anchor.diff:  # servers
   RUN apt-get install -y redis-server redis-tools nginx postgresql-9.3 phppgadmin
   RUN apt-get install -y mysql-server phpmyadmin rabbitmq-server couchdb
  -RUN apt-get install -y apache2 php5 php5-fpm apache2-doc php-pear
  +RUN apt-get install -y apache2 php5 php5-fpm php5-mcrypt apache2-doc php-pear
  +RUN curl -sS https://getcomposer.org/installer | php && \
  +    mv composer.phar /usr/bin/composer
  +
  +# Mongodb
  +RUN sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10 && \
  +    echo "deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen" | sudo tee /etc/apt/sources.list.d/mongodb.list && \
  +    sudo apt-get update && \
  +    sudo apt-get install -y mongodb-org
   
   # tools
   RUN apt-get install -y dnsutils bash-completion xsltproc \
  
positive.code: # RUN ...
  RUN apt-get install -y pylint zip
  RUN sudo a2enmod rewrite
  RUN curl -sS https://getcomposer.org/installer | php
  RUN mv composer.phar /usr/bin/composer
  RUN apt-get install -y php5-mcrypt
  RUN apt-get install -y python3-pip
  RUN sudo apt-key adv --keyserver hkp://keyserver.ubuntu.com:80 --recv 7F0CEB10 && \
      echo "deb http://downloads-distro.mongodb.org/repo/ubuntu-upstart dist 10gen" | sudo tee /etc/apt/sources.list.d/mongodb.list && \
      sudo apt-get update && \
      sudo apt-get install -y mongodb-org
  
  # setup the system
  RUN echo -n "" > /etc/motd && \
  
negative.code:     bash -c "shopt -s dotglob && cp -a /tmp/homedir/* /home/ubuntu" && \
      rm -rf /tmp/homedir && \
      echo "Configure mongodb" && \
      sudo sed -i 's/journal=true/journal=false\nnojournal=true\nsmallfiles=true/' /etc/mongod.conf && \
      echo "Configure apache2" && \
      sudo sed -i 's/Listen 80\b/Listen 8080/' /etc/apache2/ports.conf && \
      ln -s /etc/apache2/sites-available/001-cloud9.conf /etc/apache2/sites-enabled && \
  