[openstack-ko] live migration 관련 질문
김정석(Cloud운영기술팀)
ironman.kim at kt.com
Fri Mar 6 07:08:03 UTC 2015
페이스북에 질문 하면 답변 안해준다고 하니 메일링으로 쏩니다 ^^
NFS 볼륨으로 구축한 Openstack Juno 버전에서 Live Migration 을 실행해보니 Shared 볼륨이 아니라서 마이그레이션을 할 수 없다는
에러가 발생 하여 관련 소스를 좀 열어 봤습니다.
혹시나 해서 Grizzly, Icehouse, Juno 를 모두 비교 해보고 있는데 Juno 는 소스가 많이 바뀌었네요
/usr/lib/python2.7/dist-packages/nova/virt/libvirt/driver.py"
# Grizzly
2885 # Checking shared storage connectivity
2886 # if block migration, instances_paths should not be on shared storage.
2887 source = CONF.host
2888 filename = dest_check_data["filename"]
2889 block_migration = dest_check_data["block_migration"]
2890 is_volume_backed = dest_check_data.get('is_volume_backed', False)
2891
2892 shared = self._check_shared_storage_test_file(filename)
2893
2894 if block_migration:
2895 if shared:
2896 reason = _("Block migration can not be used "
2897 "with shared storage.")
2898 raise exception.InvalidLocalStorage(reason=reason, path=source)
2899 self._assert_dest_node_has_enough_disk(ctxt, instance_ref,
2900 dest_check_data['disk_available_mb'],
2901 dest_check_data['disk_over_commit'])
2902
2903 elif not shared and not is_volume_backed:
2904 reason = _("Live migration can not be used "
2905 "without shared storage.")
2906 raise exception.InvalidSharedStorage(reason=reason, path=source)
2907 dest_check_data.update({"is_shared_storage": shared})
2908 return dest_check_data
2909
# Icehouse
4279 # Checking shared storage connectivity
4280 # if block migration, instances_paths should not be on shared storage.
4281 source = CONF.host
4282 filename = dest_check_data["filename"]
4283 block_migration = dest_check_data["block_migration"]
4284 is_volume_backed = dest_check_data.get('is_volume_backed', False)
4285 has_local_disks = bool(
4286 jsonutils.loads(self.get_instance_disk_info(instance['name'])))
4287
4288 shared = self._check_shared_storage_test_file(filename)
4289
4290 if block_migration:
4291 if shared:
4292 reason = _("Block migration can not be used "
4293 "with shared storage.")
4294 raise exception.InvalidLocalStorage(reason=reason, path=source)
4295 self._assert_dest_node_has_enough_disk(context, instance,
4296 dest_check_data['disk_available_mb'],
4297 dest_check_data['disk_over_commit'])
4298
4299 elif not shared and (not is_volume_backed or has_local_disks):
4300 reason = _("Live migration can not be used "
4301 "without shared storage.")
4302 raise exception.InvalidSharedStorage(reason=reason, path=source)
4303 dest_check_data.update({"is_shared_storage": shared})
# Juno
5031 # Checking shared storage connectivity
5032 # if block migration, instances_paths should not be on shared storage.
5033 source = CONF.host
5034
5035 dest_check_data.update({'is_shared_instance_path':
5036 self._check_shared_storage_test_file(
5037 dest_check_data['filename'])})
5038
5039 dest_check_data.update({'is_shared_block_storage':
5040 self._is_shared_block_storage(instance, dest_check_data)})
5041
5042 if dest_check_data['block_migration']:
5043 if (dest_check_data['is_shared_block_storage'] or
5044 dest_check_data['is_shared_instance_path']):
5045 reason = _("Block migration can not be used "
5046 "with shared storage.")
5047 raise exception.InvalidLocalStorage(reason=reason, path=source)
5048 self._assert_dest_node_has_enough_disk(context, instance,
5049 dest_check_data['disk_available_mb'],
5050 dest_check_data['disk_over_commit'])
5051
5052 elif not (dest_check_data['is_shared_block_storage'] or
5053 dest_check_data['is_shared_instance_path']):
5054 reason = _("Live migration can not be used "
5055 "without shared storage.")
5056 raise exception.InvalidSharedStorage(reason=reason, path=source)
현재 Juno 버전에서 Exception 이 발생하는곳이 마지막 줄에서 걸린 것으로 확인 됩니다.
혹시 dest_check_data['is_shared_block_storage'] 의 값을 어디서 가져와서 if 구문을 처리하는지 아시는분 계시나요 ?
[1등]
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김정석
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010-2864-2631 / ironman.kim at kt.com<mailto:ironman.kim at kt.com>
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