2009/5/20 Chris Lalancette <clala...@redhat.com> > Łukasz Mierzwa wrote: > > Dnia wtorek 19 maj 2009 o 22:20:06 Daniel P. Berrange napisał(a): > >> On Tue, May 19, 2009 at 09:29:15PM +0200, ??ukasz Mierzwa wrote: > >>> Hi, > >>> > >>> can someone explain me how migration works in libvirt? I got 2 machines > >>> with ubuntu 9.04 (libvirt 0.6.1 and kvm 84), disk images are stored on > >>> nfs share so both machines can access them. When I run live migration > >>> (virsh migrate --live domain uri) my domain is migrated to second host > >>> but: > >>> 1. domain is defined on both hosts after migration, it does not > disappear > >>> from original host > >>> 2. when I shutdown this domain on second host it gets undefined > >>> so I guess that migration is only temporary but this is not what I > want. > >>> When I migrate domain to other host I want it to stay there, how can I > do > >>> that? I can't find anything about it in documentation on libvirt > website, > >>> google does not seem to know anything either. > >> You need to distinguish between a persistent and transient guest. > >> A persistent guest has a config file, a transient guest does not. > >> > >> If the guest on the source host is persistent, then after migration > >> you should still see it on the source host as inactive. If it is > >> transient, then all trace should have gone after migration. > >> > >> If the destination does not already have a config file for the incoming > >> guest, then it will become a transient guest. Once you shut it down on > >> the destination, all trace will go away., If the destination has a > config > >> for the guest it will become persistent, and the guest should still > >> exist. > >> > >> Based on your description I'd say your source host had a persistent > guest, > >> and the destination host did not have a config, so after migration the > >> guest was transient. > >> > >> > >> Daniel > > > > So if I want my guest to be undefined from the source host and stay on > target > > host I need to define him on target host before migration? Some info in > 'virsh > > help migrate' would be nice, and maybe '--persistent' option to > auto-define it > > on target before migration. > > Thanks for help. > > Yeah, the persistent flag idea is a good one. I think people would find > that > useful, and it's fairly easy to implement. I'll give it a shot. >
When I try to migrate do destination host with domain defined on both, source and target, virsh just hangs on destination, migration does not finish and I can't connect anymore to libvirt on destination, I needed to SIGKILL it, SIGTERM did not stop it. It's 0.6.1 on ubuntu 9.04. Tried several times and it always hang. Łukasz Mierzwa
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