350 lines
15 KiB
Python
350 lines
15 KiB
Python
# Copyright 2013 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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"""
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Management class for migration / resize operations.
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"""
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import os
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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 oslo_utils import units
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from nova import exception
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from nova.i18n import _, _LW, _LE
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from nova import objects
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from nova.virt import configdrive
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from nova.virt.hyperv import block_device_manager
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from nova.virt.hyperv import constants
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from nova.virt.hyperv import imagecache
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from nova.virt.hyperv import pathutils
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from nova.virt.hyperv import vmops
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from nova.virt.hyperv import volumeops
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LOG = logging.getLogger(__name__)
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class MigrationOps(object):
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def __init__(self):
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self._hostutils = utilsfactory.get_hostutils()
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self._vmutils = utilsfactory.get_vmutils()
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self._vhdutils = utilsfactory.get_vhdutils()
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self._pathutils = pathutils.PathUtils()
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self._volumeops = volumeops.VolumeOps()
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self._vmops = vmops.VMOps()
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self._imagecache = imagecache.ImageCache()
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self._block_dev_man = block_device_manager.BlockDeviceInfoManager()
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def _migrate_disk_files(self, instance_name, disk_files, dest):
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# TODO(mikal): it would be nice if this method took a full instance,
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# because it could then be passed to the log messages below.
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same_host = False
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if dest in self._hostutils.get_local_ips():
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same_host = True
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LOG.debug("Migration target is the source host")
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else:
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LOG.debug("Migration target host: %s", dest)
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instance_path = self._pathutils.get_instance_dir(instance_name)
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revert_path = self._pathutils.get_instance_migr_revert_dir(
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instance_name, remove_dir=True, create_dir=True)
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dest_path = None
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try:
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if same_host:
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# Since source and target are the same, we copy the files to
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# a temporary location before moving them into place
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dest_path = '%s_tmp' % instance_path
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if self._pathutils.exists(dest_path):
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self._pathutils.rmtree(dest_path)
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self._pathutils.makedirs(dest_path)
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else:
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dest_path = self._pathutils.get_instance_dir(
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instance_name, dest, remove_dir=True)
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for disk_file in disk_files:
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# Skip the config drive as the instance is already configured
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if os.path.basename(disk_file).lower() != 'configdrive.vhd':
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LOG.debug('Copying disk "%(disk_file)s" to '
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'"%(dest_path)s"',
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{'disk_file': disk_file, 'dest_path': dest_path})
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self._pathutils.copy(disk_file, dest_path)
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self._pathutils.move_folder_files(instance_path, revert_path)
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if same_host:
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self._pathutils.move_folder_files(dest_path, instance_path)
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except Exception:
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with excutils.save_and_reraise_exception():
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self._cleanup_failed_disk_migration(instance_path, revert_path,
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dest_path)
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def _cleanup_failed_disk_migration(self, instance_path,
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revert_path, dest_path):
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try:
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if dest_path and self._pathutils.exists(dest_path):
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self._pathutils.rmtree(dest_path)
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if self._pathutils.exists(revert_path):
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self._pathutils.move_folder_files(revert_path, instance_path)
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self._pathutils.rmtree(revert_path)
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except Exception as ex:
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# Log and ignore this exception
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LOG.exception(ex)
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LOG.error(_LE("Cannot cleanup migration files"))
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def _check_target_flavor(self, instance, flavor):
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new_root_gb = flavor.root_gb
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curr_root_gb = instance.root_gb
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if new_root_gb < curr_root_gb:
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raise exception.InstanceFaultRollback(
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exception.CannotResizeDisk(
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reason=_("Cannot resize the root disk to a smaller size. "
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"Current size: %(curr_root_gb)s GB. Requested "
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"size: %(new_root_gb)s GB.") % {
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'curr_root_gb': curr_root_gb,
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'new_root_gb': new_root_gb}))
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def migrate_disk_and_power_off(self, context, instance, dest,
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flavor, network_info,
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block_device_info=None, timeout=0,
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retry_interval=0):
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LOG.debug("migrate_disk_and_power_off called", instance=instance)
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self._check_target_flavor(instance, flavor)
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self._vmops.power_off(instance, timeout, retry_interval)
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(disk_files,
