125 lines
5.3 KiB
Python
125 lines
5.3 KiB
Python
# Copyright 2016 Cloudbase Solutions Srl
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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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"""Management class for cluster live migration VM operations."""
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from nova.compute import vm_states
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from nova import exception
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from os_win import constants as os_win_const
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from os_win import utilsfactory
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from oslo_log import log as logging
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from oslo_utils import excutils
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from compute_hyperv.i18n import _
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import compute_hyperv.nova.conf
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from compute_hyperv.nova import livemigrationops
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CONF = compute_hyperv.nova.conf.CONF
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LOG = logging.getLogger(__name__)
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class ClusterLiveMigrationOps(livemigrationops.LiveMigrationOps):
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def __init__(self):
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super(ClusterLiveMigrationOps, self).__init__()
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self._clustutils = utilsfactory.get_clusterutils()
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def is_instance_clustered(self, instance_name):
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return self._clustutils.vm_exists(instance_name)
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def live_migration(self, context, instance_ref, dest, post_method,
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recover_method, block_migration=False,
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migrate_data=None):
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LOG.debug("live_migration called.", instance=instance_ref)
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instance_name = instance_ref.name
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clustered = self.is_instance_clustered(instance_name)
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node_names = [node.upper() for node in
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self._clustutils.get_cluster_node_names()]
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if dest.upper() not in node_names or not clustered:
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# destination is not in same cluster or instance not clustered.
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# do a normal live migration.
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if clustered:
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# remove VM from cluster before proceding to a normal live
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# migration.
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self._clustutils.delete(instance_name)
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super(ClusterLiveMigrationOps, self).live_migration(
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context, instance_ref, dest, post_method, recover_method,
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block_migration, migrate_data)
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return
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elif self._clustutils.get_vm_host(
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instance_name).upper() == dest.upper():
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# VM is already migrated. Do nothing.
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# this can happen when the VM has been failovered.
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return
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# destination is in the same cluster.
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# perform a clustered live migration.
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try:
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self._clustutils.live_migrate_vm(
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instance_name,
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dest,
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CONF.hyperv.instance_live_migration_timeout)
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except Exception:
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with excutils.save_and_reraise_exception():
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self._check_failed_instance_migration(
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instance_ref,
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expected_state=os_win_const.CLUSTER_GROUP_ONLINE)
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LOG.debug("Calling live migration recover_method "
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"for instance.", instance=instance_ref)
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recover_method(context, instance_ref, dest, block_migration,
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migrate_data)
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LOG.debug("Calling live migration post_method for instance.",
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instance=instance_ref)
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post_method(context, instance_ref, dest,
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block_migration, migrate_data)
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def _check_failed_instance_migration(self, instance, expected_state):
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# After a failed migration, we expect the instance to be on the
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# source node, having its initial state and not have any queued
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# migrations. Otherwise, we treat it as a critical error and set
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# it to 'error' state to avoid inconsistencies.
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state_info = self._clustutils.get_cluster_group_state_info(
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instance.name)
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node_name = self._clustutils.get_node_name()
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if (state_info['owner_node'].lower() != node_name.lower()
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or state_info['state'] != expected_state
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or state_info['migration_queued']):
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instance.vm_state = vm_states.ERROR
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instance.save()
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raise exception.InstanceInvalidState(
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_("Instance %(instance_name)s reached an inconsistent state "
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"after a failed migration attempt. Setting the instance to "
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"'error' state. Instance state info: %(state_info)s.") %
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dict(instance_name=instance.name,
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state_info=state_info))
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def pre_live_migration(self, context, instance, block_device_info,
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network_info):
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if self.is_instance_clustered(instance.name):
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self._volumeops.connect_volumes(block_device_info)
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else:
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super(ClusterLiveMigrationOps, self).pre_live_migration(
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context, instance, block_device_info, network_info)
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def post_live_migration(self, context, instance, block_device_info,
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migrate_data):
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if not self.is_instance_clustered(instance.name):
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super(ClusterLiveMigrationOps, self).post_live_migration(
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context, instance, block_device_info, migrate_data)
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