instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  From within a Pod:for ep in 10.244.0.5:9376 10.244.0.6:9376 10.244.0.7:9376; do
   wget -qO- $ep
  done
  This should produce something like:hostnames-632524106-bbpiw
  hostnames-632524106-ly40y
  hostnames-632524106-tlaok
  You expect each Pod in the endpoints list to return its own hostname. If
  this is not what happens (or whatever the correct behavior is for your own
  Pods), you should investigate what's happening there.Is the kube-proxy working?If you get here, your Service is running, has EndpointSlices, and your Pods
  are actually serving. At this point, the whole Service proxy mechanism is
  suspect. Let's confirm it, piece by piece.The default implementation of Services, and the one used on most clusters, is
  kube-proxy. This is a program that runs on every node and configures one of a
  small set of mechanisms for providing the Service abstraction. If your
  cluster does not use kube-proxy, the following sections will not apply, and you
  will have to investigate whatever implementation of Services you are using.Is kube-proxy running?Confirm that kube-proxy is running on your Nodes. Running directly on a
  Node, you should get something like the below:ps auxw | grep kube-proxy
  root 4194 0.4 0.1 101864 17696 ? Sl Jul04 25:43 /usr/local/bin/kube-proxy --master=https://kubernetes-master --kubeconfig=/var/lib/kube-proxy/kubeconfig --v=2
  Next, confirm that it is not failing something obvious, like contacting the
  master. To do this, you'll have to look at the logs. Accessing the logs
  depends on your Node OS. On some OSes it is a file, such as
  /var/log/kube-proxy.log, while other OSes use journalctl to access logs. You
  should see something like:I1027 22:14:53.995134 5063 server.go:200] Running in resource-only container "/kube-proxy"
  I1027 22:14:53.998163 5063 server.go:247] Using iptables Proxier.
  I1027 22:14:54.038140 5063 proxier.go:352] Setting endpoints for "kube-system/kube-dns:dns-tcp" to [10.244.1.3:53]
  I1027 22:14:54.038164 5063 proxier.go:352] Setting endpoints for "kube-system/kube-dns:dns" to [10.244.1.3:53]
  I1027 22:14:54.038209 5063 proxier.go:352] Setting endpoints for "default/kubernetes:https" to [10.240.0.2:443]
  I1027 22:14:54.038238 5063 proxier.go:429] Not syncing iptables until Services and Endpoints have been received
  ```