Configuring the RS

Procedure

Perform the following steps on each RS.

1. Modify kernel parameters to disable the RS from responding to ARP broadcast.

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

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

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

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

2. Configure the virtual IP address, for example, 192.168.1.2 for the RS.

   1	ifconfig lo:0 192.168.1.100 netmask 255.255.255.255 broadcast 192.168.1.100 up

   1	route add -host 192.168.1.100 dev lo:0

Configuration Script Example

A script can be configured and executed in any directory on the server to perform the preceding two steps. The following is an example of the script:

#!/bin/bash
#description:Set vip of Real Server
if [ $# -eq 0 ];then
        echo "usage: $0 start/stop"
        exit 1
fi
viplist=('192.168.1.100')
mask=255.255.255.255
case $1 in
start)
	echo 1 > /proc/sys/net/ipv4/conf/all/arp_ignore
	echo 1 > /proc/sys/net/ipv4/conf/lo/arp_ignore
	echo 2 > /proc/sys/net/ipv4/conf/all/arp_announce
	echo 2 > /proc/sys/net/ipv4/conf/lo/arp_announce
	for vip in ${viplist[@]}
        do
		ifconfig lo:0 $vip netmask $mask  broadcast $vip up
	route add -host $vip dev lo:0
        done
;;
stop)
	echo 0 > /proc/sys/net/ipv4/conf/all/arp_ignore
	echo 0 > /proc/sys/net/ipv4/conf/lo/arp_ignore
	echo 0 > /proc/sys/net/ipv4/conf/all/arp_announce
	echo 0 > /proc/sys/net/ipv4/conf/lo/arp_announce

        for vip in ${viplist[@]}
        do
		route del -host $vip dev lo:0
		ifconfig lo:0  down
        done

;;
esac