Docker Rails

docker-compose.yml

db:
  image: postgres:9.4.5
  ports:
    - "5432:5432"
  container_name:
    demo-db
web:
  build: .
  ports:
    - "3000:3000"
  volumes:
    - .:/var/www
  container_name:
    demo-web
  links:
    - db
  environment:
    RAILS_ENV: development

Dockerfile Rails

FROM ubuntu

ENV RAILS_PORT 3000
ENV RAILS_ENV "${APP_ENV}"
ENV RAILS_ROOT "/var/www"

RUN apt-get update && \
    apt-get install -yq \
        git-core \
        curl \
        zlib1g-dev \
        build-essential \
        libssl-dev \
        libreadline-dev \
        libyaml-dev \
        libsqlite3-dev \
        sqlite3 \
        libxml2-dev \
        libxslt1-dev \
        libcurl4-openssl-dev \
        python-software-properties \
        libffi-dev \
        libpq-dev \
    && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*

RUN wget http://ftp.ruby-lang.org/pub/ruby/2.2/ruby-2.2.3.tar.gz && \
    tar -xzvf ./ruby-2.2.3.tar.gz && \
    rm -rf ./ruby-2.2.3.tar.gz && \
    cd ./ruby-2.2.3/ && \
    ./configure && \
    make && \
    sudo make install

RUN echo "gem: --no-ri --no-rdoc" > ~/.gemrc && \
    gem install bundler && \
    gem install rails -v 4.2.5 && \
    mkdir -p ${RAILS_ROOT} && \
    rails new ${RAILS_ROOT}

WORKDIR ${RAILS_ROOT}
ADD Gemfile /${RAILS_ROOT}/Gemfile
ADD Gemfile.lock /${RAILS_ROOT}/Gemfile.lock
RUN bundle install
ADD . /${RAILS_ROOT}

EXPOSE ${RAILS_PORT}

CMD ["rails", "server", "-b", "0.0.0.0"]

Dockerfile Ubuntu

FROM ubuntu:14.04

ENV DEBIAN_FRONTEND "noninteractive"

RUN apt-get update && \
    apt-get install -yq vim nano git wget curl zip && \
    apt-get clean && \
    rm -rf /var/lib/apt/lists/* /tmp/* /var/tmp/*