Keepalived-出现双ip问题

Keepalived-出现双ip问题

问题

可能是上联交换机禁用了arp的广播限制，造成keepalive无法通过广播通信，两台服务器抢占vip，出现同时都有vip的情况

解决过程

## 主机，发现向224.0.0.18发送消息
tcpdump -i eth0 vrrp -n

## 备机，也在向224.0.0.18发送消息，正常情况下，备节点如果收到主节点的心跳消息时，优先级高于自己，就不会主动对外发送消息
tcpdump -i eth0 vrrp -n

## 原因：上联交换机禁用了arp的广播限制，造成keepalive无法通过广播通信，两台服务器抢占vip，出现同时都有vip的情况

## 解决办法：多播改为单播，重启keepalived

主机配置

! Configuration File for keepalived

global_defs {
  router_id NGINX
   }

vrrp_instance VI_1 {
    state MASTER
    interface eth0
    virtual_router_id 17
#多播    mcast_src_ip 10.77.114.150
    unicast_src_ip 10.77.114.150
    unicast_peer {
    10.77.114.151 #指向对方主机IP 如果有多个keepalived,再下面加其它节点的IP
    }
    priority 150
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass hykj
    }
    virtual_ipaddress {
        10.77.114.130
    }
}

备机配置

! Configuration File for keepalived

global_defs {
   router_id NGINX
   }

vrrp_instance VI_1 {
    state BACKUP
    interface eth0
    virtual_router_id 17
#多播    mcast_src_ip 10.77.114.151
    unicast_src_ip 10.77.114.151
    unicast_peer {
        10.77.114.150
    }
    priority 99
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass hykj
    }
    virtual_ipaddress {
        10.77.114.130
      }
}

keepalived 安装

yum install -y keepalived