Linux OS uses crontab for timed shutdown to start tomcat

In the Linux operating system, use crontab to regularly shut down and start the tomcat linux operating system. to create a scheduled task, follow these steps:

After you connect to the system using an ssh tool, perform the following steps:

1) crontab-l view timing;

2) crontab-e indicates that the scheduled task can be edited, but the editing mode is not enabled yet;

3) enter I again to enter the editing mode;

4) copy the self-written timing code as follows:

0 4 ***/opt/ltim/tomcat/bin/shutdown. sh --- indicates that tomcat is disabled at 4 o'clock every day;

20 4 ***/opt/ltim/tomcat/bin/startup. sh --- indicates that tomcat is enabled at 04:10 every day;

5) press and hold the esc key to exit the editing mode;

6) save and exit and enter ": wq !";

During the scheduled task today, the following occurs: you can manually restart tomcat to execute the task, but you cannot execute it in the crontab scheduled task. the solution is to configure java_home in the. sh file.

Export JRE_HOME =/opt/ltim/j2sdk

In addition, the shell script for restarting tomcat is attached:

#! /Bin/sh

#./Etc/profile

Export JRE_HOME =/opt/ltim/j2sdk

Sh/opt/ltim/tomcat/bin/shutdown. sh

Sleep 30 s

Sh/opt/ltim/tomcat/bin/startup. sh