Installing OpenVPN on CentOS 7

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Summary: Learn how to install OpenVPN on CentOS 7 with this comprehensive step-by-step guide. From installing the necessary packages to configuring the VPN server, follow along to set up your secure network.
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Setting up a Virtual Private Network (VPN) on CentOS 7 can provide enhanced security and privacy for your network traffic. OpenVPN, a popular open-source VPN solution, offers robust encryption and flexibility. In this guide, we'll walk through the steps to install OpenVPN on CentOS 7.

Prerequisites:

A CentOS 7 server with root access.

A basic understanding of Linux terminal commands.

Step 1: Update System Packages
Before installing OpenVPN, it's essential to ensure your system is up-to-date. Run the following commands:

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Step 2: Install OpenVPN
OpenVPN is available in the default CentOS 7 repositories. Install it using yum:

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Step 3: Configure OpenVPN
After installation, navigate to the OpenVPN directory:

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Copy the example configuration file to create your server configuration:

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Step 4: Generate Server Certificates and Keys
OpenVPN requires cryptographic keys and certificates for secure communication. Use the provided EasyRSA script to generate them:

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Move into the EasyRSA directory:

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Initialize the PKI (Public Key Infrastructure):

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Build the Certificate Authority (CA):

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Generate server key and certificate:

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Step 5: Enable IP Forwarding
Enable IP forwarding to allow VPN traffic to pass through your CentOS server. Edit the sysctl.conf file:

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Uncomment the line:

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Then, apply the changes:

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Step 6: Start OpenVPN Service
Start and enable the OpenVPN service to ensure it starts automatically on boot:

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Step 7: Configure Firewall
If you have a firewall enabled, configure it to allow OpenVPN traffic. For example, using firewalld:

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Step 8: Client Configuration
Transfer the client configuration file to your local machine using a secure method like SCP (Secure Copy Protocol).

Step 9: Connect to OpenVPN Server
Use an OpenVPN client to connect to your server using the client configuration file.

Congratulations! You've successfully installed and configured OpenVPN on CentOS 7, providing a secure and private network connection for your server.