title: Eureka Server: How to achieve high availability
body: <p>I'm new to spring cloud. I've read <a href="http://cloud.spring.io/spring-cloud-static/spring-cloud.html#_service_discovery_eureka_clients" rel="noreferrer">this doc</a> and it says the client application must specify a service url:</p>
  
  <pre><code>eureka:
    client:
      serviceUrl:
        defaultZone: http://localhost:8761/eureka/
  </code></pre>
  
  <p>But what if <code>localhost:8761</code> goes down?</p>