This page explains the nomenclature used in the cachoid control panel Warp.

FQDN is acronym for Fully Qualified Domain Name. www.example.com is an FQDN.  my.example.com is another FQDN. Cachoid is the name-brand of the service we offer. We also conveniently refer to each one of your virtual machines that runs Varnish Cache as a cachoid. Each cachoid handles the acceleration of exactly one FQDN. Sticking with the example.com cachoid, you could be running one or all of the following websites:

  • Main Website: http://example.com/
  • Blog: http://www.example.com/blog
  • Forum: http://www.example.com/forums
  • Shop: http://www.example.com/shop

Because these subpages (/, blog, forums, shop) are under the same FQDN, (www.) example.com, they are all served by the same Varnish Cache instance (or cachoid). But each subpage (ex: shop) can have its own caching rules. For example, you could set the pageapp for subpage /blog to WordPress and the pageapp for subpage /shop to Magento, etc.

You’ve probably noticed that I subtly introduced another new word: Pageapp. A pageapp is an attribute but also a configuration option that designates the behavior of Varnish Cache for a particular subpage.