                                ++++++++++++   
                         + Client +   192.168.122.1/24 (真实机做客户端)
                               ++++++++++++   
                                       |
                                       |
                               ++++++++++++     192.168.122.254/24
                                  + HAproxy +
                                  ++++++++++++   
                                        |
                ________________________|_______________________
     __________|____________                    __________|________            
    |                      |                    |                  |
++++++++++++        ++++++++++++     ++++++++++++           ++++++++++++        
+ HTML   A  +      + HTML  B   +       + PHP   A  +          +  PHP B  +
++++++++++++        ++++++++++++        ++++++++++++         ++++++++++++
eth0 192.168.122.10/24     eth0 192.168.122.20/24    eth0 192.168.122.30/24        eth0 192.168.122.40/24

HTML A & HTML B

[root@localhost ~]# yum install httpd
分别创建测试页面 index.html ,开启服务

PHP A & php B

[root@localhost ~]# yum install httpd php
分别创建测试页面 index.php ,开启服务

安装HAproxy

[root@localhost ~]# tar xf haproxy-1.4.20.tar.gz
[root@localhost ~]# cd haproxy-1.4.20
[root@localhost haproxy-1.4.20]# make TARGET=linux26 PREFIX=/usr/local/haproxy install

生成HAproxy配置文件

[root@localhost haproxy-1.4.20]# cd /usr/local/haproxy/
[root@localhost haproxy]# mkdir conf logs
[root@localhost haproxy]# cd conf/
[root@localhost conf]# vim haproxy.cfg
===================================================================
global
    log 127.0.0.1 local3 info        #日志服务器
    maxconn 4096                #单个进程的最大并发连接数
    uid nobody                #用户身份
    gid nobody                #组身份
    daemon                    #守护进程方式后台运行
    nbproc 1                #工作进程数量


defaults
    log        global
    mode    http        #工作模式 http ,tcp 是 4 层,http是 7 层    
    maxconn 2048        #最大连接数
    retries     3    #3 次连接失败就认为服务器不可用
    option    redispatch    #如果 cookie 写入了 serverId 而客户端不会刷新 cookie,当serverId 对应的服务器挂掉后,强制定向到其他健康的服务器
    stats    uri  /haproxy    #使用浏览器访问 http://192.168.122.254/haproxy,可以看到服务器状态
    contimeout    5000
    clitimeout    50000
    srvtimeout    50000


frontend http-in
    bind 0.0.0.0:80
    mode http
    log global
    option httplog
    option httpclose        #打开支持主动关闭功能        
     acl php url_reg  -i  \.php$    #acl <ACL名字>  <类型>  <大小写>  <规则>
     acl html url_reg  -i  \.html$    #use_backend  <服务器组>  if  <ACL名字>
     use_backend php-server if  php
     use_backend html-server if  html
     default_backend html-server    #默认使用的服务器组


backend php-server
    mode http
    balance roundrobin                    #负载均衡的方式
    option httpchk GET /index.php                #健康检查
    cookie SERVERID insert indirect nocache     #客户端的 cookie 信息
    server php-A 192.168.122.30:80 weight 1 cookie 1 check inter 2000 rise 2 fall 5
    server php-B 192.168.122.40:80 weight 1 cookie 2 check inter 2000 rise 2 fall 5
    #cookie 1 标识 serverid 为 1
    #check inter 2000 检测心跳频率
    #rise 2 2 次正确认为服务器可用
    #fall 5 5 次失败认为服务器不可用

backend html-server
    mode http
    balance roundrobin
    option httpchk GET /index.html
    cookie SERVERID insert indirect nocache
    server html-A 192.168.122.10:80 weight 1 cookie 3 check inter 2000 rise 2 fall 5
    server html-B 192.168.122.20:80 weight 1 cookie 4 check inter 2000 rise 2 fall 5

启动HAproxy

[root@localhost conf]# /usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/conf/haproxy.cfg

查看HAproxy状态

[root@localhost conf]# firefox http://localhost/haproxy

在客户端访问 HAproxy 测试

[root@localhost ~]# elinks –dump http:// 192.168.122.254
[root@localhost ~]# elinks –dump http:// 192.168.122.254/index.html
[root@localhost ~]# elinks –dump http:// 192.168.122.254/index.php

Haproxy

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