LVS+DR+Keepalived 安装配置

一：安装配置 LVS+DR+Keepalived


负载服务器master真实IP 192.168.1.106

负载服务器backup真实IP 192.168.1.114

负载服务器虚拟IP 192.168.1.10

后端WEB服务器IP 192.168.1.50

后端WEB服务器IP 192.168.1.60

系统：Redhat 5.4 x86 内核：2.6.18-164.el5

1.下载所需要的软件：ipvsadm keepalived

wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.24.tar.gz
wget http://www.keepalived.org/software/keepalived-1.1.18.tar.gz
2.安装ipvsadm(负载均衡器都要配置master和backup)

A．建立内核快捷方式：

ln –s /usr/src/kernels/2.6.18-164.e15-i686 /usr/src/linux

B.解压ipvsadm，编译ipvsadm

tar zxvf ipvsadm-1.24.tar.gz

cd ipvsadm-1.24

make ; make install

C.显示如下：

[root@master ~]# /sbin/ipvsadm -v

ipvsadm v1.24 2005/12/10 (compiled with popt and IPVS v1.2.1)

则Ipvsadm安装成功

3.安装keepalived负载均衡器都要配置master和backup)

tar zxvf keepalived-1.1.18tar.gz

cd keepalived-1.1.18

./configure --prefix=/usr/local/keepalived

make ; make install

cp etc/rc.d/init.d/keepalived /etc/rc.d/init.d/

cp etc/sysconfig/keepalived /etc/sysconfig/

mkdir /etc/keepalived

cp etc/keepalived/keepalived.conf /etc/keepalived/

cp sbin/keepalived /usr/sbin/

启动keepalived

service keepalived start|stop|restart

4.配置master和backup

A．开启ip_forward 转发功能：

sysctl –w net.ipv4.ip_forward = 1

B．配置keepalived.conf 配置文件

Vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

global_defs {

notification_email {

crazyunix@139.com #

}

notification_email_from crazyunix@139.com

smtp_server smtp.139.com

# smtp_connect_timeout 30

router_id LVS_DEVEL

}

vrrp_instance VI_1 {

state MASTER #备份服务器上将MASTER改为BACKUP
interface eth0 #HA监测网络接口

virtual_router_id 51 #主、备机的virtual_router_id必须相同

priority 90 #主、备机取不同的优先级，主机值较大，备份机值较小

advert_int 1 #VRRP Multicast广播周期秒数

authentication {

auth_type PASS #VRRP认证方式

auth_pass 1111 #VRRP口令字

}

virtual_ipaddress {

192.168.1.10 #(如果有多个VIP，继续换行填写.)

}

}

virtual_server 192.168.1.10 80 {

delay_loop 2 #每隔2秒查询realserver状态

lb_algo rr #lvs 算法

lb_kind DR #Direct Route

persistence_timeout 50 #同一IP的连接60秒内被分配到同一台realserver

protocol TCP #用TCP协议检查realserver状态

real_server 192.168.1.50 80 {

weight 100

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

real_server 192.168.1.60 80 {

weight 1

TCP_CHECK {

connect_timeout 3

nb_get_retry 3

delay_before_retry 3

}

}

}

BACKUP服务器同上配置，先安装lvs再按装keepalived,仍后配置/etc/keepalived/keepalived.conf，只需将红色标示的部分改一下即可.

5.配置 VIP:

vim /etc/sysconfig/network-scripts/ifcfg-lo:0

DEVICE=lo:0

IPADDR=192.168.1.10

NETMASK=255.255.255.255

ONBOOT=yes

NAME=loopback

重启网卡，启动keepalived 显示如下成功！

6.配置ipvsadm（配置master和backup）

添加负载均衡器

/sbin/ipvsadm -A -t 192.168.1.10:80 -s rr

增加realserver

/sbin/ipvsadm -a –t 192.168.1.10:80 -r 192.168.1.50:80 -g #192.168.1.50 是真实机的ip

/sbin/ipvsadm -a –t 192.168.1.10:80 -r 192.168.1.60:80 -g #192.168.1.60 是真实机的ip

route add -host 192.168.1.10 dev lo:0

7.配置realserver （web1和web2）

配置vip 地址

/sbin/ifconfig lo:0 192.168.1.10 netmask 255.255.255.255 broadcast 192.168.1.10 up

route add -host 192.168.1.10 dev lo:0

8.在realserver 安装测试httpd（只为显示结果）

yum install httpd –y

service httpd start

vim /var/www/html/index.html

this is 192.168.1.50/60





9.在master负载均衡器上查看

[root@master ~]# ipvsadm -L -n

IP Virtual Server version 1.2.1 (size=4096)

Prot LocalAddress:Port Scheduler Flags

-> RemoteAddress:Port Forward Weight ActiveConn InActConn

TCP 192.168.1.10:80 rr persistent 50

-> 192.168.1.60:80 Route 1 0 0

-> 192.168.1.50:80 Route 100 0 0

10．访问：192.168.1.10 出现一下表示安装成功





刷新几次。

当master服务器down的时候，backup自动会接替服务，当master起来的时候，backup会自动断掉。
本文出自 “奋斗的小子” 博客，请务必保留此出处http://crazyming.blog.51cto.com/1048571/496526