In this article, we explore how to enable and start firewalld on your CentOS 7 server using the commands in our article. Firewalld is a firewall management tool for Linux operating systems.
Video by Justin Palmer
Link to KB article: https://www.liquidweb.com/kb/how-to-start-and-enable-firewalld-on-centos-7/
systemctl enable firewalld
systemctl start firewalld
systemctl status firewalld
Publisher: Liquid Web
You can watch this video also at the source.