KVM Snapshot Management

KVM Snapshot Management

1. Create a Snapshot
Virsh snapshot-create Daixuan1

[Email protected] ~]# Virsh snapshot-create daixuan1

Domain Snapshot 1455801179 created

View Snapshots

[Email protected] ~]# qemu-img info/data/daixuan1. Qcow2

Image:/data/daixuan1.qcow2

File Format:qcow2

Virtual size:10g (10737418240 bytes)

Disk size:10g

cluster_size:65536

Snapshot list:

ID TAG vm SIZE DATE VM CLOCK

1 1455801179 0 2016-02-18 21:12:59 00:00:00.000

Note: Disk mirroring conversion format, creating snapshots

Create Snapshot if error:
Unsupported configuration:internal snapshot for disk Vdas unsupported for storage type raw
This is because the daixuan1.img file is not a snapshot of the image in raw format, so you need to convert the format first to see the current sub-machine disk image format

Qemu-img info/data/centos6.6_1.img
The result is:
Image:/data/centos6.6_1.img
File format:Raw (the format must be qcow2 before you can take a snapshot)
Virtual size:30g (32212254720 bytes)
Disk size:1.6g

Convert RAW format to Qcow format (in fact, copy one):
qemu-img convert-f raw-o qcow2/data/centos6.6_1.img/data/centos6.6_1.qcow2
-F Raw Original format

-O qcow2 Conversion format

Qemu-img Info/data/centos6.6_1.qcow2//View the format again, the results are as follows
Image:/data/centos6.6_1.qcow2
File format:Qcow2
Virtual size:30g (32212254720 bytes)
Disk size:1.1g
cluster_size:65536

Now we also need to edit the sub-machine configuration file so that it uses the new format of the vdisk image file
Virsh Edit Centos6.6_1//This will enter the sub-machine configuration file, equivalent to use the following VI

Vi/etc/libvirt/qemu/centos6.6_1

(/etc/libvirt/qemu/centos6.6_1.xml), with the same use of vim editing this file
The places to be modified are:
<drivername= ' qemu ' type= ' raw 'Cache= ' None '/>
<sourcefile= '/data/centos6.6_1.img '/>

Switch
<drivername= ' qemu ' type= ' Qcow2 'Cache= ' None '/>
<sourcefile= '/data/centos6.6_1.qcow2 '/>

Continue creating snapshots
Virsh snapshot-create Centos6.6_1//This time the success, prompted the following
Domain Snapshot 1437248443 created


2. List snapshots:

[Email protected] ~]# Virsh snapshot-list daixuan1

Name Creation time Status

------------------------------------------------------------

1455801179 2016-02-18 21:12:59 +0800 shutoff

3. Recovering snapshots

You need to shut down the sub-machine first
Virsh Destroy Daixuan1

Confirm that the sub-machine is off
Virsh domstate Daixuan1
Shut down

[Email protected] ~]# Virsh snapshot-revert daixuan1 1455801179

[Email protected] ~]# Virsh snapshot-list daixuan1//Result Yes

Name Creation time Status

------------------------------------------------------------

1455801179 2016-02-18 21:12:59 +0800 shutoff

4. View the snapshot version of the current sub-machine:

[Email protected] ~]# Virsh snapshot-current daixuan1

<domainsnapshot>

<name>1455801179</name>

5. Deleting snapshots

[Email protected] ~]# Virsh snapshot-delete daixuan1 1455801179

Domain Snapshot 1455801179 deleted

[Email protected] ~]# Virsh snapshot-list daixuan1

Name Creation time Status

Snapshot files for Daixuan1 sub-machine in/var/lib/libvirt/qemu/snapshot/daixuan1/directory

[[email protected] ~]# ls/var/lib/libvirt/qemu/snapshot/daixuan1///No snapshots already

This article is from the "Daixuan" blog, make sure to keep this source http://daixuan.blog.51cto.com/5426657/1743044

KVM Snapshot Management