Examples of simple commands when configuring firewalld
sudo firewall-cmd --permanent --list-ports sudo firewall-cmd --permanent --list-service sudo firewall-cmd --permanent --list-all sudo firewall-cmd --get-active-zones sudo firewall-cmd --get-zone-of-interface=eth0 sudo firewall-cmd --permanent --zone=public --add-port=8080/tcp sudo firewall-cmd --permanent --zone=public --remove-port=8080/tcp sudo firewall-cmd --permanent --zone=public --add-service=http sudo firewall-cmd --permanent --zone=public --remove-service=http sudo firewall-cmd --permanent --zone=public --add-service=openvpn sudo firewall-cmd --permanent --zone=public --remove-service=openvpn sudo firewall-cmd --reload