add hetzner dedicated install script
parent
9e16469f80
commit
a34de3739a
GPG Key ID:
76BF5F1928B9618B
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#!/usr/bin/env bash
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# Installs NixOS on a Hetzner server, wiping the server.
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#
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# This is for a specific server configuration; adjust where needed.
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#
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# Prerequisites:
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# * Update the script wherever FIXME is present
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#
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# Usage:
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# ssh root@YOUR_SERVERS_IP bash -s < hetzner-dedicated-wipe-and-install-nixos.sh
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#
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# When the script is done, make sure to boot the server from HD, not rescue mode again.
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# Explanations:
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#
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# * Adapted from https://gist.github.com/nh2/78d1c65e33806e7728622dbe748c2b6a
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# * Following largely https://nixos.org/nixos/manual/index.html#sec-installing-from-other-distro.
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# * **Important:** We boot in legacy-BIOS mode, not UEFI, because that's what Hetzner uses.
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# * NVMe devices aren't supported for booting (those require EFI boot)
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# * We set a custom `configuration.nix` so that we can connect to the machine afterwards,
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# inspired by https://nixos.wiki/wiki/Install_NixOS_on_Hetzner_Online
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# * This server has 2 HDDs.
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# We put everything on RAID1.
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# Storage scheme: `partitions -> RAID -> LVM -> ext4`.
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# * A root user with empty password is created, so that you can just login
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# as root and press enter when using the Hetzner spider KVM.
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# Of course that empty-password login isn't exposed to the Internet.
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# Change the password afterwards to avoid anyone with physical access
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# being able to login without any authentication.
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# * The script reboots at the end.
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# * does not use uefi (check if you can : efibootmgr)
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# Notes https://mazzo.li/posts/hetzner-zfs.html
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# FIXME : change password
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MAIN_PASSWORD="KlEBgwLgksT71cfIixM3eNDjIaZgFFvMDY8EoBs1Il"
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set -eu
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set -o pipefail
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set -x
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# Inspect existing disks
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lsblk
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# Undo existing setups to allow running the script multiple times to iterate on it.
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# We allow these operations to fail for the case the script runs the first time.
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set +e
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umount /mnt/boot-{1,2}
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umount /mnt
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vgchange -an
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cryptsetup close a_encrypted
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cryptsetup close b_encrypted
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set -e
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# Stop all mdadm arrays that the boot may have activated.
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mdadm --stop --scan
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# Prevent mdadm from auto-assembling arrays.
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# Otherwise, as soon as we create the partition tables below, it will try to
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# re-assemple a previous RAID if any remaining RAID signatures are present,
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# before we even get the chance to wipe them.
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# From:
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# https://unix.stackexchange.com/questions/166688/prevent-debian-from-auto-assembling-raid-at-boot/504035#504035
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# We use `>` because the file may already contain some detected RAID arrays,
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# which would take precedence over our `<ignore>`.
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echo 'AUTO -all
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ARRAY <ignore> UUID=00000000:00000000:00000000:00000000' > /etc/mdadm/mdadm.conf
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# Create partition tables (--script to not ask)
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#parted --script /dev/sda mklabel gpt
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#parted --script /dev/sdb mklabel gpt
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#parted /dev/sda -- mklabel gpt
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#parted /dev/sda -- mkpart ESP fat32 1MiB 512MiB
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#parted /dev/sda -- set 1 boot on
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#parted /dev/sda -- mkpart primary 512MiB 100%
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format() {
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parted -s "$1" -- mklabel gpt
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parted -s "$1" -- mkpart 'BIOS-boot-partition' 1MB 2MB set 1 bios_grub on
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#parted -s "$1" -- mkpart 'boot' 2MB 512MiB
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#parted -s "$1" -- mkpart ESP fat32 2MB 512MiB
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parted -s "$1" -- mkpart ESP fat32 2MB 512MiB set 2 boot on
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#parted -s "$1" -- mkpart ESP fat32 1MiB 512MiB
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parted -s "$1" -- mkpart primary 512MiB 100%
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parted -s "$1" -- print
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}
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# In this particular machine we have two NVMe disks
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format /dev/sda
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format /dev/sdb
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# Create partitions (--script to not ask)
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#
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# We create the 1MB BIOS boot partition at the front.
