1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
262
263
264
265
266
267
268
269
270
271
272
|
# vim: tabstop=4 shiftwidth=4 softtabstop=4
# Copyright 2013 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 migration / resize operations.
"""
import os
from nova.openstack.common import excutils
from nova.openstack.common.gettextutils import _
from nova.openstack.common import log as logging
from nova.openstack.common import units
from nova.virt.hyperv import imagecache
from nova.virt.hyperv import utilsfactory
from nova.virt.hyperv import vmops
from nova.virt.hyperv import vmutils
from nova.virt.hyperv import volumeops
LOG = logging.getLogger(__name__)
class MigrationOps(object):
def __init__(self):
self._hostutils = utilsfactory.get_hostutils()
self._vmutils = utilsfactory.get_vmutils()
self._vhdutils = utilsfactory.get_vhdutils()
self._pathutils = utilsfactory.get_pathutils()
self._volumeops = volumeops.VolumeOps()
self._vmops = vmops.VMOps()
self._imagecache = imagecache.ImageCache()
def _migrate_disk_files(self, instance_name, disk_files, dest):
same_host = False
if dest in self._hostutils.get_local_ips():
same_host = True
LOG.debug(_("Migration target is the source host"))
else:
LOG.debug(_("Migration target host: %s") % dest)
instance_path = self._pathutils.get_instance_dir(instance_name)
revert_path = self._pathutils.get_instance_migr_revert_dir(
instance_name, remove_dir=True)
dest_path = None
try:
if same_host:
# Since source and target are the same, we copy the files to
# a temporary location before moving them into place
dest_path = '%s_tmp' % instance_path
if self._pathutils.exists(dest_path):
self._pathutils.rmtree(dest_path)
self._pathutils.makedirs(dest_path)
else:
dest_path = self._pathutils.get_instance_dir(
instance_name, dest, remove_dir=True)
for disk_file in disk_files:
# Skip the config drive as the instance is already configured
if os.path.basename(disk_file).lower() != 'configdrive.vhd':
LOG.debug(_('Copying disk "%(disk_file)s" to '
'"%(dest_path)s"'),
{'disk_file': disk_file, 'dest_path': dest_path})
self._pathutils.copy(disk_file, dest_path)
self._pathutils.rename(instance_path, revert_path)
if same_host:
self._pathutils.rename(dest_path, instance_path)
except Exception:
with excutils.save_and_reraise_exception():
self._cleanup_failed_disk_migration(instance_path, revert_path,
dest_path)
def _cleanup_failed_disk_migration(self, instance_path,
revert_path, dest_path):
try:
if dest_path and self._pathutils.exists(dest_path):
self._pathutils.rmtree(dest_path)
if self._pathutils.exists(revert_path):
self._pathutils.rename(revert_path, instance_path)
except Exception as ex:
# Log and ignore this exception
LOG.exception(ex)
LOG.error(_("Cannot cleanup migration files"))
def _check_target_flavor(self, instance, flavor):
new_root_gb = flavor['root_gb']
curr_root_gb = instance['root_gb']
if new_root_gb < curr_root_gb:
raise vmutils.VHDResizeException(
_("Cannot resize the root disk to a smaller size. Current "
"size: %(curr_root_gb)s GB. Requested size: "
"%(new_root_gb)s GB") %
{'curr_root_gb': curr_root_gb, 'new_root_gb': new_root_gb})
def migrate_disk_and_power_off(self, context, instance, dest,
flavor, network_info,
block_device_info=None):
LOG.debug(_("migrate_disk_and_power_off called"), instance=instance)
self._check_target_flavor(instance, flavor)
self._vmops.power_off(instance)
instance_name = instance["name"]
(disk_files,
volume_drives) = self._vmutils.get_vm_storage_paths(instance_name)
if disk_files:
self._migrate_disk_files(instance_name, disk_files, dest)
self._vmops.destroy(instance, destroy_disks=False)
# disk_info is not used
return ""
def confirm_migration(self, migration, instance, network_info):
LOG.debug(_("confirm_migration called"), instance=instance)
self._pathutils.get_instance_migr_revert_dir(instance['name'],
remove_dir=True)
def _revert_migration_files(self, instance_name):
instance_path = self._pathutils.get_instance_dir(
instance_name, create_dir=False, remove_dir=True)
revert_path = self._pathutils.get_instance_migr_revert_dir(
instance_name)
self._pathutils.rename(revert_path, instance_path)
def finish_revert_migration(self, context, instance, network_info,
block_device_info=None, power_on=True):
LOG.debug(_("finish_revert_migration called"), instance=instance)
