How do I see nginx open file limits on Linux?

Linux
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1

I’m working on a project that involves Nginx working as a reverse proxy server and traffic distribution balancer for 3 virtual machines at EC2. But I hear I need to update sockets and open file limits so that it will not cause any issues. Sometimes traffic will be like 1000 connections per second but the average is 200-300 connections per second. How to see the current nginx open file limits?

2
  1. First find out path to Nginx pid file using the grep command:
grep pid /etc/nginx/nginx.conf
  1. Then using the prlimit command as follows (assuming that /var/run/nginx.pid is the nginx pid file path)
sudo prlimit -p $(</var/run/nginx.pid) | grep 'open'
  1. You can see all details as follows including NOFILE:
sudo prlimit -p $(</var/run/nginx.pid)

Here is outputs:

RESOURCE   DESCRIPTION                             SOFT      HARD UNITS
AS         address space limit                unlimited unlimited bytes
CORE       max core file size                         0 unlimited bytes
CPU        CPU time                           unlimited unlimited seconds
DATA       max data size                      unlimited unlimited bytes
FSIZE      max file size                      unlimited unlimited bytes
LOCKS      max number of file locks held      unlimited unlimited locks
MEMLOCK    max locked-in-memory address space   8388608   8388608 bytes
MSGQUEUE   max bytes in POSIX mqueues            819200    819200 bytes
NICE       max nice prio allowed to raise             0         0 
NOFILE     max number of open files              524288    524288 files
NPROC      max number of processes               256564    256564 processes
RSS        max resident set size              unlimited unlimited bytes
RTPRIO     max real-time priority                     0         0 
RTTIME     timeout for real-time tasks        unlimited unlimited microsecs
SIGPENDING max number of pending signals         256564    256564 signals
STACK      max stack size                       8388608 unlimited bytes
  1. See Nginx 24: Too Many Open Files Error And Solution - nixCraft for more info.
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