firewalld

Start firewalld

systemctl start firewalld.service

Stop firewalld

systemctl stop firewalld.service

Restart firewalld

systemctl restart firewalld.service

Check opened ports

firewall-cmd –list-all

Open port 80

firewall-cmd –permanent –add-port=80/tcp

Open port range

firewall-cmd –permanent –add-port=10000-10010/tcp

Close port 80

firewall-cmd –permanent –remove-port=80/tcp

Reload settings

firewall-cmd –reload