How do you configure a firewall in CentOS 7? Securing our networks in today’s digital age is more critical than ever. With the increasing threat of cyber attacks, we must understand the importance of firewalls in protecting our networks.
What is Firewall?
A firewall is a security device that monitors and controls incoming and outgoing network traffic based on predetermined security rules. It acts as a barrier between a trusted and untrusted network, such as the Internet.
Configure Firewall in CentOS 7: Step-by-Step Guide
In this article, I will show you how to configure firewall service in CentOS 7 by using a firewalld daemon.
First, it needs to be installed on the package in linux
Step 1: Install epel-release
#yum install epel-release
Step 2: Download firewalld-daemon
#yum install firewalld -y
#firewall-cmd –zone=public –list-all
Step 3 : Run the below command to enable the firewall service.
#systemctl start firewalld
To Enable at boot :
#systemctl enable firewalld
Verfiy Firewall is Enable and Running on your System
Step 4 : Check current default zone
#firewall-cmd –get-default-zone
Step 5 : Check all available zones
#firewall-cmd –get-zones
Step 6 : Open up incoming http, https and ftpd traffic for public zone
#firewall-cmd –permanent –zone=public –add-service=http
#firewall-cmd –permanent –zone=public –add-service=https
#firewall-cmd –permanent –zone=public –add-service=ftpd
Step 7 : Open up incoming traffic with the help of port number
#firewall-cmd –add-port=80/tcp
#firewall-cmd –add-port=443/tcp
Step 8 : Activate the Apply add-rule
#firewall-cmd –reload
Step 9 : Check Display All Running Firewall Configuration
#firewall-cmd –zone=public –list-all
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