level access at the storage "
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"backend. This is considered an insecure NAS "
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"environment. Please see %s "
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"for information on a secure NAS configuration.",
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doc_html)
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def update_migrated_volume(self, ctxt, volume, new_volume,
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original_volume_status):
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"""Return the keys and values updated from NFS for migrated volume.
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This method should rename the back-end volume name(id) on the
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destination host back to its original name(id) on the source host.
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:param ctxt: The context used to run the method update_migrated_volume
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:param volume: The original volume that was migrated to this backend
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:param new_volume: The migration volume object that was created on
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this backend as part of the migration process
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:param original_volume_status: The status of the original volume
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:returns: model_update to update DB with any needed changes
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"""
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name_id = None
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if original_volume_status == 'available':
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current_name = CONF.volume_name_template % new_volume.id
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original_volume_name = CONF.volume_name_template % volume.id
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current_path = self.local_path(new_volume)
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# Replace the volume name with the original volume name
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original_path = current_path.replace(current_name,
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original_volume_name)
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try:
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os.rename(current_path, original_path)
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except OSError:
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LOG.error('Unable to rename the logical volume '
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'for volume: %s', volume.id)
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# If the rename fails, _name_id should be set to the new
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# volume id and provider_location should be set to the
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# one from the new volume as well.
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name_id = new_volume._name_id or new_volume.id
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else:
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# The back-end will not be renamed.
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name_id = new_volume._name_id or new_volume.id
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return {'_name_id': name_id,
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'provider_location': new_volume.provider_location}
|
|
|
|
def _update_volume_stats(self):
|
|
"""Retrieve stats info from volume group."""
|
|
|
|
super(NfsDriver, self)._update_volume_stats()
|
|
self._stats['sparse_copy_volume'] = True
|
|
data = self._stats
|
|
|
|
global_capacity = data['total_capacity_gb']
|
|
global_free = data['free_capacity_gb']
|
|
|
|
thin_enabled = self.configuration.nfs_sparsed_volumes
|
|
if thin_enabled:
|
|
provisioned_capacity = self._get_provisioned_capacity()
|
|
else:
|
|
provisioned_capacity = round(global_capacity - global_free, 2)
|
|
|
|
data['provisioned_capacity_gb'] = provisioned_capacity
|
|
data['max_over_subscription_ratio'] = self.max_over_subscription_ratio
|
|
data['reserved_percentage'] = self.reserved_percentage
|
|
data['thin_provisioning_support'] = thin_enabled
|
|
data['thick_provisioning_support'] = not thin_enabled
|
|
|
|
self._stats = data
|
|
|
|
@coordination.synchronized('{self.driver_prefix}-{volume[id]}')
|
|
def create_volume(self, volume):
|
|
"""Apply locking to the create volume operation."""
|
|
|
|
return super(NfsDriver, self).create_volume(volume)
|
|
|
|
@coordination.synchronized('{self.driver_prefix}-{volume[id]}')
|
|
def delete_volume(self, volume):
|
|
"""Deletes a logical volume."""
|
|
|
|
LOG.debug('Deleting volume %(vol)s, provider_location: %(loc)s',
|
|
{'vol': volume.id, 'loc': volume.provider_location})
|
|
|
|
if not volume.provider_location:
|
|
LOG.warning('Volume %s does not have provider_location '
|
|
'specified, skipping', volume.name)
|
|
return
|
|
|
|
info_path = self._local_path_volume_info(volume)
|
|
info = self._read_info_file(info_path, empty_if_missing=True)
|
|
|
|
if info:
|
|
base_volume_path = os.path.join(self._local_volume_dir(volume),
|
|
info['active'])
|
|
self._delete(info_path)
|
|
else:
|
|
base_volume_path = self._local_path_volume(volume)
|
|
|
|
self._delete(base_volume_path)
|
|
|
|
def _qemu_img_info(self, path, volume_name):
|
|
return super(NfsDriver, self)._qemu_img_info_base(
|
|
path,
|
|
volume_name,
|
|
self.configuration.nfs_mount_point_base,
|
|
run_as_root=True)
|
|
|
|
def _check_snapshot_support(self, setup_checking=False):
|
|
"""Ensure snapshot support is enabled in config."""
|
|
|
|
if (not self.configuration.nfs_snapshot_support and
|
|
not setup_checking):
|
|
msg = _("NFS driver snapshot support is disabled in cinder.conf.")
|
|
raise exception.VolumeDriverException(message=msg)
|
|
|
|
if (self.configuration.nas_secure_file_operations == 'true' and
|
|
self.configuration.nfs_snapshot_support):
|
|
msg = _("Snapshots are not supported with "
|
|
"nas_secure_file_operations enabled ('true' or 'auto'). "
|
|
"Please set it to 'false' if you intend to have "
|
|
"it enabled.")
|
|
LOG.error(msg)
|
|
raise exception.VolumeDriverException(message=msg)
|
|
|
|
@coordination.synchronized('{self.driver_prefix}-{snapshot.volume.id}')
|
|
def create_snapshot(self, snapshot):
|
|
"""Apply locking to the create snapshot operation."""
|
|
|
|
self._check_snapshot_support()
|
|
return self._create_snapshot(snapshot)
|
|
|
|
@coordination.synchronized('{self.driver_prefix}-{snapshot.volume.id}')
|
|
def delete_snapshot(self, snapshot):
|
|
"""Apply locking to the delete snapshot operation."""
|
|
|
|
self._check_snapshot_support()
|
|
return self._delete_snapshot(snapshot)
|
|
|
|
def _copy_volume_from_snapshot(self, snapshot, volume, volume_size):
|
|
"""Copy data from snapshot to destination volume.
|
|
|
|
This is done with a qemu-img convert to raw/qcow2 from the snapshot
|
|
qcow2.
|
|
"""
|
|
|
|
LOG.debug("Copying snapshot: %(snap)s -> volume: %(vol)s, "
|
|
"volume_size: %(size)s GB",
|
|
{'snap': snapshot.id,
|
|
'vol': volume.id,
|
|
'size': volume_size})
|
|
|
|
info_path = self._local_path_volume_info(snapshot.volume)
|
|
snap_info = self._read_info_file(info_path)
|
|
vol_path = self._local_volume_dir(snapshot.volume)
|
|
forward_file = snap_info[snapshot.id]
|
|
forward_path = os.path.join(vol_path, forward_file)
|
|
|
|
# Find the file which backs this file, which represents the point
|
|
# when this snapshot was created.
|
|
img_info = self._qemu_img_info(forward_path, snapshot.volume.name)
|
|
path_to_snap_img = os.path.join(vol_path, img_info.backing_file)
|
|
|
|
path_to_new_vol = self._local_path_volume(volume)
|
|
|
|
LOG.debug("will copy from snapshot at %s", path_to_snap_img)
|
|
|
|
if self.configuration.nfs_qcow2_volumes:
|
|
out_format = 'qcow2'
|
|
else:
|
|
out_format = 'raw'
|
|
|
|
image_utils.convert_image(path_to_snap_img,
|
|
path_to_new_vol,
|
|
out_format,
|
|
run_as_root=self._execute_as_root)
|
|
|
|
self._set_rw_permissions_for_all(path_to_new_vol)
|