Why is My Webserver Hanging?!? (Spoiler: It was PHP-FPM)

My webserver randomly hangs, kicking my websites offline. After some investigating, it turned out to be PHP-FPM, and its default settings. With multiple PHP websites, the 5 default children get used up quickly!

If you'd like to see more videos about my favorite webserver (Caddyserver), let me know in the comments!

NOTE: I know this video wasn't actually about my webserver at all... but the question still stands, lol!

#linux #php #caddyserver

[grillonbleu]

Very useful info for anyone running PHP-FPM, whatever the web server may be. We’re running it through Apache2 and this is setting us on the right track. Thanks!

[rupeshshrestha]

Hey great stuff we would love to see Caddyserver videos. thanks for your informative video

[B.A.D.O.]

Thank you so much. I spent way too many hours that I am ashamed to disclose and tried all sorts of configs with magic calculations from the net. The tool you shared and the steps to calculate size and processes was just what I needed

[maicon]

Thank you for the content! You helped me a lot with a challenge that only who maintain a big traffic website will face of, awesome. Greetings from Brazil 🤘

[neorejdv]

Hey Shawn good video love these real life examples and troubleshooting.

[DigitalMetal]

Thanks for this info.
I just want to say, I'm running a few websites of my VPS from Vultr. I'm running Apache, with PHP, and MySQL, and my entire VM only has 1GB of RAM and 1GB of SWAP.
If you have 12GB or RAM and you're having issues, I don't think the issue is needing more RAM.

[nunochaves]

You should use a fixed number of child processes in a production server. Killing and respawning processes has a performance hit. Should also have a max requests set to respawn to preventemory leaks

[yayow_p]

Great stuff, would love to see more caddy material perhaps setting it up from scratch?

[komismo]

i checked my fpm conf its default to 50 child-process. Do I still need to adjust them?

[wangchukdorji]

I have multiple php running should the the numbers be remain same for all the php-fpms.

[DomingosVarela]

Hi,

thanks for sharing.
my new settings based in aval ram;

pm.max_children = 201
pm.start_servers = 50
pm.min_spare_servers = 50
pm.max_spare_servers = 150
pm.max_request = 2000

After changed i have the same error, i thing the values are not set! I already restarted the php and server too.
The message shows the old value pm.max_children setting (5)!

WARNING: [pool librenms] server reached pm.max_children setting (5), consider raising it

What else do I need to do?
Thanks

[CaseyCarnnia]

++ caddy v Apache ; and thank you.

and this spesefic video totally relates to my past 4 hours.

[leeterthanyou]

php-fpm is a lovely thing. I once wrote a 3-page document for work detailing how you can `kill -USR2` an fpm poolrunner's PID to cause it to be like "yo shit ain't right" and reload that pool's config.

[JeffreyLopez-mk]

Lopez Margaret Rodriguez Donna White Mark