Caching

DPL-CMS relies on two levels of caching. Standard Drupal Core caching, and Varnish as an accelerating HTTP cache.

Drupal

The Drupal Core cache uses Redis as its storage backend. This takes the load off of the database-server that is typically shared with other sites.

Further more, as we rely on Varnish for all caching of anonymous traffic, the core Internal Page Cache module has been disabled.

Varnish

Varnish uses the standard Drupal VCL from lagoon.

The site is configured with the Varnish Purge module and configured with a cache-tags based purger that ensures that changes made to the site, is purged from Varnish instantly.

The configuration follows the Lagoon best practices - reference the Lagoon documentation on Varnish for further details.