实践双组KeeAlived

master/slave的单主架构，同一时间只有一个Keepalived对外提供服务，此主机繁忙，而另一台主机却很空闲，利用率低下，可以使用master/master的双主架构，解决此问题。
master/master的双主架构：即将两个或以上VIP分别运行在不同的keepalived服务器，以实现服务器并行提供web访问的目的，提高服务器资源利用率

实现master/master的Keepalivde 双主架构
[root@localhost7A ~]# cat  /etc/keepalived/keepalived.conf 
global_defs {
   notification_email {
     root@localhost   
   }
   notification_email_from root@localhost  
   smtp_server 127.0.0.1  
   smtp_connect_timeout 30
   router_id localhost7A
   vrrp_iptables
   #vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
   vrrp_mcast_group4 224.0.100.100
}
vrrp_instance zzhz {
    state MASTER
    interface eth0
    virtual_router_id 88 
    priority 88        
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass centos 
    }
    virtual_ipaddress {
        192.168.80.222/24 dev eth0 label eth0:1
    }
}
vrrp_instance zjol {
    state BACKUP
    interface eth0
    virtual_router_id 66
    priority 60        
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass centos 
    }
    virtual_ipaddress {
        192.168.80.224/24 dev eth0 label eth0:2  #注意接口编号
    }
}

[root@localhost7B ~]# cat /etc/keepalived/keepalived.conf 
global_defs {
   notification_email {
     root@localhost
   }
   notification_email_from root@localhost
   smtp_server 127.0.0.1
   smtp_connect_timeout 30
   router_id localhost7A
   vrrp_iptables
   #vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
   vrrp_mcast_group4 224.0.100.100
}

vrrp_instance zzhz {
    state BACKUP
    interface eth0
    virtual_router_id 88 
    priority 80
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass centos
    }
    virtual_ipaddress {
        192.168.80.222/24 dev eth0 label eth0:1
    }
}
vrrp_instance zjol {
    state MASTER
    interface eth0
    virtual_router_id 66
    priority 66        
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass centos 
    }
    virtual_ipaddress {
        192.168.80.224/24 dev eth0 label eth0:2
    }
}

　　

实战案例：利用子配置文件实现master/master的Keepalived双主架构
实现独立子配置文件
当生产环境复杂时，/etc/keepalived/keepalived.conf文件中内容过多，不易管理，可以将不同集群的配置，
比如：不同集群的VIP配置放在独立的子配置文件中include /etc/keepalived/conf.d/*.conf

[root@localhost7A ~]# cat /etc/keepalived/keepalived.conf 
global_defs {
   notification_email {
     root@localhost   
   }
   notification_email_from root@localhost  
   smtp_server 127.0.0.1  
   smtp_connect_timeout 30
   router_id localhost7A
   vrrp_iptables
   #vrrp_strict
   vrrp_garp_interval 0
   vrrp_gna_interval 0
   vrrp_mcast_group4 224.0.100.100
}
include /etc/keepalived/conf.d/*.conf #子配置文件


[root@localhost7A ~]# cat /etc/keepalived/conf.d/zzhz.conf 
vrrp_instance zzhz {
    state MASTER
    interface eth0
    virtual_router_id 88
    priority 88
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass centos
    }
    virtual_ipaddress {
        192.168.80.222/24 dev eth0 label eth0:1
    }
}
[root@localhost7A ~]# cat /etc/keepalived/conf.d/zjol.conf 
vrrp_instance zjol {
    state BACKUP
    interface eth0
    virtual_router_id 66
    priority 60
    advert_int 2
    authentication {
        auth_type PASS
        auth_pass centos
    }
    virtual_ipaddress {
        192.168.80.224/24 dev eth0 label eth0:2  #注意这个接口编号，是eth0:2,
    }
}
另外一台KA主机。
[root@localhost7B ~]# tree  /etc/keepalived/
/etc/keepalived/
├── conf.d
│   ├── zjol.conf
│   └── zzhz.conf
└── keepalived.conf

　

实战案例：多个节点的多主架构实现逻辑结构

第一个节点ka1配置：
Vrrp instance 1：MASTER，优先级100
Vrrp instance 2：BACKUP，优先级80
Vrrp instance 3：BACKUP，优先级60

第二个节点ka2配置：
Vrrp instance 1：BACKUP，优先级60
Vrrp instance 2：MASTER，优先级100
Vrrp instance 3：BACKUP，优先级80

第三个节点ka3配置：
Vrrp instance 1：BACKUP，优先级80
Vrrp instance 2：BACKUP，优先级60
Vrrp instance 3：MASTER，优先级100