监控网卡故障，重启网卡：https://www.cnblogs.com/luckyall/p/8094366.html

vi check_network.sh

#!/bin/bash
date="`date '+%Y-%m-%d %H:%M:%S'`"
ip="173.208.x.x"
nic="eth0"
lost_rate=`ping -c 8 -w 8 $ip | grep 'packet loss' \
| awk -F'packet loss' '{ print $1 }' \
| awk '{ print $NF }' | sed 's/%//g'`
if [ $lost_rate -eq 0 ]
then
echo "network_ok $date $ip $nic" >>/root/network_ok.log
elif [ $lost_rate -le 100 ]
then
#echo "network_error $date $ip $nic" //输出到窗口，因为不需要所以屏蔽了
#else
echo "network_error $date $ip $nic" >>/root/network_error.log
service network restart
fi



chmod +x check_network.sh
然后在计划任务里添加
*/3 * * * * /bin/sh /opt/check_network.sh