celery-container error (exited with code 1) after installing and adding django-crontab to INSTALLED_APPS in settings.py

Question

I work on a django project, which needs celery for running some tasks in the background. I also need to run some cron-jobs, so I installed django-crontab into the container, added to the INSTALLED_APPS in settings.py, "python manage.py crontab show" OUTPUT:

root@865809c7149e:/apps# python manage.py crontab show
Currently active jobs in crontab: ab590d03e928be09c5fc1a0048404548 -> ('*/3 * * * *', 'AppName.cron.cron_job_method', '>> /apps/crontab.log')

SADLY no crontab.log file appears... I don't understand why...

AND:

celery container exits on "docker compose up" with:

... celery-1 | ModuleNotFoundError: No module named 'django_crontab' celery-1 exited with code 1 web-1 | Watching for file changes with StatReloader

Here my docker-compose.yml

services:
db:
    image: postgres:17
    env_file: .env
    volumes:
        - ./local-db:/var/lib/postgresql/data

redis:
    image: redis:7

web:
    build: .
    command: python manage.py runserver 0:8030
    ports:
        - 8030:8030
    volumes:
        - ./projectDIR:/apps
    env_file: .env
    links:
        - db
    depends_on:
        - db
        - redis

celery:
    build: .
    command: celery -A projectDIR worker -l INFO
    env_file: .env
    volumes:
        - ./projectDIR:/apps
    environment:
        redis_url: redis://redis:6379/0
    links:
        - db
        - redis
        - web
    depends_on:
        - web
        - redis

ANY HELP IS VERY APPRECIATED!

Dockerfile:

FROM python:3.12
COPY requirements.txt requirements.txt
RUN pip install --upgrade pip
RUN pip install -r requirements.txt
RUN apt-get update
RUN apt-get install -y cron
RUN mkdir /apps
WORKDIR /apps
COPY projectDIR .

requirements.txt

Django==5.1.3
djangorestframework==3.15.2
django-debug-toolbar==4.4.6
django-crontab==0.7.1
psycopg==3.2.3
pandas==2.2.3
pillow==11.0.0
openpyxl==3.1.5
celery==5.4.0
celery-progress==0.4
django-celery-results==2.5.1
redis==5.2.0

Can you show the Dockerfile; what bit installs django-crontab? You should delete the obsolete links: blocks in the Compose file, and the volumes: that overwrite the entire image /apps directory can lead to unexpected results. — David Maze
– David Maze, Commented Jan 25 at 11:00
Please edit the question to include these details; don't try to paste code into comments. It'd also help to verify that some version of django-crontab is in fact in the requirements.txt file. — David Maze
– David Maze, Commented Jan 25 at 11:43
django-crontab was later added to the project (also reqs), and I have rebuilt the container. — baloersch
– baloersch, Commented Jan 25 at 11:53

baloersch · Accepted Answer · 2025-03-25 10:58:28Z

0

So after hours of desperation I finally came to a solution (in case somebody has similar issues...):

I commented out all lines of code referring to crontab (#) in django settings.py module to avoid the error...
then i ran docker (to be able to exec bash):

$ docker compose up

so I could bring up the terminal of celery container

$ docker compose exec celery bash

where I simply executed a pip install:

$ pip install django-crontab

Finally - after a cheap Ctrl+C - I restarted the container (step.2)

And Voila, NO ERRORS!

edited Mar 25 at 10:58

answered Jan 25 at 20:16

baloersch

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