Forked from https://github.com/miguelgrinberg/flask-celery-example

Related blog: Using Celery with Flask.

On a terminal:

docker-compose up

On another terminal:

• Create a new task

  curl -X POST http:https://localhost:5555/longtask
  # task id returned
  

• Check the task status

  curl -X GET http:https://localhost:5555/status/<task_id>
  

Experiments:

• attempt to create (almost) concurrently N tasks, N > C, where C is the Celery "concurrency" specified in docker-compose.yml. Check the status of the queued tasks.
• exec into the worker container, and check the celery processes. Verify they are equal to the specified concurrency