Running cron python jobs within docker

Question

I would like to run a python cron job inside of a docker container in detached mode. My set-up is below:

My python script is test.py

#!/usr/bin/env pyt         


        

Answer 1

Don't mix crond and your base image. Prefer to use a native solution for your language (schedule or crython as said by Anton), or decouple it. By decoupling it I mean, keep things separated, so you don't have to maintain an image just to be the fusion between python and crond.

You can use Tasker, a task runner that has cron (a scheduler) support, to solve it, if you want keep things decoupled.

Here an docker-compose.yml file, that will run some tasks for you

version: "2"

services:
    tasker:
        image: strm/tasker
        volumes:
            - "/var/run/docker.sock:/var/run/docker.sock"
        environment:
            configuration: |
                logging:
                    level:
                        ROOT: WARN
                        org.springframework.web: WARN
                        sh.strm: DEBUG
                schedule:
                    - every: minute
                      task: helloFromPython
                tasks:
                    docker:
                        - name: helloFromPython
                          image: python:3-slim
                          script:
                              - python -c 'print("Hello world from python")'

Just run docker-compose up, and see it working. Here is the Tasker repo with the full documentation:

http://github.com/opsxcq/tasker