----- Am 15. Okt 2018 um 21:47 schrieb Peter Crowther peter.crowther@xxxxxxxxxxxx: > 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? But can i be sure that the resource starts on the node it was running before ? IMHO no. What is if i start the snapshot on node A but the resource starts afterwards on node B ? Then libvirt on node B does not know it should perform a snapshot. > On Mon, 15 Oct 2018, 20:36 Lentes, Bernd, < [ > mailto:bernd.lentes@xxxxxxxxxxxxxxxxxxxxx | bernd.lentes@xxxxxxxxxxxxxxxxxxxxx > ] > 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 Helmholtz Zentrum Muenchen Deutsches Forschungszentrum fuer Gesundheit und Umwelt (GmbH) Ingolstaedter Landstr. 1 85764 Neuherberg www.helmholtz-muenchen.de Aufsichtsratsvorsitzende: NN Stellv.Aufsichtsratsvorsitzender: MinDirig. Dr. Manfred Wolter Geschaeftsfuehrer: Prof. Dr. med. Dr. h.c. Matthias Tschoep, Heinrich Bassler, Dr. rer. nat. Alfons Enhsen Registergericht: Amtsgericht Muenchen HRB 6466 USt-IdNr: DE 129521671 _______________________________________________ libvirt-users mailing list libvirt-users@xxxxxxxxxx https://www.redhat.com/mailman/listinfo/libvirt-users
