How To Add Ports In The Firewall Rules On CentOS 7

How To Add Ports In The Firewall Rules On CentOS 7

How to add ports, we can allow and check open ports in firewall Linux but you can also block the port. Firewall defines the rules for your server where you allow or block the ports using the rule defined in the file and filters the traffic.

This is most important to configure and control the traffic or access to the server. 

Check Out: Useful Commands Of Firewall

Step 1: you can check port allowed in the firewall

As you can see there is only one port added in my machine which is for PostgreSQL.

How To Add Ports

Let’s suppose, we have to add port 80 in firewall using firewalld command in 
RedHat 7 version and you can use iptables in RedHat version 6.

you can add port 80 and protocol TCP that's for the webserver.
firewall-cmd --permanent --zone=public --add-port=80/tcp

In a similar way, you can also add the service instead of the port number.
firewall-cmd --permanent --zone=public --add-service=http/tcp

allow port in firewall

We have added port 80 of httpd in firewall it will work until you do not reload the
firewall.

firewall-cmd –reload

port allow in linux

Check Out: Enable/Disable Firewall

Step 2: Check port added in firewall 
firewall-cmd --list-ports

Step 3: Now restart the service of the firewall. 
systemctl restart firewalld

That’s it.

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I'm the founder of Curious Viral. I hope this blog will provide you complete information about Linux Technology & I would like to share my technical knowledge with you which I have learned during this period.

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