1.2. Configuring the iptables Firewall to Allow Cluster Components
1.2. Configuring the iptables Firewall to Allow Cluster Components Table 1.1, "Ports to Enable for High Availability Add-On" shows the ports to enable for the Red Hat High Availability Add-On. Table 1.1. Ports to Enable for High Availability Add-On Port When Required TCP 2224 Required on all nodes (needed by the pcsd daemon) TCP 3121 Required on all nodes if the cluster has any Pacemaker Remote nodes TCP 21064 Required on all nodes if the cluster contains any resources requiring DLM (such as clvm or GFS2 ) UDP 5405 Required on all cluster nodes (needed by corosync ) UDP 5404 Required on cluster nodes if corosync is configured for multicast UDP