Elixir/Docker app takes 2Go of RAM

[Sev78]

Hi,

I work on Elixir Phoenix app with Docker, and I have a lot of Out of Memory crashes.
I check the memory used by my containers and i discovered that my app used too much memory, as below :

The first one is an image test, and the second one is my app.

I’m on a Arch Linux distro, Endeavouros, and my laptop has 8Go of RAM.

Anyone with the same problem and a solution for that ?

[arcanemachine]

I’ve had success with this environment variable in the past (given in Compose format):

services:
  phoenix:
    environment:
      ERL_MAX_PORTS: 1024  # Fixes excessive RAM usage on some systems

Here’s a thread with more info:

Elixir / Erlang docker containers RAM usage on different OS's / Kernels

On my development VM (specs see below) - starting an elixir / erlang container takes up 2G of physical memory while running iex locally only takes up a few MB. I only started an empty container with no modules loaded or code executed. When more containers are started beyond the memory capabilities of the host, running Beam VM’s running in other (running) containers crash for the new instance to start. Image of docker running with htop and system info (dev-vm) observer_cli showing the memory …

[Sev78]

@arcanemachine

ERL_MAX_PORTS

Thank you !
I’ve already checked the OPEN_MAX env var and as the value was 1024, i thought it was ok, but it wasn’t.
I put the ERL_MAX_PORTS env var in my project and it’s ok !