Ruby Docker Project

.env.web

RDS_HOSTNAME=db
RDS_USERNAME=root
RDS_PASSWORD=some_password

docker-compose.yml

db:
  image: mysql
  env_file:
    - '.env.db'

web:
  build: .
  command: bundle exec rails s -p 3000 -b '0.0.0.0'
  volumes:
    - .:/myapp
  ports:
    - "3000:3000"
  links:
    - db
  env_file:
    - '.env.web'

Dockerfile

FROM ruby:2.1.3

RUN apt-get update -qq && apt-get install -y build-essential libpq-dev cmake nodejs
RUN mkdir /myapp

WORKDIR /myapp

ADD . /myapp/

RUN bundle install