redis

There are a number of scenarios in Drupal 8 where you might notice your MySQL database size starts growing incredibly fast, even if you're not adding any content. Most often, in my experience, the problem stems from a exponentially-increasing-in-size cache_render table. I've had enough private conversations about this issue that I figure I'd write this blog post to cover common scenarios, as well as short and long-term fixes if you run into this issue.

Consider the following scenarios I've seen where a cache_render table increased to 10, 50, 100 GB or more:

One of the motivations behind Drupal VM is flexibility in local development environments. When you develop many different kinds of Drupal sites you need to be able to adapt your environment to the needs of the site—some sites use Memcached and Varnish, others use Solr, and yet others cache data in Redis!

Drupal VM has recently gained much more flexibility in that it now allows configuration options like:

• Choose either Ubuntu or CentOS as your operating system.
• Choose either Nginx or Apahe as your webserver.
• Choose either MySQL or MariaDB for your database.
• Choose either Memcached or Redis as a caching layer.
• Add on extra software like Apache Solr, Node.js, Ruby, Varnish, Xhprof, and more.

Out of the box, Drupal VM installs Drupal 8 on Ubuntu 14.04 with PHP 5.6 (the most stable release as of December 2015) and MySQL. We're going to make a few quick changes to config.yml so we can run the following local development stack on top of CentOS 7:

Configure Drupal VM

To get started, download or clone a copy of Drupal VM, and follow the Quick Start Guide, but before you run vagrant up (step 2, #6), edit config.yml and make the following changes/additions: