nixpkgs/nixos/modules/virtualisation/google-compute-config.nix

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{ config, lib, pkgs, ... }:
with lib;
let
gce = pkgs.google-compute-engine;
in
{
imports = [
../profiles/headless.nix
../profiles/qemu-guest.nix
];
fileSystems."/" = {
fsType = "ext4";
device = "/dev/disk/by-label/nixos";
autoResize = true;
};
boot.growPartition = true;
boot.kernelParams = [ "console=ttyS0" "panic=1" "boot.panic_on_fail" ];
boot.initrd.kernelModules = [ "virtio_scsi" ];
boot.kernelModules = [ "virtio_pci" "virtio_net" ];
# Generate a GRUB menu.
boot.loader.grub.device = "/dev/sda";
boot.loader.timeout = 0;
# Don't put old configurations in the GRUB menu. The user has no
# way to select them anyway.
boot.loader.grub.configurationLimit = 0;
# Allow root logins only using SSH keys
# and disable password authentication in general
services.openssh.enable = true;
services.openssh.permitRootLogin = "prohibit-password";
services.openssh.passwordAuthentication = mkDefault false;
# enable OS Login. This also requires setting enable-oslogin=TRUE metadata on
# instance or project level
security.googleOsLogin.enable = true;
# Use GCE udev rules for dynamic disk volumes
services.udev.packages = [ gce ];
# Force getting the hostname from Google Compute.
networking.hostName = mkDefault "";
# Always include cryptsetup so that NixOps can use it.
environment.systemPackages = [ pkgs.cryptsetup ];
# Make sure GCE image does not replace host key that NixOps sets
environment.etc."default/instance_configs.cfg".text = lib.mkDefault ''
[InstanceSetup]
set_host_keys = false
'';
# Rely on GCP's firewall instead
networking.firewall.enable = mkDefault false;
# Configure default metadata hostnames
networking.extraHosts = ''
169.254.169.254 metadata.google.internal metadata
'';
networking.timeServers = [ "metadata.google.internal" ];
networking.usePredictableInterfaceNames = false;
# GC has 1460 MTU
networking.interfaces.eth0.mtu = 1460;
# Used by NixOps
systemd.services.fetch-instance-ssh-keys = {
description = "Fetch host keys and authorized_keys for root user";
wantedBy = [ "sshd.service" ];
before = [ "sshd.service" ];
after = [ "network-online.target" ];
wants = [ "network-online.target" ];
path = [ pkgs.wget ];
serviceConfig = {
Type = "oneshot";
ExecStart = pkgs.runCommand "fetch-instance-ssh-keys" { } ''
cp ${./fetch-instance-ssh-keys.bash} $out
chmod +x $out
${pkgs.shfmt}/bin/shfmt -i 4 -d $out
${pkgs.shellcheck}/bin/shellcheck $out
patchShebangs $out
'';
PrivateTmp = true;
StandardError = "journal+console";
StandardOutput = "journal+console";
};
};
systemd.services.google-instance-setup = {
description = "Google Compute Engine Instance Setup";
after = [ "network-online.target" "network.target" "rsyslog.service" ];
before = [ "sshd.service" ];
path = with pkgs; [ coreutils ethtool openssh ];
serviceConfig = {
ExecStart = "${gce}/bin/google_instance_setup";
StandardOutput="journal+console";
Type = "oneshot";
};
wantedBy = [ "sshd.service" "multi-user.target" ];
};
systemd.services.google-network-daemon = {
description = "Google Compute Engine Network Daemon";
after = [ "network-online.target" "network.target" "google-instance-setup.service" ];
2021-03-14 16:05:16 +00:00
path = with pkgs; [ iproute2 ];
serviceConfig = {
ExecStart = "${gce}/bin/google_network_daemon";
StandardOutput="journal+console";
Type="simple";
};
wantedBy = [ "multi-user.target" ];
};
systemd.services.google-clock-skew-daemon = {
description = "Google Compute Engine Clock Skew Daemon";
after = [ "network.target" "google-instance-setup.service" "google-network-daemon.service" ];
serviceConfig = {
ExecStart = "${gce}/bin/google_clock_skew_daemon";
StandardOutput="journal+console";
Type = "simple";
};
wantedBy = ["multi-user.target"];
};
systemd.services.google-shutdown-scripts = {
description = "Google Compute Engine Shutdown Scripts";
after = [
"network-online.target"
"network.target"
"rsyslog.service"
"google-instance-setup.service"
"google-network-daemon.service"
];
serviceConfig = {
ExecStart = "${pkgs.coreutils}/bin/true";
ExecStop = "${gce}/bin/google_metadata_script_runner --script-type shutdown";
RemainAfterExit = true;
StandardOutput="journal+console";
TimeoutStopSec = "0";
Type = "oneshot";
};
wantedBy = [ "multi-user.target" ];
};
systemd.services.google-startup-scripts = {
description = "Google Compute Engine Startup Scripts";
after = [
"network-online.target"
"network.target"
"rsyslog.service"
"google-instance-setup.service"
"google-network-daemon.service"
];
serviceConfig = {
ExecStart = "${gce}/bin/google_metadata_script_runner --script-type startup";
KillMode = "process";
StandardOutput = "journal+console";
Type = "oneshot";
};
wantedBy = [ "multi-user.target" ];
};
environment.etc."sysctl.d/11-gce-network-security.conf".source = "${gce}/sysctl.d/11-gce-network-security.conf";
}