tldr/pages/linux/firewall-cmd.md

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