刪除 OpenStack Nova Volume 時遇到的 error_deleting 問題

前段時間 VPSee 在 OpenStack Nova 上刪除一個 volume 的時候（vol-00000002）報錯，檢查了一下 volume 的狀態是 error_deleting 然後就無法刪除了，不管用 euca-delete-volume 還是 nova-manage volume delete 都無法刪除。


# euca-delete-volume vol-00000002
ApiError: ApiError: Volume status must be available

# euca-describe-volumes 
VOLUME	vol-00000002  10  nova	error_deleting (mycloud, node01, None, None)	2011-08-30T13:15:24Z
VOLUME	vol-00000003  10  nova	available (mycloud, node01, None, None)	2011-08-30T13:20:04Z

查了一下要刪除的 volume-00000002 的情況：


# lvdisplay
...
--- Logical volume ---
  LV Name                /dev/nova-volumes/volume-00000002
  VG Name                nova-volumes
  LV UUID                UgOwdr-W61E-MrdG-PrdY-IToa-LBi8-2XJjXF
  LV Write Access        read/write
  LV Status              available
  # open                 0
  LV Size                10.00 GiB
  Current LE             2560
  Segments               1
  Allocation             inherit
  Read ahead sectors     auto
  - currently set to     256
  Block device           251:2
...

既然用工具沒法刪除的話就乾脆從數據庫裏直接刪除，無非就是一條記錄而已，先從 nova 數據庫裏找到這條 volume 記錄並設置狀態爲 deleted，然後刪除實際對應的 LVM. 從數據庫裏找到相應的表和記錄後設置 status 爲 deleted 狀態：


# mysql -u root -p
Enter password:

mysql> use nova;

mysql> select status,id from volumes;
+----------------+----+
| status         | id |
+----------------+----+
| creating       |  1 |
| error_deleting |  2 |
| available      |  3 |
+----------------+----+describe
3 rows in set (0.00 sec)

mysql> update volumes set status='deleted' where id='2';
Query OK, 1 row affected (0.00 sec)
Rows matched: 1  Changed: 1  Warnings: 0

退出 mysql 數據庫操作回到命令行就會看到 vol-00000002 的狀態是 deleted 的，然後用 lvmremove 命令刪除：


# euca-describe-volumes 
VOLUME	vol-00000002  10  nova	deleted (mycloud, node01, None, None)	2011-08-30T13:15:24Z

# ls /dev/nova-volumes/
volume-00000002 volume-00000003

# lvremove /dev/nova-volumes/volume-00000002 
Do you really want to remove active logical volume volume-00000002? [y/n]: y
  Logical volume "volume-00000002" successfully removed

最後用 nova-manage 命令從數據庫裏徹底刪除 vol-00000002（當然也可以直接在 mysql 裏用 SQL 語句操作刪除對應的記錄 DELETE FROM volumes WHERE id=’2′;）：


 euca-delete-volume vol-00000002
ApiError: ApiError: Volume status must be available

# euca-describe-volumes 
VOLUME	vol-00000002  10  nova	error_deleting (mycloud, node01, None, None)	2011-08-30T13:15:24Z
VOLUME	vol-00000003  10  nova	avaiable (mycloud, node01, None, None)	2011-08-30T13:20:04Z

# nova-manage volume delete vol-00000002

# euca-describe-volumes 
VOLUME	vol-00000003  10  nova	available (mycloud, node01, None, None)	2011-08-30T13:20:04Z

另外可能會出現這個問題：

MYSQL: Cannot delete or update a parent row: a foreign key constraint fails

在SQLyog中刪除一張表時候，出現
Error No. 1451 Cannot delete or update a parent row: a foreign key constraint fails (...)
這可能是MySQL在InnoDB中設置了foreign key關聯，造成無法更新或刪除數據。可以通過設置FOREIGN_KEY_CHECKS變量來避免這種情況。 SET FOREIGN_KEY_CHECKS = 0;刪除完成後設置 SET FOREIGN_KEY_CHECKS = 1;

轉自：http://www.vpsee.com/2011/09/how-to-delete-a-openstack-nova-volume-when-the-status-is-error_deleting/

刪除 OpenStack Nova Volume 時遇到的 error_deleting 問題