yum install firewalld systemd -y

firewall-cmd --list-all

systemctl start firewalld

firewall-cmd --query-port 80/tcp

firewall-cmd --zone=public --add-port=80/tcp --permanent

firewall-cmd --reload

firewall-cmd --list-all

firewall-cmd --zone=public --remove-port=9090/tcp --permanent

systemctl status firewalld.service

systemctl start firewalld.service

systemctl stop firewalld.service

systemctl restart firewalld.service

systemctl enable firewalld.service

systemctl disable firewalld.service

systemctl is-enabled firewalld.service