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I created a docker image to run crontab based on the official nginx image.

FROM nginx

RUN apt-get update && apt-get -y install cron

CMD ["cron", "-f"]

If I don't set the last line CMD ["cron", "-f"], the crontab service can't start after running it as a container. But if I set it, nginx can't start.

docker build -t some-content-nginx .
docker run --name some-nginx -d -p 8080:80 some-content-nginx
(Nginx isn't running)

How to start these 2 services together?

Mostafijur Rahman
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iooi
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    You only run one process per container, and so you'd run a separate cron container (for example, [How to run a cron job inside a docker container?](https://stackoverflow.com/questions/37458287/how-to-run-a-cron-job-inside-a-docker-container)). Is there a specific reason you're trying to run them in the same container? – David Maze Dec 23 '20 at 13:08
  • Because I want to use `crontab` to monitor logrotate for nginx logs in one container. In other container it can't get nginx's pid. – iooi Dec 24 '20 at 00:54
  • You might consider the default `nginx` image setting that writes logs to the `docker logs` output, or bind-mounting a host directory over `/var/log/nginx`. Either of those would let you use a host-based log-management solution that doesn't need special support inside the container. – David Maze Dec 24 '20 at 01:19
  • This way can do it well: https://docs.docker.com/config/containers/multi-service_container/ – iooi Dec 24 '20 at 02:07

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