How to open a firewall port in CentOS 7

This video shows how to open a port on CentOS 7 using the firwall-cmd tool.

Video: CentOS 7 Minimal Installation
https://youtu.be/t0n3t1o663w

Firewall open port command:
firewall-cmd –zone=public –add-port=80/tcp –permanent

Firewall reload command:
firewall-cmd –reload

source

centos 7