{ 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" ]; path = with pkgs; [ iproute ]; 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"; }