ceph image快照功能

1、查看现有池

[root@ceph-client ~]# ceph osd lspools

0 rbd,

注意：另创建的pool name不可含有特殊字符，如“-”等

 

2、查看当前目录文件

[root@ceph-client mnt]# df -Th | grep rbd

/dev/rbd0             ext4       20G   44M   19G   1% /mnt

[root@ceph-client mnt]# ll

total 16

drwx------ 2 root root 16384 Feb 26 18:32 lost+found

 

3、创建image快照

[root@ceph-client mnt]# rbd ls

foo

列出rbd池中的image

 

[root@ceph-client mnt]# rbd snap create rbd/foo@foo_snap1

命令模式：rbd/foo@foo_snap1代表rbd池中foo镜像，快照取名foo_snap1

 

[root@ceph-client mnt]# rbd snap ls rbd/foo

SNAPID NAME          SIZE

     2 foo_snap1 20480 MB

 

4、测试快照

 

[root@ceph-client mnt]# touch test{1..5}.file

[root@ceph-client mnt]# ll

total 16

drwx------ 2 root root 16384 Feb 26 18:32 lost+found

-rw-r--r-- 1 root root     0 Feb 29 12:45 test1.file

-rw-r--r-- 1 root root     0 Feb 29 12:45 test2.file

-rw-r--r-- 1 root root     0 Feb 29 12:45 test3.file

-rw-r--r-- 1 root root     0 Feb 29 12:45 test4.file

-rw-r--r-- 1 root root     0 Feb 29 12:45 test5.file

 

回滚快照

需要先卸载rbd挂载

[root@ceph-client ~]# umount /mnt/

[root@ceph-client ~]# rbd unmap /dev/rbd0

 

执行回滚

[root@ceph-client ~]# rbd snap rollback rbd/foo@foo_snap1

Rolling back to snapshot: 100% complete...done.

 

重新挂载

[root@ceph-client ~]# rbd map rbd/foo

/dev/rbd0

[root@ceph-client ~]# mount /dev/rbd0 /mnt/

[root@ceph-client ~]# ll /mnt/

total 16

drwx------ 2 root root 16384 Feb 26 18:32 lost+found

 

验证成功

 

5、删除快照

 

[root@ceph-client ~]# rbd snap rm rbd/foo@foo_snap1

删除指定快照

 

[root@ceph-client ~]# rbd snap purge rbd/foo

删除所有快照

 

如果删除时报错“librbd: removing snapshot from header failed: (16) Device or resource busy”

执行如下：

 

[root@ceph-admin ~]# rbd snap ls images/9e196534-03e3-484f-bfab-764ef336d82a

SNAPID NAME     SIZE

     2 snap 12047 kB

 

[root@ceph-admin ~]# rbd snap rm images/9e196534-03e3-484f-bfab-764ef336d82a@snap

rbd: snapshot 'snap' is protected from removal.

2016-03-21 10:44:34.359028 7f155ac527c0 -1 librbd: removing snapshot from header failed: (16) Device or resource busy

 

[root@ceph-admin ~]# rbd snap unprotect images/9e196534-03e3-484f-bfab-764ef336d82a@snap

 

[root@ceph-admin ~]# rbd snap rm images/9e196534-03e3-484f-bfab-764ef336d82a@snap

 

[root@ceph-admin ~]# rbd snap ls images/9e196534-03e3-484f-bfab-764ef336d82a