kvm快照
1、查看磁盘格式
[root@node1 opt]# qemu-img info CentOS-7-x86_64.raw
image: CentOS-7-x86_64.raw
file format: raw
virtual size: 10G (10737418240 bytes)
disk size: 4.8G
2、关闭虚拟机
[root@node1 ~]# virsh shutdown CentOS-7-x86_64
3、转换磁盘
[root@node1 opt]# qemu-img convert -p -f raw -O qcow2 CentOS-7-x86_64.raw kvm133.qcow2
尖叫提示：-O必须大写 –p显示转换进度
4、查看磁盘信息
[root@node1 opt]# qemu-img info kvm133.qcow2
image: kvm133.qcow2
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 4.8G
cluster_size: 65536
Format specific information:
compat: 1.1
lazy refcounts: false
5、修改虚拟机配置文件
[root@node1 opt]# virsh edit CentOS-7-x86_64
image.png
6、创建快照
[root@node1 ~]# virsh snapshot-create CentOS-7-x86_64
Domain snapshot 1527036985 created
直接在磁盘上做快照
[root@node1 opt]# qemu-img snapshot kvm133.qcow2 -c snap1
7、查看虚拟机快照版本
[root@node1 ~]# virsh snapshot-list CentOS-7-x86_64
Name Creation Time State
------------------------------------------------------------
1526980621 2018-05-22 17:17:01 +0800 shutoff
1527036985 2018-05-23 08:56:25 +0800 shutoff
qemu-img方式查看磁盘的快照版本
[root@node1 opt]# qemu-img snapshot kvm33.qcow2 -l
8、查看虚拟机最新快照
[root@node1 ~]# virsh snapshot-current CentOS-7-x86_64
9、查看虚拟机磁盘镜像
[root@node1 ~]# qemu-img info /opt/kvm133.qcow2
image: /opt/kvm133.qcow2
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 4.9G
cluster_size: 65536
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 1526980621 0 2018-05-22 17:17:02 00:00:00.000
2 1527036985 0 2018-05-23 08:56:25 00:00:00.000
Format specific information:
compat: 1.1
lazy refcounts: false
10、查看快照配置文件
[root@node1 ~]# cd /var/lib/libvirt/qemu/snapshot/CentOS-7-x86_64
[root@node1 CentOS-7-x86_64]# ll
-rw------- 1 root root 4483 May 23 08:56 1526980621.xml
-rw------- 1 root root 4532 May 23 08:56 1527036985.xml
11、恢复快照
（1）恢复虚拟机快照必须关闭虚拟机
[root@node1 ~]# virsh shutdown CentOS-7-x86_64
[root@ node1 ~]# virsh list --all
Id Name State
-------------------------------------------------------------------------------
- CentOS-7-x86_64 shut off
（2）确认虚拟机是否关闭
[root@node1 ~]# virsh domstate CentOS-7-x86_64
shut off
（3）查看虚拟机可以恢复的快照
[root@node1 ~]# virsh snapshot-list CentOS-7-x86_64
Name Creation Time State
--------------------------------------------------------------------------------------------
1526980621 2018-05-22 17:17:01 +0800 shutoff
1527036985 2018-05-23 08:56:25 +0800 shutoff
qemu-img方式查看磁盘的快照版本
[root@node1 opt]# qemu-img snapshot kvm33.qcow2 -l
（4）执行恢复快照，并确认一下版本
[root@node1 ~]# virsh snapshot-revert CentOS-7-x86_64 1526980621
[root@node1 ~]# virsh snapshot-current CentOS-7-x86_64
使用qemu-img还原快照
[root@node1 opt]# qemu-img snapshot test.qcow2 -a 1526980621
（5）提取快照镜像作为单独的一个文件
[root@hadoop102 opt]# qemu-img convert -f qcow2 -O qcow2 -s 1526980621 kvm133.qcow2 kvm133-1526980621.qcow2
尖叫提示：参数-s用于指定需要提取的磁盘快照
12、删除虚拟机快照
（1）查看虚拟机快照
[root@node1 ~]# virsh snapshot-list CentOS-7-x86_64
Name Creation Time State
-------------------------------------------------------------------------------------------
1526980621 2018-05-22 17:17:01 +0800 shutoff
1527036985 2018-05-23 08:56:25 +0800 shutoff
qemu-img方式查看磁盘的快照版本
[root@node1 opt]# qemu-img snapshot kvm33.qcow2 -l
（2）删除快照
[root@node1 ~]# virsh snapshot-delete CentOS-7-x86_64 1527036985
Domain snapshot 1527036985 deleted
使用qemu-img方式删除快照
[root@node1 opt]# qemu-img snapshot kvm133.qcow2 -d snap1
（3）再次查看虚拟机快照
[root@node1 ~]# virsh snapshot-list CentOS-7-x86_64
Name Creation Time State
-------------------------------------------------------------------------------------------
1526980621 2018-05-22 17:17:01 +0800 shutoff
qemu-img方式查看磁盘的快照版本
[root@node1 opt]# qemu-img snapshot kvm33.qcow2 -l