HAProxy基于KeepAlived实现Web高可用及动静分离

#系统环境：CentOS6.6
#Static Server：httpd
#Dynamic Servicer:LAMP

[root@node1 ~]# ntpdate cn.pool.ntp.org

[root@node1 ~]# vim /etc/hosts

172.16.10.123   node1.scholar.com node1
172.16.10.124   node2.scholar.com node2

[root@node1 ~]# vim /etc/sysconfig/network
HOSTNAME=node1.scholar.com

[root@node1 ~]# uname -n
node1.scholar.com
#两个节点都需如上操作

[root@node1 ~]# ssh-keygen -t rsa -P ''
[root@node1 ~]# ssh-copy-id -i .ssh/id_rsa.pub root@node2
[root@node2 ~]# ssh-keygen -t rsa -P ''
[root@node2 ~]# ssh-copy-id -i .ssh/id_rsa.pub root@node1
[root@node1 ~]# date; ssh node2 'date' #测试
Wed Jun 24 15:58:46 CST 2015
Wed Jun 24 15:58:46 CST 2015

[root@node1 ~]# yum install keepalived haproxy -y

#两个节点都安装

[root@node1 ~]# vim /etc/keepalived/keepalived.conf

vrrp_instance VI_1 {        #定义VRRP实例,实例名自定义
    state MASTER            #指定Keepalived的角色，MASTER为主服务器，BACKUP为备用服务器
    interface eth0          #指定HA监测的接口
    virtual_router_id 51    #虚拟路由标识(1-255)，在一个VRRP实例中主备服务器ID必须一样
    priority 100            #优先级，数字越大越优先，主服务器优先级必须高于备服务器
    advert_int 1            #设置主备之间同步检查时间间隔，单位秒
    authentication {        #设置验证类型和密码
        auth_type PASS      #验证类型
        auth_pass ab007     #设置验证密码，同一实例中主备密码要保持一致
    }
    virtual_ipaddress {     #定义虚拟IP地址
        192.168.12.21
    }
}

vrrp_instance VI_2 {
    state BACKUP
    interface eth0
    virtual_router_id 61
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass sr200
    }
    virtual_ipaddress {
        192.168.12.22
    }
}

[root@node1 ~]# scp /etc/keepalived/keepalived.conf node2:/etc/keepalived/
keepalived.conf                                        100%  787     0.8KB/s   00:00

[root@node2 ~]# vim /etc/keepalived/keepalived.conf

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 51
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass ab007
    }
    virtual_ipaddress {
        192.168.12.21
    }
}

vrrp_instance VI_2 {
    state MASTER
    interface eth0
    virtual_router_id 61
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass sr200
    }
    virtual_ipaddress {
        192.168.12.22
    }
}

[root@node1 ~]# vim /etc/haproxy/haproxy.cfg 

global
    # to have these messages end up in /var/log/haproxy.log you will
    # need to:
    #    by adding the '-r' option to the SYSLOGD_OPTIONS in
    #    /etc/sysconfig/syslog
    #
    # 2) configure local2 events to go to the /var/log/haproxy.log
    #   file. A line like the following can be added to
    #   /etc/sysconfig/syslog
    #
    #    local2.*                       /var/log/haproxy.log
    log         127.0.0.1 local2      #日志将通过rsyslog进行归档记录
    chroot      /var/lib/haproxy      #运行的安装路径
    pidfile     /var/run/haproxy.pid  #pid文件存放的位置
    maxconn     4000                  #最大连接
    user        haproxy               #运行haproxy的用户
    group       haproxy               #运行haprixy的组
    daemon                            #以后台模式运行haproxy
    # turn on stats unix socket
    stats socket /var/lib/haproxy/stats
#---------------------------------------------------------------------
# common defaults that all the 'listen' and 'backend' sections will
# use if not designated in their block
#---------------------------------------------------------------------
defaults
    mode                    http                #工作模式
    log                     global              #记录日志
    option                  httplog             #详细记录http日志
    option                  dontlognull         #不记录健康检查的日志信息
    option http-server-close                    #启用服务器端主动关闭
    option forwardfor       except 127.0.0.0/8  #传递客户端IP
    retries                 3                   #请求重试次数
    timeout http-request    10s                 #http请求超时时间
    timeout queue           1m                  #一个请求在队列里的超时时间
    timeout connect         10s                 #连接服务器超时时间
    timeout client          1m                  #客户端超时时间
    timeout server          1m                  #客户端超时时间
    timeout http-keep-alive 10s                 #持久连接超时时间
    timeout check           10s                 #心跳检测超时时间
    maxconn                 3000                #最大连接数
#---------------------------------------------------------------------
# main frontend which proxys to the backends
#---------------------------------------------------------------------
frontend  proxy *:80
    #定义ACL
    acl url_static       path_beg       -i /static /images /javascript /stylesheets
    acl url_static       path_end       -i .jpg .gif .png .css .js
    acl url_dynamic      path_end       _i .php .jsp
    use_backend dynamic          if url_dynamic   #调用后端服务器并检查ACL规则是否被匹配
    default_backend             static
#---------------------------------------------------------------------
# static backend for serving up images, stylesheets and such
#---------------------------------------------------------------------
backend static           #后端调度
    balance     source   #调度算法
    server      s1 172.16.10.125:80 inter 1500 rise 2 fall 3  check 
#----------------------------------------
listen statistics
    mode http                           #http 7 层模式
    bind *:8080                         #监听地址
    stats enable                        #启用状态监控
    stats auth admin:admin              #验证的用户与密码
    stats uri /admin?status             #访问路径
    stats hide-version                  #隐藏状态页面版本号
    stats admin if TRUE                 #如果验证通过了就允许登录
    stats refresh 3s                    #每3秒刷新一次
    acl allow src 192.168.12.0/24       #允许的访问的IP地址
    tcp-request content accept if allow #允许的地址段就允许访问
    tcp-request content reject          #拒绝非法连接
#---------------------------------------------------------------------
# round robin balancing between the various backends
#---------------------------------------------------------------------
backend dynamic
    balance     source
    server      s2 172.16.10.12:80 check inter 1500 rise 2 fall 3 
#check inter 1500是检测心跳频率
#rise2 2次正确认为服务器可用
#fall3 3次失败认为服务器不可用

[root@node1 ~]# scp /etc/haproxy/haproxy.cfg node2:/etc/haproxy/
haproxy.cfg                                       100% 4471     4.4KB/s   00:00

#static server
[root@scholar ~]# vim /var/www/html/index.html 

<h1>172.16.10.125</h1>

[root@scholar ~]# service httpd start
Starting httpd:                                            [  OK  ]

#dynamic server
[root@scholar ~]# vim /var/www/html/index.php

<h1>172.16.10.20</h>
<?php
     $link = mysql_connect('127.0.0.1','root','');
     if ($link)
       echo "Success...";
     else
       echo "Failure...";
     mysql_close();
     phpinfo();
?>

[root@scholar ~]# service httpd start
Starting httpd:                                            [  OK  ]
[root@scholar ~]# service mysqld start
Starting mysqld:                                           [  OK  ]

[root@node1 ~]# service haproxy start; ssh node2 'service haproxy start'
Starting haproxy:                                          [  OK  ]
Starting haproxy: [  OK  ]
[root@node1 ~]# service keepalived start; ssh node2 'service keepalived start'
Starting keepalived:                                       [  OK  ]
Starting keepalived: [  OK  ]

[root@node1 ~]# service haproxy stop
Stopping haproxy:                                          [  OK  ]
[root@node1 ~]# service keepalived stop
Stopping keepalived:                                       [  OK  ]