2.3. Enabling IP Ports

Before deploying the Red Hat High Availability Add-On, you must enable certain IP ports on the cluster nodes and on computers that run luci (the Conga user interface server). The following sections identify the IP ports to be enabled:

2.3.1. Enabling IP Ports on Cluster Nodes

To allow Red Hat High Availability Add-On nodes to communicate with each other, you must enable the IP ports assigned to certain Red Hat High Availability Add-On components. Table 2.1, “Enabled IP Ports on Red Hat High Availability Add-On Nodes” lists the IP port numbers, their respective protocols, and the components to which the port numbers are assigned. At each cluster node, enable IP ports according to Table 2.1, “Enabled IP Ports on Red Hat High Availability Add-On Nodes”. You can use system-config-firewall to enable the IP ports.

Table 2.1. Enabled IP Ports on Red Hat High Availability Add-On Nodes

IP Port Number	Protocol	Component
5404, 5405	UDP	`corosync/cman` (Cluster Manager)
11111	TCP	`ricci` (propagates updated cluster information)
21064	TCP	`dlm` (Distributed Lock Manager)
16851	TCP	`modclusterd`