keepalived 单独配置文件 

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! Configuration File for keepalived
global_defs {
   notification_email {
      lihuiyw@jd.com   
}
   notification_email_from lihuiyw@jd.com
   smtp_server mail.jd.com
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}
vrrp_script check_alive
{
        script "/export/sh/check_nginx_alive.sh"
        # check every 2 seconds
        interval 2
        # if failed, decrease 10 of the priority
        weight -10
        # require 2 failures for failures
        fail 2
        # require 1 sucesses for ok
        rise 1
}
vrrp_instance VIP_${routerid}
{
	state $role
	interface $interface
	virtual_router_id $routerid
	priority $weight
	advert_int 2 
	garp_master_delay 10
	smtp_alert
	authentication
	{
		auth_type PASS 
		auth_pass 123456
	}
	virtual_ipaddress
	{ 
		${vip}/24
	}
	track_interface 
	{
		$interface
	} 
	track_script
	{ 
		check_alive 
	}
}