#!/bin/bash
    
    CheckURL="http://xx"
    
    STATUS_CODE=`curl -o /dev/null -m 10 –connect-timeout 10 -s -w %{http_code} $CheckURL`
    
    #echo "$CheckURL Status Code:\t$STATUS_CODE"
    
    if [ "$STATUS_CODE" = "502" ]; then

    lnmp php-fpm restart

    fi

保存：

​​502.sh​​

* * * * * sh /www/sh/502.sh >> /www/log/crontab.log 2>1

​