keepalived的备节点VRRP_Script执行异常，求大神帮忙

[时光瞄]

现在是两台接入服务器，上面分别安装了nginx和keepalived
现在VIP的漂移功能正常，然后主节点的VRRP_Script执行正常，但是备节点的VRRP_Script执行提示超时。
先贴keepalived配置（两个节点的配置基本完全一样，除了优先级主节点是100，备节点是99）：

! Configuration File for keepalived

global_defs {
   notification_email {
     [e-mail]
     [e-mail]
     [e-mail]
   }
   notification_email_from [e-mail]
   smtp_server 192.168.200.1
   smtp_connect_timeout 30
   router_id LVS_DEVEL
}

vrrp_script chk_http_port {   
        script "/opt/chk_nginx.sh"
        interval 2
        weight 2
   }

vrrp_instance VI_1 {
    state MASTER
    interface eno16777984
    virtual_router_id 51
    priority 100
    advert_int 1
    authentication {
        auth_type PASS
        auth_pass 1111
    }
    virtual_ipaddress {
        172.20.200.45
    }
    track_script {
        chk_http_port
    }
}

在贴脚本/opt/chk_nginx.sh

#!/bin/sh
# check nginx server status
NGINX=/usr/local/nginx/sbin/nginx
PORT=80

nmap localhost -p $PORT | grep "$PORT/tcp open"
#echo $?
if [ $? -ne 0 ];then
    $NGINX -s stop
    $NGINX
    sleep 3
    nmap localhost -p $PORT | grep "$PORT/tcp open"
    [ $? -ne 0 ] && service keepalived stop
fi

我做了如下验证
如果我停掉主节点的nginx，然后主节点的keepalived日志输出：
Aug 4 17:01:56 svr-ekp12lb1 Keepalived_vrrp[1029]: VRRP_Script(chk_http_port) succeeded
如果我停掉备节点的nginx，然后备节点的keepalived日志输出：
Aug 4 17:03:27 svr-ekp12lb2 Keepalived_vrrp[6916]: VRRP_Script(chk_http_port) timed out
Aug 4 17:03:27 svr-ekp12lb2 Keepalived_vrrp[6916]: Process [9177] didn't respond to SIGTER

困扰我一天了，有什么不清楚的地方可以提出来，我会在跟帖中补充，感谢大神来帮忙！

[时光瞄]

没人帮忙分析一下嘛

[时光瞄]

手工置顶！

[时光瞄]

来人顶！d=====(￣▽￣*)b顶顶顶！

[cqyy725]

靠，你备份节点都停止了，备份节点上执行nginx的脚本肯定要报错呀

[xsyl1124]

fall 3

[xsyl1124]

vrrp_script chk_http_port { script "/opt/chk_nginx.sh" interval 2 weight 2 fall 3 } 你的脚本执行超时了 增加一行参数 fall 3 多试几次

[wjw870907]

为什么会超时呢，我一个简单的进程检查也会超时？