Celery beat running tasks every minute even thought It's set for every two hours - celery

Question

I'm trying to use celery beat to run tasks daily at a specific time.
However for testing purposes, I'm setting up two tasks to run every two hours, this is what my config looks like:
CELERYBEAT_SCHEDULE = {
'daily-google-connect': {
'task': 'app.engine.schedule_fetcher',
'schedule': crontab(hour='*/2'),
'args': (['G'])
},
'daily-facebook-connect': {
'task': 'app.engine.schedule_fetcher',
'schedule': crontab(hour='*/2'),
'args': (['F'])
}
}
This is how I run celery:
celery beat -A app.engine.celery --schedule=/tmp/celerybeat-schedule --pidfile=/tmp/celerybeat.pid -l info
Everything runs in Docker containers using docker-compose so I make sure that I re-build the app's image and restart the containers.
I even enter into the running container and I see the crontab setup in the code... however in my logs, I see the task running every minute.
What else can I do to debug this?
I appreciate any help,
Thanks

Answer 1

Your crontab is configured to run „At every minute past every 2nd hour“.
from celery.schedules import crontab
str(crontab(hour='*/2'))
'<crontab: * */2 * * * (m/h/d/dM/MY)>'
Ref: https://crontab.guru/#*_*/2_*_*_*
Correct crontab for „Every two hours“ is: 0 */2 * * *.
Ref: https://crontab.guru/every-2-hours
This should fix your issue:
CELERYBEAT_SCHEDULE = {
'daily-google-connect': {
'task': 'app.engine.schedule_fetcher',
'schedule': crontab(minute='0', hour='*/2'),
'args': (['G'])
},
'daily-facebook-connect': {
'task': 'app.engine.schedule_fetcher',
'schedule': crontab(minute='0', hour='*/2'),
'args': (['F'])
}
}