Celery cron (beat) service learned things

celerybeat_howto_launch

Executing a new task periodically in celery like in java quartz, is as simple as:

0) Define your tasks in a dictionary (function check_users in background_tasks module will execute every half an hour):
beat_schedule = {
 'check_users': {
          task: 'backoffice.blueprints.users.background_tasks.check_users'
          schedule: 1800.0
 }
}

1) Launch scheduler: this scheduler WON'T execute the tasks, it will just schedule them on time.
celery -A app.celery beat -s /var/tmp/celerybeat-schedule -l DEBUG --pidfile /var/tmp/celerybeat-pid

2) Launch celery workers: this workers will take all celery tasks and run them, including the ones launched from scheduler.
celery -A app.celery worker -n worker.main@%h --max-tasks-per-child 5