Just like caching the front-end static files play an important role in improving the site speed. Similarly, we need to cache the backend for enhancing server performance. Therefore, we will use the Redis Object Cache.
The Redis Object Cache helps in storing the complex MySQL queries on RAM memory. Hence, next time any similar query request, the Object cache will serve the output stored in RAM rather than hitting the fresh MySQL query. Thus, enhancing the overall speed and performance.
In this article, we are going to cover how to install and configure the Redis Server, and also enable the Redis Object Cache using the WordPress plugin.
Let’s dive into configuring the Redis object cache for WordPress blog —
Install Redis Server
Execute below command to update the APT repository of our Ubuntu Cloud Server.
sudo apt-get update
Install the redis-server as well as the php7.3-redis module for supporting the WordPress Object caching.
sudo apt-get install redis-server php7.3-redis
Configure Redis Server
Now that we have installed the Redis server, we will adjust the configuration file to improve its default configuration. Edit the redis.conf using below command:
sudo nano /etc/redis/redis.conf
And add the below lines to set the maximum memory limit the Redis Server should use for processing the Object Cache.
#You can adjust this value as you see fit - 200mb or 20000mb #it depends on how much RAM you have. On a 1GB server, I use 100mb. maxmemory 100mb # this forces old keys to be deleted using first-in-first-out maxmemory-policy allkeys-lru
Further down in the same configuration file. Comment out these lines in Redis to use only memory instead of the storage disk.
#save 900 1 #save 300 10 #save 60 10000
The SSD disk writing speed is quite low compared to RAM memory, hence we will be saving the Redis in RAM memory cache instead of disk.
Now, close the configuration file and restart the Redis server and php7.3-fpm using below command:
sudo service redis-server restart sudo service php7.3-fpm restart
The Redis server has been configured and running on the Ubuntu Cloud server.
Setup Redis Object Cache for WordPress
We have completed the backend setup of Redis Server. Now we will set up the Redis to run as Object Cache for WordPress Database queries.
Follow the below steps for Redis Object Cache on WordPress:
- Login to WordPress Dashboard
- Navigate to Add New under Plugin menu
- Search and Install Redis Object Cache by Till Kruss
- Activate the Plugin and navigate to Settings > Redis
- Hit on Enable Object Cache command button
- That’s it!
The Plugin will automatically add the required files in our WordPress server directory and enable the Redis Cache for MySQL database optimization.
Monitoring Redis Object Cache
We have completed the setup with Redis Server configuration as well as using it on WordPress for Object Cache. In order to monitor Redis Object Cache performance, we can run the following command in the SSH console.
This will output the real-time data of Object Caching used by WordPress.
Video of Redis Object Cache for WordPress
Watch the video demo of Redis Object Cache setup for WordPress blog. I’ve recorded the step by step guide of the entire Redis Server guide in this tutorial.
I hope you liked the video, please subscribe to our channel.
What’s next in the #CloudServer series?
Now that we’ve learned about setting up Redis Object Cache with WordPress. Next, we will go through managing the WordPress MySQL database using WP-Optimize Plugin.
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