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Installation of NixOS with encrypted root

Installation of NixOS with encrypted root

These are my notes on instaling NixOS 16.03 on a Lenovo ThinkPad X1 Carbon (4th generation) with an encrypted root file system using UEFI.

Most of this is scrambled from the following pages:

Preparing installation media

I installed from a USB stick using the NixOS minimal ISO (this one to be precise).

$ dd bs=4M if=nixos-minimal-16.03.678.2597f52-x86_64-linux.iso of=/dev/sdb

Booting the installer

  • Disable Secure Boot Control
  • Disable USB legacy boot
  • Enable Launch CSM

Due to this kernel bug, we have to boot with the following kernel parameter: intel_pstate=no_hwp. Seems like this will be fixed soon.

Partitioning

We create a 500MB EFI boot partition (/dev/sda1) and the rest will be our LUKS encrypted physical volume for LVM (/dev/sda2).

$ gdisk /dev/sda
  • o (create new empty partition table)
  • n (add partition, 500M, type ef00 EFI)
  • n (add partition, remaining space, type 8300 Linux LVM)
  • w (write partition table and exit)

Setup the encrypted LUKS partition and open it:

$ cryptsetup luksFormat /dev/sda2
$ cryptsetup luksOpen /dev/sda2 enc-pv

We create two logical volumes, a 8GB swap parition and the rest will be our root filesystem

$ pvcreate /dev/mapper/enc-pv
$ vgcreate vg /dev/mapper/enc-pv
$ lvcreate -L 8G -n swap vg
$ lvcreate -l '100%FREE' -n root vg

Format the partitions:

$ mkfs.fat /dev/sda1
$ mkfs.ext4 -L root /dev/vg/root
$ mkswap -L swap /dev/vg/swap

Installing NixOS

We mount the partitions we just created under /mnt so we can install NixOS on them.

$ mount /dev/vg/root /mnt
$ mkdir /mnt/boot
$ mount /dev/sda1 /mnt/boot
$ swapon /dev/vg/swap

Configure WPA supplicant so we can use WIFI:

$ cat > /etc/wpa_supplicant.conf
network={
  ssid="****"
  psk="****"
}
^D
$ systemctl start wpa_supplicant

Now generate a NixOS configuration and modify it to our liking. The following is the configuration I started with.

$ nixos-generate-config --root /mnt
$ cat > /mnt/etc/nixos/configuration.nix
{ config, pkgs, ... }:

{
  imports =
    [ # Include the results of the hardware scan.
      ./hardware-configuration.nix
    ];

  # https://bugzilla.kernel.org/show_bug.cgi?id=110941
  boot.kernelParams = [ "intel_pstate=no_hwp" ];

  # Supposedly better for the SSD.
  fileSystems."/".options = [ "noatime" "nodiratime" "discard" ];

  # Use the GRUB 2 boot loader.
  boot.loader.grub.enable = true;
  boot.loader.grub.version = 2;
  boot.loader.grub.device = "nodev";
  boot.loader.grub.efiSupport = true;
  boot.loader.efi.canTouchEfiVariables = true;

  # Grub menu is painted really slowly on HiDPI, so we lower the
  # resolution. Unfortunately, scaling to 1280x720 (keeping aspect
  # ratio) doesn't seem to work, so we just pick another low one.
  boot.loader.grub.gfxmodeEfi = "1024x768";

  boot.initrd.luks.devices = [
    {
      name = "root";
      device = "/dev/disk/by-uuid/06e7d974-9549-4be1-8ef2-f013efad727e";
      preLVM = true;
      allowDiscards = true;
    }
  ];

  # Enables wireless support via wpa_supplicant.
  networking.wireless.enable = true;

  # Etcetera ...
}

If we're happy with the configuration, install NixOS and reboot.

$ nixos-install
$ reboot

Troubleshooting

If for whatever reason the system doesn't boot, we can go back to the installation environment by booting from the installation media and remounting all partitions:

$ cryptsetup luksOpen /dev/sda2 enc-pv
$ lvchange -a y /dev/vg/swap
$ lvchange -a y /dev/vg/root
$ mount /dev/vg/root /mnt
$ mount /dev/sda1 /mnt/boot
$ swapon /dev/vg/swap
$ cp /mnt/etc/wpa_supplicant.conf /etc
$ systemctl start wpa_supplicant

We can now make further modifications to the configuration and try again.

@pradeepcheers

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commented Oct 10, 2016

Hi,
Where did you get this value from "/dev/disk/by-uuid/**06e7d974-9549-4be1-8ef2-f013efad727e**"? I'm using /dev/sda2 instead but it didn't work. I tried getting the uuid from the command ``blkid /dev/sda2`.

