snapshot 問題

1. Instance dyw.1 resize。

   [root@ip110 ~]# . demo.token 
   [root@ip110 ~]<demo># openstack server resize --flavor dyw.ce8 dyw.1
   

2. 錯誤訊息是 image 有 snapshot，無法 resize。

   [root@ip110 ~]<demo># openstack server show dyw.1
   +-----------------------------+----------------------------------------------------------+
   | Field                       | Value                                                    |
   +-----------------------------+----------------------------------------------------------+
   | OS-DCF:diskConfig           | MANUAL                                                   |
   | OS-EXT-AZ:availability_zone | nova                                                     |
   | OS-EXT-STS:power_state      | Running                                                  |
   | OS-EXT-STS:task_state       | None                                                     |
   | OS-EXT-STS:vm_state         | error                                                    |
   | OS-SRV-USG:launched_at      | 2020-06-20T07:40:39.000000                               |
   | OS-SRV-USG:terminated_at    | None                                                     |
   | accessIPv4                  |                                                          |
   | accessIPv6                  |                                                          |
   | addresses                   | selfservice=192.168.10.19                                |
   | config_drive                |                                                          |
   | created                     | 2019-09-22T22:45:48Z                                     |
   | fault                       | {u'message': u'Unexpected error while running command.\n
                                   Command: qemu-img resize /var/lib/nova/instances/
                                   29627608-17a4-48dc-9247-631e46e15ece/disk 32212254720\n
                                   Exit code: 1\nStdout: u\'\'\nStderr: u"qemu-img: Can\'t 
                                   resize an image which has snapshots\\n"', u'code': 500,
                                   u'created': u'2020-06-20T07:43:45Z'}                     
   | flavor                      | dyw.csa (3)                                              |
   | hostId                      | 71c30f5bf734c2046ae66e4ceec5af8350decb8905a171de520776a9 |
   | id                          | 29627608-17a4-48dc-9247-631e46e15ece                     |
   | image                       | dyw.csa8 (450e4793-19c2-421f-a60a-bd44518bc259)          |
   | key_name                    | rsa_key                                                  |
   | name                        | dyw.1                                                    |
   | project_id                  | 0abfdfea73d142d08192aab5cc051642                         |
   | properties                  | hw:passwd='85c04ca9', hw:port='5903'                     |
   | security_groups             | name='default'                                           |
   | status                      | ERROR                                                    |
   | updated                     | 2020-06-20T10:22:58Z                                     |
   | user_id                     | fdae41299d574ea59fc26bef4793885b                         |
   | volumes_attached            |                                                          |
   +-----------------------------+----------------------------------------------------------+
   

3. 查詢 dyw.1 的 image，確實有 snapshot。

   [root@ip110 ~]<demo># qemu-img info /var/lib/nova/instances/29627608-17a4-48dc-9247-631e46e15ece/disk
   image: /var/lib/nova/instances/29627608-17a4-48dc-9247-631e46e15ece/disk
   file format: qcow2
   virtual size: 16G (17179869184 bytes)
   disk size: 7.8G
   cluster_size: 65536
   backing file: /var/lib/nova/instances/_base/1058359c3f7c027c8cdca0b2c0c75b0789fd7d84
   Snapshot list:
   ID        TAG                 VM SIZE                DATE       VM CLOCK
   2         Original                  0 2020-05-20 17:55:58   00:00:00.000
   Format specific information:
       compat: 1.1
       lazy refcounts: false
       refcount bits: 16
       corrupt: false
   

4. 刪除 snapshot，2 是 snapshot 的 ID，但無法寫入。

   [root@ip110 ~]<demo># qemu-img snapshot -d 2 \
    /var/lib/nova/instances/29627608-17a4-48dc-9247-631e46e15ece/disk
   qemu-img: Could not open '/var/lib/nova/instances/29627608-17a4-48dc
   -9247-631e46e15ece/disk': Failed to get "write" lock
   Is another process using the image?
   

5. dyw.1 關機，再刪除 snapshot。

   [root@ip110 ~]<demo># openstack server stop dyw.1
   [root@ip110 ~]<demo># qemu-img snapshot -d 2 \
   /var/lib/nova/instances/29627608-17a4-48dc-9247-631e46e15ece/disk
   

6. 查詢 disk 已無 snapshot。

   [root@ip110 ~]<demo># qemu-img info \
   /var/lib/nova/instances/29627608-17a4-48dc-9247-631e46e15ece/disk
   image: /var/lib/nova/instances/29627608-17a4-48dc-9247-631e46e15ece/disk
   file format: qcow2
   virtual size: 16G (17179869184 bytes)
   disk size: 6.5G
   cluster_size: 65536
   backing file: /var/lib/nova/instances/_base/1058359c3f7c027c8cdca0b2c0c75b0789fd7d84
   Format specific information:
       compat: 1.1
       lazy refcounts: false
       refcount bits: 16
       corrupt: false
   

7. 重新啟動 dyw.1。

   [root@ip110 ~]<demo># openstack server reboot --hard dyw.1
   

8. 使用 flavor dyw.ce8，resize dyw.1。

   [root@ip110 ~]<demo># openstack server resize --wait --flavor dyw.ce8 dyw.1
   Complete
   clean_up ResizeServer: 
   END return value: 0
   

9. 查詢 dyw.1 的 flavor 已改成 dyw.ce8。

   [root@ip110 ~]<demo># openstack server list --name dyw.1$ \
   -cName -cFlavor -cImage -cStatus
   +-------+--------+----------+---------+
   | Name  | Status | Image    | Flavor  |
   +-------+--------+----------+---------+
   | dyw.1 | ACTIVE | dyw.csa8 | dyw.ce8 |
   +-------+--------+----------+---------+