1、在web界面找到要恢复的虚拟机
2、查看虚拟机的云硬盘ID
3、列如：云硬盘的ID是 49a426c8-6a9c-4047-a100-8ad07885952c
4、从数据库cinder库中，卸载云硬盘和虚拟机的挂载
1)、查看此云硬盘的信息
mysql> select * from volumes where id="49a426c8-6a9c-4047-a100-8ad07885952c";
+---------------------+---------------------+------------+---------+--------------------------------------+--------+----------------------------------+----------------------------------+----------+------+-------------------+--------------------------------------+------------+----------------------------+--------+---------------+---------------------+---------------------+---------------+--------------+---------------------+-------------------+---------------+--------------------------------------+--------------------------------------+--------------+----------+---------------+-------------------+----------+-------------------+------------------+
| created_at | updated_at | deleted_at | deleted | id | ec2_id | user_id | project_id | host | size | availability_zone | instance_uuid | mountpoint | attach_time | status | attach_status | scheduled_at | launched_at | terminated_at | display_name | display_description | provider_location | provider_auth | snapshot_id | volume_type_id | source_volid | bootable | attached_host | provider_geometry | _name_id | encryption_key_id | migration_status |
+---------------------+---------------------+------------+---------+--------------------------------------+--------+----------------------------------+----------------------------------+----------+------+-------------------+--------------------------------------+------------+----------------------------+--------+---------------+---------------------+---------------------+---------------+--------------+---------------------+-------------------+---------------+--------------------------------------+--------------------------------------+--------------+----------+---------------+-------------------+----------+-------------------+------------------+
| 2014-08-07 14:54:04 | 2014-08-07 14:54:08 | NULL | 0 | 49a426c8-6a9c-4047-a100-8ad07885952c | NULL | 84a36a3ff48a44e89ef2d29b05f902bf | 4c86beee9fee46038b979f11e9fc5520 | os-node1 | 100 | nova | 37767555-6f49-4f84-aa96-c08f176f10d3 | vda | 2014-08-07T14:54:08.052233 | in-use | attached | 2014-08-07 14:54:04 | 2014-08-07 14:54:05 | NULL | | | NULL | NULL | 128cfccf-b1aa-4778-b9c6-32d251d05b45 | 64efb028-794c-4a7c-9cdf-9e8895222fab | NULL | 1 | NULL | NULL | NULL | NULL | NULL |
+---------------------+---------------------+------------+---------+--------------------------------------+--------+----------------------------------+----------------------------------+----------+------+-------------------+--------------------------------------+------------+----------------------------+--------+---------------+---------------------+---------------------+---------------+--------------+---------------------+-------------------+---------------+--------------------------------------+--------------------------------------+--------------+----------+---------------+-------------------+----------+-------------------+------------------+
1 row in set (0.00 sec)
2）、卸载云硬盘和虚拟机的挂载关系
mysql> update volumes set instance_uuid=NULL where id="49a426c8-6a9c-4047-a100-8ad07885952c";
mysql> update volumes set mountpoint=NULL where id="49a426c8-6a9c-4047-a100-8ad07885952c";
mysql> update volumes set attach_time=NULL where id="49a426c8-6a9c-4047-a100-8ad07885952c";
mysql> update volumes set status="available" where id="49a426c8-6a9c-4047-a100-8ad07885952c";
mysql> update volumes set attach_status="detached" where id="49a426c8-6a9c-4047-a100-8ad07885952c";
mysql> update volumes set instance_uuid=NULL where id="49a426c8-6a9c-4047-a100-8ad07885952c";
Query OK, 1 row affected (0.02 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update volumes set mountpoint=NULL where id="49a426c8-6a9c-4047-a100-8ad07885952c";
Query OK, 1 row affected (0.01 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update volumes set attach_time=NULL where id="49a426c8-6a9c-4047-a100-8ad07885952c";
Query OK, 1 row affected (0.03 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update volumes set status="available" where id="49a426c8-6a9c-4047-a100-8ad07885952c";
Query OK, 1 row affected (0.02 sec)
Rows matched: 1 Changed: 1 Warnings: 0
mysql> update volumes set attach_status="detached" where id="49a426c8-6a9c-4047-a100-8ad07885952c";
Query OK, 1 row affected (0.02 sec)
Rows matched: 1 Changed: 1 Warnings: 0
3）、再次查看云硬盘的信息
mysql> select * from volumes where id="49a426c8-6a9c-4047-a100-8ad07885952c";
+---------------------+---------------------+------------+---------+--------------------------------------+--------+----------------------------------+----------------------------------+----------+------+-------------------+---------------+------------+-------------+-----------+---------------+---------------------+---------------------+---------------+--------------+---------------------+-------------------+---------------+--------------------------------------+--------------------------------------+--------------+----------+---------------+-------------------+----------+-------------------+------------------+
| created_at | updated_at | deleted_at | deleted | id | ec2_id | user_id | project_id | host | size | availability_zone | instance_uuid | mountpoint | attach_time | status | attach_status | scheduled_at | launched_at | terminated_at | display_name | display_description | provider_location | provider_auth | snapshot_id | volume_type_id | source_volid | bootable | attached_host | provider_geometry | _name_id | encryption_key_id | migration_status |
+---------------------+---------------------+------------+---------+--------------------------------------+--------+----------------------------------+----------------------------------+----------+------+-------------------+---------------+------------+-------------+-----------+---------------+---------------------+---------------------+---------------+--------------+---------------------+-------------------+---------------+--------------------------------------+--------------------------------------+--------------+----------+---------------+-------------------+----------+-------------------+------------------+
| 2014-08-07 14:54:04 | 2014-08-07 14:54:08 | NULL | 0 | 49a426c8-6a9c-4047-a100-8ad07885952c | NULL | 84a36a3ff48a44e89ef2d29b05f902bf | 4c86beee9fee46038b979f11e9fc5520 | os-node1 | 100 | nova | NULL | NULL | NULL | available | detached | 2014-08-07 14:54:04 | 2014-08-07 14:54:05 | NULL | | | NULL | NULL | 128cfccf-b1aa-4778-b9c6-32d251d05b45 | 64efb028-794c-4a7c-9cdf-9e8895222fab | NULL | 1 | NULL | NULL | NULL | NULL | NULL |
+---------------------+---------------------+------------+---------+--------------------------------------+--------+----------------------------------+----------------------------------+----------+------+-------------------+---------------+------------+-------------+-----------+---------------+---------------------+---------------------+---------------+--------------+---------------------+-------------------+---------------+--------------------------------------+--------------------------------------+--------------+----------+---------------+-------------------+----------+-------------------+------------------+
1 row in set (0.00 sec)
mysql>
5、在dashboard界面查看云硬盘的状态，此时就可以用这个云硬盘新建虚拟机了
6、用上面的云硬盘在其他的宿主机建立一个虚拟机恢复故障的虚拟机。
openstack宿主机故障时从云硬盘恢复虚拟机