rails docker development environment

docker-compose.yml

app:
  build: .
  environment:
    - DATABASE_USER=root
    - DATABASE_PASSWORD=root
    - DATABASE_HOST=database
  ports:
    - "3000"
  links:
    - database
    - redis
  volumes:
    - ./:/root/api/
database:
  image: mysql
  environment:
    - MYSQL_DATABASE=hackeyworks
    - MYSQL_ROOT_PASSWORD=root
redis:
  image: redis

Dockerfile

FROM ruby:2.3

RUN apt-get update && \
    apt-get install -y libmysqlclient-dev git gcc g++ make

RUN echo "gem: --no-document" > /root/.gemrc

RUN mkdir -p /root/app

VOLUME /root/app

EXPOSE 3000

WORKDIR /root/app

CMD bash