#!/bin/sh
LANG=C
date=$(date -d "today" +"%Y-%m-%d %H:%M:%S")

function_bind_vip1()
{
    /sbin/ifconfig eth0:ha1 61.1.1.3 broadcast 219.232.254.255 netmask
255.255.255.192 up
    /sbin/route add -host 61.1.1.3 dev eth0:ha1
}

function_bind_vip2()
{
    /sbin/ifconfig eth0:ha2 61.1.1.2 broadcast 219.232.254.255 netmask
255.255.255.192 up
    /sbin/route add -host 61.1.1.2 dev eth0:ha2
}

function_restart_nginx()
{
    kill -USR1 `cat /usr/local/webserver/nginx/nginx.pid`
}

function_remove_vip1()
{
    /sbin/ifconfig eth0:ha1 61.1.1.3 broadcast 219.232.254.255 netmask
255.255.255.192 down
}

function_remove_vip2()
{
    /sbin/ifconfig eth0:ha2 61.1.1.2 broadcast 219.232.254.255 netmask
255.255.255.192 down
}

function_vip_arping1()
{
    /sbin/arping -I eth0 -c 3 -s 61.1.1.3 61.1.1.1 > /dev/null 2>&1
}

function_vip_arping2()
{
    /sbin/arping -I eth0 -c 3 -s 61.1.1.2 61.1.1.1 > /dev/null 2>&1    
}

bind_time_vip1="N";    
bind_time_vip2="N";

while true
do
    httpcode_rip1=`/usr/bin/curl -o /dev/null -s -w %{http_code}
http://61.1.1.5`
    httpcode_rip2=`/usr/bin/curl -o /dev/null -s -w %{http_code}
http://61.1.1.4`
    
    if [ x$httpcode_rip1 == "x200" ];
    then
        if [ $bind_time_vip1 == "N" ];
        then
            function_bind_vip1
            function_vip_arping1
            function_restart_nginx
            bind_time_vip1="Y"
        fi
        function_vip_arping1
    else
        if [ $bind_time_vip1 == "Y" ];
        then    
            function_remove_vip1
            bind_time_vip1="N"
        fi
    fi
    
    if [ x$httpcode_rip2 == "x200" ];
    then
        if [ $bind_time_vip2 == "Y" ];
        then    
            function_remove_vip2
            bind_time_vip2="N"
        fi
    else
        if [ $bind_time_vip2 == "N" ];
        then    
            function_bind_vip2
            function_vip_arping2
            function_restart_nginx
            bind_time_vip2="Y"            
        fi
        function_vip_arping2
    fi

    sleep 5
done