On Tue, Nov 29, 2011 at 6:55 AM, Andreas Ntaflos <d...@pseudoterminal.org> wrote: > Hi, > > Scenario: two physical virtualisation hosts run various KVM-based > virtual machines, managed by Libvirt. Two VMs, one on each host, form a > Pacemaker cluster, say for a simple database server, using DRBD and a > virtual/cluster IP address. Using Ubuntu 10.04 and Pacemaker 1.1.6, with > Corosync 1.4.2 on the hosts and guests. > > How do I implement node-level fencing in this scenario? > > Can the rather new "external/libvirt" STONITH plugin be used here? It > seems to me it only supports a single hypervisor URI to connect to and > expects all VMs/nodes that can be fenced to be running on the same > hypervisor. > > Looking at http://www.clusterlabs.org/wiki/Guest_Fencing it says that > fencing guests running on multiple hosts is not supported in > fence-virt/fence-virtd. > > What are my options here? How do other people manage node-level > fencing/STONITH when the nodes are VMs and running on different physical > hosts (which seems like the sensible thing to do, considering a single > host is a SPOF)? > > Sorta related question: are Pacemaker clusters based on virtual machines > (and Libvirt) really so uncommon that there isn't a quasi-definitive > answer to this? Like "If you use Libvirt, implement fencing by using > this or that STONITH plugin."
You could try fence_xvm or fence_virt from the RHCS set of stonith agents (which pacemaker also supports). I believe it also handles the case when the guest could be on one of multiple hosts, personally I only use it for a single host. Lon might have some documentation pointers... > > Thanks in advance, > > Andreas > > _______________________________________________ > Pacemaker mailing list: Pacemaker@oss.clusterlabs.org > http://oss.clusterlabs.org/mailman/listinfo/pacemaker > > Project Home: http://www.clusterlabs.org > Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf > Bugs: http://bugs.clusterlabs.org > _______________________________________________ Pacemaker mailing list: Pacemaker@oss.clusterlabs.org http://oss.clusterlabs.org/mailman/listinfo/pacemaker Project Home: http://www.clusterlabs.org Getting started: http://www.clusterlabs.org/doc/Cluster_from_Scratch.pdf Bugs: http://bugs.clusterlabs.org
