lvs+keepalived

一、简介

VS/NAT原理图：

lvs+keepalived

二、系统环境

实验拓扑：

lvs+keepalived

系统平台：CentOS 6.3

Kernel：2.6.32-279.el6.i686

LVS版本：ipvsadm-1.26

keepalived版本：keepalived-1.2.4

三、安装

0、安装LVS前系统需要安装popt-static，kernel-devel，make，gcc，openssl-devel，lftp，libnl*，popt*

1、在两台Director Server上分别配置LVS+Keepalived

LVS install -------------

[root@CentOS-LVS_MASTER ~]# wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.26.tar.gz

[root@CentOS-LVS_MASTER ~]# ln -s /usr/src/kernels/2.6.32-279.el6.i686//usr/src/linux/

[root@CentOS-LVS_MASTER ~]# tar zxvf ipvsadm-1.26.tar.gz

[root@CentOS-LVS_MASTER ~]# cd ipvsadm-1.26

[root@CentOS-LVS_MASTER ipvsadm-1.26]# make && make install

Keepalived install -------------

[root@CentOS-LVS_MASTER ~]# wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz

[root@CentOS-LVS_MASTER ~]# tar zxvf keepalived-1.2.4.tar.gz

[root@CentOS-LVS_MASTER ~]# cd keepalived-1.2.4

[root@CentOS-LVS_MASTER keepalived-1.2.4]# ./configure && make && make install

######### 将keepalived做成启动服务，方便管理##########

[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/init.d/

[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/sysconfig/keepalived /etc/sysconfig/

[root@CentOS-LVS_MASTER ~]# mkdir /etc/keepalived/

[root@CentOS-LVS_MASTER ~]# cp /usr/local/etc/keepalived/keepalived.conf /etc/keepalived/

[root@CentOS-LVS_MASTER ~]# cp /usr/local/sbin/keepalived /usr/sbin/

[root@CentOS-LVS_MASTER ~]# service keepalived start | stop

2、开启路由转发

[root@CentOS-LVS_MASTER ~]# vim /etc/sysctl.conf
net.ipv4.ip_forward = 1
[root@CentOS-LVS_MASTER ~]# sysctl -p

3、配置Keepalived

[root@CentOS-LVS_MASTER ~]# less /etc/keepalived/keepalived.conf


! Configuration File for keepalived

global_defs {

#   notification_email {

#     acassen@firewall.loc

#     failover@firewall.loc

#     sysadmin@firewall.loc

#   }

#   notification_email_from Alexandre.Cassen@firewall.loc

#   smtp_server 192.168.200.1

   smtp_connect_timeout 30

   router_id lvs2

}

vrrp_script check_arp {

    script "/etc/keepalived/check_arp.sh"

    interval 60

}

vrrp_instance VI_1 {

    state BACKUP

    interface eth0

    mcast_src_ip 10.46.109.163

    garp_master_delay 5

    nopreempt

    virtual_router_id 179

    priority 50

    advert_int 3

    authentication {

        auth_type PASS

        auth_pass ykt@179

    }

track_script {

         check_arp

             }

    virtual_ipaddress {

        10.46.109.179/27 dev eth0

    }

    notify_master /etc/keepalived/to_master.sh

    notify_backup /etc/keepalived/to_backup.sh

}

virtual_server 10.46.109.179 8080  {

     delay_loop 30

     lb_algo wlc

     lb_kind NAT

     persistence_timeout 30

     protocol TCP

     ha_suspend

real_server 10.46.109.164 8080 {

        weight 3

        TCP_CHECK {

           connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

real_server 10.46.109.165 8080 {

        weight 3

        TCP_CHECK {

           connect_timeout 3

            nb_get_retry 3

            delay_before_retry 3

        }

    }

}

BACKUP服务器同上配置，先安装lvs再安装keepalived，然后配置/etc/keepalived/keepalived.conf，只需将批注部分改一下即可。

4、分别在2台Real Server上面设置网关

把网关都设置成：192.168.10.10

5、在2台RealServer中分别配置HTTP

[root@WEB1 ~]# yum -y install httpd
[root@WEB1 ~]# cd /var/www/html/
[root@WEB1 html]# cat index.html
<h1>WEB1/192.168.10.4</h1>
[root@WEB1 html]# /etc/init.d/httpd start
另一台机器配置一样，过程略。

6、分别在CentOS-LVS_MASTER、CentOS-LVS_BACKUP上执行service keepalived start启动keepalived就可实现负载均衡及高可用集群了；

[root@CentOS-LVS_MASTER keepalived]# service keepalived start

lvs+keepalived