centos 6.2 LVS+Keepalived搭建集群环境

原文链接： http://www.cnblogs.com/heroking2000/archive/2012/06/17/2552750.html

因为没有其他机器来搭建集群环境，我只能在我的小本上安装虚拟机来模拟集群环境了，先介绍下网络环境：

虚拟机1：192.168.1.6 eth0 MASTER CentOS 6.2

虚拟机2：192.168.1.8 eth2 BACKUP CentOS 6.2

VIP：192.168.1.10

1、分别在两台虚拟机上安装keepalived、ipvsadm、apache安装细节就不说了，网上都有。

2、在MASTER虚拟机上添加可执行文件lvs_dr,BACKUP稍有区别，内容如下

#!/bin/sh

VIP= 192.168. 1.10    #Virtual IP

RIP1= 192.168. 1.6    #Real Server IP

RIP2= 192.168. 1.8    #Real Server IP

/etc/rc.d/init.d/functions

case " $1 " in

    start)

echo " start LVS of DR "

/sbin/ifconfig eth0: 0 $VIP broadcast $VIP netmask 255.255. 255.255 up    #注意子网掩码，BACKUP是eth2

/sbin/route add -host $VIP dev eth0: 0   #BACKUP是eth2

/sbin/ipvsadm -C

/sbin/ipvsadm -A -t $VIP: 80 -s rr

/sbin/ipvsadm -a -t $VIP: 80 -r $RIP1: 80 -g

/sbin/ipvsadm -a -t $VIP: 80 -r $RIP2: 80 -g

/sbin/ipvsadm

;;

    stop)

echo " close LVS of DR "

/sbin/ifconfig eth0: 0 down   #BACKUP是eth2

/sbin/ipvsadm -C

;;

    *)

echo " Usage:$0{start|stop} "

exit 1
esac

2、在MASTER、BACKUP两台虚拟机添加可执行文件realserver,内容如下

#!/bin/bash

#description : start realserver

VIP=192.168.1.10
/etc/rc.d/init.d/functions
case "$1" in
start)
echo " start LVS of REALServer"
/sbin/ifconfig lo:0 $VIP broadcast $VIP netmask 255.255.255.255 up
echo "1" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "1" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "2" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
stop)
/sbin/ifconfig lo:0 down
echo "close LVS Directorserver"
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/lo/arp_announce
echo "0" >/proc/sys/net/ipv4/conf/all/arp_ignore
echo "0" >/proc/sys/net/ipv4/conf/all/arp_announce
;;
*)
echo "Usage: $0 {start|stop}"
exit 1
esac

3、在MASTER修改配置文件keepalived.conf文件，BAKUP上稍有不同，如下

! Configuration File for keepalived

global_defs {
   notification_email {
<to email address> #该处为提醒邮箱地址
   }
   notification_email_from <from email address> #该处是提醒邮箱发送地址
   smtp_server <smtp server> #邮件服务器
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_instance VI_1 {
    state MASTER #BACKUP是BACKUP
     interface eth0 #BACKUP是eth2
    virtual_router_id 51
    priority 100 #BACKUP是99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
         192.168. 1.10
    }
}

virtual_server 192.168. 1.10 80 {
    delay_loop 6
    lb_algo wlc
    lb_kind DR
    persistence_timeout 50
    protocol TCP

    real_server 192.168. 1.6 80 {
        weight 3
        TCP_CHECK {
        connect_port 80
        connect_timeout 30
        }
    }
    real_server 192.168. 1.8 80 {
        weight 1
        TCP_CHECK {
        connect_port 80
        connect_timeout 30
        }
    } }

4、在MASTER上，编辑/var/www/html/readme.html

this is 192.168.1.6

在BACKUP上，编辑/var/www/html/readme.html

this is 192.168.1.8

以示区别

5、在MASTER、BACKUP开启Apache、keealived等

# /etc/init.d/httpd start

# /etc/init.d/keepalived start

# /root/realserver start
# /root/lvs-dr start

6、在宿主机上ping通192.168.1.10，但无法访问http://192.168.1.10/readme.html ，后来发现是防火墙问题，开启后，就可以了。可以分别关闭两台虚拟机在验证集群效果。

转载于:https://www.cnblogs.com/heroking2000/archive/2012/06/17/2552750.html

centos 6.2 LVS+Keepalived搭建集群环境

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