实验环境（client node1 node2）

1.建立一个存储v2并启用

gluster volume create v2 node1:/data/xx node2:/data/xx
gluster volume start v2

2.对v2做一个快照，首先查看一下快照的帮助。

[root@node1 ~]# gluster help | grep snapshot
snapshot help - display help for snapshot commands
snapshot create <snapname> <volname> [no-timestamp] [description <description>] [force] - Snapshot Create.
snapshot clone <clonename> <snapname> - Snapshot Clone.
snapshot restore <snapname> - Snapshot Restore.
snapshot status [(snapname | volume <volname>)] - Snapshot Status.
snapshot info [(snapname | volume <volname>)] - Snapshot Info.
snapshot list [volname] - Snapshot List.
snapshot config [volname] ([snap-max-hard-limit <count>] [snap-max-soft-limit <percent>]) | ([auto-delete <enable|disable>])| ([activate-on-create <enable|disable>]) - Snapshot Config.
snapshot delete (all | snapname | volume <volname>) - Snapshot Delete.
snapshot activate <snapname> [force] - Activate snapshot volume.
snapshot deactivate <snapname> - Deactivate snapshot volume.

3.把v2挂在到client上，创建20个文件。

[root@client ~]# mount node1:/v2 /v2
[root@client ~]# df -hT
文件系统       类型      容量  已用  可用 已用% 挂载点
/dev/vda1      xfs        20G  1.3G   19G    7% /
devtmpfs       devtmpfs  488M     0  488M    0% /dev
tmpfs          tmpfs     497M     0  497M    0% /dev/shm
tmpfs          tmpfs     497M  6.7M  490M    2% /run
tmpfs          tmpfs     497M     0  497M    0% /sys/fs/cgroup
tmpfs          tmpfs     100M     0  100M    0% /run/user/0
node1:/v2      nfs       2.0G   33M  2.0G    2% /v2

[root@client ~]# touch /v2/aa{1..20}.txt

4.对v2建立一个快照

[root@node1 ~]# gluster snapshot create backupv2 v2

5.查看这个快照

[root@node1 ~]# gluster snapshot list
backupv2_GMT-2020.02.03-03.35.12

6.client中删除20个文件，node1中没有任何的数据

[root@client v2]# rm -rf /v2/*

[root@node1 ~]# ls /data/xx/
[root@node1 ~]# 

7.卸载client挂载的v2卷，然后停止v2卷，做快照恢复。

[root@client /]# umount /v2/
[root@node1 ~]# gluster volume stop v2

[root@node1 ~]# gluster snapshot restore backupv2_GMT-2020.02.04-02.33.56
Restore operation will replace the original volume with the snapshotted volume. Do you still want to continue? (y/n) y
Snapshot restore: backupv2_GMT-2020.02.04-02.33.56: Snap restored successfully

8.开启v2卷并挂载到client查看数据

[root@node1 ~]# gluster volume start v2
[root@client /]# mount node1:/v2 /v2
[root@client /]# cd /v2/
[root@client v2]# ls
aa10.txt  aa13.txt  aa16.txt  aa19.txt  aa2.txt  aa5.txt  aa8.txt
aa11.txt  aa14.txt  aa17.txt  aa1.txt   aa3.txt  aa6.txt  aa9.txt
aa12.txt  aa15.txt  aa18.txt  aa20.txt  aa4.txt  aa7.txt