Redis is a powerful open-source, in-memory data structure store that functions as a key-value store for strings, hashes, lists, sets, and sorted sets. Installing Redis and the PHP Redis extension on your cPanel server enables efficient caching and data storage for PHP applications without compromising performance.

Background

Redis leverages passive data caching to efficiently clear outdated content when updating with new information, allowing you to store substantial data volumes seamlessly. The PHP Redis extension provides the interface between your PHP applications and the Redis server.

How to Install Redis and PHP Redis

  1. Step 1: Access your server via SSH

    Log in to your cPanel server using SSH with root access.

  2. Step 2: Download Redis RPM files

    Execute the following commands to download the required RPM packages:

    wget http://dl.fedoraproject.org/pub/epel/6/x86_64/epel-release-6-8.noarch.rpm
wget http://rpms.famillecollet.com/enterprise/remi-release-6.rpm

  3. Step 3: Install Redis

    Run these commands to install Redis on your server:

    rpm -Uvh remi-release-6*.rpm epel-release-6*.rpm
yum install -y redis

  4. Step 4: Enable Redis to start on boot

    Execute the following command to ensure Redis starts automatically upon server reboot:

    chkconfig redis on

  5. Step 5: Configure Redis

    Open the Redis configuration file and add the following lines to the end:

    vi /etc/redis.conf

    Add these configuration lines:

    maxmemory 256mb
maxmemory-policy allkeys-lru

    This establishes the fundamental configurations for Redis on your server.

  6. Step 6: Access WHM

    Log in to WHM with root access.

  7. Step 7: Navigate to Module Installers

    Choose Software from the navigation menu, then select Module Installers.

    WHM Software menu

    WHM Module Installers

  8. Step 8: Manage PHP Pecl

    Choose Manage for PHP Pecl.

    WHM PHP Pecl Manage

  9. Step 9: Search for Redis module

    In the PHP Pecl Installer section, locate the area labeled "Find a PHP PECL". Enter redis in the Search box and click Go.

    WHM PHP Pecl search for Redis

  10. Step 10: Install PHP Redis extension

    The search results will display the relevant PHP Redis module. Click Install.

    WHM PHP Pecl install Redis

    This will install the PHP extension, serving as an interface for Redis.

  11. Step 11: Restart services

    To finalize the installation, execute the following commands in SSH to restart Redis and httpd:

    service httpd restart
service redis restart

    This ensures all changes take effect. The installation of Redis and PHP Redis on your cPanel server is now complete.