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https://github.com/NixOS/nixpkgs.git
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nixos/lxd: add virtual-machine support, image and module
This commit is contained in:
Adam Stephens
parent
73982ef92a
commit
efd1605be6
15 changed files with 365 additions and 232 deletions
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@ -1,96 +1,16 @@
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{ lib, config, pkgs, ... }:
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with lib;
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let
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templateSubmodule = { ... }: {
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options = {
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enable = mkEnableOption (lib.mdDoc "this template");
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target = mkOption {
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description = lib.mdDoc "Path in the container";
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type = types.path;
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};
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template = mkOption {
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description = lib.mdDoc ".tpl file for rendering the target";
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type = types.path;
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};
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when = mkOption {
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description = lib.mdDoc "Events which trigger a rewrite (create, copy)";
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type = types.listOf (types.str);
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};
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properties = mkOption {
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description = lib.mdDoc "Additional properties";
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type = types.attrs;
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default = {};
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};
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};
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};
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toYAML = name: data: pkgs.writeText name (generators.toYAML {} data);
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cfg = config.virtualisation.lxc;
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templates = if cfg.templates != {} then let
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list = mapAttrsToList (name: value: { inherit name; } // value)
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(filterAttrs (name: value: value.enable) cfg.templates);
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in
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{
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files = map (tpl: {
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source = tpl.template;
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target = "/templates/${tpl.name}.tpl";
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}) list;
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properties = listToAttrs (map (tpl: nameValuePair tpl.target {
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when = tpl.when;
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template = "${tpl.name}.tpl";
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properties = tpl.properties;
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}) list);
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}
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else { files = []; properties = {}; };
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in
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{
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in {
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imports = [
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../installer/cd-dvd/channel.nix
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../profiles/clone-config.nix
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../profiles/minimal.nix
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./lxc-instance-common.nix
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];
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options = {
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virtualisation.lxc = {
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templates = mkOption {
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description = lib.mdDoc "Templates for LXD";
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type = types.attrsOf (types.submodule (templateSubmodule));
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default = {};
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example = literalExpression ''
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{
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# create /etc/hostname on container creation. also requires networking.hostName = "" to be set
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"hostname" = {
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enable = true;
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target = "/etc/hostname";
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template = builtins.toFile "hostname.tpl" "{{ container.name }}";
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when = [ "create" ];
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};
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# create /etc/nixos/hostname.nix with a configuration for keeping the hostname applied
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"hostname-nix" = {
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enable = true;
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target = "/etc/nixos/hostname.nix";
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template = builtins.toFile "hostname-nix.tpl" "{ ... }: { networking.hostName = \"{{ container.name }}\"; }";
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# copy keeps the file updated when the container is changed
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when = [ "create" "copy" ];
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};
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# copy allow the user to specify a custom configuration.nix
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"configuration-nix" = {
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enable = true;
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target = "/etc/nixos/configuration.nix";
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template = builtins.toFile "configuration-nix" "{{ config_get(\"user.user-data\", properties.default) }}";
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when = [ "create" ];
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};
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};
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'';
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};
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privilegedContainer = mkOption {
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type = types.bool;
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privilegedContainer = lib.mkOption {
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type = lib.types.bool;
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default = false;
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description = lib.mdDoc ''
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Whether this LXC container will be running as a privileged container or not. If set to `true` then
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@ -116,24 +36,6 @@ in
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${config.nix.package.out}/bin/nix-env -p /nix/var/nix/profiles/system --set /run/current-system
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'';
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system.build.metadata = pkgs.callPackage ../../lib/make-system-tarball.nix {
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contents = [
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{
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source = toYAML "metadata.yaml" {
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architecture = builtins.elemAt (builtins.match "^([a-z0-9_]+).+" (toString pkgs.system)) 0;
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creation_date = 1;
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properties = {
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description = "${config.system.nixos.distroName} ${config.system.nixos.codeName} ${config.system.nixos.label} ${pkgs.system}";
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os = "${config.system.nixos.distroId}";
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release = "${config.system.nixos.codeName}";
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};
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templates = templates.properties;
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};
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target = "/metadata.yaml";
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}
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] ++ templates.files;
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};
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# TODO: build rootfs as squashfs for faster unpack
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system.build.tarball = pkgs.callPackage ../../lib/make-system-tarball.nix {
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extraArgs = "--owner=0";
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@ -180,7 +82,7 @@ in
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ProtectKernelTunables=no
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NoNewPrivileges=no
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LoadCredential=
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'' + optionalString cfg.privilegedContainer ''
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'' + lib.optionalString cfg.privilegedContainer ''
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# Additional settings for privileged containers
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ProtectHome=no
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ProtectSystem=no
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@ -193,28 +95,8 @@ in
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})
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];
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# Allow the user to login as root without password.
