keepalived+lvs子网掩码造成VIP切换故障架构：keepalived+lvs ，前端调度器是双主模型现象：keepalived手动停掉一台，但是虚拟IP不会切换整体网络是24位VIP：172.18.3.200keepalived的路由[root@Sserver3-53 clouder]# route -nKernel IP routing tableDestination     Gateway         Genmask         Flags Metric Ref    Use Iface0.0.0.0         172.18.3.1      0.0.0.0         UG    0      0        0 eth0169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0172.18.0.0      0.0.0.0         255.255.0.0     U     0      0        0 eth0172.18.3.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0PS：不fail over 原因就是这条16位的路由作怪: eth0: 
     
       mtu 1500 qdisc pfifo_fast state UP qlen 1000    link/ether 06:cf:56:00:01:3b brd ff:ff:ff:ff:ff:ff    inet 172.18.3.53/24 brd 172.18.3.255 scope global eth0       valid_lft forever preferred_lft forever    inet 172.18.3.200/16 scope global eth0  #没有secondary       valid_lft forever preferred_lft forever    inet 172.18.3.201/16 scope global secondary eth0       valid_lft forever preferred_lft forever解决，配置检查：后端realserver配置的虚拟IP为：/sbin/ifconfig lo:0 172.18.3.200 broadcast 172.18.3.200 netmask 255.255.255.255 up/sbin/route add -host 172.18.3.200 dev lo:0前端keepalived：virtual_ipaddress {      172.18.3.200/16 }明显子网掩码出问题了。virtual_ipaddress {      172.18.3.200/24}重启keepalived，检查现象：[root@Sserver3-53 clouder]# route -nKernel IP routing tableDestination     Gateway         Genmask         Flags Metric Ref    Use Iface0.0.0.0         172.18.3.1      0.0.0.0         UG    0      0        0 eth0169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0172.18.3.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0eth0: 
      
        mtu 1500 qdisc pfifo_fast state UP qlen 1000    link/ether 06:cf:56:00:01:3b brd ff:ff:ff:ff:ff:ff    inet 172.18.3.53/24 brd 172.18.3.255 scope global eth0       valid_lft forever preferred_lft forever    inet 172.18.3.200/24 scope global secondary eth0       valid_lft forever preferred_lft forever15.2    keepalived在centos7.2中的bugkeepalived 在centos7.2 使用 /bin/systemctl restart keepalived.service 配置文件没有生效需要使用reload参数来重新生效
      
     

 参考：

https://www.cnblogs.com/paul8339/p/9644821.html