nixos/defaults.nix

   1 { flakes, pkgs, lib, config, ... }:
   2 let inherit (lib) types;
   3     inherit (config.networking) hostName domain;
   4 in
   5 {
   6 imports = [
   7   ./modules.nix
   8   defaults/predictable-interface-names.nix
   9 ];
  10 nix = {
  11   #binaryCaches = lib.mkForce [];
  12   extraOptions = ''
  13   '';
  14   # Use gc.automatic to keep disk space under control.
  15   gc = {
  16     automatic = lib.mkDefault true;
  17     dates = lib.mkDefault "weekly";
  18     options = lib.mkDefault "--delete-older-than 30d";
  19   };
  20   nixPath = [
  21     # WARNING: this is a hack to avoid copying Nixpkgs
  22     # a second time into the Nix store.
  23     # It makes only sense when Nixpkgs is already in the Nix store,
  24     # and is registered.
  25     "nixpkgs=/etc/nixpkgs:nixpkgs-overlays=/etc/nixpkgs-overlays/overlays.nix"
  26   ];
  27 };
  28 environment.etc."nixpkgs".source = flakes.nixpkgs;
  29 environment.etc."nixpkgs-overlays".source = flakes.self + "/nixpkgs";
  30
  31 nixpkgs = {
  32   config = {
  33     allowUnfree = false;
  34     /*
  35     packageOverrides = pkgs: {
  36       postfix = pkgs.postfix.override {
  37         withLDAP = true;
  38       };
  39     };
  40     */
  41   };
  42   overlays = import (flakes.self + "/nixpkgs/overlays.nix");
  43 };
  44
  45 documentation.nixos = {
  46   enable = false; # NOTE: useless on a server, and CPU intensive.
  47 };
  48
  49 time = {
  50   timeZone = "Europe/Paris";
  51 };
  52
  53 i18n = {
  54   defaultLocale = "fr_FR.UTF-8";
  55 };
  56
  57 console = {
  58   font   = "Lat2-Terminus16";
  59   keyMap = "fr";
  60 };
  61
  62 # Always try to start all the units (default.target)
  63 # because systemd's emergency shell does not try to start sshd.
  64 # https://wiki.archlinux.org/index.php/systemd#Disable_emergency_mode_on_remote_machine
  65 systemd.enableEmergencyMode = false;
  66
  67 # This is a remote headless server: always reboot on a kernel panic,
  68 # to not have to physically go power cycle the apu2e4.
  69 # Which happens if the wrong ZFS password is used
  70 # but the boot is manually forced to continue.
  71 # Using kernelParams instead of kernel.sysctl
  72 # sets this up as soon as the initrd.
  73 boot.kernelParams = [ "panic=10" ];
  74
  75 boot.cleanTmpDir = true;
  76 boot.tmpOnTmpfs = true;
  77
  78 networking = {
  79   # Fix hostname --fqdn
  80   # See: https://github.com/NixOS/nixpkgs/issues/10183#issuecomment-537629621
  81   hosts = {
  82     "127.0.1.1" = lib.mkForce [ "${hostName}.${domain}" hostName ];
  83     "::1"       = lib.mkForce [ "${hostName}.${domain}" hostName "localhost" ];
  84   };
  85   search = [ domain ];
  86 };
  87
  88 services = {
  89   openssh = {
  90     enable = true;
  91     passwordAuthentication = false;
  92     extraConfig = ''
  93     '';
  94   };
  95   journald = {
  96     extraConfig = ''
  97       Compress=true
  98       MaxRetentionSec=3month
  99       Storage=persistent
 100       SystemMaxUse=500M
 101     '';
 102   };
 103 };
 104
 105 environment.systemPackages = with pkgs; [
 106   binutils
 107   bmon
 108   conntrack-tools
 109   #dnsutils
 110   dstat
 111   gnupg
 112   htop
 113   inetutils
 114   iftop
 115   iotop
 116   ldns
 117   linuxPackages.cpupower
 118   lsof
 119   mailutils
 120   multitail
 121   ncdu
 122   nethogs
 123   nload
 124   nmon
 125   pv
 126   swaplist
 127   tcpdump
 128   tmux
 129   tree
 130   vim
 131   which
 132 ];
 133 environment.variables.SYSTEMD_LESS = "FKMRX";
 134 environment.etc."inputrc".text = lib.readFile defaults/readline/inputrc;
 135
 136 programs = {
 137   bash = {
 138     interactiveShellInit = ''
 139       bind '"\e[A":history-search-backward'
 140       bind '"\e[B":history-search-forward'
 141
 142       # Ignore duplicate commands, ignore commands starting with a space
 143       export HISTCONTROL=erasedups:ignorespace
 144       export HISTSIZE=42000
 145
 146       # Append to the history instead of overwriting (good for multiple connections)
 147       shopt -s histappend
 148
 149       # Enable ** file pattern
 150       shopt -s globstar
 151
 152       # Convenient mkdir wrapper
 153       mkcd() { mkdir -p "$1" && cd "$1"; }
 154     '';
 155     shellAliases = {
 156       cl = "clear";
 157       l  = "ls -alh";
 158       ll = "ls -al";
 159       ls = "ls --color=tty";
 160       mem = "ps -e -orss=,user=,args= | sort -b -k1,1n";
 161
 162       s="sudo systemctl";
 163       st="sudo systemctl status";
 164       s-u="systemctl --user";
 165       j="sudo journalctl -u";
 166
 167       nixos-clean="sudo nix-collect-garbage -d";
 168       nixos-history="sudo nix-env --list-generations --profile /nix/var/nix/profiles/system";
 169       nixos-rollback="sudo nixos-rebuild switch --rollback";
 170       nixos-update="sudo nix-channel --update";
 171       nixos-upgrade="sudo nixos-rebuild switch";
 172       nixos-upstream="sudo nix-channel --list";
 173     };
 174   };
 175   gnupg = {
 176     agent = {
 177       pinentryFlavor = "curses";
 178     };
 179   };
 180   mosh.enable = true;
 181   mtr.enable = true;
 182 };
 183 }