Introduce an example to run the docker container with the crontab.
Table of contents
Open Table of contents
Create a Python Hello World example
Create the python file main.py which contains below example.
if __name__ == '__main__':
print("Hello World!")
Create the Contab file
Create a contab file my-contab for running our code
* * * * * cd /app && python main.py
Create the docker file
FROM python:3.12-alpine
COPY . /app
WORKDIR /app
# make sure all messages always reach console
ENV PYTHONUNBUFFERED=1
RUN crontab ./my-cronjob
CMD ["/bin/sh"]
Build Dcoker image
docker build . -t cron-test
Run Docker container
docker run -d --name=my-cron-test cron-test crond -f -d 8
Check whether the cron job works by the command docker logs my-cron-test -f.
docker logs my-cron-test -f
crond: crond (busybox 1.36.1) started, log level 8
crond: USER root pid 7 cmd cd /app && python main.py
Hello World!!
crond: USER root pid 8 cmd cd /app && python main.py
Hello World!!
[Optional] Run Docker container by docker-compose
Create the docker-compose file.
services:
my-cron-test:
image: cron-test
container_name: my-cron-test
command: crond -f -d 8
Run docker container.
docker compose up -d