LVS +Keepalived的DR模式

LVS+Keepalived的安装部署

前端调度master：IP->10.252.3.10

前端调度backup：IP->10.252.3.11

VIP：10.252.3.12

RealServer:10.252.3.15

RealServer:10.252.3.16

1:主备一起安装keepalivedipvsadm

yum installkeepalived ipvsadm y

注：使用ipvsadm Ln可以来查看LVS的调度情况

====================================================================================

2：配置/etc/keepalived/keepalived.conf

主机10.252.3.10配置如下:

vrrp_instanceVI_1 {

state MASTER #主备的区别点，标识

interface eth1 #对应的网卡

virtual_router_id 60

priority 101 #优先级，谁做主(值越大，优先级越高)

advert_int 2

authentication { #验证方式，以及密码必须主备一样

auth_type PASS

auth_pass 1234 #相对应的密码

}

virtual_ipaddress { #切换方式。切换虚拟IP

10.252.3.12/4

}

}

Virtual_server10.252.3.12 80 { #对应的端口可以在这里修改

delay loop 6 #健康检查时间

lb_algo rr #均衡调度算法一共有十二种。这里采用轮询的方法

lb_kind DR #负载均衡转发规则有三种：NAT，DR，TUN

real_server 10.252.3.15 80 {

weight 3

TCP_CHECK { #tcp的轮询检查设置

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

}

real_server 10.252.3.16 80 {

weight 3

TCP_CHECK { #tcp的轮询检查设置

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

connect_port 80

}

}

}

备机配置: 10.252.3.11

Backup的keepalived配置主要是修改两个地方，其他的都一样：

state BACKUP #主备的区别点，标识

priority 100 #优先级，谁做主(值越大，优先级越高)

====================================================================================

3:在realserver上运行脚本

由于使用的方式为DR，我们需要在实际虚拟机上部署DIP地址与VIP地址进行通信

编写lvs_init.sh的脚本如下所示,后端两台虚拟机的lvs_init的脚本都一样：

#!/bin/bash

#description: Config realserver lo and apply noarp

SNS_VIP= 10.252.3.12

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

case"$1" in

start)

ifconfig lo:0 $SNS_VIP netmask255.255.255.255 broadcast $SNS_VIP up#设置lo:0的IP地址

/sbin/route add -host $SNS_VIP dev lo:0 #添加路由

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

sysctl -p >/dev/null 2>&1 #更新配置

echo "RealServer Start OK"

;;

stop)

ifconfig lo:0 down

route del $SNS_VIP >/dev/null2>&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

给脚本权限 chmod +x /data/script/lvs_init.sh

./lvs_init start/stop 运行和停止脚本

Service keepalived start

使用ipvsadm Ln来查看lvs负载均衡，可以使用webbech来测试。

CentOS 6.3下Haproxy+Keepalived+Apache配置笔记 http://www.linuxidc.com/Linux/2013-06/85598.htm

Haproxy + KeepAlived 实现WEB群集 on CentOS 6 http://www.linuxidc.com/Linux/2012-03/55672.htm

Keepalived+Haproxy配置高可用负载均衡 http://www.linuxidc.com/Linux/2012-03/56748.htm

Haproxy+Keepalived构建高可用负载均衡 http://www.linuxidc.com/Linux/2012-03/55880.htm

CentOS 7 上配置LVS + Keepalived + ipvsadm http://www.linuxidc.com/Linux/2014-11/109237.htm

LVS/DR + Keepalived搭建负载均衡集群 http://www.linuxidc.com/Linux/2015-06/118647.htm

LVS+Keepalived实现四层负载及高可用 http://www.linuxidc.com/Linux/2015-02/112695.htm

LVS+Keepalived高可用负载均衡集群架构实验 http://www.linuxidc.com/Linux/2015-01/112560.htm

Heartbeat+LVS构建高可用负载均衡集群 http://www.linuxidc.com/Linux/2014-09/106964.htm

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