利用libvirt创建KVM虚拟机快照

说明：本文生成的快照文件会添加到虚拟机的系统卷中，这中快照成为内部快照。关于外部快照下次再补充。

1、列出所有运行的虚拟机

virsh # list  Id    名称                         状态 ----------------------------------------------------  2     r-74-VM                        running  3     v-80-VM                        running  4     s-71-VM                        running  5     i-2-82-VM                      running  15    i-2-122-VM                     running  18    i-2-116-VM                     running  20    i-2-124-VM                     running

2、创建i-2-124-VM的快照（此时该虚拟机是暂停状态）

virsh # list  Id    名称                         状态 ----------------------------------------------------  2     r-74-VM                        running  3     v-80-VM                        running  4     s-71-VM                        running  5     i-2-82-VM                      running  15    i-2-122-VM                     running  18    i-2-116-VM                     running  20    i-2-124-VM                     暂停   virsh # snapshot-create i-2-124-VM 已生成域快照 1489570750

3、查看该虚拟机的快照

virsh # snapshot-list i-2-124-VM  名称               生成时间              状态 ------------------------------------------------------------  1489564623           2017-03-15 15:57:03 +0800 running  1489565976           2017-03-15 16:19:36 +0800 running  1489567237           2017-03-15 16:40:37 +0800 running  1489570750           2017-03-15 17:39:10 +0800 running

4、查看虚拟机系统卷的文件信息

[root@kvm1 ~]# qemu-img info /mnt/92ada4f6-16f1-3a33-bf22-76fbcd553c76/0b87dde1-5f7a-4af6-b429-6259a613204d image: /mnt/92ada4f6-16f1-3a33-bf22-76fbcd553c76/0b87dde1-5f7a-4af6-b429-6259a613204d file format: qcow2 virtual size: 5.0G (5368709120 bytes) disk size: 1.8G cluster_size: 65536 Snapshot list: ID        TAG                 VM SIZE                DATE       VM CLOCK 1         1489564623             234M 2017-03-15 15:57:03   00:04:16.512 2         1489565976             234M 2017-03-15 16:19:36   00:25:58.221 3         1489567237             234M 2017-03-15 16:40:37   00:14:08.801 4         1489570750             234M 2017-03-15 17:39:10   00:59:24.354 Format specific information:     compat: 1.1     lazy refcounts: false

5、恢复虚拟机到前一个快照

1	virsh # snapshot-revert i-2-124-VM 1489565976