My actions before raising this issue

• Followed the troubleshooting guide
• Read/searched the docs
• Searched past issues

Expected Behaviour

Increase the limit of open files in an openfaas function

Current Behaviour

Limit is stuck at 1024

Are you a GitHub Sponsor (Yes/No?)

No

Check at: https://github.com/sponsors/openfaas

• Yes
• No

List All Possible Solutions and Workarounds

Increasing the Limit on the whole system.
Building the image with higher limits.

Which Solution Do You Recommend?

Set an Enviroment variable in the yaml file to increase open files limit for a function?

Steps to Reproduce (for bugs)

Context

I am trying to run locust tests with openfaas. Locust tests tend to open alot of files while running.

Your Environment

• FaaS-CLI version ( Full output from: faas-cli version ):

CLI:
commit: 72816d486cf76c3089b915dfb0b66b85cf096634
version: 0.13.13

Gateway
uri: http://127.0.0.1:8080
version: 0.21.0
sha: 539f0a2c946ee6096ef2b6ab26f81295eed49d54

Provider
name: faasd
orchestration: containerd
version: 0.13.0
sha: 12ada59

• Docker version docker version (e.g. Docker 17.0.05 ):
  20.10.7
• Are you using OpenFaaS on Kubernetes or faasd?
  faasd
• Operating System and version (e.g. Linux, Windows, MacOS):
  Linux
  No LSB modules are available.
  Distributor ID: Ubuntu
  Description: Ubuntu 20.04.3 LTS
  Release: 20.04
  Codename: focal
• Code example or link to GitHub repo or gist to reproduce problem:
  Here is a simple python flask function example just to check the ulimits:

import subprocess

def handle(req):
	p = subprocess.Popen(req,shell=True, stdout=subprocess.PIPE)
	out, err = p.communicate()
	return "out: " + str(out) + " | err: " + str(err)

when I run it with "ulimit -n 2000" for example, I get an error (not permitted), but when I run it with a number lower than 1024 it works. For example "ulimit -n 100; ulimit -n", output is : 100, and it works. But I want to make the limits higher.

• Other diagnostic information / logs from troubleshooting guide

Next steps

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