instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from your client's IP address.This example refers to the two nodes in our swarm as host1 and host2. This
  example also uses Linux hosts, but the same commands work on Windows.Walk-throughSet up the swarm.a. On host1, initialize a swarm (and if prompted, use --advertise-addr
  to specify the IP address for the interface that communicates with other
  hosts in the swarm, for instance, the private IP address on AWS):
  
  $ docker swarm init
  Swarm initialized: current node (vz1mm9am11qcmo979tlrlox42) is now a manager.
  
  To add a worker to this swarm, run the following command:
  
   docker swarm join --token SWMTKN-1-5g90q48weqrtqryq4kj6ow0e8xm9wmv9o6vgqc5j320ymybd5c-8ex8j0bc40s6hgvy5ui5gl4gy 172.31.47.252:2377
  
  To add a manager to this swarm, run 'docker swarm join-token manager' and follow the instructions.
  b. On host2, join the swarm as instructed above:
  
  $ docker swarm join --token <your_token> <your_ip_address>:2377
  This node joined a swarm as a worker.
  If the node fails to join the swarm, the docker swarm join command times
  out. To resolve, run docker swarm leave --force on host2, verify your
  network and firewall settings, and try again.On host1, create an attachable overlay network called test-net:
  
  $ docker network create --driver=overlay --attachable test-net
  uqsof8phj3ak0rq9k86zta6ht
  Notice the returned NETWORK ID -- you will see it again when you connect to it
  ```