keepalived+lvs子網掩碼造成VIP切換故障 + vrrp_script+track_script

keepalived+lvs子網掩碼造成VIP切換故障
架構：keepalived+lvs ，前端調度器是雙主模型
現象：keepalived手動停掉一台，但是虛擬IP不會切換

整體網絡是24位
VIP：172.18.3.200
keepalived的路由
[root@Sserver3-53 clouder]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.18.3.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.18.0.0      0.0.0.0         255.255.0.0     U     0      0        0 eth0
172.18.3.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0

PS：不fail over 原因就是這條16位的路由作怪
: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> 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  #沒有secondary
       valid_lft forever preferred_lft forever
    inet 172.18.3.201/16 scope global secondary eth0
       valid_lft forever preferred_lft forever

解決，配置檢查：
后端realserver配置的虛擬IP為：
/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
 }
明顯子網掩碼出問題了。
virtual_ipaddress {
      172.18.3.200/24
}


重啟keepalived，檢查現象：
[root@Sserver3-53 clouder]# route -n
Kernel IP routing table
Destination     Gateway         Genmask         Flags Metric Ref    Use Iface
0.0.0.0         172.18.3.1      0.0.0.0         UG    0      0        0 eth0
169.254.0.0     0.0.0.0         255.255.0.0     U     1002   0        0 eth0
172.18.3.0      0.0.0.0         255.255.255.0   U     0      0        0 eth0

eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> 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 forever


15.2    keepalived在centos7.2中的bug
keepalived 在centos7.2 使用 /bin/systemctl restart keepalived.service 配置文件沒有生效
需要使用reload參數來重新生效

 參考：

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

Keepalived詳解（四）：通過vrrp_script實現對集群資源的監控【轉】