#注：本脚本需要以超级用户身份运行。

# 监测的时间间隔，秒计
INTERVAL=60

# 重启时间间隔
INTERVALRESTART=1

#==================================================================

PROGRAME=program
THREADNUMS=1
LOG=/apps/server/monitor.log
#SYSDATE=$(date)
  
SYSBUILD=`/bin/cat /etc/redhat-release | /bin/awk '{print $5$7}'`

var="-emf"
 
case ${SYSBUILD} in
"7.3")
        var="-e"
        ;;
"8.0")
        var="-em"
        ;;
"AS3")
        var="-emf"
        ;;
esac
  
  
while true
do
   SYSDATE=$(date)

  
   nowps1=`ps $var | grep $PROGRAME | grep -v grep | wc -l`
   nowps1=`expr $nowps1`
     
   if  [  $nowps1 -lt $THREADNUMS ]; then
        /bin/sh /apps/program.sh
        echo " " >> $LOG
        echo "*******************************************************" >> $LOG
        echo "Restart time:" $SYSDATE >> $LOG
        echo "---------- Program $PROGRAME restart ----------------" >> $LOG
        echo "*******************************************************" >> $LOG
        echo " "
   fi
sleep $INTERVAL
  
done

#-----------------------------------------------------------
exit 0

在文件/etc/rc.local在其中增加一个启动项，即在文件末尾增加一条可执行语句(如：/bin/sh /apps/program.sh)
看门狗制作完毕。

export LANG=zh_CN.GB2312

/bin/echo -e "start program!" >> /p2p.log

ps -ef|grep 'program' |grep -v grep |awk '{print $2}' |xargs -t -l kill -9

nohup /usr/java/jdk1.5.0_08/bin/java -jar /apps/program.jar 1>program.log&

启动时sh program.sh即可

二、看门狗shell脚本 monitor.sh

#!/bin/bash

#注：本脚本需要以超级用户身份运行。

# 监测的时间间隔，秒计
INTERVAL=60

# 重启时间间隔
INTERVALRESTART=1

#==================================================================

PROGRAME=program
THREADNUMS=1
LOG=/apps/monitor.log
#SYSDATE=$(date)

while true
do
   #echo " "
   #echo "**********Now begin to monitor program's status , please wait.************"
   #echo " "
   #`ulimit -c unlimited`  
   SYSDATE=$(date)
  
   nowps1=`ps -e | grep $PROGRAME | grep -v grep | wc -l`
   nowps1=`expr $nowps1`
   
   #echo "ps = $nowps1"
      
   if  [  $nowps1 -lt $THREADNUMS ]; then
  
        /usr/bin/killall -9 $PROGRAME 1>/dev/null 2>/dev/null
        echo "======================================================" >> $LOG
        echo "Restart date:" $SYSDATE >> $LOG
        echo "Program name:" $PROGRAME >> $LOG
        echo "======================================================" >> $LOG
  #sleep $INTERVALRESTART        
       # ./$PROGRAME 1>ucfile 2>ucfile
        /bin/sh /apps/server/p2pstart.sh
        echo " "
        echo "*******************************************************"
        echo "---------- Program $PROGRAME restart ----------------"
        echo "*******************************************************"
        echo " "

   fi  

   #echo "**********Now ended  monitor program's status !*************************"
   #echo " "  
  
   sleep $INTERVAL
  
done

#-----------------------------------------------------------
exit 0

如何在系统启动时启动看门狗程序：