View source for RHCS v3 cluster.conf

==== Element; altname ====
			
This provides a means of setting up a second, [[#rrp_mode|redundant]] <span class="code">[[#totem; Totem Ring and the Redundant Ring Protocol|totem]]</span> ring. This provides a means of communication between the nodes in the event of a failure of the primary ring, which could happen if a main switch failed. Without this, should the primary network fail, your nodes would all separate and there would be no way to gain quorum, stopping all hosted services. In corosync or openais, this would be known as ring number <span class="code">1</span>.

At the time of this writing, totem rings will not automatically recover after a failure. Please see the note in [[#rrp_mode|rrp_mode]] for information on how to manually recover a ring.

===== name =====

This is the host name that resolves to the interface connected to the network that the redundant ring will communicate on. All other nodes must have their redundant ring operating on the same network.

'''Q.''' Can this be the IP address of the interface the primary ring will run on instead of the hostname?

* No default
* Must be a host name that resolves to an IP of the interface the redundant ring will communicate on

===== port =====

This is the port used for the redundant ring communication.

'''Q.''' TCP and/or UDP? Must it be >1024? Is this the port that the multicast messages from the domU fence domain will come in on?

* Default is <span class="code">?</span>
* Must be a valid port number (<span class="code">1</span> to <span class="code">65535</span>)

===== mcast =====

This is the multicast address to use for the redundant ring communication.

'''Q.''' Are there similar recommendations or restriction as with the primary ring?

* Unknown default
* Must be a valid IPv4 or IPv6 multicast address

===== Example; altname =====

This is a typical configuration for a given node's redundant ring.

''Note'': This is showing just enough of the configuration to give the <span class="code">altname</span> entry context,
<source lang="xml">
	<clusternodes>
		<clusternode name="an-node01.alteeve.com" nodeid="1">
			<altname name="an-node01-sn" port="5406" mcast="239.192.122.46" />
		</clusternode>
		<clusternode name="an-node02.alteeve.com" nodeid="2">
			<altname name="an-node02-sn" port="5406" mcast="239.192.122.46" />
		</clusternode>
	</clusternodes>
</source>