基于Haproxy+Keepalived构建高可用负载均衡集群

实验环境：

主机名	IP地址
VIP	192.168.200.254
Haproxy-1	192.168.200.101
Haproxy-2	192.168.200.102
Nginx1	192.168.200.103
Nginx2	192.168.200.104

1、在Nginx1/2上编译安装nginx服务
1.1 首先安装Nginx1

[root@Nginx-1 ~]# yum -y install gcc gcc-c++ make pcre-devel zlib-devel

[root@Nginx-1 ~]# useradd -M -s /sbin/nologin  nginx

[root@Nginx-1 ~]# tar xf nginx-1.6.2.tar.gz -C /usr/src

[root@Nginx-1 ~]# cd /usr/src/nginx-1.6.2

[root@Nginx-1 nginx-1.6.2]# ./configure --prefix=/usr/local/nginx --user=nginx --group=nginx && make && make install

[root@Nginx-1 nginx-1.6.2]# cd /usr/local/nginx/html/

[root@Nginx-1 html]# echo "server 192.168.200.103" > index.html

[root@Nginx-1 html]# /usr/local/nginx/sbin/nginx

[root@Nginx-1 html]# netstat -anpt |grep nginx

tcp        0      0 0.0.0.0:80                  0.0.0.0:*                   LISTEN      4503/nginx

1.2 安装Nginx2，同Nginx1搭建方式是一样的。
与Nginx1唯一不同的是：

[root@Nginx-2 html]# echo "server 192.168.200.104" > index.html

2、安装Haproxy-1与Haproxy-2 两台机器配置一致：

[root@Haproxy-1 ~]# yum -y install gcc gcc-c++ make pcre-devel bzip2-devel

[root@Haproxy-1 ~]# tar xf haproxy-1.4.24.tar.gz -C /usr/src/

[root@Haproxy-1 ~]# cd /usr/src/haproxy-1.4.24/

[root@Haproxy-1 haproxy-1.4.24]# make TARGET=linux26 && make install

2.1 Haproxy服务器配置
建立haproxy的配置目录及文件

[root@Haproxy-1 haproxy-1.4.24]# mkdir /etc/haproxy

[root@Haproxy-1 haproxy-1.4.24]# cp examples/haproxy.cfg /etc/haproxy/

2.2 haproxy配置项的介绍
haproxy的配置文件通常分为三部分: global（全局配置部分） defaults（默认配置部分） listen(应用组件部分)

[root@Haproxy-1 ~]# vim /etc/haproxy/haproxy.cfg

# this config needs haproxy-1.1.28 or haproxy-1.2.1

global

	log 127.0.0.1	local0

	log 127.0.0.1	local1 notice

	#log loghost	local0 info

	maxconn 4096

	#chroot /usr/share/haproxy

	uid 99

	gid 99

	daemon

	#debug

	#quiet

defaults

	log	global

	mode	http

	option	httplog

	option	dontlognull

	retries	3

	#redispatch

	maxconn	2000

	contimeout	5000

	clitimeout	50000

	srvtimeout	50000

listen	web-cluster 0.0.0.0:80

	option httpchk GET /index.html

	balance	roundrobin

	server	inst1 192.168.200.103:80 check inter 2000 fall 3

	server	inst2 192.168.200.104:80 check inter 2000 fall 3

2.3 创建自启动脚本

[root@Haproxy-1 ~]# cp /usr/src/haproxy-1.4.24/examples/haproxy.init /etc/init.d/haproxy

[root@Haproxy-1 ~]# ln -s /usr/local/sbin/haproxy /usr/sbin/haproxy

[root@Haproxy-1 ~]# chmod +x /etc/init.d/haproxy

[root@Haproxy-1 ~]# /etc/init.d/haproxy start

Starting haproxy:                                          [确定]

