instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from your
  service's external clients to an individual swarm node, without the client
  needing to know how many nodes are participating in the service or their
  IP addresses or ports. You don't need to publish ports which are used between
  services on the same network. For instance, if you have a
  WordPress service that stores its data in a MySQL service,
  and they are connected to the same overlay network, you do not need to publish
  the MySQL port to the client, only the WordPress HTTP port.Service discovery can work in two different ways: internal connection-based
  load-balancing at Layers 3 and 4 using the embedded DNS and a virtual IP (VIP),
  or external and customized request-based load-balancing at Layer 7 using DNS
  round robin (DNSRR). You can configure this per service.By default, when you attach a service to a network and that service publishes
  one or more ports, Docker assigns the service a virtual IP (VIP), which is the
  "front end" for clients to reach the service. Docker keeps a list of all
  worker nodes in the service, and routes requests between the client and one of
  the nodes. Each request
  ```