# NixOS LAN Configurations

Flake-based NixOS configuration repository for Wayne's LAN servers and
workstation.

## Hosts

This flake currently defines:

| Host | Purpose |
| --- | --- |
| `nixos` | Main NixOS workstation / Cinnamon desktop |
| `docker` | Docker host for the main container stack |
| `kuma` | Docker-enabled Uptime Kuma style host |
| `server` | Storage, NFS, backup, and monitoring exporter host |
| `nix-cache` | Local Nix binary cache and remote builder |
| `nix-minimal` | Minimal NixOS host profile with SSHFS tooling |
| `pxe-boot` | HTTP/iPXE boot asset host |

List hosts with:

```bash
nix eval --json .#nixosConfigurations --apply builtins.attrNames | jq -r '.[]'
```

## Layout

| Path | Purpose |
| --- | --- |
| `flake.nix` | Flake inputs and `nixosConfigurations` outputs |
| `hosts/<host>/configuration.nix` | Host-specific NixOS configuration |
| `hosts/nixos/home.nix` | Workstation-specific Home Manager config |
| `common/` | Shared NixOS, Home Manager, aliases, and hardware config |
| `modules/nix/` | Binary cache and remote builder client/server modules |
| `docs/` | Operational notes for cache, builders, lock updates, and boot services |
| `scripts/` | Codex setup and validation helpers |

## Validation

Safe validation commands for Codex and local review:

```bash
bash scripts/codex-setup.sh
bash scripts/codex-maintenance.sh dry-run
bash scripts/codex-maintenance.sh
```

For individual host evaluation:

```bash
nix eval .#nixosConfigurations.<host>.config.system.build.toplevel.drvPath --raw
```

Use `nix build --dry-run --no-link` when build planning is needed. Do not run
deployment, install, disk formatting, mount, or reboot commands from automated
review sessions.

## Operations

- Host rebuilds should consume the committed `flake.lock`.
- Routine dependency updates should happen through the flake lock automation
  described in `docs/flake-lock-automation.md`.
- `nix-cache` serves substitutes over HTTP and can act as a remote builder for
  client hosts.
- `pxe-boot` serves iPXE boot files over HTTP from `/srv/pxe`.

## Security Notes

Do not commit tokens, private keys, live credentials, or new password hashes.
This repository currently contains committed password hashes in shared NixOS
configuration; rotate those passwords and move hashes into host-local secret
management before treating the repository as public or widely shared.