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volume_drives) = self._vmutils.get_vm_storage_paths(instance.name)
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if disk_files:
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self._migrate_disk_files(instance.name, disk_files, dest)
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self._vmops.destroy(instance, destroy_disks=False)
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# disk_info is not used
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return ""
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def confirm_migration(self, migration, instance, network_info):
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LOG.debug("confirm_migration called", instance=instance)
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self._pathutils.get_instance_migr_revert_dir(instance.name,
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remove_dir=True)
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def _revert_migration_files(self, instance_name):
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instance_path = self._pathutils.get_instance_dir(
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instance_name, create_dir=False, remove_dir=True)
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revert_path = self._pathutils.get_instance_migr_revert_dir(
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instance_name)
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self._pathutils.rename(revert_path, instance_path)
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def _check_and_attach_config_drive(self, instance, vm_gen):
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if configdrive.required_by(instance):
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configdrive_path = self._pathutils.lookup_configdrive_path(
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instance.name)
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if configdrive_path:
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self._vmops.attach_config_drive(instance, configdrive_path,
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vm_gen)
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else:
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raise exception.ConfigDriveNotFound(
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instance_uuid=instance.uuid)
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def finish_revert_migration(self, context, instance, network_info,
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block_device_info=None, power_on=True):
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LOG.debug("finish_revert_migration called", instance=instance)
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instance_name = instance.name
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self._revert_migration_files(instance_name)
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image_meta = objects.ImageMeta.from_instance(instance)
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vm_gen = self._vmops.get_image_vm_generation(instance.uuid, image_meta)
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self._block_dev_man.validate_and_update_bdi(instance, image_meta,
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vm_gen, block_device_info)
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root_device = block_device_info['root_disk']
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if root_device['type'] == constants.DISK:
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root_vhd_path = self._pathutils.lookup_root_vhd_path(instance_name)
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root_device['path'] = root_vhd_path
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if not root_vhd_path:
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base_vhd_path = self._pathutils.get_instance_dir(instance_name)
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raise exception.DiskNotFound(location=base_vhd_path)
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ephemerals = block_device_info['ephemerals']
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self._check_ephemeral_disks(instance, ephemerals)
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self._vmops.create_instance(instance, network_info, root_device,
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block_device_info, vm_gen)
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self._check_and_attach_config_drive(instance, vm_gen)
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if power_on:
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self._vmops.power_on(instance)
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def _merge_base_vhd(self, diff_vhd_path, base_vhd_path):
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base_vhd_copy_path = os.path.join(os.path.dirname(diff_vhd_path),
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os.path.basename(base_vhd_path))
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try:
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LOG.debug('Copying base disk %(base_vhd_path)s to '
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'%(base_vhd_copy_path)s',
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{'base_vhd_path': base_vhd_path,
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'base_vhd_copy_path': base_vhd_copy_path})
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self._pathutils.copyfile(base_vhd_path, base_vhd_copy_path)
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LOG.debug("Reconnecting copied base VHD "
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"%(base_vhd_copy_path)s and diff "
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"VHD %(diff_vhd_path)s",
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{'base_vhd_copy_path': base_vhd_copy_path,
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'diff_vhd_path': diff_vhd_path})
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self._vhdutils.reconnect_parent_vhd(diff_vhd_path,
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base_vhd_copy_path)
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LOG.debug("Merging differential disk %s into its parent.",
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diff_vhd_path)
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self._vhdutils.merge_vhd(diff_vhd_path)
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# Replace the differential VHD with the merged one
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self._pathutils.rename(base_vhd_copy_path, diff_vhd_path)
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except Exception:
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with excutils.save_and_reraise_exception():
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if self._pathutils.exists(base_vhd_copy_path):
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self._pathutils.remove(base_vhd_copy_path)
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def _check_resize_vhd(self, vhd_path, vhd_info, new_size):
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curr_size = vhd_info['VirtualSize']
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if new_size < curr_size:
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raise exception.CannotResizeDisk(
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reason=_("Cannot resize the root disk to a smaller size. "
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"Current size: %(curr_root_gb)s GB. Requested "
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"size: %(new_root_gb)s GB.") % {
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'curr_root_gb': curr_size / units.Gi,
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'new_root_gb': new_size / units.Gi})
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elif new_size > curr_size:
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self._resize_vhd(vhd_path, new_size)
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def _resize_vhd(self, vhd_path, new_size):
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if vhd_path.split('.')[-1].lower() == "vhd":
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LOG.debug("Getting parent disk info for disk: %s", vhd_path)
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base_disk_path = self._vhdutils.get_vhd_parent_path(vhd_path)
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if base_disk_path:
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# A differential VHD cannot be resized. This limitation
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# does not apply to the VHDX format.
