Archived
beatzaplentyandClaude Sonnet 5
eadb1e35ce
One file (variables.nix) holding every value that was previously hardcoded and repeated across modules: LAN domain/CIDR, home/tailnet domains, cross-host references (nix-cache substituter hostname, NFS server hostname, remote-builder user), PXE/PBS IPs, timezone, and the primary username. Wired in via flake.nix's specialArgs (and home-manager's extraSpecialArgs for the two home.nix files), so any module picks it up by just adding `vars` to its function arguments — no explicit import needed. Two hosts (nix-cache, server) now derive their own networking.hostName from the same variable other hosts use to reach them, so there's exactly one place to change either identifier. Purely mechanical: every substituted value matches what was already there, confirmed by identical toplevel .drv paths for all 17 targets before and after. Co-Authored-By: Claude Sonnet 5 <noreply@anthropic.com>
112 lines
5.5 KiB
Markdown
112 lines
5.5 KiB
Markdown
# NixOS LAN Configurations
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Flake-based NixOS configuration repository for Wayne's LAN servers and
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workstation.
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## Hosts
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Targets are named `<platform>-<buildtype>`, generated from two orthogonal
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pieces composed in `flake.nix`:
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- **Platforms** (what it runs on): `linode`, `proxmox`, `lxc`
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- **Build types** (what it's for): `minimal`, `nix-cache`, `server`, `docker`,
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`gui`, `pxe-boot`
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Not every combination exists — `pxe-boot` has no `linode` variant, since
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PXE/DHCP/TFTP need LAN L2 adjacency that a Linode VPS doesn't have. The full
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list:
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| Target | Purpose |
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| --- | --- |
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| `linode-minimal` | Minimal NixOS host profile on a Linode VPS (real, deployed) |
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| `proxmox-minimal` | Minimal NixOS host profile on Proxmox (real, deployed — previously the flat `nix-minimal` target) |
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| `lxc-minimal` | Minimal NixOS host profile in a Proxmox LXC container |
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| `linode-nix-cache` / `proxmox-nix-cache` / `lxc-nix-cache` | Local Nix binary cache and remote builder (`proxmox-nix-cache` is the real, deployed one — previously the flat `nix-cache` target) |
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| `linode-server` / `proxmox-server` / `lxc-server` | Storage, NFS, backup, and monitoring exporter host (`proxmox-server` is the real, deployed one — previously the flat `server` target) |
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| `linode-docker` / `proxmox-docker` / `lxc-docker` | Docker host for the main container stack (`proxmox-docker` is the real, deployed one — previously the flat `docker` target) |
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| `linode-gui` / `proxmox-gui` / `lxc-gui` | Cinnamon desktop workstation (`proxmox-gui` is the real, deployed one — previously the flat `nixos` target) |
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| `proxmox-pxe-boot` / `lxc-pxe-boot` | HTTP/iPXE boot asset host (`proxmox-pxe-boot` is the real, deployed one — previously the flat `pxe-boot` target) |
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Each buildtype's `hosts/<name>/host.nix` carries the per-machine identity
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(hostname, hostId, per-machine secrets, `system.stateVersion`) that must stay
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fixed regardless of which platform it's built for — see
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`flake-target-refactor-spec.md` for the full rationale. Every deployed host
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stamps its own active target name into `/etc/flake-target` at build time, so
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`nixos-rebuild switch --flake .#$(cat /etc/flake-target)` always picks up the
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right one even after a platform migration changes the flake attribute name.
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List hosts with:
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```bash
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nix eval --json .#nixosConfigurations --apply builtins.attrNames | jq -r '.[]'
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```
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## Layout
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| Path | Purpose |
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| --- | --- |
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| `flake.nix` | Flake inputs, the `mkTarget` platform × build-type generator, and `nixosConfigurations` outputs |
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| `variables.nix` | Single source of truth for shared values (LAN domain/CIDR, hostnames, timezone, primary username, storage root, ...) — passed to every module and Home Manager config as the `vars` argument via `specialArgs`/`extraSpecialArgs` |
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| `hosts/<name>/host.nix` | Per-machine identity: hostname, hostId, per-machine secrets, `system.stateVersion` |
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| `hosts/nixos/home.nix` | Workstation-specific Home Manager config (used by the `gui` build type) |
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| `modules/platforms/` | Platform-specific config: virtualisation guest tools, boot method, hardware config (`linode.nix`, `proxmox.nix`, `lxc.nix`) |
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| `modules/build-types/` | Build-type-specific config: what makes a system minimal/server/docker/gui/pxe-boot/nix-cache |
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| `modules/common/` | Shared NixOS config, Home Manager, aliases imported by every host |
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| `modules/nix-cache/` | Binary cache and remote builder client/server modules |
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| `docs/` | Operational notes for cache, builders, lock updates, and boot services |
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| `scripts/` | Codex setup and validation helpers |
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## Validation
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Safe validation commands for Codex and local review:
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```bash
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bash scripts/codex-setup.sh
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bash scripts/codex-maintenance.sh dry-run
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bash scripts/codex-maintenance.sh
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```
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For individual host evaluation:
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```bash
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nix eval .#nixosConfigurations.<host>.config.system.build.toplevel.drvPath --raw
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```
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Use `nix build --dry-run --no-link` when build planning is needed. Do not run
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deployment, install, disk formatting, mount, or reboot commands from automated
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review sessions.
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## Operations
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- Host rebuilds should consume the committed `flake.lock`.
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- Routine dependency updates should happen through the flake lock automation
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described in `docs/flake-lock-automation.md`.
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- `nix-cache` serves substitutes over HTTP and can act as a remote builder for
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client hosts.
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- `pxe-boot` serves iPXE boot files over HTTP from `/srv/pxe`.
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## Security Notes
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Do not commit tokens, private keys, live credentials, or new password hashes
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as plaintext. Secrets are managed with [sops-nix](https://github.com/Mic92/sops-nix):
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encrypted files live under `secrets/`, recipients (per-host age keys derived
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from each host's existing SSH host key, plus an admin key) are declared in
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`.sops.yaml`. To add or edit a secret:
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```bash
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nix-shell -p sops --run "sops secrets/<file>.yaml"
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```
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then reference it from a module via `config.sops.secrets."<name>".path`
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(or `sops.templates` for values that need to be embedded in a rendered
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config file, e.g. `nix.conf`'s `access-tokens`). Never write a secret value
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directly into a tracked `.nix` file. A pre-commit hook (`.githooks/`,
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enabled via `git config core.hooksPath .githooks`, done automatically by
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`scripts/codex-setup.sh`) runs `gitleaks protect --staged` to catch mistakes
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before they're committed.
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This repository's git *history* still contains secrets committed before this
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migration (see `remove-sensetive-info-refactor.md`) — those are being
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scrubbed and rotated separately; don't treat the repo as safe to make public
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until that's finished.
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