273 lines
7.5 KiB
Nix
273 lines
7.5 KiB
Nix
# This module sets configuration for all NixOS machines defined in this flake
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{ zentralwerk, hostRegistry, config, options, lib, pkgs, ... }:
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let
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hqPrefix64 = builtins.head (
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builtins.split "/" zentralwerk.lib.config.site.net.c3d2.subnets6.dn42
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);
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# Generate a deterministic IPv6 address for a 64 bit prefix
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# and seed string. Prefix must not contain trailing ':'.
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toIpv6Address = prefix64: seed:
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with builtins;
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let
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digest = builtins.hashString "sha256" seed;
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hextets = map (i: substring (4 * i) 4 digest) [ 0 1 2 3 ];
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in concatStringsSep ":" ([ prefix64 ] ++ hextets);
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# Generate a deterministic public IPv6 addresses
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# for the HQ networking using a seed string.
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toHqPrivateAddress = toIpv6Address hqPrefix64;
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in {
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imports = [
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./stats.nix
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./audio-server
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./logging.nix
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];
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config = let
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cfg = config.c3d2;
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mkIfIsInHq = x: lib.mkIf cfg.isInHq (lib.mkDefault x);
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in {
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# Configuration specific to this machine
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assertions = [
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{
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assertion = cfg.isInHq -> (config.users.users.root.password == null);
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message = "Root passwords not allowed in HQ";
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}
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{
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assertion = cfg.hq.enableBinaryCache -> cfg.mergeHostsFile;
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message = "mergeHostsFile must be enabled for enableBinaryCache";
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}
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{
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assertion = cfg.hq.enableMpdProxy -> cfg.mergeHostsFile;
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message = "mergeHostsFile must be enabled for enableMpdProxy";
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}
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{
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assertion = cfg.isInHq -> builtins.hasAttr config.networking.hostName cfg.hosts;
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message = "${config.networking.hostName} is not registered in ${
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toString ../host-registry.nix
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}";
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}
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( # Check for host registry address collisions
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let
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getAddrHosts = key:
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builtins.foldl' (result: host:
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if cfg.hosts.${host}.${key} != null
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then let
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addr = cfg.hosts."${host}"."${key}";
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in if result ? "${addr}"
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then result // {
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"${addr}" = result."${addr}" ++ [ host ];
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}
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else result // {
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"${addr}" = [ host ];
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}
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else result
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) {} (builtins.attrNames cfg.hosts);
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dupHosts =
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builtins.concatMap (hosts:
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if builtins.length hosts == 1
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then []
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else hosts
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) (
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builtins.attrValues (
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getAddrHosts "ip4" // getAddrHosts "ip6"
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)
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);
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in {
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assertion = dupHosts == [];
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message = "Hosts have duplicate addresses: ${
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lib.concatStringsSep " " dupHosts
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}";
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})
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];
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c3d2.allUsersCanSshRoot = lib.mkDefault true;
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i18n = {
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defaultLocale = "en_US.UTF-8";
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supportedLocales = [
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"en_US.UTF-8/UTF-8"
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"de_DE.UTF-8/UTF-8"
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"C.UTF-8/UTF-8"
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];
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};
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networking.defaultGateway = lib.mkIf (!config.networking.useNetworkd) (
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mkIfIsInHq "172.22.99.4"
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);
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networking.domain = mkIfIsInHq "hq.c3d2.de";
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systemd.network.networks =
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if cfg.hq.interface != null && config.networking.useNetworkd
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then {
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"40-eth0".routes = [ {
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routeConfig = {
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Gateway = "172.22.99.4";
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GatewayOnLink = true;
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};
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} ];
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} else {};
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networking.interfaces =
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/* (if cfg.hq.externalInterface == null then
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{ }
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else {
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"${cfg.hq.externalInterface}" = {
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ipv6.addresses = [{
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address = toHqPublicAddress config.networking.hostName;
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prefixLength = 64;
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}];
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};
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}) //
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*/
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if cfg.hq.interface == null then
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{ }
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else {
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"${cfg.hq.interface}" = {
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ipv6.addresses = [{
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address = toHqPrivateAddress config.networking.hostName;
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prefixLength = 64;
