anchor.diff:  RUN rpm -Uvh http://nginx.org/packages/centos/7/noarch/RPMS/$( \
     curl http://nginx.org/packages/centos/7/noarch/RPMS/ | \
     grep -Po 'nginx-release.*?\.rpm' | head -1)
  -  
  +
   # Install
   # - supervisord for monitoring
   # - nginx for reverse-proxying
  
positive.code: # Base image for other DIT4C platform images
  FROM centos:centos7
  MAINTAINER t.dettrick@uq.edu.au
  
  # Update all packages
  RUN yum upgrade -y
  
negative.code: 
  # Home & log dirs should be exportable
  VOLUME ["/home/researcher", "/var/log"]
  