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Gabriel Simmer 2023-07-25 19:46:10 +01:00
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#+title: NixOS System Configurations
#+PROPERTY: header-args :mkdirp yes
* Systems
I have opted to use NixOS for my systems moving forward. You can read a bit more
about this move [[https://blog.gabrielsimmer.com/posts/from-guix-to-nixos][here]]. I haven't dabbled with custom configuration too much so
this is pretty close to the default configuration.
** London
London is my primary desktop.
Be sure to import the hardware configuration the Nix installer generates.
#+begin_src nix :tangle nix/configuration.nix
# Tangled in ../Systems.org
{ config, pkgs, ... }:
{
imports =
[
./hardware-configuration.nix
];
#+end_src
Bootloader is GRUB so I can dual boot Windows. =enableCryptodisk= is annoying but apparently neccesary.
#+begin_src nix :tangle nix/configuration.nix
boot.loader.grub = {
enable = true;
version = 2;
device = "nodev";
useOSProber = true;
efiSupport = true;
enableCryptodisk = true;
canTouchEfiVariables = true;
efiSysMountPoint = "/boot/efi";
};
#+end_src
Basic system stuff that I won't really touch by hand. Importantly, enabled nix flakes.
#+begin_src nix :tangle nix/configuration.nix
boot.binfmt.emulatedSystems = [ "aarch64-linux" ];
boot.kernelPackages = pkgs.linuxPackages_6_0;
# Setup keyfile
boot.initrd.secrets = {
"/crypto_keyfile.bin" = null;
};
# Enable swap on luks
boot.initrd.luks.devices."luks-63100442-37df-4579-a787-cb2f2c67b3d1".device = "/dev/disk/by-uuid/63100442-37df-4579-a787-cb2f2c67b3d1";
boot.initrd.luks.devices."luks-63100442-37df-4579-a787-cb2f2c67b3d1".keyFile = "/crypto_keyfile.bin";
nix.settings.experimental-features = [ "nix-command" "flakes" ];
time.timeZone = "Europe/London";
i18n.defaultLocale = "en_GB.utf8";
#+end_src
Networking stuff. I use Tailscale as a mesh VPN, and Mullvad for "privacy".
#+begin_src nix :tangle nix/configuration.nix
networking.hostName = "LONDON"; # Define your hostname.
# Enable networking
networking.networkmanager.enable = true;
systemd.services.NetworkManager-wait-online.enable = false;
networking.firewall.checkReversePath = "loose";
networking.firewall.allowedTCPPorts = [ 3389 ]; # for RDP
services.mullvad-vpn.enable = true;
services.tailscale.enable = true;
#+end_src
Next, X11! I haven't quite made the switch to Wayland. Theoretically Plasma supports it but it doesn't seem to want to work. Long term I want to run Sway on an ultrawide. I also enable RDP in case I need to remote back into my desktop (if I can't use SSH for whatever reason). Also enable the nvidia drivers here.
#+begin_src nix :tangle nix/configuration.nix
# Enable the X11 windowing system.
services.xserver.enable = true;
# Enable the KDE Plasma Desktop Environment.
services.xserver.displayManager.sddm.enable = true;
services.xserver.desktopManager.plasma5.enable = true;
services.xrdp.enable = true;
services.xrdp.defaultWindowManager = "startplasma-x11";
# Configure keymap in X11
services.xserver = {
layout = "us";
xkbVariant = "";
};
# Allow unfree packages
nixpkgs.config.allowUnfree = true;
services.xserver.videoDrivers = [ "nvidia" ];
hardware.opengl.enable = true;
#+end_src
Basic user setup. I use home-manager for my profile applications so just give me vim and that's it (I actually use emacs, but it doesn't hurt to have a fallback).
#+begin_src nix :tangle nix/configuration.nix
programs.zsh.enable = true;
environment.shells = with pkgs; [ zsh ];
users.users.gsimmer = {
shell = pkgs.zsh;
isNormalUser = true;
description = "Gabriel Simmer";
extraGroups = [ "networkmanager" "wheel" ];
packages = with pkgs; [ vim ];
};
#+end_src
Misc. utilities. Printing, sound, Docker, Steam, fonts. Why is Steam installed at a system level? I don't know. I think I got confused. This will be move to home-manager at some point.
#+begin_src nix :tangle nix/configuration.nix
environment.systemPackages = with pkgs; [
os-prober
tailscale
cifs-utils
pinentry-curses
];
# Enable CUPS to print documents.
services.printing.enable = true;
# Enable sound with pipewire.
sound.enable = true;
hardware.pulseaudio.enable = false;
security.rtkit.enable = true;
services.pipewire = {
enable = true;
alsa.enable = true;
alsa.support32Bit = true;
pulse.enable = true;
# If you want to use JACK applications, uncomment this
#jack.enable = true;
};
virtualisation = {
docker = {
enable = true;
rootless = {
enable = true;
setSocketVariable = true;
};
};
};
programs.dconf.enable = true;
programs.steam = {
enable = true;
remotePlay.openFirewall = true;
dedicatedServer.openFirewall = false;
};
fonts.fonts = with pkgs; [
ibm-plex
jetbrains-mono
];
services.yubikey-agent.enable = true;
services.pcscd.enable = true;
# Some programs need SUID wrappers, can be configured further or are
# started in user sessions.
# programs.mtr.enable = true;
programs.gnupg.agent = {
enable = true;
pinentryFlavor = "curses";
enableSSHSupport = true;
};
system.stateVersion = "22.05";
}
#+end_src
Hardware configuration generated by the NixOS installer.
