docker-compose.yml

# Docker compose version 3.9 : is saying use the version 3.9 syntax
version: "3.9"


services:
# NAME OF THE SERVICES app and db
  app:
    build:
      context: .
      args:
        - DEV=true
        # THIS MAP PORT 8000 FROM OUR LOCAL MACHINE TO 8000 PORT IN DOCKER
    ports:
      - "8000:8000"
      # VOLUMES ARE WAY OF MAPPING OR LINKING DIRECTORIES FROM OUR LOCAL MACHINE TO DOCKER
      # WHY WE ADDING VOLUMES IS OTHER TO SYNC THE CODE ON OUR LOCAL MACHINE TO DOCKER IN REALTIME
      # SO WE DON'T HAVE TO BUILD EVERYTIME
    volumes:
      - ./app:/app
      - dev-static-data:/vol/web
    command: >
      sh -c "python manage.py wait_for_db &&
             python manage.py migrate &&
             python manage.py runserver 0.0.0.0:8000"
    environment:
      # we are using db because it is the host name of the database db
      - DB_HOST=db
      - DB_NAME=devdb
      - DB_USER=devuser
      - DB_PASS=changeme
      - DEBUG=1
      # depends_on will wait for the db service to start before moving on
      # it would automatically create a network between the db service and app
    depends_on:
      - db

  db:
    image: postgres:13-alpine
    # stores the database which is located in docker in our local machine
    volumes:
      - dev-db-data:/var/lib/postgresql/data

    environment:
      - POSTGRES_DB=devdb
      - POSTGRES_USER=devuser
      - POSTGRES_PASSWORD=changeme

volumes:
  dev-db-data:
  dev-static-data: