When I start the cron service within the running Docker container with
service cron start
it works. But the line
RUN service cron start
within the Dockerfile seems not to have an effect. Why?
Alternatives
I thought about simply changing my CMD to something like CMD ["startup.sh"] which first runs service cron start and then run.py (a Python webserver). But I want the web server not to run as root and thus service cron start would fail.