Update firewall on CentOS 7

open-network-port-through-firewall.txt

Taken from http://ask.xmodulo.com/open-port-firewall-centos-rhel.html

Open a Port on CentOS/RHEL 7

Starting with CentOS and RHEL 7, firewall rule settings are managed by firewalld service daemon. A command-line client called firewall-cmd can talk to this daemon to update firewall rules permanently.

To open up a new port (e.g., TCP/80) permanently, use these commands.

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

Without "--permanent" flag, the firewall rule would not persist across reboots.

Check the updated rules with:

$ firewall-cmd --list-all