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#
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# Note we use "MB" instead of "MiB" because otherwise `--align optimal` has no effect;
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# as per documentation https://www.gnu.org/software/parted/manual/html_node/unit.html#unit:
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# > Note that as of parted-2.4, when you specify start and/or end values using IEC
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# > binary units like "MiB", "GiB", "TiB", etc., parted treats those values as exact
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#
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# Note: When using `mkpart` on GPT, as per
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# https://www.gnu.org/software/parted/manual/html_node/mkpart.html#mkpart
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# the first argument to `mkpart` is not a `part-type`, but the GPT partition name:
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# ... part-type is one of 'primary', 'extended' or 'logical', and may be specified only with 'msdos' or 'dvh' partition tables.
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# A name must be specified for a 'gpt' partition table.
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# GPT partition names are limited to 36 UTF-16 chars, see https://en.wikipedia.org/wiki/GUID_Partition_Table#Partition_entries_(LBA_2-33).
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#parted --script --align optimal /dev/sda -- mklabel gpt mkpart 'BIOS-boot-partition' 1MB 2MB set 1 bios_grub on mkpart 'data-partition' 2MB '100%'
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#parted --script --align optimal /dev/sdb -- mklabel gpt mkpart 'BIOS-boot-partition' 1MB 2MB set 1 bios_grub on mkpart 'data-partition' 2MB '100%'
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# Relaod partitions
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#partprobe
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# Wait for all devices to exist
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udevadm settle --timeout=5 --exit-if-exists=/dev/sda1
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udevadm settle --timeout=5 --exit-if-exists=/dev/sda2
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udevadm settle --timeout=5 --exit-if-exists=/dev/sda3
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udevadm settle --timeout=5 --exit-if-exists=/dev/sdb1
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udevadm settle --timeout=5 --exit-if-exists=/dev/sdb2
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udevadm settle --timeout=5 --exit-if-exists=/dev/sdb3
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# Wipe any previous RAID signatures
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#mdadm --zero-superblock --force /dev/sda2
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#mdadm --zero-superblock --force /dev/sdb2
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# Create RAIDs
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# Note that during creating and boot-time assembly, mdadm cares about the
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# host name, and the existence and contents of `mdadm.conf`!
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# This also affects the names appearing in /dev/md/ being different
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# before and after reboot in general (but we take extra care here
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# to pass explicit names, and set HOMEHOST for the rebooting system further
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# down, so that the names appear the same).
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# Almost all details of this are explained in
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# https://bugzilla.redhat.com/show_bug.cgi?id=606481#c14
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# and the followup comments by Doug Ledford.
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#mdadm --create --run --verbose /dev/md0 --level=1 --raid-devices=2 --homehost=hetzner --name=root0 /dev/sda2 /dev/sdb2
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# Assembling the RAID can result in auto-activation of previously-existing LVM
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# groups, preventing the RAID block device wiping below with
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# `Device or resource busy`. So disable all VGs first.
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#vgchange -an
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# Wipe filesystem signatures that might be on the RAID from some
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# possibly existing older use of the disks (RAID creation does not do that).
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# See https://serverfault.com/questions/911370/why-does-mdadm-zero-superblock-preserve-file-system-information
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#wipefs -a /dev/md0
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# Disable RAID recovery. We don't want this to slow down machine provisioning
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# in the rescue mode. It can run in normal operation after reboot.
