前言：

一般这种模式不需要相对复杂的配置，相对单网络单主模式，多了一个主可用模式。主要实现单网络双主故障漂移模式。

1.架构示意图：

多播IP是：224.0.0.111。
NAT网络可根据自己的实际情况配置。

                        +------+
			|Client|
			+------+
                           /\
		       +--------+   
                       |Internet|
		       +--------+
                           /\
		       +--------+  
                       |NAT 网络|
		       +--------+
                           /\
	        +-----------------------+	 
                | 公网VIP1:172.16.8.100 |
		| 公网VIP2:172.16.8.101 |
		+-----------------------+
                   /                \
+-----------------------+      +-----------------------+
| KA+Lvs/Nginx/HAProxy  |      | KA+Lvs/Nginx/HAProxy  |
|                       |<---->|                       |
| VIP1:Master    (eth1) |多播IP| VIP1:BACKUP    (eth1) |
| VIP2:BACKUP    (eth1) |<---->| VIP2:Master    (eth1) |
| IP1:172.16.8.10(eth1) |      | IP1:172.16.8.11(eth1) |
+-----------------------+      +-----------------------+
                   \                /
	        +-----------------------+	 
                | 公网VIP1:172.16.8.100 |
		| 公网VIP2:172.16.8.101 |
		+-----------------------+
			   \/
			+------+
			|资源池|
			+------+

2.ka67配置文件：

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka67
   vrrp_mcast_group4 224.0.0.111
}
vrrp_instance VG_1 {
    state MASTER
    interface eth0
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass renwole0
    }
    virtual_ipaddress {
        172.16.8.100
    }
    notify_master "/usr/local/keepalived/etc/keepalived/notify.sh master"
    notify_backup "/usr/local/keepalived/etc/keepalived/notify.sh backup"
    notify_fault "/usr/local/keepalived/etc/keepalived/notify.sh fault"          
}
vrrp_instance VG_2 {
    state BACKUP
    interface eth0
    virtual_router_id 192
    priority 95
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass renwole1
    }
    virtual_ipaddress {
        172.16.8.101
    }
    notify_master "/usr/local/keepalived/etc/keepalived/notify.sh master"
    notify_backup "/usr/local/keepalived/etc/keepalived/notify.sh backup"
    notify_fault "/usr/local/keepalived/etc/keepalived/notify.sh fault"          
}

3.ka68配置文件：

global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from ka@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id ka68
   vrrp_mcast_group4 224.0.0.111
}
vrrp_instance VG_1 {
    state BACKUP
    interface eth0
    virtual_router_id 191
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass renwole0
    }
    virtual_ipaddress {
        172.16.8.100
    }
    notify_master "/usr/local/keepalived/etc/keepalived/notify.sh master"
    notify_backup "/usr/local/keepalived/etc/keepalived/notify.sh backup"
    notify_fault "/usr/local/keepalived/etc/keepalived/notify.sh fault"  
}
vrrp_instance VG_2 {
    state MASTER
    interface eth0
    virtual_router_id 192
    priority 95
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass renwole1
    }
    virtual_ipaddress {
        172.16.8.101
    }
    notify_master "/usr/local/keepalived/etc/keepalived/notify.sh master"
    notify_backup "/usr/local/keepalived/etc/keepalived/notify.sh backup"
    notify_fault "/usr/local/keepalived/etc/keepalived/notify.sh fault"
}