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Hello,
this is tracking bug for adding firewall definitions for MySQL & MariaDB replication services.

The default port for MySQL & MariaDB database is 3306 - which is well known and already set in firewalld.

On the top of that, MariaDB Galera replication (for making database clusters) utilizes aditional ports.
This piece of documentation covers them:
http://galeracluster.com/documentation-webpages/firewalld.html

However since we already have "mysql" definition, I'd suggest to create the new one named "galera" or "mariadb-galera".
I'd split them like this beacuse I wouldn´t like to have replication ports opened when not using replication.

The RHEL-8 package is "galera" so we should call the service "galera" as well.



[root@rhel8 030]# dnf search galera
...
galera.x86_64 : Synchronous multi-master wsrep provider (replication engine)
...
mariadb-server-galera.x86_64 : The configuration files and scripts for galera replication

https://galeracluster.com/library/documentation/firewall-settings.html states that Galera Cluster multicast replication uses both UDP and TCP on port 4567, but the commit included in the above pull request only configures TCP.
(See also https://github.com/firewalld/firewalld/pull/724#discussion_r533666044 for related developer discussion.)

Is TCP-only OK?

Since the problem described in this bug report should be
resolved in a recent advisory, it has been closed with a
resolution of ERRATA.

For information on the advisory (firewalld bug fix and enhancement update), and where to find the updated
files, follow the link below.

If the solution does not work for you, open a new bug report.

https://access.redhat.com/errata/RHBA-2021:1643