KVM虚拟机快照

KVM默认的文件格式是raw，也就是使用文件来模拟实际的硬盘(当然也可以使用一块真实的硬盘或一个分区)，不过raw格式只支持内存快照(就是启动的 时候加-snapshot，所有更改都写到内存)，重启之后就没了。

raw格式不支持磁盘快照，因此要使用qcow或qcow2文件格式。

 

1、kvm创建快照

创建快照有两个命令都能实现

 

a、snapshot-create

# virsh snapshot-create rhel6.3

Domain snapshot 1420722577 created

# virsh snapshot-list rhel6.3
Name                 Creation Time             State
------------------------------------------------------------
1420722577           2015-01-08 21:09:37 +0800 running

 

b、 snapshot-create-as

# virsh snapshot-create-as rhel6.3 before-install-vnc

Domain snapshot before-install-vnc created

# virsh snapshot-list rhel6.3
Name                 Creation Time             State
------------------------------------------------------------
before-install-vnc   2015-01-08 21:16:05 +0800 running

 

可以看出使用snapshot-create-as可以自定义快照名

 

2、kvm删除快照

# virsh snapshot-delete rhel6.3 1420722577
Domain snapshot 1420722577 deleted

 

3、kvm恢复快照

# virsh snapshot-revert rhel6.3 before-install-vnc
error: revert requires force: Target controller type ide does not match source usb

注意：恢复虚拟机状态之前，我们必须要把虚拟机关闭

 

# virsh shutdown rhel6.3
Domain rhel6.3 is being shutdown

# virsh snapshot-revert rhel6.3 before-install-vnc（//快照名）

# virsh list --all

Id    Name                           State
----------------------------------------------------
3     xp                             running
7     rhel6.3                        running                              //快照恢复完成后自动打开了电源

 

4、kvm快照相关命令

# virsh --help | grep snapshot
    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