The Redis object cache is the type of cache solution suitable only for object cache. This type of cache stores data from database queries into a memory for fast access of data. It works so effectively with relational databases like MySQL, etc. When WordPress page is loaded it perform database queries to retrieve information it requires some time to perform database queries and by default Redis performed to store that database queries into a memory so that the page load time slight deceases hence you will get fast page loading times. You need to follow all the details so carefully to integrate the Redis object cache on your WordPress instances.

Step-1 (Install the Redis packages)
$ sudo apt-get install redis-server php-redis
Step-2 (Check that it is working or not)
$ sudo redis-cli

Type the given command> ping

Output> PONG

This means Redis works. Now type exit to exit from Redis-cli.

Step-3 (Setup max memory and its rules for Redis)
$ sudo vi /etc/redis/redis.conf

Find the given lines

# maxmemory

replace it with

maxmemory 256mb

after all edit done then :wq to save and exit

Step-4 (Restart the services to make changes in effect)
$ sudo systemctl restart redis-server
Step-5 (Add Redis cache to WordPress configuration file)

Now edit wp-config.php file and add these lines to the last of the file.

define( 'WP_CACHE', true );
define( 'WP_CACHE_KEY_SALT', 'techbrown.com' );

After that save and exit

Step-6 (Enable Redis object cache to your WordPress)

Finally you need to install the WordPress plugin – Redis Object Cache to enable the Redis object cache. After installation of plugin now you are ready to use the flush cache option from above plugin settings.

That’s all for now.

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