anchor.diff:  # tell Nginx to stay foregrounded
   RUN echo "daemon off;" >> /etc/nginx/nginx.conf
   
  +# Expose port 80 in the container.
   EXPOSE 80
   
  +# Start the nginx daemon every time the container starts with the -d flag and
  +# no argument is given.
   CMD ["nginx"]
  
positive.code: RUN add-apt-repository "deb http://archive.ubuntu.com/ubuntu $(lsb_release -sc) universe"
  RUN add-apt-repository ppa:nginx/stable
  
  RUN apt-get update -y
  RUN apt-get update -y --fix-missing
  
  
negative.code: # vi: set ft=sh :
  
  FROM ubuntu:12.04
  MAINTAINER Alberto Grespan "alberto@codehero.co"
  
  # Install add-apt-repository
  RUN apt-get install -y python-software-properties
  