Example dockerfile for rails app

Dockerfile

FROM ruby:2.2

MAINTAINER Alvaro F. Lara <alvaro.lara@alliants.com>

ENV HOME /home/app
ENV RAILS_ENV development

EXPOSE 8080

RUN useradd -m -s /bin/bash app

RUN apt-get update && apt-get install -y ca-certificates build-essential libmysqlclient-dev ruby-mysql

RUN gem install -N bundler

ADD . /home/app/
WORKDIR /home/app

RUN bundle install

RUN ln -sf /config/database.yml $HOME/config/database.yml
RUN ln -sf $HOME/log /log

RUN echo '#!/bin/bash \n bundle exec rake db:migrate; bundle exec unicorn -c ./config/unicorn.rb -E RAILS_ENV' > /home/app/startup.sh; \
    chmod +x /home/app/startup.sh

CMD ["/home/app/startup.sh"]