Opening ports on CentOS 7 servers is a fundamental step to run various network applications or provide external access. However, it’s important to follow the correct steps and maintain security measures. In this guide, we will go through the steps to open ports on your CentOS 7 server step by step.

Step 1: Check Firewall Settings
CentOS 7 uses a tool called firewalld for firewall management. First, decide which ports you want to open and check the current firewall rules.

"firewall-cmd --list-all"

This command lists the current firewall rules. Check if the port you want to open is already allowed.

Step 2: Open the Port
Before opening a port, determine the protocol (TCP or UDP) of the port you want to open. For example, to open TCP port 80:

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

This command opens TCP port 80 and makes the change permanent.

Step 3: Reload the Firewall
Reload the firewall to apply the changes:

"sudo firewall-cmd --reload"

This command reloads the firewall settings and activates your changes immediately.

Step 4: Verify the Port is Open
Finally, verify that the port has been opened correctly by running:

"sudo firewall-cmd --list-all"

This will show the firewall rules and confirm whether the port is included.

Opening ports on CentOS 7 is straightforward but following the correct steps is crucial. By following this guide, you can successfully open ports and manage your server’s network access.

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