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Redis Cache: Supercharging your WordPress website

In the world of web development and content management systems, speed and responsiveness are key factors in delivering an exceptional user experience. One powerful tool that can significantly enhance the performance of your WordPress website is Redis Cache. In this article, we’ll explore what Redis Cache is and how it can help turbocharge your WordPress site.

What is Redis Cache?
Redis Cache, often simply referred to as Redis, is an open-source, in-memory data store that can be used as a caching mechanism. It is known for its high-speed data retrieval and storage capabilities, making it an ideal solution for websites and applications that require rapid access to frequently used data.

How Redis Cache Works
Redis Cache operates on a simple principle: it stores frequently accessed data in memory, reducing the need to retrieve the same data from slower sources like databases or external APIs. Here’s how Redis Cache works:

  1. In-Memory storage
    Redis stores data in RAM (Random Access Memory), which is significantly faster than traditional disk-based storage systems. This allows for lightning-fast data retrieval.
  2. Key-Value store
    Redis is a key-value store, meaning you associate a unique key with each piece of data you want to cache. When you need that data, you can quickly retrieve it by referencing the key.
  3. Expiration and eviction
    You can set expiration times for cached data, ensuring that outdated information is automatically removed. Redis also supports eviction policies to manage memory usage when it reaches predefined limits.

How Redis Cache Benefits WordPress
Now, let’s dive into how Redis Cache can help your WordPress website:

  1. Speeds up page loading
    One of the most significant advantages of Redis Cache is its ability to dramatically reduce page load times. By caching frequently requested data, such as database queries or rendered pages, Redis ensures that your website responds quickly to user requests.
  2. Enhanced scalability: As your WordPress site grows and attracts more visitors, Redis Cache can help maintain performance and scalability. It can efficiently handle a higher number of concurrent users by reducing the strain on your server’s resources.
  3. Lower database load
    WordPress relies heavily on its database to store and retrieve content. Redis Cache reduces the number of database queries, resulting in lower database load and improved overall system stability.
  4. Improved user experience
    Faster loading times lead to a better user experience. Visitors are more likely to stay on your site, explore more pages, and engage with your content when they don’t have to wait for pages to load.
  5. Reduced server costs
    By reducing the workload on your web server and database, Redis Cache can help you optimize your server infrastructure. This may lead to cost savings by allowing you to host your website on more affordable server configurations.

In the following steps we will explain you how to install and how to activate Redis Cache in a DirectAdmin environment.

Step 1:
Log in to your WordPress backend of your website and then navigate to the “plugins” section. There, you click on “New plugin” in the menu on the left to search for a new plugin. Now, enter the following in the search bar at the top right: “redis object cache.” The following results will be displayed:

The first plugin you see is the plugin we need.

Step 2:
Download the Plugin “Redis Object Cache” and activate it.

After installing you have to activate the plugin “Redis Object Cache”

Step 3:
Open the plugin settings and you will see the following information:

Step 4:
Now you need to create a Redis database in your DirectAdmin environment. Click on the menu item “RedisCache” under advanced settings.

When you have clicked on the menu item “RedisCache” you will see the following information:

Once you’ve clicked on this, you’ll arrive at an overview page. Here, you will see the “Create RedisCache DB” button. Click on this button. Subsequently, a new database will be created, and you will see it listed. Click on this database so that it turns blue, then click on “Get RedisCache DB.” You will now be provided with login credentials, an IP address, and a port. Let’s save these details for reference.

Step 5:
Next, we need to input these details into our wp-config.php file. You can always find this file in the public_html directory of your WordPress installation. It contains, among other things, your MySQL database login credentials. In this guide, I will make these adjustments using DirectAdmin. To do this, click on “File manager” at the top of DirectAdmin.

Then, click on “domains” -> “yourdomain.com” -> “public_html.” Here, locate the wp-config.php file, which you will open for editing by clicking on the “Edit” button.

Next, insert the following lines:

define(‘WP_REDIS_HOST’, ‘**.0.**.1’);
define(‘WP_REDIS_PASSWORD’, ‘yourpassword’);
define(‘WP_REDIS_PORT’, ‘yourport’);
define(‘WP_REDIS_MAXTTL’, 60 * 60 * 24 * 5);

Above the following lines:

/** Sets up WordPress vars and included files. */
require_once(ABSPATH . ‘wp-settings.php’);

Once you have completed that step, you need to enable the Redis extension in your PHP settings. Instructions for enabling an extension are explained in our separate guide. You can skip this step if you are using PHP 7, as the Redis extension is enabled by default in PHP 7.

After you have checked the box for Redis and saved the changes on the PHP settings page, return to WordPress, where we still have the settings page for the Redis object cache open. Refresh this page, and you should see the data displayed that you just entered into the wp-config.php file of WordPress.

Step 6:
Check of Redis Cache is activated in PHPMyAdmin. Go under “Advanced Settings” in DirectAdmin to the menu link “Select PHP version” and click on that. When you use PHP 7.x then it is already activated, when not activate Redis Cache in the settings of PHP.

Step 7:
Activate Redis Cache now in WordPress. Go to the Redis Object Cache plugin en reload the page. After that you will see the following information:

Click on “Enable Object Cache” now. When you see the following information and/or page Redis Cache is succesfully installed on your hosting and in your WordPress environment!

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