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源地址：http://www.cnblogs.com/mchina/archive/2012/08/27/2644391.html

一、简介

VS/NAT原理图：

二、系统环境

三、安装

~]# wget http://www.linuxvirtualserver.org/software/kernel-2.6/ipvsadm-1.26.tar.gz

~]# ln -s /usr/src/kernels/2.6.32-279.el6.i686//usr/src/linux/

~]# tar zxvf ipvsadm-1.26.tar.gz

~]# cd ipvsadm-1.26

ipvsadm-1.26]# make && make install

Keepalived install

~]# wget http://www.keepalived.org/software/keepalived-1.2.4.tar.gz

~]# tar zxvf keepalived-1.2.4.tar.gz

~]# cd keepalived-1.2.4

keepalived-1.2.4]# ./configure && make && make install

~]# cp /usr/local/etc/rc.d/init.d/keepalived /etc/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/

~]# service keepalived start | stop

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

~]# less /etc/keepalived/keepalived.conf

global_defs {

router_id LVS_MASTER            <span class="comment">#BACKUP上修改为LVS_BACKUP

}

vrrp_instance VI_1 {

state MASTER                   <span style="color: #000000;"><span class="comment">#BACKUP上修改为BACKUP

interface eth0

virtual_router_id 51

priority 100                   <span class="comment">#<span style="color: #000000;"><span style="color: #000000;"><span class="comment">BACKUP上修改为80

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

10.0.0.227

}

}
vrrp_instance LAN_GATEWAY {

state MASTER                   <span style="color: #000000;"><span class="comment">#BACKUP上修改为LVS_BACKUP

interface eth1

virtual_router_id 52

priority 100                   <span style="color: #000000;"><span class="comment">#<span style="color: #000000;"><span style="color: #000000;"><span class="comment">BACKUP上修改为80

advert_int 1

authentication {

auth_type PASS

auth_pass 1111

}

virtual_ipaddress {

192.168.10.10

}

}
virtual_server 10.0.0.227 80 {

delay_loop 6

lb_algo rr

lb_kind NAT
persistence_timeout 5
protocol TCP

real_server 192.168.10.4 80 {
    weight 3
    TCP_CHECK {
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}

real_server 192.168.10.5 80 {
    weight 3
    TCP_CHECK {
        connect_timeout 3
        nb_get_retry 3
        delay_before_retry 3
        connect_port 80
    }
}
}

<img src="https://www.52php.cn/res/2019/02-13/10/51e409b11aa51c150090697429a953ed.gif" alt="复制代码">

~]# yum -y install httpd [root@ ~]# cd /var/www/html/ [root@ html]# cat index.html

WEB1/192.168.10.4

、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；

四、测试

####高可用性测试####

上的keepalived服务停掉，然后观察BACKUP上的日志，信息如下

MASTER?上的keepalived服务开启后，BACKUP的日志状态。

####故障切换测试####

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