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# Preinstallation NixOS
Acquire [Nix or NixOS](https://nixos.org/download.html) ([AArch64 22.05 ISO](https://hydra.nixos.org/job/nixos/release-22.05-aarch64/nixos.iso_minimal.aarch64-linux))
## If you're using Nix from another distro
As root, logout and back in as prompted and then acquire installation tools and git, and setup the correct channel:
nix-shell -p nixos-install-tools git
nix-channel --remove nixpkgs
nix-channel --add https://nixos.org/channels/nixos-22.05 nixos
nix-channel --update
## If you're using NixOS installation media
Acquire git: `nix-shell -p git`
# Format Disks
Format disks according to the [UEFI guide](https://nixos.org/manual/nixos/stable/index.html#sec-installation-partitioning-UEFI)
For the AArch64 machines we have boot on `nvme0n1p1`, and root on RAID0 `nvme[01]n1p3`:
# lsblk
NAME MAJ:MIN RM SIZE RO TYPE MOUNTPOINTS
nvme1n1 259:0 0 894.3G 0 disk
├─nvme1n1p1 259:2 0 1G 0 part
└─nvme1n1p2 259:3 0 893.3G 0 part
└─md127 9:127 0 1.7T 0 raid0 /nix/store
/
nvme0n1 259:1 0 894.3G 0 disk
├─nvme0n1p1 259:4 0 1G 0 part /boot
└─nvme0n1p2 259:5 0 893.3G 0 part
└─md127 9:127 0 1.7T 0 raid0 /nix/store
/
# System setup
Read **BUT DO NOT RUN**, the installation steps in the [manual](https://nixos.org/manual/nixos/stable/index.html#sec-installation-installing).
Mount the partitions as steps 1-3 instruct.
Clone our repo in to `/etc/nixos` on the target machine:
cd /mnt
mkdir -p etc
mkdir -p tmp # needed for a bug in the installer
git clone https://github.com/YellowOnion/nixos-test-farm.git nixos
cd etc/nixos
Run our custom setup script (this automates `nixos-generate-config`):
./setup.sh <new HostName for machine>
given the command `./setup.sh farm2` this will create 2 files, `farm2.nix` `farm2-hw.nix`, and symlink those to `configuration.nix` and `hardware-configuration.nix` respectively. `farm.nix` will have `common.nix` imported, and host name set.
`common.nix` comes with a bunch of tools and ssh keys setup for root make changes if needed.
# Installation
Run
nixos-install --no-root-passwd && poweroff --reboot
# the flag is optional but but the installer will
# prompt for root password before rebooting otherwise.
# Troubleshooting
If the install process doesn't work or after a system update something broke for what ever reason follow steps skipping the disk format and cloning, make sure you mount boot in `/mnt/boot`, make your fixes and re-run `setup.sh` if you made any hardware changes, and finally rerun the installation process, this will repair your OS.
# Postinstall
TODO
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