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users.users.root.initialHashedPassword = mkOverride 150 "";
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system.activationScripts.installInitScript = mkForce ''
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system.activationScripts.installInitScript = lib.mkForce ''
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ln -fs $systemConfig/init /sbin/init
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'';
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# Some more help text.
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services.getty.helpLine =
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''
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Log in as "root" with an empty password.
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'';
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# Containers should be light-weight, so start sshd on demand.
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services.openssh.enable = mkDefault true;
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services.openssh.startWhenNeeded = mkDefault true;
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# As this is intended as a standalone image, undo some of the minimal profile stuff
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environment.noXlibs = false;
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documentation.enable = true;
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documentation.nixos.enable = true;
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services.logrotate.enable = true;
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};
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}
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104
nixos/modules/virtualisation/lxc-image-metadata.nix
Normal file
104
nixos/modules/virtualisation/lxc-image-metadata.nix
Normal file
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@ -0,0 +1,104 @@
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{ lib, config, pkgs, ... }:
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let
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templateSubmodule = {...}: {
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options = {
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enable = lib.mkEnableOption "this template";
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target = lib.mkOption {
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description = "Path in the container";
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type = lib.types.path;
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};
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template = lib.mkOption {
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description = ".tpl file for rendering the target";
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type = lib.types.path;
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};
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when = lib.mkOption {
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description = "Events which trigger a rewrite (create, copy)";
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type = lib.types.listOf (lib.types.str);
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};
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properties = lib.mkOption {
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description = "Additional properties";
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type = lib.types.attrs;
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default = {};
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};
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};
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};
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toYAML = name: data: pkgs.writeText name (lib.generators.toYAML {} data);
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cfg = config.virtualisation.lxc;
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templates = if cfg.templates != {} then let
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list = lib.mapAttrsToList (name: value: { inherit name; } // value)
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(lib.filterAttrs (name: value: value.enable) cfg.templates);
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in
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{
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files = map (tpl: {
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source = tpl.template;
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target = "/templates/${tpl.name}.tpl";
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}) list;
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properties = lib.listToAttrs (map (tpl: lib.nameValuePair tpl.target {
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when = tpl.when;
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template = "${tpl.name}.tpl";
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properties = tpl.properties;
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}) list);
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}
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else { files = []; properties = {}; };
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in {
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options = {
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virtualisation.lxc = {
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templates = lib.mkOption {
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description = "Templates for LXD";
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type = lib.types.attrsOf (lib.types.submodule templateSubmodule);
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default = {};
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example = lib.literalExpression ''
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{
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# create /etc/hostname on container creation
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"hostname" = {
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enable = true;
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target = "/etc/hostname";
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template = builtins.writeFile "hostname.tpl" "{{ container.name }}";
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when = [ "create" ];
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};
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# create /etc/nixos/hostname.nix with a configuration for keeping the hostname applied
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"hostname-nix" = {
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enable = true;
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target = "/etc/nixos/hostname.nix";
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template = builtins.writeFile "hostname-nix.tpl" "{ ... }: { networking.hostName = "{{ container.name }}"; }";
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# copy keeps the file updated when the container is changed
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when = [ "create" "copy" ];
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};
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# copy allow the user to specify a custom configuration.nix
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"configuration-nix" = {
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enable = true;
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target = "/etc/nixos/configuration.nix";
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template = builtins.writeFile "configuration-nix" "{{ config_get(\"user.user-data\", properties.default) }}";
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when = [ "create" ];