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}];
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};
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};
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networking.nameservers = with hostRegistry.hosts.dnscache; [
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ip4
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ip6
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"9.9.9.9"
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];
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networking.useHostResolvConf = lib.mkIf (!config.services.resolved.enable) true;
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environment.etc."resolv.conf" = lib.mkIf (!config.services.resolved.enable) {
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text = lib.concatMapStrings (ns: ''
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nameserver ${ns}
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'') config.networking.nameservers;
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};
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nix = {
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autoOptimiseStore = true;
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binaryCachePublicKeys = lib.mkIf (config.networking.hostName != "hydra") [
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(builtins.readFile ../hosts/hydra/cache-pub.key)
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];
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binaryCaches = lib.mkIf (config.networking.hostName != "hydra") (
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lib.mkBefore [ "https://hydra.hq.c3d2.de" ]
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);
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gc = {
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automatic = true;
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dates = "06:00";
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options = "--delete-older-than 21d";
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randomizedDelaySec = "6h";
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};
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registry.c3d2 = {
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from = {
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id = "c3d2";
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type = "indirect";
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};
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to = {
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type = "git";
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url = "https://gitea.c3d2.de/C3D2/nix-config.git";
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};
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};
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extraOptions = ''
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experimental-features = nix-command flakes
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builders-use-substitutes = true
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'';
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};
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services.openssh = {
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# Required for deployment
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enable = true;
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permitRootLogin = "prohibit-password";
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};
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environment = {
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systemPackages = with pkgs; [
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# Network fetchers
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curl wget git
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# System monitors
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htop iotop bmon
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ripgrep
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# Terminal managers
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tmux screen
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# Editors
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vim
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# Pipeview
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pv
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# Network debugging
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tcpdump ethtool mtr
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];
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variables = {
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TERM = "xterm-256color";
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};
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# breaks various package builds
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noXlibs = lib.mkForce false;
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};
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programs = {
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ssh.knownHosts = with builtins;
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let
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intersectKeys = intersectAttrs {
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publicKey = null;
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publicKeyFile = null;
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};
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list = map (name:
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let
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host = getAttr name cfg.hosts;
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sshAttrs = intersectKeys host;
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in if sshAttrs == { } then
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null
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else {
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inherit name;
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value = let
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ip6 = if host.ip6 != null then
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host.ip6
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else
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toHqPrivateAddress name;
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in {
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publicKey = null;
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publicKeyFile = null;
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hostNames = [ ip6 "${name}.hq.c3d2.de" "${name}.hq" name ];
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} // sshAttrs;
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}) (builtins.attrNames cfg.hosts);
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keyedHosts = filter (x: x.value.publicKey != null || x.value.publicKeyFile != null) list;
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in listToAttrs keyedHosts;
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vim.defaultEditor = true;
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};
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services.nginx = lib.mkIf config.services.nginx.enable {
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recommendedGzipSettings = true;
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recommendedOptimisation = true;
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recommendedProxySettings = true;
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recommendedTlsSettings = true;
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};
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time.timeZone = lib.mkDefault "Europe/Berlin";
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# Reboot on hang
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systemd.watchdog = lib.mkIf (!config.boot.isContainer) {
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runtimeTime = "15s";
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rebootTime = "15s";
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};
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# Defaults for LetsEncrypt
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security.acme =
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if options.security.acme ? defaults
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then {
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acceptTerms = true;
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# NixOS>=22.05
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defaults.email = cfg.acmeEmail;
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}
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else {
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acceptTerms = true;
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# TODO: NixOS<=21.05
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email = cfg.acmeEmail;
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};
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zramSwap.enable = true;
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};
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}
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