2.3. Enabling IP Ports

Before deploying a Red Hat Cluster, 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 Cluster nodes to communicate with each other, you must enable the IP ports assigned to certain Red Hat Cluster components. Table 2.1, “Enabled IP Ports on Red Hat Cluster 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 Cluster Nodes”.


IPV6 is not supported for Cluster Suite in Red Hat Enterprise Linux 5.

Table 2.1. Enabled IP Ports on Red Hat Cluster Nodes

IP Port NumberProtocolComponent
5404, 5405 UDP cman (Cluster Manager)
11111 TCP ricci (part of Conga remote agent)
14567 TCP gnbd (Global Network Block Device)
16851 TCP modclusterd (part of Conga remote agent)
21064 TCP dlm (Distributed Lock Manager)
50006, 50008, 50009 TCP ccsd (Cluster Configuration System daemon)
50007 UDP ccsd (Cluster Configuration System daemon)


Table 2.1, “Enabled IP Ports on Red Hat Cluster Nodes” shows no IP ports to enable for rgmanager. For Red Hat Enterprise Linux 5.1 and later, rgmanager does not use TCP or UDP sockets.