Example docker-compose.yaml used in Medium post

Docker-compose.yaml

# This compose is for demonstration how to serve our custom image and a prebuilt image
version: "3.0"
#Services defines what containers to run
services:
    #server is the name for our custom image, this can be anything and is used by other services to refer to this.
    server:
      #the image to run the container from
      image: "learndocker:0.2"
      # set environments
      environment:
        - PORT=8080
      # bind ports to our host
      ports: 
        - 8082:8080
      # connect this container to the database container by settting them on the same virutal network
      networks:
        - amazing_network
    # Name our service database, this can be anything. The name is used to refer to this service from others, such as reaching their IP
    database:
      # Use the postgres image, this will be donwloaded for you automatically from Dockerhub
        image: "postgres"
        ports:
          # Expose and bind our ports
            - 8083:5432
        environment: 
          - POSTGRES_USER=percybolmer
          - POSTGRES_PASSWORD=topsecret
          - POSTGRES_DB=mydatabase
        #env_file:
          # Read in a file called database.env
        #    - database.env
        #volumes:
        #    - ./api/db-data:/var/lib/postgresql/data/ # persist data even if container shuts down
        networks: 
            - amazing_network
            

networks:
  # Create the network amazing_network
    amazing_network:
        driver: bridge