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C.2. Enabling Pacemaker

C.2.1. Enabling Pacemaker For Corosync 2.x

High-level cluster management tools are available that can configure corosync for you. This document focuses on the lower-level details if you want to configure corosync yourself.
Corosync configuration is normally located in /etc/corosync/corosync.conf.

Example C.1. Corosync 2.x configuration file for two nodes myhost1 and myhost2

totem {
version: 2
secauth: off
cluster_name: mycluster
transport: udpu
}

nodelist {
  node {
        ring0_addr: myhost1
        nodeid: 1
       }
  node {
        ring0_addr: myhost2
        nodeid: 2
       }
}

quorum {
provider: corosync_votequorum
two_node: 1
}

logging {
to_syslog: yes
}

Example C.2. Corosync 2.x configuration file for three nodes myhost1, myhost2 and myhost3

totem {
version: 2
secauth: off
cluster_name: mycluster
transport: udpu
}

nodelist {
  node {
        ring0_addr: myhost1
        nodeid: 1
       }
  node {
        ring0_addr: myhost2
        nodeid: 2
       }
  node {
        ring0_addr: myhost3
        nodeid: 3
       }
}

quorum {
provider: corosync_votequorum

}

logging {
to_syslog: yes
}

In the above examples, the totem section defines what protocol version and options (including encryption) to use, [23] and gives the cluster a unique name (mycluster in these examples).
The node section lists the nodes in this cluster. (See Section 4.2, “Where Pacemaker Gets the Node Name” for how this affects pacemaker.)
The quorum section defines how the cluster uses quorum. The important thing is that two-node clusters must be handled specially, so two_node: 1 must be defined for two-node clusters (and only for two-node clusters).
The logging section should be self-explanatory.

[23] Please consult the Corosync website (http://www.corosync.org/) and documentation for details on enabling encryption and peer authentication for the cluster.