下面开始进行kvm虚拟机快照备份前的操作以及快照管理过程。
1，查看KVM虚拟机磁盘格式以及进行磁盘格式转换
1.1 查看KVM虚拟机磁盘格式
使用如下方法查看 qemu-img info linux66.img
[root@94ip vps]# qemu-img info linuxt66.img image: linuxt66.img file format: raw virtual size: 8.0G (8589934592 bytes) disk size: 8.0G<span style="font-family: 'microsoft yahei'; font-size: 14px; line-height: 24px; background-color: #ffffff;">1</span>
由于快照要使用，磁盘格式必须为qcow2，需要进行磁盘格式转换。
1.2 关闭虚拟机并转换磁盘
[root@94ip vps]# virsh destroy linux66 Domain linux66 destroyed [root@94ip vps]# virsh list --all Id Name State ---------------------------------------------------- 2 win2003 running 6 linux65 running - linux66 shut off [root@94ip vps]# ll total 11468860 -rwxr-xr-x 1 qemu qemu 8589934592 May 11 19:22 linuxt65.img -rwxr-xr-x 1 root root 8589934592 May 11 19:21 linuxt66.img -rwxr-xr-x 1 qemu qemu 10737418240 May 11 19:23 win2003.img [root@94ip vps]# qemu-img convert -f raw -O qcow2 linuxt66.img linuxt66.qcow2 [root@94ip vps]# [root@94ip vps]# ll total 12711880 -rwxr-xr-x 1 qemu qemu 8589934592 May 11 19:25 linuxt65.img -rwxr-xr-x 1 root root 8589934592 May 11 19:21 linuxt66.img -rw-r--r-- 1 root root 1272971264 May 11 19:24 linuxt66.qcow2 -rwxr-xr-x 1 qemu qemu 10737418240 May 11 19:25 win2003.img
转换完成。注意，这里的转换时针对源文件拷贝一份，并将格式转成qcow2。
1.3 修改配置文件，启用新格式磁盘。
virsh edit linux 进去搜索img 找到以后替换文件格式名：
<disk type=’file’ device=’disk’>
<driver name=’qemu’ type=’qcow2′ cache=’none’/>
<source file=’/home/vps/linuxt66.qcow2’/>
2，管理快照以及快照恢复
首先我们先查看下该快照命令用到了哪些：
[root@94ip ~]# virsh --help | grep snap iface-begin create a snapshot of current interfaces settings, which can be later committed (iface-commit) or restored (iface-rollback) Snapshot (help keyword 'snapshot') snapshot-create Create a snapshot from XML snapshot-create-as Create a snapshot from a set of args snapshot-current Get or set the current snapshot snapshot-delete Delete a domain snapshot snapshot-dumpxml Dump XML for a domain snapshot snapshot-edit edit XML for a snapshot snapshot-info snapshot information snapshot-list List snapshots for a domain snapshot-parent Get the name of the parent of a snapshot snapshot-revert Revert a domain to a snapshot
2.1 创建快照
根据上述命令，我们打算使用snapshot-cteate 来对linux66主机创建快照
[root@94ip vps]# virsh snapshot-create linux66 Domain snapshot 1463020507 created
查看快照列表
[root@94ip vps]# virsh snapshot-list linux66 Name Creation Time State ------------------------------------------------------------ 1463020507 2016-05-11 19:35:07 -0700 shutoff 1463020969 2016-05-11 19:42:49 -0700 shutoff
其中快照配置文件放到了/var/lib/libvirt/qemu/snapshot/
查看 最近的快照
virsh snapshot-current linux66
2.2 恢复快照
恢复快照之前必须先关闭虚拟机，我们可以先关闭以后并查看下快照列表，选中要恢复哪个快照。
[root@94ip snapshot]# virsh list --all Id Name State ---------------------------------------------------- 2 win2003 running 6 linux65 running - linux66 shut off [root@94ip snapshot]# virsh snapshot-list linux66 Name Creation Time State ------------------------------------------------------------ 1463020507 2016-05-11 19:35:07 -0700 shutoff 1463020969 2016-05-11 19:42:49 -0700 shutoff
比如我们这里恢复 1463020969这个快照。操作如下：
[root@94ip snapshot]# virsh snapshot-revert linux66 1463020969 [root@94ip snapshot]# virsh snapshot-current linux66 1463020969 shutoff 1463020507
恢复完成。
2.3快照删除
[root@94ip vps]# virsh snapshot-list linux66 Name Creation Time State ------------------------------------------------------------ 1463020507 2016-05-11 19:35:07 -0700 shutoff 1463020969 2016-05-11 19:42:49 -0700 shutoff [root@94ip vps]# virsh snapshot-delete linux66 1463020969 Domain snapshot 1463020969 deleted [root@94ip vps]# virsh snapshot-list linux66 Name Creation Time State ------------------------------------------------------------ 1463020507 2016-05-11 19:35:07 -0700 shutoff
转载请注明：IT运维空间 » 虚拟化 » Linux系统下kvm虚拟化（六）创建快照、恢复快照和删除快照
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