Linux KVM Virtualization Manual Low-Level Guest Export/Import Procedure
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Internal
Overview
This is the procedure to snapshot a KVM virtual machine. It consists in taking snapshots of its XML definition and performing snapshots of all its storage devices.
Take a Virtual Machine Snapshot
If the virtual machine has more than one storage device attached, they all must be snapshot at the same time to produce a consistent snapshot that can be reverted to.
Shutdown the Target Guest
virsh shutdown <vm-name>
Identify all Storage Devices
virsh dumpxml <vm-name>
Look for <disk> definitions. The disk definition specifies the source and the format of the virtual storage device. Example:
<disk type='file' device='disk'>
<driver name='qemu' type='qcow2'/>
<source file='/main-storage-pool/appproxy.qcow2'/>
...
</disk>
Snapshot Each Storage Device
qemu-img snapshot -c <snapshot-tag> <volume-name>
For more details about snapshot mechanics, see
qemu-img snapshot -c
Restore from Snapshot
Perform the steps described in the "Take a Virtual Machine Snapshot" section in reverse order:
Restore the Content of Storage Device from Snapshot
qemu-img snapshot -a <snapshot-tag> <volume-name>
For more details about restoration mechanics, see
qemu-img snapshot -a
Alternative
Alternative suing qemu-img create. See