Double KEEPALIVED+MYSQL Email notification when switching VIP

The basic idea to solve the problem is to send a message reminder when the standby machine is switched to a master.

Specific way:

The following configuration can be configured in the keepalived configuration:

Vrrp_instance Vi_1 {
State MASTER
Interface eth0
virtual_router_id 13
Priority 100
Advert_int 1
Authentication {
Auth_type Pass
Auth_pass 6d02896810d442478799edcc47bcd62c
}
virtual_ipaddress {
x.x.x.x
}
Track_script {
Chk_haproxy
}
notify_master/usr/bin/change_master.sh
}

In this way, the change_master.sh script is executed when the standby is switched to a host. In this script you can write an email notification function. When the host is hung up, the standby machine automatically cut to the master, will perform this function to notify.