A little while ago I wrote a post on how to implement full page caching for a Rails app using Nginx and Redis; I have since replaced the single Redis instance with a memcached cluster and a middleware instead of Nginx to improve scalability and simplify things by removing some dependencies. Post: https://vitobotta.com/2020/10/04/full-page-caching-in-rails-part-2-memcached-and-middleware/