[Solved] You defined this schedule in your Django settings: beat_schedule = { 'cleanup-task': { 'task': 'app.tasks.cleanup', 'schedule':... What is the most likely cause? | Django

Django - Celery and Background Tasks

You defined this schedule in your Django settings:

beat_schedule = {
  'cleanup-task': {
    'task': 'app.tasks.cleanup',
    'schedule': crontab(minute=0, hour='*')
  }
}

But the task never runs. What is the most likely cause?

AThe task name 'cleanup-task' is invalid

BYou forgot to start the Celery Beat service

CThe crontab syntax is incorrect because minute should be a string

DThe worker must be restarted every hour

Step-by-Step Solution

Solution:

Step 1: Check if Celery Beat is running
Celery Beat must be running to send scheduled tasks to the worker.
Step 2: Validate other options
Task names can be any string, crontab accepts integer or string for minute, and workers do not need hourly restart.
Final Answer:
You forgot to start the Celery Beat service -> Option B
Quick Check:
Beat service must run for schedules to trigger [OK]

Quick Trick: Always run Celery Beat alongside worker [OK]

Common Mistakes:

MISTAKES

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You defined this schedule in your Django settings: