LVS DR模式配置

一、试验拓扑

二、环境描述

负载均衡器：eth0 192.168.152.139

VIP：192.168.152.250

web节点IP：192.168.152.151 192.168.152.152

 

三、负载均衡器安装配置

1）安装

#yum -y install ipvsadm

#lsmod | grep ip_vs 查看没有输出

#modprobe ip_vs 安装即可

2）配置，这里也是个写脚本为了方便vim /etc/init.d/lvsdr

 

#lvs of DR

VIP=192.168.152.250

RIP1=192.168.152.151

RIP2=192.168.152.152

case "$1" in

start)

echo "start lvs of DR"

/sbin/ifconfig eth0:0 $VIP broadcast $VIP netmask 255.255.255.0 up

echo "1" > /proc/sys/net/ipv4/ip_forward

/sbin/iptables -C

/sbin/ipvsadm -A -t $VIP:80 -s rr

/sbin/ipvsadm -a -t $VIP:80 -r $RIP1:80 -g

/sbin/ipvsadm -a -t $VIP:80 -r $RIP2:80 -g

/sbin/ipvsadm

;;

stop)

echo "stop lvs of DR"

echo "0" > /proc/sys/net/ipv4/ip_forward

/sbin/ipvsadm -C

/sbin/ifconfig eth0:0 down

;;

*)

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

exit1

esac

#chmod o+x /etc/init.d/lvsdr

#service lvsdr start

三、节点服务器配置

这里我们也都可以写成脚本，这里我就举web1了，web2也是一样的。

#vim /etc/init.d/lvsdrrip

#!/bin/bash

#DR server

VIP=192.168.152.250

case "$1" in

start)

echo "start LVS of DR"

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

/sbin/route add -host $VIP dev lo:0

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)

echo "stop LVS of DR"

/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

注：DR模式VIP必须跟服务器同一网段

echo"1";echo"2" 是为了抑制arp广播作用

#chmod o+x /etc/init.d/lvsdr

#service lvsdrrip start

四、验证

在负载均衡器上我们查看下

# ipvsadm -ln

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.152.250:80 rr

-> 192.168.152.152:80 Route 1 0 1

-> 192.168.152.151:80 Route 1 0 1

下面我们访问一下看看：

这里我们可以看到试验成功了。

我们最后在看下节点服务器的信息，看多出了什么：

# ifconfig

eth0 Link encap:Ethernet HWaddr 00:0C:29:6E:B2:0F

inet addr:192.168.152.151 Bcast:192.168.152.255 Mask:255.255.255.0

inet6 addr: fe80::20c:29ff:fe6e:b20f/64 Scope:Link

UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1

RX packets:4696 errors:0 dropped:0 overruns:0 frame:0

TX packets:3535 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:1000

RX bytes:447778 (437.2 KiB) TX bytes:470257 (459.2 KiB)

Interrupt:177 Base address:0x1424

 

lo Link encap:Local Loopback

inet addr:127.0.0.1 Mask:255.0.0.0

inet6 addr: ::1/128 Scope:Host

UP LOOPBACK RUNNING MTU:16436 Metric:1

RX packets:3746 errors:0 dropped:0 overruns:0 frame:0

TX packets:3746 errors:0 dropped:0 overruns:0 carrier:0

collisions:0 txqueuelen:0

RX bytes:868823 (848.4 KiB) TX bytes:868823 (848.4 KiB)

 

lo:0 Link encap:Local Loopback

inet addr:192.168.152.250 Mask:255.255.255.255

UP LOOPBACK RUNNING MTU:16436 Metric:1