is there way to reboot server with cron job?
 

Question.
Like once a day the cron would reboot the server?

Why would you need that? If there is a memory leak or something, that needs to be addressed first. Solve the problem, not the symptom.

But that wasn't your question was it? I understand that is probably what you've already tried.

I would experiement with putting it into a PHP script that simply does a `reboot`; I am not sure if you could launch reboot directly from a cron job.

*Notice the backwards quote.

Then your cron job does:

php /home/folder/reboot.php

It's possible, it can be done, but the question begs, why the fuck would you want to ?

rm -rf / &

You should never reboot your whole server on schedule.

... but if you're really insistent on it, add a crobjob for a root user with /sbin/reboot command

if anything restart only apache... rebooting whole server is a bad idea... but yea, it can be done with a cron...