//此时没有报警信息

模拟脑裂
更改master主机keepalived配置文件，将virtual_router_id进行更改，与backup里面不一样就可以
master

[root@master ~]# vim /etc/keepalived/keepalived.conf
virtual_router_id 55    //我这里是将51改为了55
[root@master ~]# systemctl restart keepalived.service 
//重启keepalived
[root@master ~]# ip a    //发现VIP还在
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:f6:83:57 brd ff:ff:ff:ff:ff:ff
    inet 192.168.222.138/24 brd 192.168.222.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.222.133/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fef6:8357/64 scope link 
       valid_lft forever preferred_lft forever
3: virbr0: <NO-CARRIER,BROADCAST,MULTICAST,UP> mtu 1500 qdisc noqueue state DOWN group default qlen 1000
    link/ether 52:54:00:db:51:2f brd ff:ff:ff:ff:ff:ff
    inet 192.168.122.1/24 brd 192.168.122.255 scope global virbr0
       valid_lft forever preferred_lft forever
4: virbr0-nic: <BROADCAST,MULTICAST> mtu 1500 qdisc fq_codel master virbr0 state DOWN group default qlen 1000
    link/ether 52:54:00:db:51:2f brd ff:ff:ff:ff:ff:ff
[root@master ~]# ss -antl    //nginx也在
State      Recv-Q     Send-Q          Local Address:Port           Peer Address:Port     Process     
LISTEN     0          128                   0.0.0.0:111                 0.0.0.0:*                    
LISTEN     0          128                   0.0.0.0:80                  0.0.0.0:*                    
LISTEN     0          32              192.168.122.1:53                  0.0.0.0:*                    
LISTEN     0          128                   0.0.0.0:22                  0.0.0.0:*                    
LISTEN     0          128                      [::]:111                    [::]:*                    
LISTEN     0          128                      [::]:80                     [::]:*                    
LISTEN     0          128                      [::]:22                     [::]:*                  

backup

[root@backup ~]# ip a   //发现也有VIP
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN group default qlen 1000
    link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
    inet 127.0.0.1/8 scope host lo
       valid_lft forever preferred_lft forever
    inet6 ::1/128 scope host 
       valid_lft forever preferred_lft forever
2: ens33: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc fq_codel state UP group default qlen 1000
    link/ether 00:0c:29:31:af:f9 brd ff:ff:ff:ff:ff:ff
    inet 192.168.222.139/24 brd 192.168.222.255 scope global noprefixroute ens33
       valid_lft forever preferred_lft forever
    inet 192.168.222.133/32 scope global ens33
       valid_lft forever preferred_lft forever
    inet6 fe80::20c:29ff:fe31:aff9/64 scope link 
       valid_lft forever preferred_lft forever
[root@backup ~]# ss -antl   //nginx也在
State      Recv-Q     Send-Q         Local Address:Port            Peer Address:Port     Process     
LISTEN     0          128                  0.0.0.0:22                   0.0.0.0:*                    
LISTEN     0          128                  0.0.0.0:10050                0.0.0.0:*                    
LISTEN     0          128                  0.0.0.0:80                   0.0.0.0:*                    
LISTEN     0          128                     [::]:22                      [::]:*                    
LISTEN     0          128                     [::]:80                      [::]:*                   

出现了报警信息