Installation of MariaDB with Galera Cluster requires several additional SELinux settings. The following description applies to MariaDB installations downloaded from https://downloads.mariadb.org/
Galera Cluster uses the following network ports for network communication by default:
3306/tcp - Standard MySQL/MariaDB port for client connection and SST (State Snapshot Transfers) using mysqldump method. 4567/tcp/udp - Galera replication traffic port. Under normal circumstances, only uses tcp. If you use multicast replication, both tcp and udp are used.