CentOS

Setting up a static IP address in your RHEL or CentOS is straightforward. Prerequisite This how-to guide requires that you have administrative access to the Linux operating system. Steps Inside the RHEL Operating system, open the terminal and head to /etc/sysconfig/network-scripts. Using ls command, you can see the available network devices in the directory. cd /etc/sysconfig/network-scripts ls Use a text editor to edit the specific network device configuration ...

I tested this using CentOS 7 with firewalld service running. Get Default Zone To know the default zone, use this command firewall-cmd --get-default-zone Get Active Zones firewall-cmd --get-active-zones List Zone Services To check services, ports and settings on a specific zone, use this command firewall-cmd --zone=public --list-all Add a permanent port into a zone Adding a permanent TCP/UDP port in a specific zone. Example: opening MongoDB port ...