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Merge pull request #134981 from DeterminateSystems/aws-ami

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AWS AMI: Make the serial console access useful.
This commit is contained in:
Graham Christensen 2021-08-21 19:21:30 -04:00 committed by GitHub
commit 1c145df9ae
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2 changed files with 20 additions and 8 deletions
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2
nixos/modules/profiles/headless.nix
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@ -9,7 +9,7 @@ with lib;
boot.vesa = false;
# Don't start a tty on the serial consoles.
systemd.services."serial-getty@ttyS0".enable = false;
systemd.services."serial-getty@ttyS0".enable = lib.mkDefault false;
systemd.services."serial-getty@hvc0".enable = false;
systemd.services."getty@tty1".enable = false;
systemd.services."autovt@".enable = false;

26
nixos/modules/virtualisation/amazon-image.nix
View File

@ -18,7 +18,15 @@ let
in
{
imports = [ ../profiles/headless.nix ./ec2-data.nix ./amazon-init.nix ];
imports = [
../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
./ec2-data.nix
./amazon-init.nix
];
config = {
@ -49,7 +57,7 @@ in
];
boot.initrd.kernelModules = [ "xen-blkfront" "xen-netfront" ];
boot.initrd.availableKernelModules = [ "ixgbevf" "ena" "nvme" ];
boot.kernelParams = mkIf cfg.hvm [ "console=ttyS0" "random.trust_cpu=on" ];
boot.kernelParams = mkIf cfg.hvm [ "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.
@ -63,7 +71,12 @@ in
boot.loader.grub.extraPerEntryConfig = mkIf (!cfg.hvm) "root (hd0)";
boot.loader.grub.efiSupport = cfg.efi;
boot.loader.grub.efiInstallAsRemovable = cfg.efi;
boot.loader.timeout = 0;
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
'';
boot.initrd.network.enable = true;
@ -127,15 +140,14 @@ in
copy_bin_and_libs ${pkgs.util-linux}/sbin/swapon
'';
# 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 the SSH key that the user specified
# at instance creation time.
services.openssh.enable = true;
services.openssh.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.ec2-utils ];