ubuntu配置定时重启

vi /etc/crontab
add
1 18 * * * root /sbin/reboot

root@vm239962:~# cat /etc/cr
cracklib/     cron.d/       cron.daily/   cron.hourly/  cron.monthly/ crontab       cron.weekly/  
root@vm239962:~# cat /etc/crontab
# /etc/crontab: system-wide crontab
# Unlike any other crontab you don't have to run the `crontab'
# command to install the new version when you edit this file
# and files in /etc/cron.d. These files also have username fields,
# that none of the other crontabs do.

SHELL=/bin/sh
PATH=/usr/local/sbin:/usr/local/bin:/sbin:/bin:/usr/sbin:/usr/bin

# m h dom mon dow user	command
17 *	* * *	root    cd / && run-parts --report /etc/cron.hourly
25 6	* * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.daily )
47 6	* * 7	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.weekly )
52 6	1 * *	root	test -x /usr/sbin/anacron || ( cd / && run-parts --report /etc/cron.monthly )
1 0	* * *	root	/sbin/reboot
1 6	* * *	root	/sbin/reboot
1 12	* * *	root	/sbin/reboot
1 18	* * *	root	/sbin/reboot
#
root@vm239962:~# 

https://www.devler.cn/blog/59