firewall-cmd

The firewalld command-line client.

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• View the available firewall zones:

firewall-cmd --get-active-zones

• View the rules which are currently applied:

firewall-cmd --list-all

• Permanently move the interface into the block zone, effectively blocking all communication:

firewall-cmd --permanent --zone={block} --change-interface={enp1s0}

• Permanently open the port for a service in the specified zone (like port 443 when in the public zone):

firewall-cmd --permanent --zone={public} --add-service={https}

• Permanently close the port for a service in the specified zone (like port 80 when in the public zone):

firewall-cmd --permanent --zone={public} --remove-service={http}

• Permanently open two arbitrary ports in the specified zone:

firewall-cmd --permanent --zone={public} --add-port={25565/tcp} --add-port={19132/udp}

• Reload firewalld to force rule changes to take effect:

firewall-cmd --reload

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