This image is based on the Trusted build linuxkonsult/chef-solo which in turn is based on the ubuntu base image.
The service is installed and configured with Chef. You can read here how to edit /etc/chef/node.json and run chef-solo to configure the service.
Edit create-db.rb to your liking. You can read more on how to customize/optimize your application here.
Any kind of feedback is highly appreciated!
Make contributions the usual way through GitHub, request changes and ask questions in comments below or email me directly at tom@linux-konsult.com.