网卡切换脚本

#!/bin/bash
# Program
# Use ping command to check the network's PC state.
PATH=/bin:/sbin:/usr/bin:/usr/sbin:/usr/local/bin:/usr/local/sbin:~/bin
export PATH
master_ip="172.16.1.154"
slave_ip="172.16.1.110"
vip="172.16.1.90"
function check_host
{
#	master_host=("172.16.1.71" )
#	network="192.168.1" # 先定义一个网域的前面部分！

# 底下的程序在取得 ping 的回传值是正确的还是失败的！
count=0
for i in $(seq 1 10)
do 
ping -c 1 -w 10 $1 &> /dev/null && result=0 || result=1
if [ "$result" == 1 ]; then #表示没有ping通
count=$[count + 1]
else
count=0
break
fi
sleep 5
done
# 开始显示结果是正确的启动 (UP) 还是错误的没有连通 (DOWN)
if [ "$count" == 0 ]; then
echo "Server virtual_ip is UP."
else
echo "Server virtual_ip is DOWN."
add_vip $vip
fi

}
function add_vip
{
ip addr add local "$1/24" brd + label eth0:1 dev eth0 #添加虚拟IP
}
function del_vip
{
ip addr del "$1/24" brd + dev eth0:1 #删除虚IP
}
function main
{
add_vip $vip
while [ 1 ]
do
check_host $vip
sleep 30
done
}
main