instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from the set.
  SRV records
  SRV Records are created for named ports that are part of normal or headless
  services. For each named port, the SRV record has the form
  _port-name._port-protocol.my-svc.my-namespace.svc.cluster-domain.example.
  For a regular Service, this resolves to the port number and the domain name:
  my-svc.my-namespace.svc.cluster-domain.example.
  For a headless Service, this resolves to multiple answers, one for each Pod
  that is backing the Service, and contains the port number and the domain name of the Pod
  of the form hostname.my-svc.my-namespace.svc.cluster-domain.example.
  Pods
  A/AAAA records
  Kube-DNS versions, prior to the implementation of the DNS specification, had the following DNS resolution:
  pod-ipv4-address.my-namespace.pod.cluster-domain.example.
  For example, if a Pod in the default namespace has the IP address 172.17.0.3,
  and the domain name for your cluster is cluster.local, then the Pod has a DNS name:
  172-17-0-3.default.pod.cluster.local.
  Any Pods exposed by a Service have the following DNS resolution available:
  pod-ipv4-address.service-name.my-namespace.svc.cluster-domain.example.
  Pod's hostname and subdomain fields
  Currently when a Pod is created, its hostname (as observed
  ```