2.4 客户端访问测试：

用浏览器打开 http://192.168.200.101 打开一个新的浏览器再次访问 http://192.168.200.101

用浏览器打开 http://192.168.200.102 打开一个新的浏览器再次访问 http://192.168.200.102

可以验证两次访问到的结果分别为：

server 192.168.200.103

server 192.168.200.104

3、编译安装keepalived服务

[root@Haproxy-1 ~]# yum -y install kernel-devel openssl-devel popt-devel

[root@Haproxy-1 ~]# tar xf keepalived-1.2.13.tar.gz

[root@Haproxy-1 ~]# cd keepalived-1.2.13

[root@Haproxy-1 keepalived-1.2.13]# ./configure --prefix=/ --with-kernel-dir=/usr/src/kernels/2.6.18-194.el5-i686 && make && make install

3.1 配置keepalibed 开机启动脚本

[root@Haproxy-1 ~]# chkconfig --add keepalived

[root@Haproxy-1 ~]# chkconfig keepalived on

[root@Haproxy-1 ~]# chkconfig --list keepalived

3.2.1 配置keepalibed 主配置文件

[root@Haproxy-1 ~]# vim /etc/keepalived/keepalived.conf

! Configuration File for keepalived

vrrp_script chk_http_port {

script "/etc/keepalived/check_haproxy.sh"

interval 2

global_defs {

router_id LVS_DEVEL

}

vrrp_instance VI_1 {

state MASTER

interface eth0

virtual_router_id 51

priority 100

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

track_script {

chk_http_port

}

virtual_ipaddress {

192.168.200.254

}

}

}

3.2.2 第二台Haproxy配置keepalibed 主配置文件

[root@Haproxy-2 ~]# cat /etc/keepalived/keepalived.conf

! Configuration File for keepalived

vrrp_script chk_http_port {

script "/etc/keepalived/check_haproxy.sh"

interval 2

weight 2

global_defs {

router_id LVS_DEVEL

}

vrrp_instance VI_1 {

state BACKUP

interface eth0

virtual_router_id 51

priority 50

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

track_script {

chk_http_port

}

virtual_ipaddress {

192.168.200.254

}

}

}

4、两台机器上都配置haproxy检测脚本

[root@Haproxy-1 ~]# cat /etc/keepalived/check_haproxy.sh

#!/bin/bash

num=`ps -C haproxy --no-header |wc -l`

if [ $num -eq 0 ]

then

	/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/conf/haproxy.cfg

	sleep 3

	if [ `ps -C haproxy --no-header |wc -l` -eq 0 ]

	then

		/etc/init.d/keepalived stop

	fi

fi

[root@Haproxy-1 ~]# chmod +x /etc/keepalived/check_haproxy.sh

[root@Haproxy-1 ~]# service keepalived start

[root@Haproxy-2 ~]# service keepalived start

5.1、测试VIP地址

[root@Haproxy-1 ~]# ip addr show dev eth0

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 00:0c:29:cc:18:a2 brd ff:ff:ff:ff:ff:ff

    inet 192.168.200.101/24 brd 192.168.200.255 scope global eth0

    inet 192.168.200.254/32 scope global eth0

    inet6 fe80::20c:29ff:fecc:18a2/64 scope link

       valid_lft forever preferred_lft forever

[root@Haproxy-1 ~]# /etc/init.d/keepalived stop

停止 keepalived：                                          [确定]

[root@Haproxy-2 ~]# ip addr show dev eth0

2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000

    link/ether 00:0c:29:fd:8a:4e brd ff:ff:ff:ff:ff:ff

    inet 192.168.200.102/24 brd 192.168.200.255 scope global eth0

    inet 192.168.200.254/32 scope global eth0

    inet6 fe80::20c:29ff:fefd:8a4e/64 scope link

       valid_lft forever preferred_lft forever

5.2、测试Haproxy健康检查

[root@Haproxy-1 ~]# service haproxy stop

Shutting down haproxy:                                     [确定]

[root@Haproxy-1 ~]# service haproxy status

haproxy (pid 59717) 正在运行...

5.3 网页测试：
用浏览器打开 http://192.168.200.254
再次打开一个新的浏览器再次访问 http://192.168.200.254

可以验证两次访问到的结果分别为：
server 192.168.200.103
server 192.168.200.104

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基于Haproxy+Keepalived构建高可用负载均衡集群

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