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a) Configuring
Edit the /etc/my.cnf.d/mariadb-server.cnf file on your favorite text editor with superuser privileges. Suppose, you want the MariaDB server to listen on address 0.0.0.0, on port 12345. Under the file’s mysqld section, add or edit the lines below.
bind-address=0.0.0.0
port=123450.0.0.0 means all available IP addresses including localhost. If you want to bind only one IP address, you should write that one instead of the 0.0.0.0 address. If the port is not mentioned, the server will listen on its default port 3306.
b) Restarting
Restart the mariadb service.sudo systemctl restart mariadb.service
c) Adding Port To SELinux Policy Configuration
You should add the port to the policy configuration of the SELinux (Security Enhanced Linux).sudo semanage port -a -t mysqld_port_t -p tcp 12345
d) Making FirewallD to Allow
You may have to add the port to the FirewallD‘s allow list.sudo firewall-cmd --zone=public --permanent --add-port=12345/tcp
Then reload the firewalld.sudo firewall-cmd --reload
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