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Firewall Settings

Galera Cluster requires a number of ports to maintain network connectivity between the nodes. Depending on your deployment, you may not require all of these ports, but a cluster might require all of them on each node. Below is a list of these ports and their purpose:

• 3306 is the default port for MySQL client connections and State Snapshot Transfer using mysqldump for backups.
• 4567 is reserved for Galera Cluster Replication traffic. Multicast replication uses both TCP and UDP transport on this port.
• 4568 is the port for Incremental State Transfer.
• 4444 is used for all other State Snapshot Transfer.

How these ports are enabled for Galera Cluster can vary depending upon your operating system distribution and what you use to configure the firewall.

• Firewall Configuration with iptables
• Firewall Configuration with FirewallD
• Firewall Configuration with PF