[fideloper]

I like consul over etcd, as it implements health checks for your services, and provides DNS services.

In combination with consul-template you can pretty easily create automated service discovery which will update a configuration, such as HAProxy or nginx LB config, and reload the service.

[rickette]

Indeed, I recommend giving Consul a try if your looking into deploying a microservices architecture. I even go as far as saying that Consul provides some of the stuff an ESB is suppose to provide in a traditional SOA environment, most prominently: location transparency.