I use Docker in my dev environment. Points being:
- You dev machine doesn’t need to have dependencies other than Docker
- With Docker Compose I can easily grasp what other services (DBs, whatnots) that my app needs.
- I use OSX and most likely will need to deploy to Linux servers, so I use containers to build releases.
My first project (a Phoenix API) used Docker for deployment too, simply because the rest of the project was using it (and the ops team asked me to). As I watch and read many materials about Elixir, Erlang, and OTP, I have doubts; seems to me that Erlang/OTP provides many distribution and fault tolerance features that doesn’t play well if we’re using Docker (mainly because, yeah, the networking).
But I think I still wouldn’t dump Docker for my dev env 
It’s so cheaper than VMs.
