回复： Fwd: About libvirt domain snapshot problem(for single disk snapshot)

James Iter <james.iter.cn@xxxxxxxxx> · Thu, 22 Mar 2018 23:52:15 +0800

                My negligence。

-- 
James Iter

                在 2018年3月22日 星期四，下午11:02，Dominik Psenner 写道：

                    I believe that Your mail went to the wrong recipient. As far as I'm 
concerned it should have been sent to the libvirt-users mailing list, 
shouldn't it?

On 2018-03-22 15:55, James Iter wrote:
Thank your reply.
I found the method.
Now, I sharing to you.
When create snapshot, just add ’no’ value to the ’snapshot’ option with —diskspec.
As below:

``` bash
snapshot-create-as 8x0lbzvS --name sys_disk --disk-only --quiesce --atomic --diskspec "vda,snapshot=external" --diskspec "vdb,snapshot=no"
```

--
James Iter

在 2018年3月21日 星期三，下午6:24，Dominik Psenner 写道：

(shameless plug)

To do automated daily backups of a few machines I wrote a small toolset to get the job done and make it as less a hassle as you can get. The source is on github https://github.com/dpsenner/libvirt-administration-tools/. Use it if you find it useful.

Note that I have yet not tested it with multiple disks but the tool uses the output of `virsh dombklst`. In theory that should snapshot all disks of a guest machine.

Cheers
On Tue, 20 Mar 2018, 19:54 James Iter, <james.iter.cn@xxxxxxxxx (mailto:james.iter.cn@xxxxxxxxx)> wrote:

Hi, dear friends.
My guest has two disks, vda and vdb. both are qcow2 local file.
When guest running state.
I want to take the vda snapshot of guest(just vda, no include vdb). but I met libvirt do snapshot for all disks of guest.

About methods as follow:
1、
``` bash
virsh
snapshot-create-as 8x0lbzvS --name sys_disk3 --disk-only --diskspec "vda,snapshot=external"
```
``` result

[root@10k03 ~]# ls -lh /opt/Images/*sys_disk3

-rw-------. 1 qemu qemu 194K 3月  20 23:27 /opt/Images/00d76a58-9637-4402-9739-21afd1246e06.sys_disk3

-rw-------. 1 qemu qemu 704K 3月  20 23:52 /opt/Images/8d582c1c-355a-4297-9434-2f2f562c77df.sys_disk3

```

2、
``` python

#!/usr/bin/env python

# -*- coding: utf-8 -*-

import libvirt

import libvirt_qemu

import json

import sys

name = sys.argv[1]

print name

conn = libvirt.open()

dom = conn.lookupByName(name)

xml = """

<domainsnapshot>

<name>sysdisk_by_xml</name>

<description>By xml</description>

<disks>

<disk name='vda' snapshot='external'>

</disk>

</disks>

</domainsnapshot>

"""

flags = 0

flags |= libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_DISK_ONLY

flags |= libvirt.VIR_DOMAIN_SNAPSHOT_CREATE_QUIESCE

ret = dom.snapshotCreateXML(xmlDesc=xml, flags=flags)

```
``` result

[root@10k03 ~]# ls -lh /opt/Images/*sysdisk_by_xml

-rw-------. 1 qemu qemu 194K 3月  20 23:52 /opt/Images/00d76a58-9637-4402-9739-21afd1246e06.sysdisk_by_xml

-rw-------. 1 qemu qemu 1.2M 3月  21 00:03 /opt/Images/8d582c1c-355a-4297-9434-2f2f562c77df.sysdisk_by_xml

```
。

Then, I searched by google. see your page(https://www.redhat.com/archives/libvirt-users/2013-June/msg00102.html).

Now, I want to ask you, have you found the method?

--
James Iter

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