anchor.diff: -#
  -# MongoDB Dockerfile
  -#
  -# https://github.com/dockerfile/mongodb
  -#
  -
   # Pull base image.
   FROM dockerfile/ubuntu
   
  
positive.code: # Define default command.
  CMD ["bash"]
  
  # Next: Volt
  RUN \
  gem install volt
  
  # Next: Git, bundle
  RUN \
  apt-get install git && apt-get install bundler \
  cd appname
  bundle install
  
  
negative.code: EXPOSE 27017
  EXPOSE 28017
  
  # Install Ruby.
  RUN \
    apt-get update && \
  