[ClusterLabs] VirtualDomain - unable to migrate

[Ondrej Mular]

On Tue, 4 Jan 2022 at 16:20, Ken Gaillot <kgaillot at redhat.com> wrote:
>
> On Wed, 2021-12-29 at 17:28 +0000, lejeczek via Users wrote:
> > Hi guys
> >
> > I'm having problems with cluster on new CentOS Stream 9 and
> > I'd be glad if you can share your thoughts.
> >
> > -> $ pcs resource move c8kubermaster2 swir
> > Location constraint to move resource 'c8kubermaster2' has
> > been created
> > Waiting for the cluster to apply configuration changes...
> > Location constraint created to move resource
> > 'c8kubermaster2' has been removed
> > Waiting for the cluster to apply configuration changes...
> > Error: resource 'c8kubermaster2' is running on node 'whale'
> > Error: Errors have occurred, therefore pcs is unable to continue
>
> pcs on CS9 moves the resource as normal, then runs a simulation to see
> what would happen if it removed the move-related constraint. If nothing
> would change (e.g. stickiness will keep the resource where it is), then
> it goes ahead and removes the constraint.
>
> I'm not sure what the error messages mean for that new approach. The
> pcs devs may be able to chime in.
I believe this is caused by a bug in the new implementation of `pcs
resource move` command. We have a fix for this almost ready, though,
some more testing is still needed. As you already filed a bugzilla
[0], let's track it there.

And thanks for bringing this up, it helped us to uncover a weird edge
case in the new implementation.

[0]: https://bugzilla.redhat.com/show_bug.cgi?id=2037218
>
> As a workaround, you can use crm_resource --move, which always leaves
> the constraint there.
Old move command is also still available as `pcs resource move-with-constraint`
>
> > Not much in pacemaker logs, perhaps nothing at all.
> > VM does migrate with 'virsh' just fine.
> >
> > -> $ pcs resource config c8kubermaster1
> >   Resource: c8kubermaster1 (class=ocf provider=heartbeat
> > type=VirtualDomain)
> >    Attributes:
> > config=/var/lib/pacemaker/conf.d/c8kubermaster1.xml
> > hypervisor=qemu:///system migration_transport=ssh
> >    Meta Attrs: allow-migrate=true failure-timeout=30s
> >    Operations: migrate_from interval=0s timeout=90s
> > (c8kubermaster1-migrate_from-interval-0s)
> >                migrate_to interval=0s timeout=90s
> > (c8kubermaster1-migrate_to-interval-0s)
> >                monitor interval=30s
> > (c8kubermaster1-monitor-interval-30s)
> >                start interval=0s timeout=60s
> > (c8kubermaster1-start-interval-0s)
> >                stop interval=0s timeout=60s
> > (c8kubermaster1-stop-interval-0s)
> >
> > Any and all suggestions & thoughts are much appreciated.
> > many thanks, L
>
> --
> Ken Gaillot <kgaillot at redhat.com>
>
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