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echo 0 > /proc/sys/dev/raid/speed_limit_max
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# LVM
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encrypt() {
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device=$1
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label=$2
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echo $MAIN_PASSWORD | cryptsetup luksFormat ${device}3 -
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echo $MAIN_PASSWORD | cryptsetup --key-file - open --type luks ${device}3 ${label}_encrypted
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}
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encrypt /dev/sda "a"
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encrypt /dev/sdb "b"
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# PVs
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#pvcreate /dev/md0
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pvcreate /dev/mapper/a_encrypted
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pvcreate /dev/mapper/b_encrypted
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# VGs
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vgcreate vg /dev/mapper/a_encrypted /dev/mapper/b_encrypted
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#vgcreate vg0 /dev/md0
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# LVs (--yes to automatically wipe detected file system signatures)
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# the root partition should be raid1
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#lvcreate --mirrors 1 --type raid1 -L 150G --nosync -n root vg
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lvcreate --mirrors 1 --type raid1 -L 150G -n root vg
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# Filesystems (-F to not ask on preexisting FS)
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mkfs.ext4 -F -L root /dev/mapper/vg-root
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#mkfs.ext4 -F -L boot /dev/sda2
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mkfs.fat -F 32 -n boot /dev/sda2
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#mkfs.vfat -n boot /dev/sda2
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#mkfs.ext4 -F -L boot /dev/sdb2
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mkfs.fat -F 32 -n boot /dev/sdb2
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#mkfs.vfat -n boot /dev/sdb2
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# Creating file systems changes their UUIDs.
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# Trigger udev so that the entries in /dev/disk/by-uuid get refreshed.
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# `nixos-generate-config` depends on those being up-to-date.
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# See https://github.com/NixOS/nixpkgs/issues/62444
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udevadm trigger
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# Wait for FS labels to appear
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udevadm settle --timeout=5 --exit-if-exists=/dev/disk/by-label/root
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# NixOS pre-installation mounts
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# Mount target root partition
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mount /dev/disk/by-label/root /mnt
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mkdir -p /mnt/boot-{1,2}
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modprobe vfat
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mount /dev/sda2 /mnt/boot-1
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mount /dev/sdb2 /mnt/boot-2
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# Installing nix
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# Installing nix requires `sudo`; the Hetzner rescue mode doesn't have it.
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apt-get install -y sudo
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# Allow installing nix as root, see
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# https://github.com/NixOS/nix/issues/936#issuecomment-475795730
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mkdir -p /etc/nix
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echo "build-users-group =" > /etc/nix/nix.conf
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curl -L https://nixos.org/nix/install | sh
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set +u +x # sourcing this may refer to unset variables that we have no control over
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. $HOME/.nix-profile/etc/profile.d/nix.sh
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set -u -x
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# FIXME Keep in sync with `system.stateVersion` set below!
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nix-channel --add https://nixos.org/channels/nixos-21.05 nixpkgs
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nix-channel --update
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# Getting NixOS installation tools
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nix-env -iE "_: with import <nixpkgs/nixos> { configuration = {}; }; with config.system.build; [ nixos-generate-config nixos-install nixos-enter manual.manpages ]"
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nixos-generate-config --root /mnt
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# Find the name of the network interface that connects us to the Internet.
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# Inspired by https://unix.stackexchange.com/questions/14961/how-to-find-out-which-interface-am-i-using-for-connecting-to-the-internet/302613#302613
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RESCUE_INTERFACE=$(ip route get 8.8.8.8 | grep -Po '(?<=dev )(\S+)')
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# Find what its name will be under NixOS, which uses stable interface names.
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# See https://major.io/2015/08/21/understanding-systemds-predictable-network-device-names/#comment-545626
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# NICs for most Hetzner servers are not onboard, which is why we use
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# `ID_NET_NAME_PATH`otherwise it would be `ID_NET_NAME_ONBOARD`.
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INTERFACE_DEVICE_PATH=$(udevadm info -e | grep -Po "(?<=^P: )(.*${RESCUE_INTERFACE})")
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UDEVADM_PROPERTIES_FOR_INTERFACE=$(udevadm info --query=property "--path=$INTERFACE_DEVICE_PATH")
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NIXOS_INTERFACE=$(echo "$UDEVADM_PROPERTIES_FOR_INTERFACE" | grep -o -E 'ID_NET_NAME_PATH=\w+' | cut -d= -f2)
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echo "Determined NIXOS_INTERFACE as '$NIXOS_INTERFACE'"
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#NIXOS_INTERFACE='eth0'
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IP_V4=$(ip route get 8.8.8.8 | grep -Po '(?<=src )(\S+)')
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echo "Determined IP_V4 as $IP_V4"
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# Determine Internet IPv6 by checking route, and using ::1
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# (because Hetzner rescue mode uses ::2 by default).
