instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from within the cluster. This is the
  default that is used if you don't explicitly specify a type for a Service.
  You can expose the Service to the public internet using an
  Ingress or a
  Gateway.NodePortExposes the Service on each Node's IP at a static port (the NodePort).
  To make the node port available, Kubernetes sets up a cluster IP address,
  the same as if you had requested a Service of type: ClusterIP.LoadBalancerExposes the Service externally using an external load balancer. Kubernetes
  does not directly offer a load balancing component; you must provide one, or
  you can integrate your Kubernetes cluster with a cloud provider.ExternalNameMaps the Service to the contents of the externalName field (for example,
  to the hostname api.foo.bar.example). The mapping configures your cluster's
  DNS server to return a CNAME record with that external hostname value.
  No proxying of any kind is set up.The type field in the Service API is designed as nested functionality - each level
  adds to the previous. However there is an exception to this nested design. You can
  define a LoadBalancer Service by
  disabling the load balancer NodePort allocation.type: ClusterIPThis default Service type assigns an IP address
  ```