低版本bug
双主架构中，keepalived日志出现：
more /var/log/message
Oct 9 03:16:22 mysql-dzg-60-148 Keepalived_vrrp[8526]: VRRP_Instance(VI_1) Dropping received VRRP packet...
Oct 9 03:16:23 mysql-dzg-60-148 Keepalived_vrrp[8526]: ip address associated with VRID not present in received packet : 172.28.60.149
Oct 9 03:16:23 mysql-dzg-60-148 Keepalived_vrrp[8526]: one or more VIP associated with VRID mismatch actual MASTER advert
Oct 9 03:16:23 mysql-dzg-60-148 Keepalived_vrrp[8526]: bogus VRRP packet received on bond0 !!!
查看中发现，该平台的Virtual_router_id与其它平台的Virtual_router_id重复。
修改keepalived的 Virtual_router_id值 ，使其唯一，之后重启keepalived：
又出现了两台主库上都有vip的情况，而且通过普通的service keepalived stop,kill pid还不能是VIP消失。
最后通过同时killall掉所有机器上的keepalived之后就好了
出现这个问题的原因应该是mysql主备反复重启诱发keepalived低版本bug
脑裂
主从间网络存在问题，导致keepalive互认为对方已不在工作，导致脑裂