firewall-cmd

> The firewalld command-line client.

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

> This work is licensed under the Creative Commons Attribution 4.0 International License (CC-BY).

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