[libvirt-users] Incremental Backups

[Thomas Stein]

Am 23.09.13 16:00, schrieb Daniel Berteaud:
> Le vendredi 20 septembre 2013 à 15:31 +0200, Thomas Stein a écrit :
>> Hello.
>> 
>> Is someone performing incremental backups via libvirt for qemu/kvm 
>> machines? I'm still having a hard time to
>> find a nice procedure. I mean is it possible to make a full backup of an 
>> image on monday a do the next days of the week
>> incremental backups?
> 
> You can take a look at this script:
> http://gitweb.firewall-services.com/?p=virt-backup;a=blob_plain;f=virt-backup;hb=HEAD

Hello Daniel.

Thank you but unfortunately i don't have a LVM setup.

cheers
t.

> I'm using it on several servers. You can either take a full backup (raw
> dd of your LV), or incremential backups. Incrementials are done this
> way:
> 
> - pause the VM
> - take an LVM snapshot of each of its disk
> - resume the VM
> - use chunkfs to mount the LVM snapshots as if it was a lot of small
> files
> - now you can rsync the fuse mount point using rsync, and only modified
> blocks will be transfered. If you use something like BackupPC or
> rsnapshot, it'll also only store on disk the modified blocks
> 
> 
> Regards, Daniel
>> 
>> Another way could be mount the image and rsync its contents. Does that 
>> makes sense?
>> 
>> Also i read in qemu changelog:
>> 
>> ---
>> Support for a new block device background job. Started by drive-backup, 
>> it will backup a disk's content to a new file. Unlike drive-mirror, the 
>> new file will include the source disk's content at the time the backup 
>> job was started. Atomic backup of multiple disks is supported using the 
>> "transaction" QMP command.
>> ---
>> 
>> Is this supported by libvirt?
>> 
>> thanks and best regards
>> thomas
>> 
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>