LVS+Keepalived DR模式实现web负载均衡高可用

一、环境介绍：

lvs_master:192.168.1.18

lvs_backup:192.168.1.19

web1:192.168.1.16

web2:192.168.1.17

vip:192.168.1.20

二、安装：

在两台lvs上安装lvs+keepalived：

yum install lvsadm keepalived -y

在两台web服务器上安装nginx（安装配置略过）

配置keepalived：

主lvs上配置：

vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

jack_keyang@163.com

}

notification_email_from root@localhost.localdomain

smtp_server 127.0.0.1

smtp_connect_timeout 30

router_id LVS_1

}

vrrp_instance VI_1 {

state MASTER

interface eth0

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.1.20

}

}

virtual_server 192.168.1.20 80 {

delay_loop 6

lb_algo rr #lvs轮询方式

lb_kind DR #lvs工作方式

nat_mask 255.255.255.255

protocol TCP

real_server 192.168.1.16 80 {

weight 10

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

}

real_server 192.168.1.17 80 {

weight 10

TCP_CHECK {

connect_timeout 10

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

}

}

备lvs上只需修改红色部分即可：

state BACKUP

priority 90

以上部分为lvs机器配置结束

下面为web机器上配置脚本，主要为绑定vip并关闭arp响应

#!/bin/bash

VIP=192.168.1.20

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

case $1 in

start)

ifconfig lo:0 $VIP netmask 255.255.255.255 broadcast $VIP

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

echo "RealServer Start OK"

;;

stop)

ifconfig lo:0 down

route del $VIP > /dev/null 2>&1

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 "RealServer Stoped"

;;

*)

echo "Usage: $0 (start|stop)"

exit 1

esac

exit 0

因为都是使用内网IP，如果想在外网访问只需将VIP的80端口在路由器上映射即可





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