instance_name = instance['name']
self._revert_migration_files(instance_name)
if self._volumeops.ebs_root_in_block_devices(block_device_info):
root_vhd_path = None
else:
root_vhd_path = self._pathutils.lookup_root_vhd_path(instance_name)
eph_vhd_path = self._pathutils.lookup_ephemeral_vhd_path(instance_name)
self._vmops.create_instance(instance, network_info, block_device_info,
root_vhd_path, eph_vhd_path)
if power_on:
self._vmops.power_on(instance)
def _merge_base_vhd(self, diff_vhd_path, base_vhd_path):
base_vhd_copy_path = os.path.join(os.path.dirname(diff_vhd_path),
os.path.basename(base_vhd_path))
try:
LOG.debug(_('Copying base disk %(base_vhd_path)s to '
'%(base_vhd_copy_path)s'),
{'base_vhd_path': base_vhd_path,
'base_vhd_copy_path': base_vhd_copy_path})
self._pathutils.copyfile(base_vhd_path, base_vhd_copy_path)
LOG.debug(_("Reconnecting copied base VHD "
"%(base_vhd_copy_path)s and diff "
"VHD %(diff_vhd_path)s"),
{'base_vhd_copy_path': base_vhd_copy_path,
'diff_vhd_path': diff_vhd_path})
self._vhdutils.reconnect_parent_vhd(diff_vhd_path,
base_vhd_copy_path)
LOG.debug(_("Merging base disk %(base_vhd_copy_path)s and "
"diff disk %(diff_vhd_path)s"),
{'base_vhd_copy_path': base_vhd_copy_path,
'diff_vhd_path': diff_vhd_path})
self._vhdutils.merge_vhd(diff_vhd_path, base_vhd_copy_path)
# Replace the differential VHD with the merged one
self._pathutils.rename(base_vhd_copy_path, diff_vhd_path)
except Exception:
with excutils.save_and_reraise_exception():
if self._pathutils.exists(base_vhd_copy_path):
self._pathutils.remove(base_vhd_copy_path)
def _check_resize_vhd(self, vhd_path, vhd_info, new_size):
curr_size = vhd_info['MaxInternalSize']
if new_size < curr_size:
raise vmutils.VHDResizeException(_("Cannot resize a VHD "
"to a smaller size"))
elif new_size > curr_size:
self._resize_vhd(vhd_path, new_size)
def _resize_vhd(self, vhd_path, new_size):
if vhd_path.split('.')[-1].lower() == "vhd":
LOG.debug(_("Getting parent disk info for disk: %s"), vhd_path)
base_disk_path = self._vhdutils.get_vhd_parent_path(vhd_path)
if base_disk_path:
# A differential VHD cannot be resized. This limitation
# does not apply to the VHDX format.
self._merge_base_vhd(vhd_path, base_disk_path)
LOG.debug(_("Resizing disk \"%(vhd_path)s\" to new max "
"size %(new_size)s"),
{'vhd_path': vhd_path, 'new_size': new_size})
self._vhdutils.resize_vhd(vhd_path, new_size)
def _check_base_disk(self, context, instance, diff_vhd_path,
src_base_disk_path):
base_vhd_path = self._imagecache.get_cached_image(context, instance)
# If the location of the base host differs between source
# and target hosts we need to reconnect the base disk
if src_base_disk_path.lower() != base_vhd_path.lower():
LOG.debug(_("Reconnecting copied base VHD "
"%(base_vhd_path)s and diff "
"VHD %(diff_vhd_path)s"),
{'base_vhd_path': base_vhd_path,
'diff_vhd_path': diff_vhd_path})
self._vhdutils.reconnect_parent_vhd(diff_vhd_path,
base_vhd_path)
def finish_migration(self, context, migration, instance, disk_info,
network_info, image_meta, resize_instance=False,
block_device_info=None, power_on=True):
LOG.debug(_("finish_migration called"), instance=instance)
instance_name = instance['name']
if self._volumeops.ebs_root_in_block_devices(block_device_info):
root_vhd_path = None
else:
root_vhd_path = self._pathutils.lookup_root_vhd_path(instance_name)
if not root_vhd_path:
raise vmutils.HyperVException(_("Cannot find boot VHD "
"file for instance: %s") %
instance_name)
root_vhd_info = self._vhdutils.get_vhd_info(root_vhd_path)
src_base_disk_path = root_vhd_info.get("ParentPath")
if src_base_disk_path:
self._check_base_disk(context, instance, root_vhd_path,
src_base_disk_path)
if resize_instance:
new_size = instance['root_gb'] * units.Gi
self._check_resize_vhd(root_vhd_path, root_vhd_info, new_size)
eph_vhd_path = self._pathutils.lookup_ephemeral_vhd_path(instance_name)
if resize_instance:
new_size = instance.get('ephemeral_gb', 0) * units.Gi
if not eph_vhd_path:
if new_size:
eph_vhd_path = self._vmops.create_ephemeral_vhd(instance)
else:
eph_vhd_info = self._vhdutils.get_vhd_info(eph_vhd_path)
self._check_resize_vhd(eph_vhd_path, eph_vhd_info, new_size)
self._vmops.create_instance(instance, network_info, block_device_info,
root_vhd_path, eph_vhd_path)
if power_on:
self._vmops.power_on(instance)
|
