----- Original Message ----- > From: "Brad Jorgensen" <bjorgen...@sydcon.com> > To: pacema...@clusterlabs.org > Sent: Tuesday, August 20, 2013 12:04:30 PM > Subject: [Pacemaker] advanced clone operation serialization and requirements > > I'm using pacemaker (version 1.1.9-1512.el6-2a917dd with the cman stack) and > I want to add my MySQL cluster (actually MariaDB galera cluster) as a > managed resource. > > The problem I have is that the MySQL nodes must connect to an already > established cluster. This means that at least one node must be up in order > for others to join. The first node must bootstrap the cluster so it creates > a new cluster to which other nodes connect. If multiple servers bootstrap a > cluster, they create their own cluster, which creates split brains. > > I'd like pacemaker to block the resource on a monitor fail if no other > clones are running but restart if at least one other clone is running.
If the monitor fails, there is only a single action that can be associated with that failure, and there is no way to express some sort of conditional logic that determines what that action is. (see http://clusterlabs.org/doc/en-US/Pacemaker/1.1-pcs/html-single/Pacemaker_Explained/index.html#_monitoring_resources_for_failure) This probably isn't exactly what you're looking for, but what if you created a single MySQL instance that wasn't a clone, and left the other MySQL instances as a clone. You could make some sort of ordering constraint that wouldn't allow the clone instances to start until single MySQl instance exists. -- Vossel > It > would be even better if pacemaker could bootstrap one server if all of the > clones are down. > > Writing this out, I'm realizing how different this is from normal pacemaker > functionality and I'm less sure that there is an easy solution. I am going > to look into modifying the ocf scripts to implement this functionality, too. > Does anyone know if what I'm looking for is possible? > > > _______________________________________________ > 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
