google-compute-image module: use google services
This adds a few google-specific services to setup the machine. Accounts are now dynamically created using the google-accounts-daemon, which allows to click on the "SSH" button in the console and have it working. The NixOS image now supports the userdata startup and shutdown scripts. Misc: * add all the google services from https://github.com/GoogleCloudPlatform/compute-image-packages/tree/master/google_compute_engine_init/systemd * add udev rules for disk labels * synched sysctl rules with https://github.com/GoogleCloudPlatform/compute-image-packages/blob/master/google_config/sysctl/11-gce-network-security.conf
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zimbatm
parent
812346c9c9
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@ -3,13 +3,11 @@
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with lib;
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let
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diskSize = 1024; # MB
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gce = pkgs.google-compute-engine;
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in
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{
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imports = [ ../profiles/headless.nix ../profiles/qemu-guest.nix ./grow-partition.nix ];
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# https://cloud.google.com/compute/docs/tutorials/building-images
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networking.firewall.enable = mkDefault false;
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system.build.googleComputeImage = import ../../lib/make-disk-image.nix {
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name = "google-compute-image";
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postVM = ''
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@ -49,12 +47,18 @@ in
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services.openssh.permitRootLogin = "prohibit-password";
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services.openssh.passwordAuthentication = mkDefault false;
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# Use GCE udev rules for dynamic disk volumes
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services.udev.packages = [ gce ];
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# Force getting the hostname from Google Compute.
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networking.hostName = mkDefault "";
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# Always include cryptsetup so that NixOps can use it.
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environment.systemPackages = [ pkgs.cryptsetup ];
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# Rely on GCP's firewall instead
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networking.firewall.enable = mkDefault false;
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# Configure default metadata hostnames
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networking.extraHosts = ''
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169.254.169.254 metadata.google.internal metadata
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@ -64,6 +68,132 @@ in
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networking.usePredictableInterfaceNames = false;
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# allow the google-accounts-daemon to manage users
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users.mutableUsers = true;
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# and allow users to sudo without password
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security.sudo.enable = true;
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security.sudo.extraConfig = ''
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%google-sudoers ALL=(ALL:ALL) NOPASSWD:ALL
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'';
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# NOTE: google-accounts tries to write to /etc/sudoers.d but the folder doesn't exist
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# FIXME: not such file or directory on dynamic SSH provisioning
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systemd.services.google-accounts-daemon = {
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description = "Google Compute Engine Accounts Daemon";
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# This daemon creates dynamic users
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enable = config.users.mutableUsers;
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after = [
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"network.target"
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"google-instance-setup.service"
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"google-network-setup.service"
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];
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wantedBy = [ "multi-user.target" ];
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requires = ["network.target"];
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path = with pkgs; [ shadow ];
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serviceConfig = {
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Type = "simple";
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ExecStart = "${gce}/bin/google_accounts_daemon --debug";
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};
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};
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systemd.services.google-clock-skew-daemon = {
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description = "Google Compute Engine Clock Skew Daemon";
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after = [
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"network.target"
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"google-instance-setup.service"
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"google-network-setup.service"
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];
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requires = [ "network.target" ];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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Type = "simple";
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ExecStart = "${gce}/bin/google_clock_skew_daemon --debug";
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};
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};
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systemd.services.google-instance-setup = {
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description = "Google Compute Engine Instance Setup";
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after = ["fs.target" "network-online.target" "network.target" "rsyslog.service"];
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before = ["sshd.service"];
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wants = ["local-fs.target" "network-online.target" "network.target"];
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wantedBy = [ "sshd.service" "multi-user.target" ];
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path = with pkgs; [ ethtool ];
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serviceConfig = {
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ExecStart = "${gce}/bin/google_instance_setup --debug";
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Type = "oneshot";
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};
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};
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systemd.services.google-ip-forwarding-daemon = {
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description = "Google Compute Engine IP Forwarding Daemon";
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after = ["network.target" "google-instance-setup.service" "google-network-setup.service"];
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requires = ["network.target"];
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wantedBy = [ "multi-user.target" ];
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path = with pkgs; [ iproute ];
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serviceConfig = {
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Type = "simple";
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ExecStart = "${gce}/bin/google_ip_forwarding_daemon --debug";
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};
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};
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systemd.services.google-shutdown-scripts = {
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description = "Google Compute Engine Shutdown Scripts";
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after = [
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"local-fs.target"
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"network-online.target"
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"network.target"
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"rsyslog.service"
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"google-instance-setup.service"
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"google-network-setup.service"
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];
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wants = [ "local-fs.target" "network-online.target" "network.target"];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${pkgs.coreutils}/bin/true";
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ExecStop = "${gce}/bin/google_metadata_script_runner --debug --script-type shutdown";
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Type = "oneshot";
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RemainAfterExit = true;
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TimeoutStopSec = 0;
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};
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};
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systemd.services.google-network-setup = {
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description = "Google Compute Engine Network Setup";
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after = [
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"local-fs.target"
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"network-online.target"
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"network.target"
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"rsyslog.service"
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];
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wants = [ "local-fs.target" "network-online.target" "network.target"];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${gce}/bin/google_network_setup --debug";
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KillMode = "process";
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Type = "oneshot";
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};
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};
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systemd.services.google-startup-scripts = {
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description = "Google Compute Engine Startup Scripts";
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after = [
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"local-fs.target"
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"network-online.target"
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"network.target"
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"rsyslog.service"
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"google-instance-setup.service"
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"google-network-setup.service"
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];
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wants = [ "local-fs.target" "network-online.target" "network.target"];
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wantedBy = [ "multi-user.target" ];
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serviceConfig = {
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ExecStart = "${gce}/bin/google_metadata_script_runner --debug --script-type startup";
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KillMode = "process";
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Type = "oneshot";
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};
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};
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# TODO: remove this
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systemd.services.fetch-ssh-keys =
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{ description = "Fetch host keys and authorized_keys for root user";
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@ -113,9 +243,13 @@ in
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serviceConfig.StandardOutput = "journal+console";
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};
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# Setings taken from https://cloud.google.com/compute/docs/tutorials/building-images#providedkernel
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# Settings taken from https://github.com/GoogleCloudPlatform/compute-image-packages/blob/master/google_config/sysctl/11-gce-network-security.conf
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boot.kernel.sysctl = {
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# enables syn flood protection
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# Turn on SYN-flood protections. Starting with 2.6.26, there is no loss
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# of TCP functionality/features under normal conditions. When flood
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# protections kick in under high unanswered-SYN load, the system
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# should remain more stable, with a trade off of some loss of TCP
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# functionality/features (e.g. TCP Window scaling).
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"net.ipv4.tcp_syncookies" = mkDefault "1";
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# ignores source-routed packets
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@ -169,6 +303,11 @@ in
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# randomizes addresses of mmap base, heap, stack and VDSO page
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"kernel.randomize_va_space" = mkDefault "2";
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# Reboot the machine soon after a kernel panic.
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"kernel.panic" = mkDefault "10";
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## Not part of the original config
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# provides protection from ToCToU races
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"fs.protected_hardlinks" = mkDefault "1";
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