Basic firewall-cmd commands

Something high up on my most googled list is how to open ports with firewalld. Below you can see how to open a port permanently.

• List all open ports:

  sudo firewall-cmd --list-all

• Open new port permanently:

  sudo firewall-cmd --zone=public --permanent --add-port=6789/tcp

• Reload firewalld for the change to take effect:

  sudo firewall-cmd --reload

• To show the actual iptables configuration use this command:

  sudo iptables -S