如何在 docker ubuntu 基础上启动 cron？

Question

I have installed cron via apt-get install cron

Trying to start cron fails (as expected) because of upstart not running.

What is the command line for starting cron properly (ie it will read users' crontabs, will read /etc/crontab/* etc)?

Please note that I do not want to start the container as a "full" machine, so I don't want to run /sbin/init or upstart . I manage the processes via supervisord , so what I 'm missing is the command line to add to its configuration file.

Answer 1

You can run cron without daemon mode.

root@xxxxxx:~# cron -f

---

I was just trying to test it:

• I started /bin/bash in a new container
• apt-get install cron nano screen
• getty tty -a root
• screen , in screen I created 2 terminals:
• first: cron -f
• second: crontab -e - edit your crontab, save and you can watch that the cron is working ...

Answer 2

我只是使用普通的cron命令启动cron，它将作为守护程序启动它，而后来我使用tail -f <my logfile>阻止启动脚本的过程。

Answer 3

I use Matomo official container for my analytics for my websites. Most the time with Ubuntu containers I just install cron the most basic way.

apt update
apt install nano cron -y

And then just run crontab -e and add my cron.

For Matomo it would not work. Then the light bulb moment hit me. Once I ran

dpkg-reconfigure tzdata

the cron started working.

If you have install cron and it's not working. Try running dpkg-reconfigure tzdata it may solve the problem.