firewalld commands
- to check the server
sudo systemctl status firewalld
sudo systemctl start firewalld
sudo systemctl stop firewalld
sudo systemctl restart firewalld
firewall-cmd commands
- to list
firewall-cmd --list-all
firewall-cmd --list-services
firewall-cmd --list-ports
- to add
sudo firewall-cmd --zone=public --permanent --add-port=80/tcp
sudo firewall-cmd --reload
- to close
sudo firewall-cmd --zone=public --permanent --remove-port=80/tcp
sudo firewall-cmd --reload
