How to Add a Port in Firewall Configuration on CentOS 7
November 16, 2022 ・0 comments ・Topic： linux
In this article we will see how to add a port in firewall configuration on centos 7.
We will be using the firewalld package for firewall configuration.
Firewall is a network security tool that provides network level security based on a set of rules. It has controls on incoming and outgoing traffic.
Follow the article How To Install Firewalld on CentOS 7 if the package is not already installed.
Overview of Steps:
- Install the firewalld package
- Check the service status
- Adding the required ports
- Reloading the Service
- Validate the Configuration
Detailed Steps:
Step 1. Install the firewalld package[root@localhost ~]# yum install firewalld
Step 2. Check the Service Status: Run the following command to check firewall running status:
[root@localhost ~]# firewall-cmd --stat
running
[root@localhost ~]#
Step 3. Adding Port: Run the following command to allow port in firewall:
[root@localhost ~]# firewall-cmd --permanent --zone=public --add-port=80/tcp
success
[root@localhost ~]#
Change the port and protocol (tcp/udp) as desired.
Step 4. Reloading the Service: Run the following command for soft reloading firewall service to reflect the changes:
Step 4. Reloading the Service: Run the following command for soft reloading firewall service to reflect the changes:
[root@localhost ~]# firewall-cmd --reload
success
[root@localhost ~]#
Step 5. Validate the Configuration: Run the following command to verify the configuration:
[root@localhost ~]# firewall-cmd --list-ports | grep 80
80/tcp
[root@localhost ~]#
Done!!! Port 80 is successfully allowed from Linux Firewall.
Note: Same process will be repeated whenever you want to add new ports to the firewall.
Note: Same process will be repeated whenever you want to add new ports to the firewall.
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