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linux设置每天自动关机crontab,【树莓派】crontab设置Linux设备定时重启

crontab shutdown

简介:设置Linux设备定时重启或者关机

问题:有台设备每天总需要使用的人手动重启一下才可以正常工作,但是检查了日志,看起来服务一切都正常。时间和正确时间相差4mins。

解决办法:

1.增加定时任务,设置自动重启;

2.修改正确时间,并增加自动同步;

都是相对比较简单的命令,这里简单记录一下,可以供需要的同学参考;

增加定时任务,设置自动重启:

编辑crontab

sudo crontab -e

增加定时重启命令,查看crontab

lifeccp@raspberrypi:~ $ sudo crontab -l

# Edit this file to introduce tasks to be run by cron.

#

# Each task to run has to be defined through a single line

# indicating with different fields when the task will be run

# and what command to run for the task

#

# To define the time you can provide concrete values for

# minute (m), hour (h), day of month (dom), month (mon),

# and day of week (dow) or use '*' in these fields (for 'any').#

# Notice that tasks will be started based on the cron's system

# daemon's notion of time and timezones.

#

# Output of the crontab jobs (including errors) is sent through

# email to the user the crontab file belongs to (unless redirected).

#

# For example, you can run a backup of all your user accounts

# at 5 a.m every week with:

# 0 5 * * 1 tar -zcf /var/backups/home.tgz /home/

#

# For more information see the manual pages of crontab(5) and cron(8)

#

# m h dom mon dow command

0 10 * * * sudo -u root reboot

重启服务确保生效:

sudo service cron restart

sudo vi /etc/sudoers

其他:

需要root权限才能执行的crontab,比如shutdown关机 需要: sudo crontab -e

在编辑器中加入下面2行,先将时间记录到日志中,每天22点30分钟 执行关机命令,1分钟警告后会自动关机

30 22 * * * date >> /home/haochuang/temp/shutdown.log

30 22 * * * sudo -u root shutdown -h 1

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