Question Change PHP-FPM settings

[KZM]

Hi there!

I'm tuning my Apache server bc of it is continuously being rebooted due to timeouts.

As I'm using PHP handler FPM I have found some settings I can tweak (I've already upgraded my VPS to 16 GM memory)
File: ../mods-available/mpm_prefork.conf

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<IfModule mpm_prefork_module> StartServers 4 MinSpareServers 20 MaxSpareServers 40 MaxRequestWorkers 200 MaxConnectionsPerChild 4500 </IfModule> But also in Plesk UI I noticed these same settings can be tweaked. So the questions is WHERE do I make these tweaks?

 

[Maarten.]

https://support.plesk.com/hc/en-us/articles/214529205-Apache-keeps-going-down-on-a-Plesk-server-server-reached-MaxRequestWorkers-setting

 

[KZM]

https://support.plesk.com/hc/en-us/articles/214529205-Apache-keeps-going-down-on-a-Plesk-server-server-reached-MaxRequestWorkers-setting

Thanks for sharing this url. I'm already aware of it but I'm afraid it does not answer my question.

 

[KZM]

I am referring to these same settings in Plesk UI

Screenshot

Captured with Lightshot

prnt.sc

 

[Maarten.]

These values can be set in the Service Plan section, if that's what you mean:

https://support.plesk.com/hc/en-us/articles/115001201949-How-to-apply-PHP-FPM-pool-settings-for-all-domains-in-Plesk-

 

[KZM]

These values can be set in the Service Plan section, if that's what you mean:

https://support.plesk.com/hc/en-us/articles/115001201949-How-to-apply-PHP-FPM-pool-settings-for-all-domains-in-Plesk-

sure @maartenv but the question is what's the difference between adding those in Plesk or directly in ../mods-available/mpm_prefork.conf

 

[Bitpalast]

@KZM You're confusing two different things. The one in your first post refers to web server settings, the other one you refer to in your PHP-FPM sreenshot refers to PHP settings. For most scenarios the PHP-FPM setting "on demand" is a good choice. If the "max_children" value is too small, it is possible that additional requests cannot be processed until a previous request has finished processing. This however will be logged in your error_log, so you should get a clear message like "max_children reached". A web server with max_request works = 200 should definitely be able to handle all. Having 20 server instances "ready to go" is also enough for most cases. So probably you're exceeding the PHP-FPM settings. Try a larger numbre of max_children, e.g 50, and a high number of max_requests, e.g. 10000.

 

[KZM]

@KZM You're confusing two different things. The one in your first post refers to web server settings, the other one you refer to in your PHP-FPM sreenshot refers to PHP settings. For most scenarios the PHP-FPM setting "on demand" is a good choice. If the "max_children" value is too small, it is possible that additional requests cannot be processed until a previous request has finished processing. This however will be logged in your error_log, so you should get a clear message like "max_children reached". A web server with max_request works = 200 should definitely be able to handle all. Having 20 server instances "ready to go" is also enough for most cases. So probably you're exceeding the PHP-FPM settings. Try a larger numbre of max_children, e.g 50, and a high number of max_requests, e.g. 10000.

Thanks! but do those 2 affect each other?