mon.sh

Linux Shell 编程

#!/bin/bash
# 是否是测试版
V_DEBUG=0
# 是否记录日志信息
F_DEBUG=0
# 监测的网络接口
interface=eth1
# 重启的时间间隔，秒计
START_INTERVAL=5
# 监测的时间间隔，秒计
INTERVAL=90
# 两次检测之间的所接收和传输的包数的最小差值
DIFFERENCE=10
# 监测和进程名
PRGNAME=/tcpwatch

while true; do
   /sbin/ifconfig > .if.tmp
   if [ ! -r .save.tmp ]; then
      last_in=0;
      last_out=0;
   else
      exec < .save.tmp
      read last_in
      read last_out
   fi

   exec < .if.tmp
   while read xx; do
      ifdevice=`echo $xx | cut -f1 -d' '`
      if [ "$interface" = "$ifdevice" ]; then
         read xx;
         read xx;
         read rxx;
         read txx;
         NowRXtmp=`echo $rxx | cut -f2 -d':'`
         NowTXtmp=`echo $txx | cut -f2 -d':'`
         NowRXpackets=`echo $NowRXtmp | cut -f1 -d' '`
         NowTXpackets=`echo $NowTXtmp | cut -f1 -d' '`
         echo $NowRXpackets > .save.tmp
         echo $NowTXpackets >> .save.tmp
         RXdifference=`expr $NowRXpackets - $last_in`
         TXdifference=`expr $NowTXpackets - $last_out`
         if [ "$V_DEBUG" -eq "1" ]; then
            echo "last in: $last_in, last_out: $last_out"
            echo "now receive:$NowRXpackets, and send:$NowTXpackets"
            echo "RX difference:$RXdifference, TX difference:$TXdifference"
         fi
#        if [ "$RXdifference" -lt "$DIFFERENCE" ] || \
         if [ "$TXdifference" -lt "$DIFFERENCE" ]; then
            /usr/bin/killall $PRGNAME
            sleep $START_INTERVAL
            $PRGNAME
         if [ "$F_DEBUG" -eq "1" ]; then
            echo "------------------Program restart----------------" >> /mon.log
	    date >> /mon.log
            echo "last in: $last_in, last_out: $last_out" >> /mon.log
            echo "now receive:$NowRXpackets, and send:$NowTXpackets" >> /mon.log
            echo "RX difference:$RXdifference, TX difference:$TXdifference" >> /mon.log
         fi
	    
         fi
      fi  
   done

   sleep $INTERVAL
done