*/5 * * * * /xxx/xxx/monitorM2U.sh
即每5分鐘執行一下腳本/xxx/xxx/monitorM2U.sh，這個腳本的內容是：
cd /xxx/xxx/xxx/classes;
nohup “${JAVA_HOME}”/bin/java –cp ".:${CLASSPATH} " com.mdcchina.m2u.monitor.ResponseMonitor &
其中com.mdcchina.m2u.monitor.ResponseMonitor的代碼是：
/*
* Created on 2005-9-8
*
*/
package com.mdcchina.m2u.monitor;
import java.io.IOException;
import java.util.Date;
import org.apache.commons.httpclient.HttpClient;
import org.apache.commons.httpclient.methods.GetMethod;
/**
* @author Hao Wei 監控m2u進程是否能夠訪問，如果不能就重啓之
*/
public class ResponseMonitor {
public static void main(String[] args) {
if (!new ResponseMonitor()
. canRequest ("http://www.m2u.cn/albumshare/benber")) { //用來監控的地址
log("FATAL ERROR!!!!!!!!!!!!!/nM2U cannot be visit, it will be restarted!");
/**
* 在此可加入發送短信報警或記錄失敗日誌的代碼
**/
try {
String script = "/xxx/xxx/restart_tomcat.sh";
Process proc = Runtime.getRuntime().exec("/bin/sh " + script); //調用腳本進行重啓
log("execute: " + script);
log(""+proc.waitFor());
log("===========M2U process was restarted!====== ======");
} catch (IOException e) {
log("M2U cannot be restart!!!!!!!!!!!!/n" + e.getStackTrace());
}
catch( InterruptedException e1){
log("M2U cannot be restart!!!!!!!!!!!!/n" + e1.getStackTrace());
}
} else {
log("M2U OK!");
}
}
private static void log(Object obj) {
System.out.println("::::MONITOR::::|" + new Date() + "|" + obj);
}
public boolean canRequest(String url) {
boolean success = false;
HttpClient client = null;
GetMethod getMethod = null;
try {
client = new HttpClient();
log("<<<< begin send http request to " + url);
getMethod = new GetMethod(url);
client.setConnectionTimeout(40 * 1000);
client.setTimeout(40 * 1000);
client.setHttpConnectionFactoryTimeout(40 * 1000);
client.executeMethod(getMethod);
log("response code : " + getMethod.getStatusCode());
if (getMethod.getStatusCode() < 300) {
success = true;
}
} catch (IOException ex) {
log("ERROR/n" + ex.getStackTrace());
success = false;
} finally {
try {
if (getMethod != null) {
getMethod.releaseConnection();
}
} catch (Exception ex2) {
}
try {
if (client != null) {
client.endSession();
}
} catch (Exception ex1) {
}
client = null;
}
log("<<<< end send http request to " + url);
return success;
}
}
其中，這個java程序調用的重啓tomcat的腳本/xxx/xxx/restart_tomcat.sh內容如下：
/xxx/xxx/get_tomcat_pid.sh | while read PID
do
kill -9 "${PID}" &
done
su - mytt -c "cd ${CATALINA_HOME}/bin; ./startup.sh"
其中，找到tomcat主進程號的腳本/xxx/xxx/get_tomcat_pid.sh內容如下：
ps -efww|grep tomcat | while read PROCESS
do
PID2=`echo "${PROCESS}" | awk '{printf ("%s/n",$3)}'`
if [ "${PID2}" == "1" ]; then
PID1=`echo "${PROCESS}" | awk '{printf ("%s/n",$2)}'`
echo "${PID1}"
else
continue
fi
done
完鳥。