I am looking to do the very same thing. So far I cant seem to find scripts
that will actually snapshot the VMs so the "files" can be backed up. I
have found a few that supposedly do so but they dont seem to work.
:(
What I am doing now is I am going to use the libvirt shutdown script to
shut them down, export /copy them to another mount point and back them up
with bacula and either stop the LVM host or restart the 2 VMs. (I have 2
projects)
On 21 November 2017 at 13:17, Bill Arlofski <waa-bac...@revpol.com> wrote:
> On 11/20/2017 03:27 PM, Josip Deanovic wrote:
> > On Monday 2017-11-20 11:45:09 Bill Arlofski wrote:
> > [...]
> >> Using a Runscript (with RunsWhen=before), you can have small script to
> >> tell the KVM hypervisor to perform a snapshot of a particular VM. Then,
> >> once the snapshot is complete, the job would backup the VM's config and
> >> disks, then in a second RunScript in the same Job configuration (with
> >> RunsWhen=after) the snapshot could be automatically removed.
> >
> > He is using qcow2 format.
> > I didn't use it for the last five years but back then creating and
> > removing snapshots with qcow2 was done inside the same image file
> > and by removing the snapshot the used space wasn't freed once it was
> > allocated.
> >
> > I don't know if that changed over the last five years but it would
> > be a good idea to test it before putting it into production and
> > automation.
> >
>
> Hello Josip,
>
> Yes, I think you are correct about this.
>
> I just checked on my Proxmox system (uses KVM for the hypervisor), and I
> see
> that when a VM is snapshotted, there is no additional disk snapshot file
> created.
>
> I had been remembering a script I wrote for Xen hypervisor VMs where I
> would
> first snapshot the VM, then, if that succeeded, there is a command to
> export
> the VM like:
>
> xe vm-export vm=snapshotID filename=someFileName
>
> And then my FileSet would point to the directory where these
> snapshotted/exported VMs were written to.
>
>
> On my Proxmox system, the qm command (the Qemu/KVM Virtual Machine Manager)
> has "snapshot" and "delsnapshot" commands, but does not seem to have a
> similar
> "vm-export" command to export the snapshotted VM to a dir where it may be
> backed up from.
>
> So, it would appear that if "image" backups of KVM VMs are desired, then
> the
> RunsWhen=before script would need to trigger a VM shutdown, and then the
> RunsWhen=after script would need to restart the VM.
>
> Not the most desirable way to backup VMs, to be sure. :(
>
> Thanks for your comment!
>
> Bill
>
> --
> Bill Arlofski
> http://www.revpol.com/bacula
> -- Not responsible for anything below this line --
>
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