基于Keepalived+Haproxy搭建四层负载均衡器

一、前言
       Haproxy是稳定、高性能、高可用性的负载均衡解决方案，支持HTTP及TCP代理后端服务器池，因支持强大灵活的7层acl规则，广泛作为HTTP反向代理。本文则详细介绍如何利用它的四层交换与Keepalived实现一个负载均衡器，适用于Socket、ICE、Mail、Mysql、私有通讯等任意TCP服务。系统架构图如下：

二、平台环境

引用

OS:Centos5.4(64X)
MASTER:192.168.0.20
BACKUP:192.168.0.21
VIP:192.168.0.100
Serivce Port:11231

三、平台安装配置
1、添加非本机IP邦定支持

引用

#vi /etc/sysctl.conf
net.ipv4.ip_nonlocal_bind=1
#sysctl p

2、配置平台日志支持

引用

#vi /etc/syslog.conf
添加：
local3.*        /var/log/haproxy.log
local0.*        /var/log/haproxy.log

#vi /etc/sysconfig/syslog
修改：
SYSLOGD_OPTIONS="-r -m 0"
#/etc/init.d/syslog restart

3、关闭SELINUX

引用

vi /etc/sysconfig/selinux
修改：
SELINUX=disabled
#setenforce 0

4、配置iptables，添加VRRP通讯支持

引用

iptables -A INPUT -d 224.0.0.18 -j ACCEPT

5、Keepalived的安装、配置

引用

#mkdir -p /home/install/keepalivedha
#cd /home/install/keepalivedha
#wget http://www.keepalived.org/software/keepalived-1.2.2.tar.gz
#tar zxvf keepalived-1.2.2.tar.gz
#cd keepalived-1.2.2
#./configure
#make && make install

引用

#cp /usr/local/etc/rc.d/init.d/keepalived /etc/rc.d/init.d/
#cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/
#mkdir /etc/keepalived
#cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/
#cp /usr/local/sbin/keepalived /usr/sbin/

#vi /etc/keepalived/keepalived.conf

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! Configuration File for keepalived   
  
global_defs {   
   notification_email {   
         liutiansi@gmail.com   
   }   
   notification_email_from liutiansi@gmail.com   
   smtp_connect_timeout 3   
   smtp_server 127.0.0.1   
   router_id LVS_DEVEL   
}   
vrrp_script chk_haproxy {   
    script "killall -0 haproxy"  
    interval 2   
    weight 2   
}   
vrrp_instance VI_1 {   
    interface eth1   
    state MASTER # 从为"BACKUP"  
    priority 101 # 从为100   
    virtual_router_id 50 #路由ID，可通过#tcpdump vrrp查看。   
    garp_master_delay 1 #主从切换时间，单位为秒。   
  
    authentication {   
        auth_type PASS   
        auth_pass KJj23576hYgu23IP   
    }   
    track_interface {   
       eth0   
       eth1   
    }   
    virtual_ipaddress {   
        192.168.0.100   
    }   
    track_script {   
        chk_haproxy   
    }   
  
    #状态通知   
    notify_master "/etc/keepalived/Mailnotify.py master"  
    notify_backup "/etc/keepalived/Mailnotify.py backup"  
    notify_fault "/etc/keepalived/Mailnotify.py fault"  
}  
! Configuration File for keepalived

global_defs {
   notification_email {
         liutiansi@gmail.com
   }
   notification_email_from liutiansi@gmail.com
   smtp_connect_timeout 3
   smtp_server 127.0.0.1
   router_id LVS_DEVEL
}
vrrp_script chk_haproxy {
    script "killall -0 haproxy"
    interval 2
    weight 2
}
vrrp_instance VI_1 {
    interface eth1
    state MASTER # 从为"BACKUP"
    priority 101 # 从为100
    virtual_router_id 50 #路由ID，可通过#tcpdump vrrp查看。
    garp_master_delay 1 #主从切换时间，单位为秒。

    authentication {
        auth_type PASS
        auth_pass KJj23576hYgu23IP
    }
    track_interface {
       eth0
       eth1
    }
    virtual_ipaddress {
        192.168.0.100
    }
    track_script {
        chk_haproxy
    }

    #状态通知
    notify_master "/etc/keepalived/Mailnotify.py master"
    notify_backup "/etc/keepalived/Mailnotify.py backup"
    notify_fault "/etc/keepalived/Mailnotify.py fault"
}

6、Haproxy的安装与配置

引用

#cd /home/install/keepalivedha
#wget http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.11.tar.gz
#tar -zxvf haproxy-1.4.11.tar.gz
#cd haproxy-1.4.11
#make install
#mkdir -p /usr/local/haproxy/etc
#mkdir -p /usr/local/haproxy/sbin
#cp examples/haproxy.cfg /usr/local/haproxy/etc
#ln -s /usr/local/sbin/haproxy /usr/local/haproxy/sbin/haproxy

#vi /usr/local/haproxy/etc/haproxy.cfg

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# 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   
        maxconn 5000   
        uid 99   
        gid 99   
        daemon   
        pidfile /usr/local/haproxy/haproxy.pid   
  
  
defaults   
        log     global   
        mode    http