autojoin - enables automatic node joining

The autojoin directive enables nodes to join automatically just by communicating with the cluster, hence not requiring node[1] directives in the ha.cf[2] file. Since our communication is normally strongly authenticated, only nodes which know the cluster key can join (automatically or otherwise).

The general syntax of the autojoin directive is:

autojoin (none|other|any)

All legal autojoin directives are shown below:

autojoin none
autojoin other
autojoin any

The values you can give for the autojoin directive have the following meanings:

• none: disables automatic joining.

• other: allows nodes other than ourself who are not listed in ha.cf to join automatically. In other words, our node has to be listed in ha.cf[2], but other nodes do not.

• any: allows any node to join automatically without being listed in ha.cf[2], even the current node.

Note that the set of nodes currently considered part of the cluster is kept in the hostcache[3] file.

With autojoin enabled, the node[1] directive is no longer authoritative - the hostcache[3] file is.

---

This information provided courtesy of the Linux-HA project at http://linux-ha.org/