This container is a simple (1 service) registration container, which is designed to health check 1 or more linked containers and register them for synapse.
Example of how you would use this container, first you start the application:
docker run -d you/testservice --expose 8080 --name testservice1
and then
docker run -d -e NERVE_APP=testservice --link zookeeper:zk --link testservice1:testservice1 --name testservice-registration bobtfish/nerve-etcd