Nix configuration

nix, nixpkgs, and nixos are each separate systems and each have their own configuration.
This page documents the nix package manager component.
You may also be interested in nixpkgs configuration.

Documentation

man nix.conf

https://www.mankier.com/5/nix.conf

Locations

~/.config/nix/nix.conf	user config
/etc/nix/nix.conf	global config

Common Options

# /etc/nix.conf

# 
build-users-group = nixbld

#
keep-derivations = true

# 
keep-outputs = true