I was following this guide it documents the puma.rb file that is stored inside the app\'s config directory.
puma.rb
The guide is a bit flakey, but here\'s what
You need to tell puma where to find your rackup file you can do it by putting this in your config:
rackup
rackup DefaultRackup
It looks like a fix for this is merged into master: https://github.com/puma/puma/pull/271