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I have a mail server in my environment and I never touched it (someone configured it for me at first) since a few days ago when everything stopped working and I was unable to receive any emails. The error was "Kernel Panic" and I had to reboot the server. Someone looked at it and decided that the high uptime caused this. I want to implement a scheduled task to restart the server every 6 months on a Saturday at midnight. Is this possible? Thanks

Dominique
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You can configure a cron job for this task. 

00 12 01 */6 * bash -c "reboot"

Will reboot the computer every 6 months at 12:00

ap0
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  • And if I use 24h format I need to run it like this? 00 00 01 /6 bash -c "reboot" ? – Dominique May 19 '16 at 20:03
  • The second value is given in hours - values 0 to 23 are valid. maybe this cheat sheet will help you understand http://www.pc-freak.net/images/crontab-execute-cron-jobs-every-second-on-linux-cron-logo.png – ap0 May 19 '16 at 20:04
  • Thanks. I'll try to set it up and see. Is there any way to test if it works? Like trigger it somehow? – Dominique May 19 '16 at 20:07
  • Set it to reboot every 10 minutes. This will give you a short time to wait for testing but enough to remove the crontab entry again. Also see murus comment on your question. – ap0 May 19 '16 at 20:08
  • Alright, cheers. I'll try. One more question: */6 this part means that every year in June and December the server will reboot, right? What if I want to reboot it in 6 months starting today? does that work like that (e.g. from when you set it up? or does it calculate the months of the year as I said above?) – Dominique May 19 '16 at 20:15