Install Redis Server on CentOS

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Redis is an open-source, High-Performance, in-memory key-value store that is widely used for caching and data storage. In this guide, we will walk you through the process of installing Redis Server and the php-redis extension on an CentOS system. By the end of this tutorial, you’ll have a fully functional Redis Server and the ability to interact with it using PHP.

Prerequisites:
* A CentOS system (tested on CentOS 7,8).
* Access to a terminal with sudo privileges.
* Basic familiarity with the Linux command line.

Step 1: Update System Packages
Start by updating the package list and upgrading existing packages to their latest versions:

sudo yum update

Step 2: Install Redis Server
To install Redis on CentOS, use the following command:

sudo yum install redis

Step 3: Start and Enable Redis
After installation, start the Redis service and enable it to start on system boot:

sudo systemctl start redis
sudo systemctl enable redis

Step 4: Configure Redis (Optional)
The default Redis configuration usually works well, but you can make adjustments as needed. The configuration file is located at “/etc/redis.conf”.

Step 5: Install php-redis Extension
To integrate Redis with PHP, you need to install the php-redis extension. You can do this using the following steps:

sudo yum install php-redis

Step 6: Restart Web Server
After installing the php-redis extension, you need to restart your web server to ensure that the changes take effect. For Apache, use:

sudo systemctl restart httpd

For Nginx, use:

sudo systemctl restart nginx

Step 7: Verify Installation
To ensure that Redis and the php-redis extension are installed correctly, you can create a simple PHP script that connects to Redis and performs basic operations. Create a file named ‘test-redis.php’ in your web server’s document root and add the following code:

<?php
$redis = new Redis();
$redis->connect('127.0.0.1', 6379);
echo "Connection to Redis server successfully!";
$redis->set('my_key', 'Hello, Redis!');
echo "Stored value in Redis: " . $redis->get('my_key');
?>

Access the script via a web browser (http://your_server_ip/test-redis.php) to see if Redis is working as expected.

Congratulations! You have successfully installed Redis Server and the php-redis extension on your CentOS server. Redis can now be used as a powerful data store and caching mechanism for your PHP applications, enhancing their performance and scalability. Make sure to explore Redis documentation to fully leverage its capabilities in your projects.

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