instruction: Create a comprehensive Dockerfile for networking applications with best practices
output: ```dockerfile
  from other running containers using labels. Traefik will watch engine events (for container starts and stops), extract the labels, and update its configuration.While there are many Traefik-monitored labels, the two most common will be:traefik.http.routers.<service-name>.rule - used to indicate the routing rule (view all of the available rules here)traefik.http.services.<service-name>.loadbalancer.server.port - indicates the port Traefik should forward the request to. Note that this container port does not need to be exposed on your host machine (read about port detection here)Letâs do a quick demo of starting Traefik and then configuring two additional containers to be accessible using different hostnames.In order for two containers to be able to communicate with each other, they need to be on the same network. Create a network named traefik-demo using the docker network create command:
  
  $ docker network create traefik-demo
  Start a Traefik container using the following command. The command exposes Traefik on port 80, mounts the Docker socket (which is used to monitor containers to update configuration), and passes the --providers.docker argument to configure Traefik to use the Docker provider.
  
  $ docker run -d --network=traefik-demo -p 80:80 -v /var/run/docker.sock:/var/run/docker.sock traefik:v3.1.2 --providers.docker
  Now, start a simple Nginx container and define the labels Traefik is watching for to configure the HTTP routing. Note that the Nginx container is not exposing any ports.
  
  $ docker run -d --network=traefik-demo --label 'traefik.http.routers.nginx.rule=Host(`nginx.localhost`)' nginx
  Once the container starts, open your browser to http://nginx.localhost to see the app (all Chromium-based browsers route *.localhost requests locally with no additional setup).Start a second application that will use a different hostname.
  
  $ docker run -d --network=traefik-demo --label 'traefik.http.routers.welcome.rule=Host(`welcome.localhost`)' docker/welcome-to-docker
  Once the container starts, open your browser to http://welcome.localhost. You should see a âWelcome to Dockerâ website.Using Traefik in developmentNow that youâve experienced Traefik, itâs time to try using it in a development environment. In this example, you will use a sample application that has a split frontend and backend. This app stack has the following configuration:All requests to /api to go to the API serviceAll other requests to localhost go to the frontend clientSince the app uses MySQL, db.localhost should provide phpMyAdmin to make it easy to access the database during development
  The application can be accessed on GitHub at dockersamples/easy-http-routing-with-traefik.In the compose.yaml file, Traefik is using the following configuration:
  
  services:
   proxy:
   image: traefik:v3.1.2
   command: --providers.docker
   ports:
   - 80:80
   volumes:
   - /var/run/docker.sock:/var/run/docker.sockNote that this is essentially the same configuration as used earlier, but now in a Compose syntax.The client service has the following configuration, which will start the container and provide it with the labels to receive requests at localhost.
  
  services:
   # â¦
   client:
   image: nginx:alpine
   volumes:
   - "./client:/usr/share/nginx/html"
   labels:
   traefik.http.routers.client.rule: "Host(`localhost`)"The api service has a similar configuration, but youâll notice the routing rule has two conditions - the host must be âlocalhostâ and the URL path must have a prefix of â/apiâ. Since this rule is more specific, Traefik will evaluate it first compared to the client rule.
  
  services:
   # â¦
   api:
   build: ./dev/api
   volumes:
   - "./api:/var/www/html/api"
   labels:
   traefik.http.routers.api.rule: "Host(`localhost`) && PathPrefix(`/api`)"And finally, the phpmyadmin service is configured to receive requests for the hostname âdb.localhostâ. The service also has environment variables defined to automatically log in, making it a little easier to get into the app.
  
  services:
   # â¦
   phpmyadmin:
   image: phpmyadmin:5.2.1
   labels:
   traefik.http.routers.db.rule: "Host(`db.localhost`)"
   environment:
   PMA_USER: root
   PMA_PASSWORD: passwordBefore starting the stack, stop the Nginx container if it is still running.And thatâs it. Now, you only need to spin up the Compose stack with a docker compose up and all of the services and applications will be ready for development.Sending traffic to non-containerized workloadsIn some situations, you may want to forward requests to applications not running in containers. In the following architecture diagram, the same application
  ```