军哥，遇到这种情况，该怎么防御，附上nginx的日志

bskr

1. 132.232.30.140 - - [07/Mar/2019:20:05:36 +0800] "POST /z.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
   
2. 132.232.30.140 - - [07/Mar/2019:20:05:36 +0800] "POST /7.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
   
3. 132.232.30.140 - - [07/Mar/2019:20:05:37 +0800] "POST /xiaoma.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
   
4. 132.232.30.140 - - [07/Mar/2019:20:05:40 +0800] "POST /xiaomae.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
   
5. 132.232.30.140 - - [07/Mar/2019:20:05:40 +0800] "POST /xiaomar.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
   
6. 132.232.30.140 - - [07/Mar/2019:20:05:40 +0800] "POST /qq.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
   
7. 132.232.30.140 - - [07/Mar/2019:20:05:44 +0800] "POST /data.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
   
8. 132.232.30.140 - - [07/Mar/2019:20:05:48 +0800] "POST /log.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
   
9. 132.232.30.140 - - [07/Mar/2019:20:05:48 +0800] "POST /fack.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
   
10. 132.232.30.140 - - [07/Mar/2019:20:05:51 +0800] "POST /angge.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
    
11. 132.232.30.140 - - [07/Mar/2019:20:05:52 +0800] "POST /cxfm666.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
    
12. 132.232.30.140 - - [07/Mar/2019:20:05:52 +0800] "POST /db.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
    
13. 132.232.30.140 - - [07/Mar/2019:20:05:52 +0800] "POST /hacly.php HTTP/1.1" 503 608 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
    
14. 132.232.30.140 - - [07/Mar/2019:20:05:53 +0800] "POST /xiaomo.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"
    
15. 132.232.30.140 - - [07/Mar/2019:20:05:56 +0800] "POST /xiaoyu.php HTTP/1.1" 404 564 "-" "Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/61.0.3163.91 Safari/537.36"

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上面只是日志的一小部分，持续了有十分钟。然后我网站根本没有这些文件，xiaoyu.php，xiaomo.php，hacly.php。。。等等
请问这是什么情况，该怎么防御，谢谢！！！

licess

没有具体的规律
只能限制访问次数或者安装waf