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://entangle-photo.org -o- http://live.gnome.org/gtk-vnc :|