Linux CentOS USES crontab to set the method for a timed restart

This article describes setting up the timing task for crontab and adding crontab to boot.

1. Configure a daily automatic restart function:

If crontab is supported, you can view the existing timer tasks directly from ES8en-ES9en

If the current linux does not support crontab you need to configure it:

# The installation Crontab 
yum install vixie-cron crontabs
# Set boot up Crontab 
chkconfig crond on
# Start the Crontab 
service crond start

First column 1 below the existing Crontab to see:

crontab -l

Hint: no crontab for root

Nothing, so add one:

Edit command:

crontab �e

Press i to enter edit mode and enter

30 15 * * * root /sbin/reboot

Means restart the device at 15:30 p.m. each day. Press ESC to enter command mode, type wq to save and exit.

Finally, restart crontab to make the restart function effective

service crond restart

Call it a day!

 Supplement: Crontab Basic format: 
*　 *　 *　 *　　*　　command
 Time runs   weeks   The command 
 The first 1 Columns represent minutes 1 ~ 59  Use or per minute  /1 said 
 The first 2 Columns represent hours 1 ~ 23 ( 0 said 0 Point) 
 The first 3 Columns represent dates 1 ~ 31
 The first 4 Column represents month 1 ~ 12
 The first 5 Column identification number week 0 ~ 6 ( 0 Say Sunday) 
 The first 6 Lists the commands to run 

conclusion