How Nginx Ingress calculates the worker_processes and worker_rlimit_nofile

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How Nginx Ingress calculates the worker_processes and worker_rlimit_nofile


About the parameters;


This parameter determines the number of Nginx worker processes to spawn during startup.


This parameter controls the open file limit per worker process.

More details can be found on Nginx documentation

Both worker_processes and worker_rlimit_nofile are calculated dynamically by Nginx Ingress during startup.

Based on the source code of Ingress Nginx;

worker_processes = Number of CPUs ($ grep -c processor /proc/cpuinfo)
worker_rlimit_nofile = ( RLIMIT_NOFILE / worker_processes ) - 1024  

where RLIMIT_NOFILE is the maximum allowed open files by the process ( ulimit -n )

From Nginx Ingress shell, you can verify the same.

# kubectl exec -it  -n ingress-nginx nginx-ingress-controller-8ln2b -- bash
bash-5.0$ ulimit -n
bash-5.0$ grep -c processor /proc/cpuinfo
2        <<---- worker_processes
bash-5.0$ echo $(((1048576/2)-1024))
523264    <<--- worker_rlimit_nofile
bash-5.0$ egrep "worker_processes|worker_rlimit_nofile" /etc/nginx/nginx.conf
worker_processes 2;
worker_rlimit_nofile 523264;


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  • Document ID:000020079
  • Creation Date: 06-May-2021
  • Modified Date:06-May-2021
    • SUSE Rancher

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