base.nix
1# hosts/common/base.nix
2# Base system configuration - boot, filesystems, networking
3{ config, lib, pkgs, ... }:
4
5{
6 # Boot and filesystems are defined in hardware-configuration.nix
7 # which is imported per-host
8
9 # Basic networking
10 networking.useDHCP = lib.mkDefault true;
11
12 # Enable IPv6 Router Advertisements (required for Hetzner IPv6)
13 # Hetzner uses RAs for IPv6 configuration rather than DHCPv6
14 networking.tempAddresses = "disabled";
15 boot.kernel.sysctl = {
16 "net.ipv6.conf.all.accept_ra" = 1;
17 "net.ipv6.conf.default.accept_ra" = 1;
18 };
19
20 # Configure dhcpcd for IPv6
21 networking.dhcpcd.extraConfig = ''
22 # Enable IPv6
23 ipv6
24
25 # Wait for IPv6 Router Advertisements
26 waitip 6
27 '';
28
29 # Time and locale
30 time.timeZone = lib.mkDefault "UTC";
31 i18n.defaultLocale = lib.mkDefault "en_US.UTF-8";
32
33 # Essential packages
34 environment.systemPackages = with pkgs; [
35 git
36 htop
37 jq
38 lazyjournal
39 ];
40
41 # Enable neovim (system-wide) - plain, no plugins
42 programs.neovim = {
43 enable = true;
44 vimAlias = true; # Makes 'vim' command run neovim
45 viAlias = true; # Makes 'vi' command run neovim
46 defaultEditor = true; # Sets $EDITOR to neovim
47 };
48
49 # Enable flakes
50 nix.settings.experimental-features = [ "nix-command" "flakes" ];
51
52 # Basic system state version
53 system.stateVersion = lib.mkDefault "24.11";
54
55 # Systemd service for Nix garbage collection
56 systemd.services.custom-nix-gc = {
57 description = "Nix garbage collection - remove generations older than 14 days";
58 serviceConfig = {
59 Type = "oneshot";
60 ExecStart = "${pkgs.nix}/bin/nix-collect-garbage --delete-older-than 14d";
61 User = "root";
62 };
63 };
64
65 # Systemd timer - run weekly on Sundays at 3:00 AM
66 systemd.timers.custom-nix-gc = {
67 description = "Nix garbage collection timer (weekly)";
68 wantedBy = [ "timers.target" ];
69 timerConfig = {
70 OnCalendar = "Sun *-*-* 03:00:00";
71 Persistent = true;
72 };
73 };
74}
