The commands are for CentOS, but should work on Fedora and RedHat.
If semanage is not installed refer to here.
You would typically use this along with the systems firewall to allow a port through. Guide for firewalld and iptables. If you change it in the firewall and fail to add/edit it in semanage you can potentially get weird behavior like sshd not wanting to start after changing the port.
semanage port -a -t ssh_port_t tcp 2222
The above command allows the sshd service to start, using port 2222.
List allowed ports
semanage port -l
You can use grep to filter the results
[admin@localhost ~]# semanage port -l | grep ssh ssh_port_t tcp 2222, 22 [admin@localhost ~]#
semanage port -d -p tcp 2222
semanage port -a -t snmp_port_t tcp 2222