最近项目的看门狗经历了三个版本。

第一个版本:

用ps -ef，如果程序挂了就启动

第二个版本：

程序由于运行时会出现不再监听7901端口，所以不能简单判断机器是不是挂了，而是判断此端口是否有监听

第三个版本：

当7901端口不再监听，就先把原来的killall在启动，每次输出到文件的内容都加日期，要不然根本不知道这事情啥时候发生的

#!/bin/sh

set +x

source env.sh

PRMGRAM=scp_platform

FILE_NAME=scp_monitor.log

Current_Time=`date +"%Y-%m-%d %H:%M:%S.%N"`

echo "[${Current_Time}] monitor start...."

echo "[${Current_Time}] monitor start...." >> ${WORK_DIR}/log/${FILE_NAME}

port=7905

TCPListeningnum=`netstat -an | grep ":$port " | awk '$1 == "tcp" && $NF == "LISTEN" {print $0}' | wc -l`

if [ $TCPListeningnum = 1 ]

then

{

echo "[${Current_Time}] The $port is listening"

}

else

{

echo "[${Current_Time}] The port is not listening"

}

fi

while [ 1 ]

do

Current_Time=`date +"%Y-%m-%d %H:%M:%S.%N"`

TCPListeningnum=`netstat -an | grep ":$port " | awk '$1 == "tcp" && $NF == "LISTEN" {print $0}' | wc -l`

if [ $TCPListeningnum = 1 ]

then

{

echo "[${Current_Time}] The ${port} is listening" >> ${WORK_DIR}/log/${FILE_NAME}

}

else

{

echo "[${Current_Time}] The ${port} is not listening" >> ${WORK_DIR}/log/${FILE_NAME}

echo "[${Current_Time}] killall scp_platform now !" >> ${WORK_DIR}/log/${FILE_NAME}

kscp

echo "[${Current_Time}] check ${PRMGRAM} quit, now restart ${PRMGRAM} ..." >> ${WORK_DIR}/log/${FILE_NAME}

scp_platform&

}

fi

sleep 180

done

其中依赖的env.sh主要是设置环境变量和自定义的变量

#bin/bash

export ROOT=/root/scp

export WORK_DIR=${ROOT}

export INCLUDE=${ROOT}/include

export OTL=${INCLUDE}/otl_mysql

export LD_LIBRARY_PATH=${ROOT}/lib:/usr/local/lib

export ACE_ROOT=${INCLUDE}

export ODBCINI=/usr/local/etc/odbc.ini

export ODBCSYSINI=/usr/local/etc

PATH=${PATH}:${ROOT}/bin

export PATH

odbcinst -j

alias wk='cd ${ROOT}'

alias bin='cd ${ROOT}/bin'

alias cfg='cd ${ROOT}/conf'

alias rmlog='rm -rf ${ROOT}/bin/log*.*; rm -rf ${ROOT}/log/*.*'

alias lis='netstat -an|grep -i 7905'

alias scp='${ROOT}/bin/scp_platform &'

alias moni='${ROOT}/bin/monitor.sh &'

alias myps='ps -fu root|grep -v grep|grep -i scp'

alias mymoni='ps -fu root|grep -v grep|grep -i moni'

alias kscp='killall -9 scp_platform'

alias kmoni='killall -9 monitor.sh'

isql

alias mynet='netstat -an | grep 7905'

ulimit -c unlimited

ulimit -n 65530

原文：http://blog.csdn.net/calmreason/article/details/37921867