如何解决linux网卡掉包或挂掉？

之前公司的系统由于网卡问题，经常出现掉包（掉包排除攻击的 因素）或者突然挂掉，

严重影响服务的正常提供，因此想在出现此问题时自动解决。

思路：对网卡检测掉包情况，或者用ping检测，出现了，就重启哈网卡 。瞧是很简单吧！

代码如下：

#安装帮助： mkdir  /cyc
#/cyc/renetwork.log为日志文件

#!/bin/bash
# 2013-2-17 @凹凸曼
# ping timeout  restart network
# lastmodtime 2013-3-19
pingNetwork(){
        local c=$1
        local pcount=$2
        local dst=192.168.0.143    #修改为你的交互机或者路由器ip
        if [[ ! $pcount =~ ^[0-9]+$ ]];then
                pcount=5
        fi
        loss=`ping -c $pcount  $dst|grep loss|awk '{print $6}'|cut -d% -f 1 `
        if [[ ! $loss =~ ^[0-9]+$ ]];then
                loss=100
        fi

        if [ $loss -gt 0 ]; then
                ifdown $c
                sleep 3
                ifup $c
                echo `date "+%Y%m%d %T"`": $pcount ping $loss% loss">>/cyc/renetwork.log
                sleep 30
        fi

}

#start dst eth
stopEth(){
        local c=$1
        local et=`service network status |tail -1|grep "$c"`

        if [ x"" == x"$et" ]; then
                ifup $c
                echo `date "+%Y%m%d %T"`":$c stop">>/cyc/renetwork.log
                sleep 30
        fi
}
#drop found
NetDrop(){
        local c=$1
        #$6 RX-DRP
        local redp=`netstat -i|grep "$c"|awk 'END{print $6}'`
        #$10 TX-DRP
        local txdp=`netstat -i|grep "$c"|awk 'END{print $10}'`

        if [ $redp -gt 0 ];then
                ifdown $c
                sleep 3
                ifup $c
                echo `date "+%Y%m%d %T"`":$c RX-DRP drop">>/cyc/renetwork.log
                sleep 30
        fi

        sleep 2
    if [ $txdp -gt 0 ];then
                ifdown $c
                sleep 3
                ifup $c
                echo `date "+%Y%m%d %T"`":$c TX-DRP drop">>/cyc/renetwork.log
                sleep 30
        fi

}

wtime=$2
eth=$1
if [[ ! $wtime =~ ^[0-9]+$ ]];then
  wtime=3
fi
if [ x"" == x"$eth" ];then
        echo "please enter the NIC name!"
        exit
fi
while [ 1 ]
        do

        stopEth $eth
        sleep $wtime
        NetDrop $eth
        sleep $wtime
        pingNetwork $eth 1

done

程序运行至目前的日志结果如下：

20130319 12:23:01: eth0 1 ping 100% loss
20130319 13:43:50: eth0 1 ping 100% loss
20130319 18:11:18: eth0 1 ping 100% loss
20130323 08:04:59: eth0 1 ping 100% loss
20130323 14:41:04: eth0 1 ping 100% loss
20130324 12:49:04: eth0 1 ping 100% loss
20130327 13:15:47: eth0 1 ping 100% loss
20130401 11:17:42: eth0 1 ping 100% loss
20130402 09:02:14: eth0 1 ping 100% loss
20130403 08:49:30: eth0 1 ping 100% loss
20130404 20:21:46: eth0 1 ping 100% loss
20130407 18:44:57: eth0 1 ping 100% loss
20130408 10:46:53: eth0 1 ping 100% loss
20130408 14:41:06: eth0 1 ping 100% loss
20130408 14:47:24: eth0 1 ping 100% loss
20130408 15:23:02:eth0 RX-DRP drop
20130415 08:30:09: eth0 1 ping 100% loss
20130415 11:16:16: eth0 1 ping 100% loss
20130417 08:05:41: eth0 1 ping 100% loss
20130419 08:04:19: eth0 1 ping 100% loss
20130419 10:40:51: eth0 1 ping 100% loss
20130419 11:33:14: eth0 1 ping 100% loss
20130419 19:03:03: eth0 1 ping 100% loss
20130421 16:10:55: eth0 1 ping 100% loss
20130422 07:47:34: eth0 1 ping 100% loss
20130423 07:15:07: eth0 1 ping 100% loss

呵呵，自动解决了网卡掉包或挂掉的烦恼！您是不是很爽！
忘记了说鸟，此程序运行环境Red Hat Enterprise Linux Server release 5.4或者Centos6.3
其他linux环境估计问题不大，这里就不测试鸟！

本文出自 “凹凸曼” 博客，请务必保留此出处  http://www.apoyl.com/?p=1496