centos 6.2 LVS+Keepalived搭建集群环境

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
esac2、在MASTER、BACKUP两台虚拟机添加可执行文件realserver,内容如下

#!/bin/bash
#description : start realserverVIP=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。