清除dashboard无法删除的虚拟机

故障现象：

因为一些原因，无法通过Dashboard删除某些虚拟机，这些虚拟机一直处于deleteing状态。



解决办法：

通过操作数据库直接删除实例记录：

[root@openstack ~]# mysql -uroot -ppasswd

mysql> show databases;

+--------------------+

| Database |

+--------------------+

| information_schema |

| cinder |

| glance |

| keystone |

| mysql |

| nova |

| test |

+--------------------+

7 rows in set (0.00 sec)

mysql> use nova;

……………………

Database changed

mysql> show tables;

mysql> select ID,display_name from instances;

+-----+--------------------------------------------+

| ID | display_name |

+-----+--------------------------------------------+

| 29 | vm-00 |

| 30 | vm-01 |

+-----+--------------------------------------------+

mysql> delete from instances where id = '29';

ERROR 1451 (23000): Cannot delete or update a parent row: a foreign key constraint fails (`nova`.`block_device_mapping`, CONSTRAINT `block_device_mapping_instance_uuid_fkey` FOREIGN KEY (`instance_uuid`) REFERENCES `instances` (`uuid`))

MySQL 删除 id 为 29 的 instance 时触发外键限制错误，简单的办法是暂时关闭外键检查，等删除后再打开。

mysql> SET FOREIGN_KEY_CHECKS=0;

mysql> delete from instances where id = '29';

mysql> delete from instances where id = '30';

mysql> SET FOREIGN_KEY_CHECKS=1;

mysql> flush privileges;

mysql> quit;