So you built your shiny new microservice, and now you want to deploy and have other code talk to it. But how will other code find it or even know that it exists? And if you recognize that one of anything is a risk to your availability, how you can enable clients to find the instance of your service that is running. For many people today the answer is a wiki documents machines and instances, and config files bind one service to another with failover involving an operator manually changing the config and rebooting the service.