On nixos-install the installation is successful but on reboot the installation is saving to the boot partition. All the configuration is lost and I have to start over again with the bootable pen drive!

Any help is much appreciated. Thanks

@offlinehacker

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commented Dec 17, 2016

Thanks!

@jtojnar

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commented Jun 30, 2017

@prapradeepcheers Using the UUID returned by blkid /dev/sda2 worked for me.

@jb55

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commented Jul 21, 2017

boot.kernelParams = [ "intel_pstate=no_hwp" ];

wasn't needed for me on my gen5 / nixos-unstable

@ahstro

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commented Oct 26, 2017

For who it may concern: nixos-generate-config --root /mnt generated

{
  boot.loader.systemd-boot.enable = true;
  boot.loader.efi.canTouchEfiVariables = true;
}

instead of the GRUB 2 related config for me, and it works fine.

Edit: Also, thanks for this gist! ❤️

@MrRacoon

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commented Nov 3, 2017

Worked Beautifully, Thank you so much

@phdoerfler

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commented Nov 3, 2017

The hex code for Linux LVM partitions seems to be 8e00 and not 8300.

@andersk

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commented Dec 2, 2017

@phdoerfler Beware, using 8e00 “Linux LVM” for an LUKS-encrypted LVM partition might confuse the Debian installer into destroying your partition in certain circumstances! In the apparent absence of a dedicated LUKS code, I went for 8301 “Linux reserved”.

By the way, the EFI spec requires the EFI system partition to be FAT32, not FAT16, so you may want mkfs.fat -F 32 /dev/sda1. (Some implementations seem to allow FAT16, but not all of them.)

@ladinu

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commented Jan 8, 2018

Thank you for this! Really helped me out.

I wrote a guide where /boot is also encrypted and single password unlock for multiple devices

@concatime

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commented Jan 13, 2018

wpa_passphrase SSID PASSWORD >/etc/wpa_supplicant.conf should be better ;)

@FintanH

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commented Feb 16, 2018

I wasn't sure how to connect to WiFi at first which meant nixos-install wasn't able to complete.

To solve this I ran: nmcli dev wifi connect <mySSID> password <myPassword> :)

@dbwest

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commented Mar 22, 2018

I have a Lenovo Legion Y520. To get the wireless working for the installer on boot off USB drive I pressed F1 at the boot menu for the live installation, chose 'e' to edit the boot options and added modprobe.blacklist=ideapad_laptop. Fixes rfkill always listing wifi as hard blocked and wifi just works after that :)

@baroncharlus

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commented Apr 3, 2018

thanks for this!

@flyx

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commented Jun 17, 2018

In case someone wants to do this with legacy BIOS boot:

  • when partitioning, add a 1M BIOS Boot partition (ef02) in front of everything else. GRUB needs this partition on GPT. Create the /boot partition with 8300 instead of ef00.
  • /boot will be on /dev/sda2 and the encrypted partitions on /dev/sda3, change the commands accordingly.
  • You can format /boot with mkfs.ext2 instead of mkfs.fat.
  • boot.loader.grub.device should be "/dev/sda". remove the *efi* lines.
@ehtasham

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commented Jul 29, 2018

I am having the same issue as @pradeepcheers, All the configuration is lost when i reboot it. i am installing it on virtual box. Can anyone suggest a solution.

@sfultong

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commented Oct 15, 2018

I've been using this method successfully for 18.03. One odd thing is that asked me for my password twice and tried to mount root twice.

In 18.09 it also asks me for my password twice, but fails after the second time because root is already mounted.

edit:

Fixed. The luks device was listed both in hardware-configuration.nix and configuration.nix so I just commented one out.

@michelrandahl

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commented Dec 11, 2018

If you have problems installing nixos with a 18.09 image, then try to install it using a 17.09 image instead and then upgrade to 18.09 post installation.

I used many hours this weekend trying to install nixos on my machine using a 18.09 image. I had no problems installing it, and the boot loader worked fine, but after that I just got a black screen. I tried many permutations of nixos-configurations and BIOS-configurations. Nothing seemed to work. Not even a plain installation with no luks encryption. At last I downloaded a 17.09 image and performed the installation with no trouble at all. Today I upgraded my system from 17.09 to 18.09 smoothly with no problems as well (change the nixos nix-channel to 18.09 and do the usual nixos-rebuild switch).

I could not find any 'official' nixos site with old images, so I downloaded it from distrowatch https://distrowatch.com/?newsid=09979

Hope this helps some other poor soul, so that my countless wasted hours haven't been wasted for nothing :)

@Akii

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commented May 5, 2019

@flyx Thank you!

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