2018/03/09

March 09 2018 Friday

Weather:suny
一、需求：

• 每10分鐘檢測一次指定網卡的流量
• 若是流量爲0，則重啓網卡

[root@Dasoncheng sbin]# cat r.sh 
#!/bin/bash
##to test the network card liuliang
if [ -n "$1" ];
then
    if `sar -n DEV 1 2 | tail -3 | grep -q "$1"`;
    then 
        ab=`sar -n DEV 1 2 |tail -3 |grep eth0 |awk '{print $5,$6}'`
        a=`echo $ab |awk '{print $1}'`
        b=`echo $ab |awk '{print $2}'`
        if [ "$a" == "0.00" ] && [ "$b" == "0.00" ];
        then
            ifdown $1
            ifup $1
        else
            exit
        fi
    else
        echo "Please input a vaild network card!"
    fi
else
    echo "Sorry you need to input the name of network card!"
fi

answer referred

#!/bin/bash
LANG=en
n1=`sar -n DEV 1 60 |grep eth0 |grep -i average|awk '{print $5}'|sed 's/\.//g'`
n2=`sar -n DEV 1 60 |grep eth0 |grep -i average|awk '{print $6}'|sed 's/\.//g'`
if [ $n1 == "000" ] && [ $n2 == "000" ]
then
    ifdown eth0
    ifup eth0
fi
##而後寫個cron，10分鐘執行一次