Linux timed Task settings

When setting up timed tasks, you need to pay attention to a lot of details, such as permissions, paths, output logs, and so on, here in CentOS for example, give an example of successful implementation, but the actual set of methods, this article is only as a reference.

Log on to the server is your own user name, in the/opt/directory to create a new folder, and then the jar package, dependencies and log directory new, give permissions:

777 *

Then write the script, the script content is set to execute the key jar package, and output the log, it should be noted that the jar package path and the log path must be absolute path, otherwise in the scheduled task can not be executed:

#!/bin/bash/opt/jdk1. 7. 0_67/bin/java-jar/opt/chiq3huanjson/sendmsghuanjson-0.0. 1-snapshot.jar >>/opt/chiq3huanjson/logs/sendmsghuanjson.log

As you can see, the JDK is an absolute path, because the environment for the Jar package compilation is jdk1.7, and the server's default environment is jdk1.6, so you need to specify the path to the JDK. Once the script is written, the same 777 permissions are given. At this point the test script, if able to execute successfully, we can set the scheduled task:

sudo crontab-e

After entering the set run the script we just wrote:

 the  * * * * sh/opt/chiq3huanjson/go.sh

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About Time setting rules:

Basic format:
* * * * * command
Time-sharing Weekly command

The 1th column represents minutes 1~59 per minute with * or */1
The 2nd column represents the hour 1~23 (0 means 0 points)
The 3rd column represents the date 1~31
The 4th column represents the month 1~12
5th Column Identification Number Week 0~6 (0 = Sunday)
6th List of commands to run

Some examples of crontab files:

* * * * */usr/local/etc/rc.d/lighttpd restart
The above example shows that 21:30 restarts Apache per night.

4 1,10,22 * */USR/LOCAL/ETC/RC.D/LIGHTTPD restart
The above example shows that 4:45 restarts Apache on the 1, 10, and 22nd of the month.

1 * * 6,0/USR/LOCAL/ETC/RC.D/LIGHTTPD restart
The above example shows that 1:10 restarts Apache every Saturday and Sunday.

0,30 18-23 * * */usr/local/etc/rc.d/lighttpd restart
The above example shows that Apache restarts every 30 minutes from 18:00 to 23:00 every day.

0 * * 6/USR/LOCAL/ETC/RC.D/LIGHTTPD restart
The above example shows the restart of Apache every Saturday at 11:00am.

* */1 * * * */usr/local/etc/rc.d/lighttpd restart
Restart Apache every hour

* 23-7/1 * * * */usr/local/etc/rc.d/lighttpd restart
From 11 o'clock to 7 in the morning, restart Apache every hour.

0 4 * mon-wed/usr/local/etc/rc.d/lighttpd restart
4th per month with 11-point restart from Monday to Wednesday Apache

0 4 1 Jan */usr/local/etc/rc.d/lighttpd restart4-point restart of Apache on January 1

　　

Linux timed Task settings