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# The `ip -6 route get` output on Hetzner looks like:
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# # ip -6 route get 2001:4860:4860:0:0:0:0:8888
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# 2001:4860:4860::8888 via fe80::1 dev eth0 src 2a01:4f8:151:62aa::2 metric 1024 pref medium
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IP_V6="$(ip route get 2001:4860:4860:0:0:0:0:8888 | head -1 | cut -d' ' -f7 | cut -d: -f1-4)::1"
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echo "Determined IP_V6 as $IP_V6"
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# From https://stackoverflow.com/questions/1204629/how-do-i-get-the-default-gateway-in-linux-given-the-destination/15973156#15973156
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read _ _ DEFAULT_GATEWAY _ < <(ip route list match 0/0); echo "$DEFAULT_GATEWAY"
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echo "Determined DEFAULT_GATEWAY as $DEFAULT_GATEWAY"
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# Generate `configuration.nix`. Note that we splice in shell variables.
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cat > /mnt/etc/nixos/configuration.nix <<EOF
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{ config, pkgs, modulesPath, lib, ... }:
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let
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hostName = "hetzner";
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# in rescue
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# apt install -y lshw
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# lshw -C network | grep -Poh 'driver=[[:alnum:]]+'
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networkInterfaceModule = "r8169";
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networkInterface = "$NIXOS_INTERFACE";
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# From the Hetzner control panel
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ipv4 = {
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address = "$IP_V4"; # the ip address
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gateway = "$DEFAULT_GATEWAY"; # the gateway ip address
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netmask = "255.255.255.224"; # the netmask -- might not be the same for you!
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prefixLength = 27; # must match the netmask, see <https://www.pawprint.net/designresources/netmask-converter.php>
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};
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ipv6 = {
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address = "$IP_V6"; # the ipv6 addres
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gateway = "fe80::1"; # the ipv6 gateway
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prefixLength = 64; # shown in the control panel
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};
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in
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{
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imports =
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[ # Include the results of the hardware scan.
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# ./hardware-configuration.nix
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# hardware-configuration content
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{
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imports =
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[ (modulesPath + "/installer/scan/not-detected.nix")
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];
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boot.initrd.availableKernelModules = [ "ahci" "sd_mod" ];
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boot.initrd.kernelModules = [ "dm-snapshot" ];
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boot.kernelModules = [ "kvm-intel" ];
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boot.extraModulePackages = [ ];
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swapDevices = [ ];
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powerManagement.cpuFreqGovernor = lib.mkDefault "ondemand";
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}
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];
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# Use GRUB2 as the boot loader.
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# We don't use systemd-boot because Hetzner uses BIOS legacy boot.
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boot.loader.systemd-boot.enable = false;
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boot.loader.grub = {
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enable = true;
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efiSupport = false;
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version = 2;
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};
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# This will mirror all UEFI files, kernels, grub menus and
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# things needed to boot to the other drive.
