Issue Apache loading files randomly

[green3d]

Good day, what can be caused by Apache loading files randomly? I am posting the logs below. The problem has recently appeared on new pages, and the browser is displaying the message "No input file specified."
2023-10-24 18:08:01 Error 194.33.77.249 404 GET /php2.php HTTP/1.0 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0 1.49 K Apache access 2023-10-24 18:08:02 Error 194.33.77.249 404 GET /php2.php HTTP/1.0 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0 1.49 K Apache access 2023-10-24 18:08:03 Error 194.33.77.249 404 GET /php2.php HTTP/1.0 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0 1.49 K Apache access 2023-10-24 18:08:13 Access 194.33.77.249 200 GET /php2.php HTTP/1.0 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0 32.4 K Apache access 2023-10-24 18:08:14 Error 194.33.77.249 404 GET /php2.php HTTP/1.0 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0 1.49 K Apache access 2023-10-24 18:08:16 Access 194.33.77.249 200 GET /php2.php HTTP/1.0 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0 32.4 K Apache access 2023-10-24 18:08:17 Access 194.33.77.249 200 GET /php2.php HTTP/1.0 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0 28.3 K Apache access 2023-10-24 18:08:18 Access 194.33.77.249 200 GET /php2.php HTTP/1.0 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0 28.3 K Apache access 2023-10-24 18:08:19 Error 194.33.77.249 404 GET /php2.php HTTP/1.0 Mozilla/5.0 (Windows NT 10.0; Win64; x64; rv:109.0) Gecko/20100101 Firefox/118.0 5.62 K Apache access

 

[Peter Debik]

In your example, Apache loads the same file php2.php (and fails as that does not exist). Could you please provide a more accurate description what you mean by "random"? Exact steps to reproduce would help to understand this better.

 

[green3d]

As you can see in the logs I reload this page in the browser and sometimes it does not load which manifests itself in the browser with the message "No input file specified." The same thing happens when I load a simple text file such as test.txt. However, if I force Ngnix to load this text file in the Plesk settings, it loads every time. Could this be due to some limits? There are more than 1700 domains on this server.

 

[green3d]

2023-10-26 09:47:01	Access	x.x.x.x	304	GET /test.txt HTTP/1.0			297	Apache access
2023-10-26 09:47:03	Access	x.x.x.x	304	GET /test.txt HTTP/1.0			4.42 K	Apache access
2023-10-26 09:47:03	Error	x.x.x.x	404	GET /test.txt HTTP/1.0			4.54 K	Apache access
2023-10-26 09:47:05	Error	x.x.x.x	404	GET /test.txt HTTP/1.0			425	Apache access
2023-10-26 09:47:05	Access	x.x.x.x	200	GET /test.txt HTTP/1.0			492	Apache access

 

[Peter Debik]

- Are you using Nginx "Proxy mode", so that Apache always delivers the file (should always deliver it)?
- Do you have enough disk space an inodes on the server?
- Is this a dedicated server or a virtual server?
- Do you have a physical file system or is the file system provided by the virtualization?

 

[green3d]

- Are you using Nginx "Proxy mode", so that Apache always delivers the file (should always deliver it)?
- Do you have enough disk space an inodes on the server?
- Is this a dedicated server or a virtual server?
- Do you have a physical file system or is the file system provided by the virtualization?

- Yes
- There is over 2TB of disk space free.
- Dedicated server.
- Physical file system

 

[green3d]

"Web server Configuration Checker" reports the following warning

Checking for nginx ULIMIT value

  1763 domains have been found on server. Problem with nginx default
  limit for open files is possible.
  Please check https://support.plesk.com/hc/articles/213938485 for
  details ........................................................... [WARNING]

On my server it looks like this:

grep 'Max open files' /proc/$(cat /var/run/nginx.pid)/limits
Max open files            131072               131072               files

I don't understand where this warning from Plesk comes from

 

[Peter Debik]

The number of allowed file handles can indeed cause problems. However, it is not enough to just set a high maximum in Nginx. You also need to tell the system about it and maybe other services like Apache.

 

[green3d]

What settings do you suggest to change, and what are your recommendations is such a number of domains?