因為lvs nat模式下，只有入站方向的流量經過lvs服務器，出站流量直接由Real server服務器響應，所以Real Server服務器必須做相應的配置才能響應客戶數據包，即修改Real server做負載均衡時回包的源地址要改為VIP，另外要修改Real server的arp響應策略，關閉arp響應功能。

#!/bin/bash

#description:start real server

VIP=192.168.12.200

./etc/rc.d/init.d/functions

case "$1" in

start)

echo " Start LVS of Real Server "

/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up

echo "1" > /proc/sys/net/ipv4/conf/lo/arp_ignore

echo "2" > /proc/sys/net/ipv4/conf/lo/arp_announce

echo "1" > /proc/sys/net/ipv4/conf/all/arp_ignore

echo "2" > /proc/sys/net/ipv4/conf/all/arp_announce

;;

stop)

/sbin/ifconfig lo:0 down

echo "0" > /proc/sys/net/ipv4/conf/lo/arp_ignore

echo "0" > /proc/sys/net/ipv4/conf/lo/arp_announce

echo "0" > /proc/sys/net/ipv4/conf/all/arp_ignore

echo "0" > /proc/sys/net/ipv4/conf/all/arp_announce

;;

*)

echo "Usage:$0 {start|stop}"

exit 1

esac

通過service lvsrs {start|stop}開啟或關閉lvsrs

本文出自 “夜色” 博客，請務必保留此出處http://liuqun.blog.51cto.com/3544993/1983302

配置lvs nat模式下real server服務器端lvsrs腳本