title: What's the DNS name for services in different namespaces in k8s?
body: <p>In namespace A, I have a service <code>nginx</code> running. In namespace B, I can use <code>nginx.A</code> or <code>nginx.A.svc.cluster.local</code> to get access to the <code>nginx</code> in namespace A. </p>
  
  <p>So what's the difference between these two? Which one is more recommended? Why?</p>