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content: Add note for installing NixOS on Btrfs

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Signed-off-by: Christoph Heiss <christoph@c8h4.io>
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Christoph Heiss 2023-10-17 23:53:35 +02:00
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---
title: nixos btrfs install guide
date: 2023-10-14T00:15:29+02:00
---
## BIOS, single partition (for VMs)
### first, create a new MBR partition table and a single partition
```shell {lineanchors=list}
$ fdisk /dev/vdX
fdisk> o
fdisk> n
# enter, enter, enter, enter
# primary partition, number 1, from sector 2048 to end
fdisk> w
```
### create a new Btrfs on the new partition
```shell {lineanchors=list}
$ mkfs.btrfs -L nixos /dev/vdX1
```
### create all the subvolumes
```shell {lineanchors=list}
$ mount /dev/vdX1 /mnt
$ btrfs subvolume create /mnt/@
$ btrfs subv cr /mnt/@boot
$ btrfs subv cr /mnt/@home
$ btrfs subv cr /mnt/@nix
$ btrfs subv cr /mnt/@log
$ umount /mnt
```
### Mount the Btrfs again, now properly with the subvolumes
```shell {lineanchors=list}
$ mount -o noatime,subvol=@ /dev/disk/by-uuid/<uuid> /mnt
$ mkdir -p /mnt/{boot,home,nix,var/log}
$ mount -o noatime,subvol=@boot /dev/disk/by-uuid/<uuid> /mnt/boot
$ mount -o subvol=@home /dev/disk/by-uuid/<uuid> /mnt/home
$ mount -o noatime,compress=zstd,subvol=@nix /dev/disk/by-uuid/<uuid> /mnt/nix
$ mount -o noatime,compress=zstd,subvol=@log /dev/disk/by-uuid/<uuid> /mnt/var/log
```
## rest of the installation
### generate the initial NixOS system config
```shell {lineanchors=list}
$ nixos-generate-config --root /mnt
```
### review & modify system config
Here one should set the root password and enable SSH access, at least.
Other things can be changed as necessary.
Don't forget to set `services.openssh.settings.PermitRootLogin = "yes";`!
```shell {lineanchors=list}
$ vim /mnt/etc/nixos/configuration.nix
$ vim /mnt/etc/nixos/hardware-configuration.nix
```
### complete the installation
```shell {lineanchors=list}
$ cd /mnt
$ nixos-install
```
### perform the first deployment after the install using morph
```shell {lineanchors=list}
$ SSH_USER=root morph deploy --passwd --on <host> ./default.nix switch
```