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boot.loader.grub.mirroredBoots = [
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{ path = "/boot-1"; devices = [ "/dev/sda" ]; }
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{ path = "/boot-2"; devices = [ "/dev/sdb" ]; }
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];
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# add later
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# fileSystems."/boot-1".options = [ "nofail" ];
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# fileSystems."/boot-2".options = [ "nofail" ];
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boot.initrd.luks.devices = {
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a_encrypted = {
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device = "/dev/sda3";
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preLVM = true;
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};
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b_encrypted = {
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device = "/dev/sdb3";
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preLVM = true;
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};
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};
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# root
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# ----
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fileSystems."/" = {
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options = [ "noatime" "nodiratime" "discard" ];
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device = "/dev/vg/root";
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fsType = "ext4";
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};
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networking.hostName = hostName;
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# Network configuration (Hetzner uses static IP assignments, and we don't use DHCP here)
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networking.useDHCP = false;
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networking.interfaces.\${networkInterface} = {
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ipv4 = { addresses = [{ address = ipv4.address; prefixLength = ipv4.prefixLength; }]; };
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ipv6 = { addresses = [{ address = ipv6.address; prefixLength = ipv6.prefixLength; }]; };
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};
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networking.defaultGateway = ipv4.gateway;
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networking.defaultGateway6 = { address = ipv6.gateway; interface = networkInterface; };
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networking.nameservers = [ "8.8.8.8" ];
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# Initial empty root password for easy login:
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users.users.root.initialHashedPassword = "";
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services.openssh.permitRootLogin = "prohibit-password";
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users.users.root.openssh.authorizedKeys.keys = [
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# FIXME : add ssh key
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"ssh-rsa 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"
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];
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services.openssh.enable = true;
|
||||
|
||||
system.stateVersion = "21.05";
|
||||
|
||||
# enable ssh on init
|
||||
# ------------------
|
||||
boot.kernelParams = [
|
||||
# See <https://www.kernel.org/doc/Documentation/filesystems/nfs/nfsroot.txt> for docs on this
|
||||
# ip=<client-ip>:<server-ip>:<gw-ip>:<netmask>:<hostname>:<device>:<autoconf>:<dns0-ip>:<dns1-ip>:<ntp0-ip>
|
||||
# The server ip refers to the NFS server -- we don't need it.
|
||||
"ip=\${ipv4.address}::\${ipv4.gateway}:\${ipv4.netmask}:\${hostName}-initrd:\${networkInterface}:off:8.8.8.8"
|
||||
];
|
||||
boot.initrd.availableKernelModules = [ networkInterfaceModule ];
|
||||
boot.initrd.network.enable = true;
|
||||
boot.initrd.network.ssh = {
|
||||
enable = true;
|
||||
authorizedKeys = config.users.users.root.openssh.authorizedKeys.keys;
|
||||
port = 22;
|
||||
hostKeys = [
|
||||
/etc/secrets/initrd/ssh_host_rsa_key
|
||||
/etc/secrets/initrd/ssh_host_ed25519_key
|
||||
];
|
||||
|
||||
};
|
||||
|
||||
|
||||
# make sure ip address is set after in initrd
|
||||
#boot.initrd.network.postCommands = ''
|
||||
# up ip addr add $IP_V4/32 dev eth0
|
||||
# #ip address add $IP_V4/32 dev eth0
|
||||
# #ip link set eth0 up
|
||||
# #ip address add $IP_V4/32 dev $NIXOS_INTERFACE
|
||||
# #ip link set eth0 up
|
||||
#'';
|
||||
|
||||
|
||||
}
|
||||
EOF
|
||||
|
||||
|
||||
mkdir -p /mnt/etc/secrets/initrd/
|
||||
|
||||
ssh-keygen -t rsa -N "" -f /mnt/etc/secrets/initrd/ssh_host_rsa_key
|
||||
ssh-keygen -t ed25519 -N "" -f /mnt/etc/secrets/initrd/ssh_host_ed25519_key
|
||||
|
||||
|
||||
# Install NixOS
|
||||
#PATH="$PATH" NIX_PATH="$NIX_PATH" `which nixos-install` --no-root-passwd --root /mnt --max-jobs 40
|
||||
PATH="$PATH" `which nixos-install` --no-root-passwd --root /mnt --max-jobs 40
|
||||
|
||||
umount /mnt/boot-{1,2}
|
||||
umount /mnt
|
||||
|
||||
echo "Determined NIXOS_INTERFACE as '$NIXOS_INTERFACE'"
|
||||
echo "Determined IP_V4 as $IP_V4"
|
||||
echo "Determined IP_V6 as $IP_V6"
|
||||
echo "Determined DEFAULT_GATEWAY as $DEFAULT_GATEWAY"
|
||||
reboot
|
||||
Loading…
Reference in New Issue