https://github.com/raehik/nixos-cfgs

my NixOS system configs
https://github.com/raehik/nixos-cfgs

Last synced: about 2 months ago
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my NixOS system configs

• Host: GitHub
• URL: https://github.com/raehik/nixos-cfgs
• Owner: raehik
• Created: 2023-03-03T17:34:51.000Z (almost 2 years ago)
• Default Branch: main
• Last Pushed: 2024-09-17T15:06:30.000Z (4 months ago)
• Last Synced: 2024-09-17T18:55:28.688Z (4 months ago)
• Language: Nix
• Homepage:
• Size: 99.6 KB
• Stars: 2
• Watchers: 3
• Forks: 0
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# raehik's NixOS system configurations

I don't know much about Nix yet. This is my initial barebones system

configuration wrapped into a flake. home-manager exists, but isn't used very

much.

## Deleting old generations

```

sudo nix-collect-garbage -d

sudo nixos-rebuild boot --flake .

```

`nixos-rebuild` figure out `/boot`. It's stupid and annoying, sorry.

## Initalizing a new system

Once your drive is prepped and mounted:

`sudo nixos-install --flake .# --root `

Note that Nix is smart enough to use its local store! (That blew my mind a bit.)

Remember to fiddle with Lanzaboote if you're using it. Go systemd-boot first,

then swap to Lanzaboote module.

`cryptsetup status ` helps assert some config.

### Drive

For NVMe SSDs, consider setting the LBA format to 4096 bytes. This should give

better performance.

Check with `sudo nvme id-ns -H `. Look for "LBA Format".

Note that as of 2023-12-03, nvme-cli won't work with a drive plugged in via a

USB enclosure. M.2 slot it and run Linux via another drive.

On 2023-12-03, raehik had a drive that reported it could handle 4k LBA size

(though both it and 512-byte were stated "best"), but he got a 0x2001 invalid

opcode error on trying. Seems that lots of drives are just shit.

### Device

512 MB EFI partition, rest for LUKS.

`mkfs.fat -F 32 `

### Filesystem

Currently suggesting BTRFS.

#### BTRFS

On 2023-12-03, when raehik BTRFS formatted an NVMe SSD via an USB enclosure, it

showed no for "SSD Detected" after formatting. Some defaults used to change for

SSDs. From what I could see, no more, so maybe it's a some vestigial field,

written but not read. Unsure.

```

mkfs.btrfs 

mount  /mnt

btrfs subvolume create /mnt/root

btrfs subvolume create /mnt/nix

btrfs subvolume create /mnt/home

umount /mnt

mount -o compress=zstd,subvol=root  /mnt

sudo mkdir /mnt/{nix,home}

mount -o compress=zstd,subvol=nix,noatime  /mnt/nix

mount -o compress=zstd,subvol=home  /mnt/home

# ...

```

No relevant options for filesystem or subvolume creation. (All happens on

mount.)