haproxy + keepalived 安装配置
备注：
web server：192.168.10.53
web server：192.168.10.81
haproxy + keepalived  1：192.168.10.124
haproxy + keepalived  1：192.168.10.94
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yum install -y gcc* gcc-c++* autoconf* automake* zlib* libxml* ncurses-devel* libgcrypt* libtool*
   groupadd haproxy
   useradd -g haproxy haproxy
mkdir /usr/local/haproxy
wget http://haproxy.1wt.eu/download/1.4/src/haproxy-1.4.20.tar.gz
cd /usr/src/haproxy-1.4.20/
mkdir conf
cd conf/
vim haproxy.cfg
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global
        log 127.0.0.1   local0
        maxconn 65535   #最大连接数
        chroot /usr/local/haproxy
        uid 500
        gid 500
        daemon
        #debug
        #quiet
        nbproc 1    #负载均衡的并发进程数
        pidfile /var/run/haproxy.pid
defaults
        log     global
        mode    http      #工作模式，目前支持3种（tcp/http/health）
        option  httplog   #日志类别
        option  dontlognull
        option  redispatch   #当serverid对应的服务器宕机后，强制定向到其他健康的服务器上
        log     127.0.0.1 local0
        retries 3             #重试次数
        maxconn 32000
        stats enable
        stats   uri     /haproxy-stats
        stats realm Haproxy\ Statistics #提示信息
        stats auth admin:admin   #用户认证/用户名、密码
        stats hide-version    #隐藏版本信息
        stats refresh 10s     #刷新时间
        contimeout      5000   #超时时间
        clitimeout      50000
        srvtimeout      50000
listen  appserver  *:80
        hash-type consistent
        balance  uri len 100
        option httpclose     #启用被动的http连接关闭
        server  web1-53 192.168.10.53  cookie 10 weight 3 check inter 2000 rise 2 fall 3
        server  web2-81 192.168.10.81  cookie 20 weight 3 check inter 2000 rise 2 fall 3
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/usr/local/haproxy/sbin/haproxy -f /usr/local/haproxy/conf/haproxy.cfg      # 启动haproxy服务
 
  yum -y install openssl openssl-devel
 wget http://www.keepalived.org/software/keepalived-1.1.19.tar.gz
cd /usr/src/keepalived-1.1.19/
./configure --prefix=/usr/local/keepalived
make
make install
cp /usr/local/keepalived/sbin/keepalived /usr/sbin/
cp /usr/local/keepalived/etc/sysconfig/keepalived /etc/sysconfig/
cp /usr/local/keepalived/etc/rc.d/init.d/keepalived /etc/init.d/
 mkdir /etc/keepalived
 cd /etc/keepalived/
vim keepalived.conf
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global_defs {
  notification_email {
    2669660794@qq.com
  }
  notification_email_from 2669660794@qq.com
  smtp_server smtp.exmail.qq.com
  smtp_connect_timeout 30
  router_id LVS_DEVEL
}
vrrp_instance VI_1 {
    state MASTER #从为BACKUP
    interface eth0
    virtual_router_id 50                                     #路由ID,可通过#tcpdump vrrp查看。
    mcast_src_ip 192.168.10.124
    priority 100                                                   #从为50
        advert_int 1                                           #(VRRP Multicast广播周期秒数)
    garp_master_delay 1                              #主从切换时间，单位为秒。
      authentication {
        auth_type PASS
        auth_pass wameide
    }
    track_interface {
       eth0   #其他要监测状态的接口
    }
    virtual_ipaddress {
        192.168.10.204
    }
  }
virtual_server 192.168.10.204 {
    delay_loop 20
    lb_algo rr
    lb_kind DR
    persistence_timeout 60
    protocol TCP
    real_server 192.168.10.124 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
        }
    }
    real_server 192.168.10.83 80 {
        weight 1
        TCP_CHECK {
            connect_timeout 3
        }
    }
}
 
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/etc/init.d/keepalived restart
 
backup机器在此就不重复了。按照上述文档里一样。只须稍微更改下里面的参数即可。