crontab-script.md

Crontab script for servers to auto shutdown and reboot at given time

This is the working cronjob where it is configured to shutdown at minute:00 hour:22 (i.e 10pm) *this is also the time when this script runs and then counts down to the given seconds.convert hours to seconds with: 60x60xh where h is how many hours till the system restarts to. There is a process where we can use time but its not compatable with every systems, which is why im using seconds

use this to check if the clock is synced to the time you are in or your server will not shutdown or restart on given time.

timedatectl

check timezone if necessary

timedatectl | grep Time

change timezone if necessary

timedatectl list-timezones

After listing the timezones find your time zone and place it in the blow command

timedatectl set-timezone "Asia/Kathmandu"

Find the rtcwake with which rtcwake and change the vlaue below if different. In most case its same.

00 22 * * * root /usr/sbin/rtcwake -u -m off -s 46800

Test your RTCwake is working or not with

rtcwake -u -m off -s 60

With this command your server will shutdown and wait for 1 minute to check if its worked or not.