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Enabling Redis Object Caching

September 02, 2022


Gaining Website Performance from Object Caching Technology


What is Web Caching in Web Design?

Web caching is a central design feature of your website's infrastructure meant to minimize network traffic while improving the perceived responsiveness of the site as a whole. In optimal web design, vaches are found at every level of a content's journey from the original server to the end user's browser.

What is the Benefit of a Caching System?

The primary purpose of an intentional caching system is to increase data retrieval performance by reducing the need to access the underlying slower storage layer. By trading off capacity for speed, a cache stores a subset of data temporarily, whereas other data stores and databases keep data in a comprehensive and durable form.

Improving Performance with Redis Object Caching

Object caching can improve database query performance both on the front end of your site and in wp-admin. Redis object caching is helpful for dynamic sites such as those running a membership site or WooCommerce.

Automatic Installation of Object Cache Pro


Redis object caching is enabled by default on all new sites. We automatically install the Object Cache Pro plugin to do this.

Manually Installing Object Cache Pro


If Redis object caching is not present on your site, you can install, activate and license it from the Nexcess Installer. If the Object Cache Pro plugin exists on the site, it can be activated from wp-admin or using a WP-CLI command:

wp plugin activate object-cache-pro

Also, check that the object-cache.php drop-in file exists in your site's wp-content folder.

Enabling Redis


To enable Redis from WP-CLI, then run this command:

wp redis enable

Forcing an Update of the Object Cache Drop-In File


To force an update of the object cache drop-in file if using the Object Cache Pro plugin, then use this WP-CLI command:

wp redis enable --force


The object cache drop-in can also be updated in wp-admin on the site from the following area in the user interface:

Settings > Object Cache

Checking the Redis Status


The WP-CLI command to check on the Redis status if using Object Cache Pro is:

wp redis info

The WP-CLI command to check on the Redis status if using Redis Object Cache:

wp redis status



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Flushing the Object Cache


Flushing the object cache will clear out your site's Redis object cache. This is the same as clearing the page cache, but in this case, it would be just for the object cache. To be able to flush the object cache, you will need to run this WP-CLI command from terminal or Putty on your site server:

wp cache flush


If you are using the Object Cache Pro plugin, then you can use this WP-CLI command to clear the cache:

wp redis flush


To asynchronously flush the object cache if using the Object Cache Pro, use the --async argument at the end of the WP-CLI command:

wp redis flush --async

You can also flush the object cache from Settings > Object Cache in wp-admin on the site if you use Object Cache Pro.

Settings > Object Cache


The object cache was flushed.


If you are using the Redis Object Cache plugin, then you can flush the object cache in wp-admin; then, you will need to go to the following area in the user interface:

Settings > Redis

Settings > Redis


Object cache flushed.



It is also possible to flush the object cache (applies for both Object Cache Pro and Redis Object Cache plugins) from the admin bar on your site. Click on the flush object cache section under the Nexcess logo in the admin bar. Taking this action will clear the Redis object cache from your site's server.

Nexcess Logo > Flush Object Cache



Checking that Redis Working


You can check that Redis is working if using Object Cache Pro on your site in wp-admin from the following area in the user interface:

Settings > Object Cache

Settings > Object Cache



To check if Redis is working in the Redis Object Cache plugin, then from wp-admin, go to the following area in the user interface:

Settings > Redis

Settings > Redis


Checking for the Current Version


To check that you are using the most current version of the Object Cache Pro plugin, then from wp-admin, go to the following area in the user interface:

Setting > Object Cache > Updates

Setting > Object Cache > Updates


Turning on Automatic Update for the Object Cache Pro Plugin


The Object Cache Pro plugin can be automatically updated with a new release from within wp-admin.

The Object Cache Pro plugin can be automatically updated with a new release from within wp-admin.


The WP-CLI command to set the Object Cache Pro plugin to be automatically updated:

wp plugin auto-updates enable object-cache-pro


If you are using the Redis Object Cache plugin, it can also be automatically updated. The WP-CLI command to set the Redis Object Cache plugin to be automatically updated:

wp plugin auto-updates enable redis-cache


Please contact support if you need any help with Redis object caching on your Managed WordPress or Managed WooCommerce sites.

Useful WordPress Links for Developers & Admins

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Note About the Original Publication Date

This article was originally published in February 2020. It has since been updated for accuracy and comprehensiveness.

Luke Cavanagh
Luke Cavanagh


Product Operations Manager at Nexcess. A devoted husband and tween wrangler. Synthwave enthusiast. Jerry Goldsmith fan. Doctor Who fan and related gubbins.