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self._merge_base_vhd(vhd_path, base_disk_path)
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LOG.debug("Resizing disk \"%(vhd_path)s\" to new max "
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"size %(new_size)s",
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{'vhd_path': vhd_path, 'new_size': new_size})
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self._vhdutils.resize_vhd(vhd_path, new_size)
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def _check_base_disk(self, context, instance, diff_vhd_path,
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src_base_disk_path):
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base_vhd_path = self._imagecache.get_cached_image(context, instance)
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# If the location of the base host differs between source
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# and target hosts we need to reconnect the base disk
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if src_base_disk_path.lower() != base_vhd_path.lower():
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LOG.debug("Reconnecting copied base VHD "
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"%(base_vhd_path)s and diff "
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"VHD %(diff_vhd_path)s",
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{'base_vhd_path': base_vhd_path,
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'diff_vhd_path': diff_vhd_path})
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self._vhdutils.reconnect_parent_vhd(diff_vhd_path,
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base_vhd_path)
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def finish_migration(self, context, migration, instance, disk_info,
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network_info, image_meta, resize_instance=False,
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block_device_info=None, power_on=True):
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LOG.debug("finish_migration called", instance=instance)
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instance_name = instance.name
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vm_gen = self._vmops.get_image_vm_generation(instance.uuid, image_meta)
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self._block_dev_man.validate_and_update_bdi(instance, image_meta,
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vm_gen, block_device_info)
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root_device = block_device_info['root_disk']
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if root_device['type'] == constants.DISK:
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root_vhd_path = self._pathutils.lookup_root_vhd_path(instance_name)
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root_device['path'] = root_vhd_path
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if not root_vhd_path:
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base_vhd_path = self._pathutils.get_instance_dir(instance_name)
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raise exception.DiskNotFound(location=base_vhd_path)
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root_vhd_info = self._vhdutils.get_vhd_info(root_vhd_path)
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src_base_disk_path = root_vhd_info.get("ParentPath")
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if src_base_disk_path:
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self._check_base_disk(context, instance, root_vhd_path,
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src_base_disk_path)
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if resize_instance:
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new_size = instance.root_gb * units.Gi
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self._check_resize_vhd(root_vhd_path, root_vhd_info, new_size)
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ephemerals = block_device_info['ephemerals']
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self._check_ephemeral_disks(instance, ephemerals, resize_instance)
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self._vmops.create_instance(instance, network_info, root_device,
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block_device_info, vm_gen)
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self._check_and_attach_config_drive(instance, vm_gen)
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if power_on:
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self._vmops.power_on(instance)
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def _check_ephemeral_disks(self, instance, ephemerals,
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resize_instance=False):
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instance_name = instance.name
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new_eph_gb = instance.get('ephemeral_gb', 0)
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if len(ephemerals) == 1:
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# NOTE(claudiub): Resize only if there is one ephemeral. If there
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# are more than 1, resizing them can be problematic. This behaviour
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# also exists in the libvirt driver and it has to be addressed in
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# the future.
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ephemerals[0]['size'] = new_eph_gb
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elif sum(eph['size'] for eph in ephemerals) != new_eph_gb:
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# New ephemeral size is different from the original ephemeral size
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# and there are multiple ephemerals.
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LOG.warning(_LW("Cannot resize multiple ephemeral disks for "
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"instance."), instance=instance)
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for index, eph in enumerate(ephemerals):
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eph_name = "eph%s" % index
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existing_eph_path = self._pathutils.lookup_ephemeral_vhd_path(
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instance_name, eph_name)
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if not existing_eph_path:
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eph['format'] = self._vhdutils.get_best_supported_vhd_format()
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eph['path'] = self._pathutils.get_ephemeral_vhd_path(
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instance_name, eph['format'], eph_name)
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if not resize_instance:
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# ephemerals should have existed.
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raise exception.DiskNotFound(location=eph['path'])
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if eph['size']:
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# create ephemerals
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self._vmops.create_ephemeral_disk(instance.name, eph)
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elif eph['size'] > 0:
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# ephemerals exist. resize them.
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eph['path'] = existing_eph_path
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eph_vhd_info = self._vhdutils.get_vhd_info(eph['path'])
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self._check_resize_vhd(
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eph['path'], eph_vhd_info, eph['size'] * units.Gi)
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else:
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# ephemeral new size is 0, remove it.
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self._pathutils.remove(existing_eph_path)
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eph['path'] = None
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