karantan/cgroup-mover

Simple tool that moves child processes from one cgroup to another

Control Group Mover (cgroup-mover)

cgroup-mover is a simple tool that helps moving processes from one cgroup to a another cgroup.

The idea is to have one cgroup for processes that you want to limit because they consume too much server resources.

Idealy this should be done when a child process is spawn, but this is sometims hard to do (e.g. php-fpm child workers).

That's why we check for child workers every 5 seconds because:

1. We don't want to check too often and cause problems (e.g. file locking)
2. Some processes need a bit more resources at startup (first 1-2 sec) so we try being nice to them.

Usage

$ cgroup-mover --help
Usage of cgroup-mover:
  -new string
    	Cgroup TO which all child processes will be moved
  -user string
      User of which all processes will be moved (e.g. foo_bar)
  -old string
    	Cgroup FROM all child processes will be moved

$ cgroup-mover --old grp1 --new grp2

Nix

Build it with nix by running:

$ nix-build -E "with import <nixpkgs> {}; callPackage ./default.nix {}"

Add it to NixOS:

{ config, pkgs, lib, ... }:
let

  psusage = pkgs.callPackage (import (fetchGit {
    url = "git@github.com:karantan/cgroup-mover";
    ref = "master";
    rev = "<commit>"; # v1.x.y
  })) { };

in {
  environment.systemPackages = [
    cgroup-mover
  ];
}