In CentOS 7 or RHEL 7 or Fedora, firewalls are managed by firewalld

Add

firewall-cmd --zone=public --add-port=80/tcp --permanent (--permanent is permanent and expires after reboot without this parameter)

firewall-cmd --zone=public --add-port=1000-2000/tcp --permanent

Reload

firewall-cmd --reload

View

firewall-cmd --zone=public --query-port=80/tcp

Delete

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

Turn on Firewall

systemctl start firewalld.service

Turn off firewall

systemctl stop firewalld.service

View running status

firewall-cmd --state //running