问题描述：开通主从实例后，在两台实例机器上输入ip a，都能看到vip在网卡上

检查问题：检查机器网络是否互通，检查vip是否是通的，看keepalived配置文件是单播还是组播的方式，检查发现网络是通的，配置文件为组播配置。

解决办法：如果是组播，可能是因为机器不支持组播方式导致脑裂，需要把keepalived配置文件改为单播方式，若是改了之后还不行，则可能是防火墙有限制vrrp的传输。

查看原配置文件发现为组播方式:

cat keepalived_3002_3001.conf.bak

! Configuration File for keepalived

 

global_defs {

   router_id GW11

}

 

vrrp_script chkgw3001 {

   script "/app/mysql/bin/inst_619410329666205780/teledb_619410329666205780/gateway_3000/gateway_3001_3002/chkgw3001.sh"

   interval 10

   weight -20

}

 

vrrp_instance VI_3001 {

    state BACKUP

    interface  eth0

    virtual_router_id 3

    priority 90

    advert_int 1

 

    authentication {

        auth_type PASS

        auth_pass 1111

    }

 

    virtual_ipaddress {

       VIP dev eth0 label eth0:3   #vip输入填写vipip

    }

 

    track_script {

        chkgw3001

    }

}

 

改为单播方式：

cat keepalived_3002_3001.conf

! Configuration File for keepalived

 

global_defs {

   router_id GW11

}

 

vrrp_script chkgw3001 {

   script "/app/mysql/bin/inst_619410329666205780/teledb_619410329666205780/gateway_3000/gateway_3001_3002/chkgw3001.sh"

   interval 10

   weight -20

}

 

vrrp_instance VI_3001 {

    state BACKUP

    interface  eth0

    virtual_router_id 3

    priority 90

    advert_int 1

 

    authentication {

        auth_type PASS

        auth_pass 1111

    }

 

    unicast_src_ip 本机ip   #源ip,本机IP

    unicast_peer {

      目标ip                 #目标IP，备节点IP，有多少备节点就填多少个IP

    }

    virtual_ipaddress {

       vip dev eth0 label eth0:3     #vip，填写vip

    }

 

    track_script {

        chkgw3001

    }

}

 

从库机器keepalived配置文件修改同上

 

Keepalived配置文件修改完成后，重启keepalived，sudo systemctl restart keepalived，vip就正常了。