nixos-config/machines/dolomite/lightsail.nix

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{ config, lib, pkgs, modulesPath, ... }:
with lib;
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let
cfg = config.ec2;
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in
{
imports = [
"${modulesPath}/profiles/headless.nix"
# Note: While we do use the headless profile, we also explicitly
# turn on the serial console on ttyS0 below. This is because
# AWS does support accessing the serial console:
# https://docs.aws.amazon.com/AWSEC2/latest/UserGuide/configure-access-to-serial-console.html
"${modulesPath}/virtualisation/ec2-data.nix"
"${modulesPath}/virtualisation/amazon-init.nix"
];
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options = {
isLightsail = mkEnableOption "Lightsail instance";
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};
config = mkIf config.isLightsail {
boot.loader.grub.device = "/dev/nvme0n1";
# from nixpkgs amazon-image.nix
assertions = [ ];
boot.growPartition = true;
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fileSystems."/" = {
device = "/dev/disk/by-label/nixos";
fsType = "ext4";
autoResize = true;
};
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fileSystems."/boot" = {
# The ZFS image uses a partition labeled ESP whether or not we're
# booting with EFI.
device = "/dev/disk/by-label/ESP";
fsType = "vfat";
};
boot.extraModulePackages = [
config.boot.kernelPackages.ena
];
boot.initrd.kernelModules = [ "xen-blkfront" ];
boot.initrd.availableKernelModules = [ "nvme" ];
boot.kernelParams = [ "console=ttyS0,115200n8" "random.trust_cpu=on" ];
# Prevent the nouveau kernel module from being loaded, as it
# interferes with the nvidia/nvidia-uvm modules needed for CUDA.
# Also blacklist xen_fbfront to prevent a 30 second delay during
# boot.
boot.blacklistedKernelModules = [ "nouveau" "xen_fbfront" ];
boot.loader.grub.efiSupport = cfg.efi;
boot.loader.grub.efiInstallAsRemovable = cfg.efi;
boot.loader.timeout = 1;
boot.loader.grub.extraConfig = ''
serial --unit=0 --speed=115200 --word=8 --parity=no --stop=1
terminal_output console serial
terminal_input console serial
'';
systemd.services.fetch-ec2-metadata = {
wantedBy = [ "multi-user.target" ];
wants = [ "network-online.target" ];
after = ["network-online.target"];
path = [ pkgs.curl ];
script = builtins.readFile ./ec2-metadata-fetcher.sh;
serviceConfig.Type = "oneshot";
serviceConfig.StandardOutput = "journal+console";
};
# Amazon-issued AMIs include the SSM Agent by default, so we do the same.
# https://docs.aws.amazon.com/systems-manager/latest/userguide/ami-preinstalled-agent.html
services.amazon-ssm-agent.enable = true;
# Allow root logins only using the SSH key that the user specified
# at instance creation time.
services.openssh.enable = true;
services.openssh.settings.PermitRootLogin = "prohibit-password";
# Enable the serial console on ttyS0
systemd.services."serial-getty@ttyS0".enable = true;
# Creates symlinks for block device names.
services.udev.packages = [ pkgs.amazon-ec2-utils ];
# Force getting the hostname from EC2.
# networking.hostName = mkDefault "";
# Always include cryptsetup so that Charon can use it.
environment.systemPackages = [ pkgs.cryptsetup ];
# EC2 has its own NTP server provided by the hypervisor
networking.timeServers = [ "169.254.169.123" ];
# udisks has become too bloated to have in a headless system
# (e.g. it depends on GTK).
services.udisks2.enable = false;
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};
}