FROM ubuntu:trusty RUN apt-get update RUN apt-get install -yq ruby ruby-dev build-essential RUN gem install --no-ri --no-rdoc bundler ADD Gemfile /app/Gemfile ADD Gemfile.lock /app/Gemfile.lock RUN cd /app; bundle install ADD . /app EXPOSE 4567 WORKDIR /app CMD ["bundle", "exec", "middleman", "server"]