This is a method to run an ezstream icecast2 audio stream as a startup service within a Upstart init system. This method will also work for anything else which needs to run as a service.
I assume you have icecast2 installed and functioning: http://icecast.org/docs/icecast-2.2.0/basic-setup.html
Create a configuration file for ezstream in /etc/icecast2/ or in a project specific directory: