This CI server is so easy to get up and running, it's impressive! I'm more a fan of hosted solutions like Circle, Travis or Codeship but this is what I would use if I had the need to have my own CI installed.
btw, I'm not sure this still works, but I wrote a blog post on how to get from zero to a fully working Drone CI in less than 10 minutes, pretty sure it still works as the basics didn't change much.
http://jipiboily.com/2014/from-zero-to-fully-working-ci-serv...
Cheers