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    Note: it's a fairly common recommendation to run cron jobs on the docker host instead of inside each container. I prefer not to do that, I prefer containers to be entirely self-contained and not require any special configuration on the host. IMO requiring special per-container configuration defeats a large part of the automation and ephemeral re-usability benefits provided by containerising tasks. Commented Mar 9, 2018 at 2:49
  • I have already done apt-get install cron. I'm using FROM nginx:stable... When I exec in my container and do service cron start it works perfectly. But I need the cron service to start automatically when the container is created. But it does not work Commented Mar 9, 2018 at 10:02
  • what's nginx:stable based on? where did it come from? github.com/nginxinc/docker-nginx ? (there are alpine and debian stretch based versions there). somewhere else? Commented Mar 9, 2018 at 15:21
  • It's the official stable version of nginx on docker hub, github.com/nginxinc/docker-nginx/blob/… . Commented Mar 9, 2018 at 19:19
  • OK, according to the Dockerfile, that's based on Debian stretch. It already has CMD ["nginx", "-g", "daemon off;"] and I can't recall if you can run multiple commands with CMD or not. Maybe try something like CMD ["cron;", "nginx", "-g", "daemon off;"]. If that doesn't work, create a script that runs cron and then nginx -g daemon off, COPY it to your container, RUN chmod +x path/to/your/script, and add CMD /path/to/your/script. Commented Mar 10, 2018 at 1:43