[root@ip-192-168-1-153:~]# cat nix.conf
# WARNING: this file is generated from the nix.* options in
# your NixOS configuration, typically
# /etc/nixos/configuration.nix.  Do not edit it!
build-users-group = nixbld
max-jobs = 32
cores = 8
sandbox = true
extra-sandbox-paths =
substituters = https://nix-cache.s3.amazonaws.com https://kreisys.cachix.org
trusted-substituters =
trusted-public-keys = kreisys.cachix.org-1:RMqfdpzxeRcoND7pD5l0EcFfjEIYBbOR5WF2CQyxPyE= cache.nixos.org-1:6NCHdD59X431o0gWypbMrAURkbJ16ZPMQFGspcDShjY=
auto-optimise-store = false
require-sigs = true

trusted-users = hydra-queue-runner
allowed-users = *

secret-key-files = /var/keys/hydra
allowed-uris = https://github.com/ https://registry.npmjs.org/

gc-keep-outputs = true
gc-keep-derivations = true

# The default (`true') slows Nix down a lot since the build farm
# has so many GC roots.
gc-check-reachability = false


[root@ip-192-168-1-153:~]# nix-channel --list
warning: unknown setting 'allowed-uris'
nixos http://nixos.org/channels/nixos-18.09
nixos-unstable http://nixos.org/channels/nixos-unstable

[root@ip-192-168-1-153:~]# nix-shell -p nix-info --run nix-info
system: "x86_64-linux", multi-user?: yes, version: nix-env (Nix) 2.1.1, channels(root): "nixos-18.09.892.c06f5302f63, nixos-unstable-19.03pre155123.32bcd72bf28", nixpkgs: /nix/var/nix/profiles/per-user/root/channels/nixos