23.2.2 Configuring the Firewall

Configure or disable the firewall on each node to allow access on the interface that the cluster will use for private cluster communication. By default, the cluster uses both TCP and UDP over port 7777.

To allow incoming TCP connections and UDP datagrams on port 7777, use the following commands:

# firewall-cmd --zone=zone --add-port=7777/tcp --add-port=7777/udp
# firewall-cmd --permanent --zone=zone --add-port=7777/tcp --add-port=7777/udp