global_defs {
   router_id r_id
}

vrrp_script chk_myscript {
    script       "/etc/keepalived/chk_available.sh"
    interval 4   # check every 4 seconds
    fall 2       # require 2 failures for KO
    }

vrrp_instance r_id {
    state MASTER
    interface enp0s3
    virtual_router_id 10
    priority 101
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass password
    }
    virtual_ipaddress {
        10.0.25.3/24 dev enp0s3
    }
   track_script {
        chk_myscript
    }
}

#!/bin/sh
ping_test()
{
    ping -c2 8.8.8.8 > /dev/null  #it's just an example ip
    if [ $? -eq 0 ]
    then
          return 0
    else
          return 1
    fi
 }
 ping_return

VRRP sockpool: [ifindex(2), proto(112), unicast(0), fd(10,11)]
ROUTER keepalived_vrrp[2800]: Using LinkWatch kernel netlink reflector...
ROUTER keepalived_vrrp[2801]: VRRP_Instance(INSTANCE) NOW in FAULT state