Category Archives: Pacemaker

RHEL 6.4: Pacemaker 1.1.8, adding CMAN Support (and getting rid of “the plugin”)

Since RHEL6.0, pacemaker is shipped as a technology preview (TP). As explained in a blog post[1] from The Cluster Guy, you could choose between different setup for membership and quorum data, actually, three options. But since RHEL 6.4 and Pacemaker 1.1.8, in an attempt to move towards what is best supported by Red-Hat (CMAN), you [...]

Monitor a Pacemaker Cluster with ocf:pacemaker:ClusterMon and/or external-agent

If you want to monitor your Pacemaker cluster status and get alerted in real time on any cluster transition, you must define an ocf:pacemaker:ClusterMon resource[1]. This resource must be cloned and will run on all nodes of the cluster. It works by using crm_mon[2] in the background, which is a binary that provides a summary [...]

Linux-ha: moving from one corosync ring and no fencing to redundant rings and fencing(s)

I finally got time to move from a two nodes Linux-HA cluster running Pacemaker on top of Corosync with only one corosync ring and no fencing to redundant rings and IPMI fencing. Next step must be redundant hardware-level fencing (OS level fencing is worthless). Of course, every cluster should have at least two rings and [...]