docker-compose.yml

# mentioned all services
services:

  # installing redis from image and its become container
  redis:
    # pulling the redis 7 image from docker hub
    image: redis:7
    # mapping the port 6379 of the container to port 6380 of the host machine
    ports:
      - "6380:6379"
    # container-name
    container_name: python_celery_tutorial_redis

  # our fast-api application code container
  api:
    # building the image from the given application-code
    build: .
    command: uvicorn app.main:app --host 0.0.0.0 --port 8000
    # mapping the port 8000 of the container to port 8000 of the host machine
    ports:
      - "8000:8000"
    # once redis is installed then only api will be built and run
    depends_on:
      redis:
        # redis service should be started before starting the api service
        condition: service_started
    # container-name
    container_name: python_celery_tutorial_api
    # environment variable
    environment:
      - REDIS_HOST=python_celery_tutorial_redis
      - REDIS_PORT=6379

  # celery worker-process container
  worker:
    # building the image from given application-code
    build: .
    command: celery -A app.celery_app worker -Q default -l info --loglevel=info -E
    # once redis is installed then only worker will be built and run
    depends_on:
      redis:
        # redis service should be started before starting the api service
        condition: service_started
    # container-name
    container_name: python_celery_tutorial_celeryworker
    # environment variable
    environment:
      - REDIS_HOST=python_celery_tutorial_redis
      - REDIS_PORT=6379

  # celery beat-worker process container
  beat:
    # building the image from given application-code
    build: .
    command: celery -A app.celery_app beat --loglevel=info
    # once redis is installed then only beat will be built and run
    depends_on:
      redis:
        # redis service should be started before starting the api service
        condition: service_started
    # container-name
    container_name: python_celery_tutorial_celerybeat
    # environment variable
    environment:
      - REDIS_HOST=python_celery_tutorial_redis
      - REDIS_PORT=6379