查看虚拟机

root@tom:~# virsh list --all
 Id   Name             State
---------------------------------
 -    new_cas_free_1   shut off

创建快照

root@tom:~# virsh
Welcome to virsh, the virtualization interactive terminal.

Type:  'help' for help with commands
       'quit' to quit

virsh # snapshot-create-as new_cas_free_1 debian10_4c_16g_2t
Domain snapshot debian10_4c_16g_2t created
virsh # 
virsh # 

列出快照

virsh # snapshot-list new_cas_free_1
 Name                 Creation Time               State
-----------------------------------------------------------
 debian10_4c_16g_2t   2022-01-25 16:38:18 +0800   shutoff

查看快照信息

virsh # snapshot-info new_cas_free_1 debian10_4c_16g_2t
Name:           debian10_4c_16g_2t
Domain:         new_cas_free_1
Current:        yes
State:          shutoff
Location:       internal
Parent:         -
Children:       0
Descendants:    0
Metadata:       yes

恢复快照
我们只需要使用virsh snapshot-revert命令即可。
但是在使用virsh snapshot-revert命令恢复虚拟机centos状态之前，我们必须要把虚拟机关闭。
注意要使用virsh shutdown命令进行关闭虚拟机的话，一定要安装acpid服务。同时经过多次测试证明如果虚拟机有快照的话，就无法使用virsh shutdown/reboot，命令进行关机或者重启。

snapshot-revert new_cas_free_1  debian10_4c_16g_2t

删除快照

snapshot-delete new_cas_free_1  debian10_4c_16g_2t