NGINX error 24 and worker_rlimit_nofile

mfigge

• May 02, 2021 21:13

We installed NGINX on cPanel 94 using the command line tool. On a high traffic site (around 1000 concurrent visitors) we got several "24: Too many open files" errors We increased the worker_rlimit_nofile parameter on nginx.conf to 3000 Is that the only change needed? If I check the ulimit, the open files parameter is set to 4096 Thank you!

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  cPRex Jurassic Moderator

  • May 03, 2021 18:09

  Hey there! The Nginx documentation says the following about that value: "Changes the limit on the maximum number of open files (RLIMIT_NOFILE) for worker processes. Used to increase the limit without restarting the main process."

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  mfigge

  • May 03, 2021 18:27

  Thank you for you reply. How can I know if the problem was nginx or ulimit related? I misstyped, right now worker_rlimit_nofile is 30000, and ulimit open files is 4096. I should increase that last one too? I will do some stress test before the next event.

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  mfigge

  • May 03, 2021 18:41

  I realized that ulimits are a per user basis. I checked the file limits.conf has nginx soft nofile 30000 nginx hard nofile 50000 So actually nginx is able to open that quantity of files, right? Sorry, I am newbie with nginx

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  cPRex Jurassic Moderator

  • May 03, 2021 18:55

  I'm new to nginx as well, especially now that it's something we support :D That's specifically what I was looking for - the nginx user limits. As long as that are in place I would expect it to be able to handle that number of files just fine now that you'd made the adjustment.

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