配置lvs nat模式下real server服务器端lvsrs脚本

因为lvs nat模式下，只有入站方向的流量经过lvs服务器，出站流量直接由Real server服务器响应，所以Real Server服务器必须做相应的配置才能响应客户数据包，即修改Real server做负载均衡时回包的源地址要改为VIP，另外要修改Real server的arp响应策略，关闭arp响应功能。

#!/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

通过service lvsrs {start|stop}开启或关闭lvsrs