[openstack-ko] live migration 관련 질문

안승규 dappy at naver.com
Sun Mar 8 13:47:22 UTC 2015


 
안녕하세요.
 
5040 라인에 답이 있네요..
self._is_shared_block_storage(instance, dest_check_data)})
 
위 메소드를 들어가보면 백엔드를 쓰는데 conf 의 [ libvirt ] 에서  images_type 이 rbd 가 아니면 is_shared_block_storage 값이 모두 false 네요.
Qcow2, Lvm, Ploop 타입은 false,  Rbd 만 True


결국 Ceph 의 rbd 타입이 아니면 is_shared_block_storage 값은 false 입니다.
block migration 옵션 안주고 하실려면 소스 수정하세요..
 
 
-----Original Message-----
From: "김정석(Cloud운영기술팀)"<ironman.kim at kt.com> 
To: "openstack-ko at lists.openstack.org"<openstack-ko at lists.openstack.org>; 
Cc: "송덕한(Cloud운영기술팀)"<ascacults at kt.com>; "안선희(차세대Cloud개발팀)"<sunhee.ahn at kt.com>; "최성삼(Cloud운영기술팀)"<choi.sungsam at kt.com>; 
Sent: 2015-03-06 (금) 16:08:03
Subject: [openstack-ko] live migration 관련 질문
 







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 ?

 

 

 
















김정석









과장Cloud운영기술팀



Cloud담당 기술서비스본부











 



010-2864-2631 / 
ironman.kim at kt.com



 



 







 

 


 



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