docker-compose.yml

# Docker-compose is useful for the development of your application. This automatically spins up
# a container based off the Dockerfile in the working dir and links it to a postgres instance. 
# Modify as necessary to suit your needs

web:
  build: .
  command: bundle exec rails s -p 3000 -b '0.0.0.0'
  volumes:
    - .:/home/rails/my-app
  ports:
    - "3000:3000"
  links:
    - db
  env_file:
    - '.env.web'
  environment:
    - RAILS_ENV=development
db:
  image: postgres:latest
  ports:
    - "5432:5432"
  env_file:
    - '.env.db'



# Regular command                |  Docker-compose command
#---------------------------------------------------------------------------------------
# bundle install                 |  docker-compose run web bundle install
# rails s                        |  docker-compose run web rails s
# rspec spec/path/to/spec.rb     |  docker-compose run web rspec spec/path/to/spec.rb
# RAILS_ENV=test rake db:create  |  docker-compose run -e RAILS_ENV=test web rake db:create
# tail -f log/development.log    |  docker-compose run web tail -f log/development.log