3:40 a.m.
On 06/10/2013 01:20 PM, Thomas Stein wrote:
Am 10.06.13 09:07, schrieb Kashyap Chamarthy:
> On 06/09/2013 02:46 PM, Thomas Stein wrote:
>> Hello.
>>
>> I just tried the following:
>>
>> virsh dumpxml --security-info gentoo-template > gentoo-template.xml
>> virsh snapshot-create gentoo-template
>> virsh undefine gentoo-template
>
> Wait - is that really the command you used after "snapshot-create" ?
> Because: You cannot undefine a guest with a snapshot without first deleting its
metadata
>
> To cleanly delete, maybe you should've done:
>
> $ virsh snapshot-delete --domain gentoo-template SNAPSHOTID --metadata
Did that. But that deletes that snapshot too, no?
Yes. (I just understood what you wanted to do). Noted my details below.
>
>> virsh blockcopy gentoo-template vda
>> /opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2 --wait --verbose
--finish
>> virsh define gentoo-template.xml
>
> Can you also paste the output of:
>
> $ qemu-img info --backing-chain \
> /opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2
hn ~ # qemu-img info --backing-chain
/opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2
image: /opt/virt-backup-blockcopy/gentoo-template/gentoo-template.qcow2
file format: qcow2
virtual size: 130G (139586437120 bytes)
disk size: 30G
cluster_size: 65536
Just to make myself clear. I want to backup the qcow image /with/ the
internal snapshot. Is that even possible with blockcopy?
Let's try. I just did the below test (also I noted it in the URL below)
# Take an (internal) snapshot when the guest was shutdown
$ virsh snapshot-list fed18
Name Creation Time State
------------------------------------------------------------
1370847718 2013-06-10 12:31:58 +0530 shutoff
# Start the guest
$ virsh start fed18
# Undefine the guest while it is running - this will
# make the guest transient (libvirt expects it to be 'transient')
$ virsh undefine fed18
Domain fed18 has been undefined
# List the guest
root@~$ virsh list
Id Name State
----------------------------------------------------
3 fed18 running
$
# Do blockcopy (it's only when the guest is "live")
$ virsh blockcopy --domain fed18 vda \
/export/backup/images/fed18.qcow2 --wait --finish --verbose
Block Copy: [ 100 %]
# Query the info of original image:
===========
root@~$ qemu-img info --backing-chain /var/lib/libvirt/images/el6box1.qcow2
image: /var/lib/libvirt/images/el6box1.qcow2
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 1.2G
cluster_size: 65536
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 1370853048 0 2013-06-10 14:00:48 00:00:00.000
===========
$ qemu-img snapshot -l /var/lib/libvirt/images/el6box1.qcow2
Snapshot list:
ID TAG VM SIZE DATE VM CLOCK
1 1370853048 0 2013-06-10 14:00:48 00:00:00.000
===========
# Query info of the backup:
===========
$ qemu-img info --backing-chain /export/backup/images/el6box1-back.qcow2
image: /export/backup/images/el6box1-back.qcow2
file format: qcow2
virtual size: 10G (10737418240 bytes)
disk size: 10G
cluster_size: 65536
===========
$ qemu-img snapshot -l /export/backup/images/el6box1-back.qcow2
===========
Hm, from what it looks, it doesn't appear to preserve the internal snapshot..
--
/kashyap