[libvirt] Using Restore in another host.

[Marcela Castro León]

Hello Daniel
Thank you for all your information, but I still didn't solve the problem. I
tried the option you mention, with two differents guest into two differents
host, but all the cases I've got:

*virsh # restore sv-chubut-2011-04-04-17:38*
*error: Failed to restore domain from sv-chubut-2011-04-04-17:38*
*error: monitor socket did not show up.: Connection refused***

I cannot get any useful information (at least form me) on the log you
mention.
I'd appreciate a lot a new suggestion.
Thanks
Marcela




2011/4/4 Daniel P. Berrange <berrange at redhat.com>

> On Sun, Apr 03, 2011 at 10:43:45AM +0200, Marcela Castro León wrote:
> > Hello:
> > I need to know if I can use the restore operation (virsh o the equivalent
> in
> > libvirt) to recover a previous state of a guest, but recovered previously
> in
> > another host.
> > I did a test, but I got an error:
> >
> > The exactly sequence using virsh I testes is:
> > On [HOST SOURCE]: Using virsh
> > 1) save [domain] [file]
> > 2) restore file
> > 3) destroy [domain]
> >
> > On [HOST SOURCE] using ubuntu sh
> > 4) cp [guest.img] [guest.xml] [file] to HOST2
> >
> > On [HOST TARGET] using virsh
> > 5) define [guest.xml] (using image on destination in HOST2)
> > 6) restore [file]
>
> As a general rule you should only ever 'restore' from a
> file *once*. This is because after the first restore
> operation, the guest may have made writes to its disk.
> Restoring a second time the guest OS will likely have
> an inconsistent view of the disk & will cause filesystem
> corruption.
>
> If you want to be able to restore from a saved image
> multiple times, you need to also take a snapshot of
> the disk image at the same time, and restore that
> snapshot when restoring the memory image.
>
>
> That aside, saving on one host & restoring on a
> different host is fine. So if you leave out steps
> 2+3 in your example above, then your data would
> still be safe.
>
> > The restore troughs the following message:
> > *virsh # restore sv-chubut-2011-04-01-09:58
> > error: Failed to restore domain from sv-chubut-2011-04-01-09:58
> > error: monitor socket did not show up.: Connection refused*
>
> There is probably some configuration difference on your 2nd host
> that prevented the VM from starting up. If you're lucky the file
> /var/log/libvirt/qemu/$NAME.log will tell you more
>
> Daniel
> --
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