HAProxy+Keepalived高可用负载均衡配置

    前言* 随着负载均衡器的成熟，人们熟知的软件负载均衡如LVS、HAProxy，各方面性能不亚于硬件负载均衡，HAProxy提供高可用性、负载均衡以及基于TCP和HTTP应用的代理，支持虚拟主机，它是免费、快速并且可靠的一种解决方案。

HAProxy特别适用于那些负载特大的web站点，这些站点通常又需要会话保持或七层处理。

我们平时用的负载均衡LVS是基于四层，新型的大型互联网公司也在采用HAProxy，了解了haproxy大并发、七层应用等特点，那今天我们来研究一下HAProxy+Keepalived基于七层负载高可用负载均衡的配置。

一、系统环境：

系统版本：CentOS6.0 x86_64
HAProxy版本：1.4.21
Keepalived版本:1.2.1

Nginx版本：1.2.2
MASTER_IP:192.168.0.130
BACKUP_IP:192.168.0.131

VIP:192.168.0.133
WEB_1:192.168.0.134
WEB_2:192.168.0.135

二、HAProxy安装：

1）首先安装192.168.0.130上安装：

下载最新稳定版本: 1.4.21

cd /usr/src  ;wget http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.21.tar.gz

tar xzf haproxy-1.4.21.tar.gz &&cd haproxy-1.4.21 &&make TARGET=linux26 PREFIX=/usr/local/haproxy &&make install PREFIX=/usr/local/haproxy
安装完毕，在/usr/local/haproxy/目录下会看到三个目录：doc、sbin、share

2) 接下来配置HAProxy。

cd /usr/local/haproxy ;mkdir -p etc/

然后在/usr/local/haproxy/etc/下新建haproxy.cfg文件，这里拷贝haproxy配置文件：

global

        log 127.0.0.1   local0

        maxconn 65535

        chroot /usr/local/haproxy

        uid 99

        gid 99

        daemon

        nbproc 8

        pidfile /usr/local/haproxy/haproxy.pid


defaults

         log     127.0.0.1       local3

         mode   http

         option httplog

         option httpclose

         option dontlognull

         option forwardfor

         option redispatch

         retries 2

         maxconn 65535

         balance source

         stats   uri     /web-status

         contimeout      5000

         clitimeout      50000

         srvtimeout      50000



listen  chinaapp.sinaapp.com

        bind *:80

        mode http

        option httplog

        log global

        option httpchk HEAD /index.html HTTP/1.0

        server web1  192.168.0.134:80 weight 5  check inter 2000 rise 2 fall 3

        server web2  192.168.0.135:80 weight 5  check inter 2000 rise 2 fall 3

然后启动haproxy，如下执行启动命令：

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

[WARNING] 217/202150 (2857) : Proxy 'chinaapp.sinaapp.com': in multi-process mode, stats will be limited to process assigned to the current request.

会提示如上信息，nbproc进程如果设置为1则不会提示，如果想去掉这个提示可以修改编译文件即可。 在源码配置src/cfgparse.c找到如下行
if (nbproc > 1) { if (curproxy->uri_auth) { - Warning("Proxy '%s': in multi-process mode, stats will be limited to process assigned to the current request.\n",  + Warning("Proxy '%s': in multi-process mode, stats will be limited to the process assigned to the current request.\n",

三、安装Keepalived:

cd /usr/src ;

wget http://www.keepalived.org/software/keepalived-1.2.1.tar.gz

tar xzf keepalived-1.2.1.tar.gz

cd keepalived-1.2.1 &&

./configure –with-kernel-dir=/usr/src/kernels/2.6.32-71.el6.x86_64/  &&make &&make install

DIR=/usr/local/ ;cp $DIR/etc/rc.d/init.d/keepalived  /etc/rc.d/init.d/ && cp $DIR/etc/sysconfig/keepalived /etc/sysconfig/ && mkdir -p /etc/keepalived  && cp $DIR/sbin/keepalived /usr/sbin/

四、配置keepalived:

! Configuration File for keepalived

global_defs {

 notification_email {

     [email protected]

}

   notification_email_from [email protected]

   smtp_server 127.0.0.1

   smtp_connect_timeout 30

   router_id LVS_DEVEL

}

vrrp_script chk_haproxy {

   script "/data/sh/check_haproxy.sh"

   interval 2

   weight 2

}

# VIP1

vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    lvs_sync_daemon_inteface eth0

    virtual_router_id 151

    priority 100

    advert_int 5

    nopreempt

    authentication {

        auth_typePASS

        auth_pass 2222

    }

    virtual_ipaddress {

        192.168.0.133

    }

    track_script {

    chk_haproxy

   }

}

五、创建haproxy脚本：

设置可执行权限chmod +x check_haproxy.sh，内容如下：

#!/bin/bash

#auto check haprox process

#2012-8-12 wugk

killall -0 haproxy

  if

  [[ $? -ne 0 ]];then

  /etc/init.d/keepalived stop

  fi

BACKUP同样如上配置haproxy、keepalived，配置完修改优先级为90即可，然后启动。

六、测试haproxy+keepalived：

如图当手动kill 掉131的haproxy进程后，130的keepalived后台日志显示如下，并且访问VIP 192.168.0.133 正常访问：

访问haproxy status如下图：

本文参考煮酒兄http://andrewyu.blog.51cto.com/1604432/669491 HAProxy+Keepalived高可用负载均衡配置