{ flake, pkgs, lib, ... }:
{
  imports = with flake.nixosModules.systemProfiles; [
    openssh rebuild-machines initrd-all-crypto-modules
  ];

  config = {
    nixpkgs = {
      system = "x86_64-linux";
    };

    networking.hostId = "1e7ddd78";
    environment.etc."machine-id".text = "1e7ddd784c525bba2a03d7c160c5da4e";

    boot = {
      loader.grub = {
        enable = true;
        version = 2;
        device = "/dev/disk/by-id/usb-Intenso_Slim_Line_22010091300228-0:0";
      };

      kernelPackages = pkgs.linuxPackages_latest;

      tmpOnTmpfs = true;

      supportedFilesystems = [ "zfs" ];
      zfs = {
        enableUnstable = true;
      };

      initrd.kernelModules = [ "dm_raid" ];
    };

    fileSystems = {
      "/" = {
        fsType = "tmpfs";
        options = [ "mode=0755" ];
      };
    };

    networking = {
      hostName = "vidhar";
      domain = "asgard.yggdrasil";
      search = [ "asgard.yggdrasil" "yggdrasil" ];

      useDHCP = false;
      useNetworkd = true;

      interfaces."eno1".useDHCP = true;

      firewall = {
        enable = true;
        allowPing = true;
        allowedTCPPorts = [
          22 # ssh
        ];
        allowedUDPPortRanges = [
          { from = 60000; to = 61000; } # mosh
        ];
      };
    };
    services.timesyncd.enable = false;
    services.chrony = {
      enable = true;
      servers = [];
      extraConfig = ''
        pool time.cloudflare.com iburst nts
        pool nts.ntp.se iburst nts
        server nts.sth1.ntp.se iburst nts
        server nts.sth2.ntp.se iburst nts
        server ptbtime1.ptb.de iburst nts
        server ptbtime2.ptb.de iburst nts
        server ptbtime3.ptb.de iburst nts

        makestep 0.1 3

        cmdport 0
      '';
    };

    services.openssh = {
      enable = true;
      passwordAuthentication = false;
      challengeResponseAuthentication = false;
      extraConfig = ''
        AllowGroups ssh
      '';
    };
    users.groups."ssh" = {
      members = ["root"];
    };

    security.sudo.extraConfig = ''
      Defaults lecture = never
    '';

    nix.gc = {
      automatic = true;
      options = "--delete-older-than 30d";
    };
  };
}