The absolute minimal celerybeat setup

celerybeat basic

Following is the absolute minimal celerybeat setup. I will use redis as the broker.

Install and run redis

on Ubuntu
sudo apt-get install redis-server

on CentOS
sudo yum install redis

Install celery and redis-py (preferably in a virtual environment)
pip install celery redis

[Note: I tried this on 3.0.23 (Chiastic Slide). You can check version with celery --version]

Have the tasks.py and celeryconfig.py files in a directory and run

celery worker -B --loglevel=info

Since I print the values in the tasks, you should see 30 (14+16) every 30 seconds and 60 (3*20) every minute.

If something is wrong, try running with --loglevel=debug and see whether there's something helpful.

celeryconfig.py

from celery.schedules import crontab
from datetime import timedelta

BROKER_URL = 'redis://localhost:6379/0'                                              
CELERY_RESULT_BACKEND = 'redis://localhost:6379/0'                                   
CELERY_IMPORTS = ('tasks',)

CELERYBEAT_SCHEDULE = {
    'every-30-secs': {
        'task': 'tasks.add',
        'schedule': timedelta(seconds=30),
        'args': (14, 16),
    },
    'every-minute': {
        'task': 'tasks.mul',
        'schedule': crontab(minute='*/1'),
        'args': (3, 20),
    },
}

tasks.py

from celery import Celery
 
celery = Celery('tasks',
        backend='redis://localhost:6379/0',
        broker='redis://localhost:6379/0')

@celery.task
def add(x, y):
    print x + y
    return x + y

@celery.task
def mul(x, y):
    print x * y
    return x * y