[libvirt-users] snapshots with virsh in a pacemaker cluster

[Peter Crowther]

Pacemaker always knows where its resources are running. Query it, stop the
domain, then use the queried location as the host to which to issue the
snapshot?

Cheers,

Peter

On Mon, 15 Oct 2018, 20:36 Lentes, Bernd, <
bernd.lentes at helmholtz-muenchen.de> wrote:

> Hi,
>
> i have a two node cluster with virtual guests as resources.
> I'd like to snapshot the guests once in the night and thought i had a
> procedure.
> But i realize that things in a cluster are a bit more complicated than
> expected :-))
>
> I will shutdown the guests to have a clean snapshot.
> I can shutdown the guests via pacemaker.
> But then arises the first problem:
>
> When i issue a "virsh snapshot-create-as" libvirt needs the domain name as
> a parameter.
> but libvirt does not know the domains any longer. When the guests are
> shutdown a "virsh list --all"
> on both nodes does not show any domain.
>
> A look in the respective resource agent VirtualDomain explains why:
> The domain is started with virsh create:
>
> "# The 'create' command guarantees that the domain will be
> # undefined on shutdown, ...
>
> OK: Now i could of course define all domains with a virsh define.
>
> But then i have immediately the next problem. Now i'd create the snapshots
> with
> "virsh snapshot-create-as" and starts the domains afterwards via cluster.
> But let's assume i issue that on node 1 and some guests are started
> afterwards via pacemaker on node 2.
> I can't predict on which node the guests are starting.
>
> Then i don't get a snapshot, right ?
>
> What to do ?
>
> Bernd
>
>
>
> --
>
> Bernd Lentes
> Systemadministration
> Institut für Entwicklungsgenetik
> Gebäude 35.34 - Raum 208
> HelmholtzZentrum münchen
> [ mailto:bernd.lentes at helmholtz-muenchen.de |
> bernd.lentes at helmholtz-muenchen.de ]
> phone: +49 89 3187 1241
> fax: +49 89 3187 2294
> [ http://www.helmholtz-muenchen.de/idg |
> http://www.helmholtz-muenchen.de/idg ]
>
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> wer nichts macht kann auch nichts lernen
>
>
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