Re: [libvirt-users] Deploying libvirt with live migration

On Mon, 13 Dec 2010, Matthias Bolte wrote: > 2010/12/13 David Ehle <ehle(a)agni.phys.iit.edu&gt;: >> >> Even if your not sharing /etc/libvirt, if you have migrated at least >> once, >> both systems see the VM's as available for starting/running so just not >> sharing /etc/libvirt is not a solution to the problem/concern... > > Well, that depends on the flags you pass to the migrate command. The > default libvirt migration semantic is a bit unexpected as it leaves > the domain defined but in shutdown state on the source host and on the > destination host it's running as a transient guest. That's why I gave > it the --persistent --undefinesource flags to make it take it's config > with it. Thank you for explaining that - I usually use the gui admin tool so some of the details I'm oblivious too. > >> Ideally if you try to start a VM that is already running on a different >> host >> it should balk and you should get an (overridable) warning. (IMHO) > > There is ongoing work on a lock manager system for libvirt that shall > prevent two domains from using the same disk image at the same time. > That's not exactly what you're looking for but it's related. I think that would be more than sufficient ;) Is that project publicly accesible?  I might be interested in lending a hand :)

David. > > Matthias > >> David. >> >> On Mon, 13 Dec 2010, Scott Baker wrote: >> >>> On 12/13/2010 02:28 PM, Matthias Bolte wrote: >>>> >>>> Well don't share /etc/libvirt, there is no need to. >>>> >>>> Just have the domain config on the host that currently executes the >>>> domain and tell libvirt to migrate the persistent domain condif along >>>> with the domain: >>>> >>>> virsh migrate --persistent --undefinesource vm1 qemu://virt2/system >>> >>> I suppose that would work... but if Virt2 dies and I need to start its >>> VMs >>> on Virt1 those XML configs won't be there and it will make it more >>> complicated. >>> >>> Not just a simple "virsh start Foobar" >>> >>> -- >>> Scott Baker - Canby Telcom >>> System Administrator - RHCE - 503.266.8253 >>> >>> _______________________________________________ >>> libvirt-users mailing list >>> libvirt-users(a)redhat.com >>> https://www.redhat.com/mailman/listinfo/libvirt-users >>> >> >