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# Copyright 2012 Cloudbase Solutions Srl
# All Rights Reserved.
#
# 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.
"""
Management class for live migration VM operations.
"""
import functools
from oslo.config import cfg
from nova.openstack.common import excutils
from nova.openstack.common.gettextutils import _
from nova.openstack.common import log as logging
from nova.virt.hyperv import imagecache
from nova.virt.hyperv import utilsfactory
from nova.virt.hyperv import volumeops
LOG = logging.getLogger(__name__)
CONF = cfg.CONF
CONF.import_opt('use_cow_images', 'nova.virt.driver')
def check_os_version_requirement(function):
@functools.wraps(function)
def wrapper(self, *args, **kwds):
if not self._livemigrutils:
raise NotImplementedError(_('Live migration is supported '
'starting with Hyper-V Server '
'2012'))
return function(self, *args, **kwds)
return wrapper
class LiveMigrationOps(object):
def __init__(self):
# Live migration is supported starting from Hyper-V Server 2012
if utilsfactory.get_hostutils().check_min_windows_version(6, 2):
self._livemigrutils = utilsfactory.get_livemigrationutils()
else:
self._livemigrutils = None
self._pathutils = utilsfactory.get_pathutils()
self._volumeops = volumeops.VolumeOps()
self._imagecache = imagecache.ImageCache()
@check_os_version_requirement
def live_migration(self, context, instance_ref, dest, post_method,
recover_method, block_migration=False,
migrate_data=None):
LOG.debug("live_migration called", instance=instance_ref)
instance_name = instance_ref["name"]
try:
iscsi_targets = self._livemigrutils.live_migrate_vm(instance_name,
dest)
for (target_iqn, target_lun) in iscsi_targets:
self._volumeops.logout_storage_target(target_iqn)
except Exception:
with excutils.save_and_reraise_exception():
LOG.debug("Calling live migration recover_method "
"for instance: %s", instance_name)
recover_method(context, instance_ref, dest, block_migration)
LOG.debug("Calling live migration post_method for instance: %s",
instance_name)
post_method(context, instance_ref, dest, block_migration)
@check_os_version_requirement
def pre_live_migration(self, context, instance, block_device_info,
network_info):
LOG.debug("pre_live_migration called", instance=instance)
self._livemigrutils.check_live_migration_config()
if CONF.use_cow_images:
boot_from_volume = self._volumeops.ebs_root_in_block_devices(
block_device_info)
if not boot_from_volume:
self._imagecache.get_cached_image(context, instance)
self._volumeops.login_storage_targets(block_device_info)
@check_os_version_requirement
def post_live_migration_at_destination(self, ctxt, instance_ref,
network_info, block_migration):
LOG.debug("post_live_migration_at_destination called",
instance=instance_ref)
@check_os_version_requirement
def check_can_live_migrate_destination(self, ctxt, instance_ref,
src_compute_info, dst_compute_info,
block_migration=False,
disk_over_commit=False):
LOG.debug("check_can_live_migrate_destination called", instance_ref)
return {}
@check_os_version_requirement
def check_can_live_migrate_destination_cleanup(self, ctxt,
dest_check_data):
LOG.debug("check_can_live_migrate_destination_cleanup called")
@check_os_version_requirement
def check_can_live_migrate_source(self, ctxt, instance_ref,
dest_check_data):
LOG.debug("check_can_live_migrate_source called", instance_ref)
return dest_check_data
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