使用快照来迁移实例

作者：【吴业亮】云计算开发工程师
博客：http://blog.csdn.net/wylfengyujiancheng

1、创建一个实例的快照

为了保证所有的数据已经存储到硬盘，创建快照之前需要关闭源虚拟机。如果有必要，列出实例来浏览实例名称。

# openstack server list+--------------------------------------+------------+--------+------------------------------+------------+| ID                                   | Name       | Status | Networks                     | Image Name |+--------------------------------------+------------+--------+------------------------------+------------+| c41f3074-c82a-4837-8673-fa7e9fea7e11 | myInstance | ACTIVE | private=10.0.0.3             | cirros     |+--------------------------------------+------------+--------+------------------------------+------------+

2、关闭实例

# openstack server stop myInstance

3、使用:command:openstack server list命令来确保实例状态是``SHUTOFF：

# openstack server list+--------------------------------------+------------+---------+------------------+------------+| ID                                   | Name       | Status  | Networks         | Image Name |+--------------------------------------+------------+---------+------------------+------------+| c41f3074-c82a-4837-8673-fa7e9fea7e11 | myInstance | SHUTOFF | private=10.0.0.3 | cirros     |+--------------------------------------+------------+---------+------------------+------------+

4、Use the openstack server image create command to take a snapshot:

# openstack server image create myInstance --name myInstanceSnapshot

使用命令openstack image list来检查快照状态，直到状态是active：

# openstack image list+--------------------------------------+---------------------------------+--------+| ID                                   | Name                            | Status |+--------------------------------------+---------------------------------+--------+| 657ebb01-6fae-47dc-986a-e49c4dd8c433 | cirros-0.3.5-x86_64-uec         | active || 72074c6d-bf52-4a56-a61c-02a17bf3819b | cirros-0.3.5-x86_64-uec-kernel  | active || 3c5e5f06-637b-413e-90f6-ca7ed015ec9e | cirros-0.3.5-x86_64-uec-ramdisk | active || f30b204e-1ce6-40e7-b8d9-b353d4d84e7d | myInstanceSnapshot              | active |+--------------------------------------+---------------------------------+--------+

5、下载快照作为镜像

获得镜像标识：

# openstack image list+-------------------+-------------------+--------+| ID                | Name              | Status |+-------------------+-------------------+--------+| f30b204e-1ce6...  | myInstanceSnapshot| active |+-------------------+-------------------+--------+

通过使用在上一步中返回的镜像标识下载快照：

# openstack image save --file snapshot.raw f30b204e-1ce6-40e7-b8d9-b353d4d84e7d

通过HTTP或直接上传至机器（scp）的方式使得镜像在新环境中可用。

将快照导入到新环境中

6、在新项目或云环境导入快照

# openstack image create NEW_IMAGE_NAME \  --container-format bare --disk-format qcow2 --file IMAGE_URL

7、在新的项目或环境中，使用快照创建新的云主机：

# openstack server create --flavor m1.tiny --image myInstanceSnapshot myNewInstance