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I runs a busy website and had an issue with nginx not being able to handle the connection.
This is a snippet of the error:
2024/12/15 19:46:08 [alert] 34526#34526: *129729 socket() failed (24: Too many open files) while connecting to upstream
Solution:
The values being used are according to my preference. You can adjust them according to your requirements.
Step 1 – Edit sysctl.conf
$ sudo nano /etc/sysctl.conf
At the very bottom, paste this text and save
fs.file-max = 70000
Step 2 – Edit limits.conf:
Edit /etc/security/limits.conf
$ sudo nano /etc/security/limits.conf
Add text below at the very bottom
nginx       soft    nofile   10000
nginx       hard    nofile  30000
Step 3 – Edit nginx.conf:
$ sudo nano /etc/nginx/nginx.conf
Add worker_rlimit_nofile and edit worker_connections
worker_rlimit_nofile 30000;
events {
       worker_connections 4096;
       # multi_accept on;
}
Save the file.
Step 4 – Restart nginx:
$ sudo systemctl restart nginx
…and you are done.
Considering donating if you found my post helpful 😊