[libvirt] Using Restore in another host.

[Marcela Castro León]

Hello
This is the log I got doing the restore. It's says that it coun't get the
image, but the image is ok, because I can startup the guest.
Neither I can migrate the guest, so I suppose I've a problem in my
configuration.
Thank you very much in advance.
Marcela.

2011/4/5 Michal Novotny <minovotn at redhat.com>

> Hi Marcela,
> is any other guest on the host that cannot restore this VM working fine ?
>
> You could also try running the:
>
> */# LIBVIRT_DEBUG=1 virsh restore sv-chubut-2011-04-04-17:38 2>
> virsh-restore.log
>
> /*command which would enable the libvirt logging and output the debug
> log into the virsh-restore.log file. This file could be sent to the list
> for analysis what's wrong.
>
> Thanks,
> Michal
>
> On 04/05/2011 11:57 AM, Marcela Castro León wrote:
> > 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
> > <mailto: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
> >     --
> >     |: http://berrange.com      -o-
> >      http://www.flickr.com/photos/dberrange/ :|
> >     |: http://libvirt.org              -o-
> >     http://virt-manager.org :|
> >     |: http://autobuild.org       -o-
> >     http://search.cpan.org/~danberr/
> >     <http://search.cpan.org/%7Edanberr/> :|
> >     |: http://entangle-photo.org       -o-
> >     http://live.gnome.org/gtk-vnc :|
> >
> >
> >
> > --
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>
>
> --
> Michal Novotny <minovotn at redhat.com>, RHCE
> Virtualization Team (xen userspace), Red Hat
>
>
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