#+begin_src nix :tangle nix/hardware-configuration.nix
# Do not modify this file! It was generated by ‘nixos-generate-config’
# and may be overwritten by future invocations. Please make changes
# to /etc/nixos/configuration.nix instead.
{ config, lib, pkgs, modulesPath, ... }:
{
imports =
[ (modulesPath + "/installer/scan/not-detected.nix")
];
boot.initrd.availableKernelModules = [ "nvme" "xhci_pci" "ahci" "usb_storage" "usbhid" "sd_mod" ];
boot.initrd.kernelModules = [ ];
boot.kernelModules = [ "kvm-amd" ];
boot.extraModulePackages = [ ];
fileSystems."/" =
{ device = "/dev/disk/by-uuid/cd6f3e34-65ce-4be5-b4d4-6818e70dcff3";
fsType = "ext4";
};
boot.initrd.luks.devices."luks-0cd5d85e-e232-4f75-a8b3-087737657fef".device = "/dev/disk/by-uuid/0cd5d85e-e232-4f75-a8b3-087737657fef";
fileSystems."/boot/efi" =
{ device = "/dev/disk/by-uuid/AB23-FA19";
fsType = "vfat";
};
fileSystems."/home/gsimmer/FHG" = {
device = "/dev/disk/by-label/FHG";
fsType = "ext4";
};
swapDevices =
[ { device = "/dev/disk/by-uuid/c50f2d93-2f31-4afc-ad26-4730a8f4b7f0"; }
];
networking.useDHCP = lib.mkDefault true;
hardware.cpu.amd.updateMicrocode = lib.mkDefault config.hardware.enableRedistributableFirmware;
hardware.video.hidpi.enable = lib.mkDefault true;
}
#+end_src
** Raspberry Pis
/This section is deprecated, as my Pis now run Raspbian with k3s./
I have two Raspberry Pis - a 3B+ ("watcher"), and a 4 ("panda"). Watcher
serves as a watchdog for my self hosted services, usually living on Panda.
*** The Installer Image
Very minimal changes required here, only really need to enabled the SSH daemon and add my key so I can push the actual configuration.
I might investigate bundling the "real" configurations into the live installer image, so I have to run fewer commands.
[[https://nixos.wiki/wiki/NixOS_on_ARM#Getting_the_installer][More info on the NixOS Wiki]]
#+begin_src nix :tangle nix/image-configuration.nix
{ ... }: {
imports = [
<nixpkgs/nixos/modules/installer/sd-card/sd-image-aarch64.nix>
];
services.sshd.enable = true;
services.ntp.enable = true;
users.users.gsimmer = {
isNormalUser = true;
extraGroups = [ "wheel" ];
password = "pass"; # This gets changed. Don't get any ideas.
openssh.authorizedKeys.keys = ["ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILIztwQxt+jqroFONSgq+xzPMuE2I5Dq/zWPQ8RcTYJr gabriel@gitgalaxy.com"];
};
}
#+end_src
*** Watcher
Watcher is my Raspberry Pi 3B+ responsible for monitoring various
services and devices on my network (and generally the wider web).
It uses [[https://github.com/gmemstr/platypus][Platypus]] (my custom monitoring platform) for this, along
with some cron jobs to curl the services themselves.
Actually declaractive install of Platypus is TODO, once I have the
next release tagged.
#+begin_src nix :tangle nix/watcher-configuration.nix
{ config, pkgs, lib, ... }: {
boot.loader.grub.enable = false;
boot.loader.generic-extlinux-compatible.enable = true;
boot.kernelPackages = pkgs.linuxPackages_latest;
services.sshd.enable = true;
services.ntp.enable = true;
users.users.gsimmer = {
isNormalUser = true;
extraGroups = [ "wheel" ];
password = "pass"; # This gets changed. Don't get any ideas.
openssh.authorizedKeys.keys = ["ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILIztwQxt+jqroFONSgq+xzPMuE2I5Dq/zWPQ8RcTYJr gabriel@gitgalaxy.com"];
};
environment.systemPackages = [ pkgs.git pkgs.curl ];
systemd.user.services.ensure-curlscript = {
script = ''
# At some point this will pull down a more complete script.
echo "Done!"
'';
wantedBy = [ "multi-user.target" ];
};
# Enable cron services
services.cron = {
enable = true;
systemCronJobs = [
"*/5 * * * * gsimmer curl -I -o /dev/null -w \"$(date)|\\%{http_code}\" https://pw.gmem.ca > /home/gsimmer/pw-status"
"*/5 * * * * gsimmer curl -I -o /dev/null -w \"$(date)|\\%{http_code}\" https://hue.gmem.ca > /home/gsimmer/hue-status"
];
};
fileSystems = {
"/" = {
device = "/dev/disk/by-label/NIXOS_SD";
fsType = "ext4";
};
};
networking.firewall.enable = false;
}
#+end_src
*** Panda
Panda is a general-purpose Raspberry Pi 4, responsible for hosting
some network shares and my password manager (using [[https://github.com/dani-garcia/vaultwarden][Vaultwarden]]).
Largely TODO, this currently runs Raspbian until I'm happy with my
testbed.
#+begin_src nix :tangle nix/panda-configuration.nix
{ ... }: {
imports = [
<nixpkgs/nixos/modules/installer/sd-card/sd-image-aarch64.nix>
];
# put your own configuration here, for example ssh keys:
users.extraUsers.root.openssh.authorizedKeys.keys = [
"ssh-ed25519 AAAAC3NzaC1lZDI1NTE5AAAAILIztwQxt+jqroFONSgq+xzPMuE2I5Dq/zWPQ8RcTYJr gabriel@gitgalaxy.com"
];
}
#+end_src
Moved to [[https://vancouver.scorpion-ghost.ts.net/git/arch/infra][arch/infra]].