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};
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};
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'';
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};
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};
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};
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config = {
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system.build.metadata = pkgs.callPackage ../../lib/make-system-tarball.nix {
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contents = [
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{
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source = toYAML "metadata.yaml" {
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architecture = builtins.elemAt (builtins.match "^([a-z0-9_]+).+" (toString pkgs.system)) 0;
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creation_date = 1;
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properties = {
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description = "${config.system.nixos.distroName} ${config.system.nixos.codeName} ${config.system.nixos.label} ${pkgs.system}";
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os = "${config.system.nixos.distroId}";
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release = "${config.system.nixos.codeName}";
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};
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templates = templates.properties;
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};
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target = "/metadata.yaml";
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}
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] ++ templates.files;
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};
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};
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}
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30
nixos/modules/virtualisation/lxc-instance-common.nix
Normal file
30
nixos/modules/virtualisation/lxc-instance-common.nix
Normal file
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@ -0,0 +1,30 @@
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{lib, ...}:
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{
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imports = [
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./lxc-image-metadata.nix
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../installer/cd-dvd/channel.nix
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../profiles/clone-config.nix
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../profiles/minimal.nix
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];
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# Allow the user to login as root without password.
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users.users.root.initialHashedPassword = lib.mkOverride 150 "";
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# Some more help text.
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services.getty.helpLine = ''
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Log in as "root" with an empty password.
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'';
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# Containers should be light-weight, so start sshd on demand.
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services.openssh.enable = lib.mkDefault true;
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services.openssh.startWhenNeeded = lib.mkDefault true;
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# As this is intended as a standalone image, undo some of the minimal profile stuff
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environment.noXlibs = false;
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documentation.enable = true;
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documentation.nixos.enable = true;
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services.logrotate.enable = true;
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}
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46
nixos/modules/virtualisation/lxd-virtual-machine.nix
Normal file
46
nixos/modules/virtualisation/lxd-virtual-machine.nix
Normal file
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@ -0,0 +1,46 @@
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{ config, lib, pkgs, ... }:
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let
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serialDevice =
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if pkgs.stdenv.hostPlatform.isx86
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then "ttyS0"
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else "ttyAMA0"; # aarch64
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in {
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imports = [
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./lxc-instance-common.nix
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../profiles/qemu-guest.nix
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];
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config = {
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system.build.qemuImage = import ../../lib/make-disk-image.nix {
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inherit pkgs lib config;
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partitionTableType = "efi";
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format = "qcow2-compressed";
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copyChannel = true;
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};
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fileSystems = {
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"/" = {
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device = "/dev/disk/by-label/nixos";
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autoResize = true;
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fsType = "ext4";
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};
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"/boot" = {
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device = "/dev/disk/by-label/ESP";
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fsType = "vfat";
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};
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};
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boot.growPartition = true;
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boot.loader.systemd-boot.enable = true;
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# image building needs to know what device to install bootloader on
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boot.loader.grub.device = "/dev/vda";
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boot.kernelParams = ["console=tty1" "console=${serialDevice}"];
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virtualisation.lxd.agent.enable = lib.mkDefault true;
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};
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}
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@ -196,7 +196,7 @@ in {
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"kernel.keys.maxkeys" = 2000;
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};
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boot.kernelModules = [ "veth" "xt_comment" "xt_CHECKSUM" "xt_MASQUERADE" ]
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boot.kernelModules = [ "veth" "xt_comment" "xt_CHECKSUM" "xt_MASQUERADE" "vhost_vsock" ]
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++ optionals (!config.networking.nftables.enable) [ "iptable_mangle" ];
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};
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}
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