docker-compose.yml

# A docker-compose must always start by the version tag.
# We use '3' because it's the last version at this time.
version: '3'

# You should know that docker-composes works with services.
# 1 service = 1 container.
# For example, a service maybe, a server, a client, a database...
# We use the keyword 'services' to start to create services.
services:
  # As we said at the beginning, we want to create: a server and a client.
  # That is two services.

  # First service (container): the server.
  # Here you are free to choose the keyword.
  # It will allow you to define what the service corresponds to.
  # We use the keyword 'server' for the server.
  server:
    # The keyword "build" will allow you to define
    # the path to the Dockerfile to use to create the image
    # that will allow you to execute the service.
    # Here 'server/' corresponds to the path to the server folder
    # that contains the Dockerfile to use.
    build: server/

    # The command to execute once the image is created.
    # The following command will execute "python ./app.py".
    command: python /server/app.py

    # Remember that we defined in'server/app.py' 8000 as port.
    # If we want to access the server from our computer (outside the container),
    # we must share the content port with our computer's port.
    # To do this, the keyword 'ports' will help us.
    # Its syntax is as follows: [port we want on our machine]:[port we want to retrieve in the container]
    # In our case, we want to use port 8000 on our machine and
    # retrieve port 8000 from the container (because it is on this port that
    # we broadcast the server).
    ports:
      - 8000:8000