Dockerfile and docker-compose.yml for Rails Application

docker-compose.yml

db:
  image: postgres:9.4.4
web:
  build: .
  command: bundle exec rails s -p 3000 -b '0.0.0.0'
  volumes:
    - .:/myapp
  ports:
    - "3000:3000"
  links:
    - db

Dockerfile

FROM ruby:2.2.1
RUN apt-get update -qq && apt-get install -y build-essential

# for postgres
RUN apt-get install -y libpq-dev

# for capybara-webkit
RUN apt-get install -y libqt4-webkit libqt4-dev xvfb

# for a JS runtime
RUN apt-get install -y nodejs

RUN mkdir /myapp
WORKDIR /myapp
ADD Gemfile /myapp/Gemfile
ADD Gemfile.lock /myapp/Gemfile.lock
RUN bundle install
ADD . /myapp

run.sh

# build the container
docker-compose build

# setup the database
docker-compose run web rake db:setup

# run the application
docker-compose up

# open on your browser
# http://DOCKER_VM_IP:3000