Lars Nolden
80 lines
3.1 KiB
Markdown
80 lines
3.1 KiB
Markdown
# Gebos
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IoT telemetry stack on bare-metal NixOS.
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This repo is a monorepo containing all code, NixOS modules, host configurations,
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and CI/CD pipelines for the project. Everything is one `flake.nix`.
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## Architecture
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Three hosts (see issue #21 for the full design discussion):
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| Host | Role | Public hostname | Private IP |
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| ------------- | ----------------------------------------- | ---------------------- | ---------- |
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| `mqtt-ingest` | HiveMQ CE + Go MQTT→Postgres ingester | `ingest.gebos.online` | `10.0.0.4` |
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| `db-host` | Postgres 17 + TimescaleDB (telemetry+auth)| `db.gebos.online` (SSH only) | `10.0.0.2` |
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| `app-host` | Caddy + Kong + Supabase (compose) + SPA | `app.gebos.online`, `api.gebos.online` | `10.0.0.3` |
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Public REST surface is PostgREST + SQL `/rpc/` functions, fronted by Kong, TLS-terminated by Caddy.
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Supabase Studio is bound to `127.0.0.1` on `app-host` — reach it with `ssh -L 3000:127.0.0.1:3000 app-host`.
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### Networking
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There is no private DNS. Each host has a public hostname (used for `deploy-rs`
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SSH access from the Gitea runner, which is **not** on the private network, plus
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TLS ingress where applicable), and a static `10.0.0.0/8` IP used for all
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host-to-host traffic:
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- `db.gebos.online` is for SSH/deploy only — Postgres is never exposed publicly.
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- `app-host` and `mqtt-ingest` reach Postgres at `10.0.0.2:5432` over the private
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network.
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- `db-host` only accepts Postgres (port 5432) from `10.0.0.0/8` (firewall rule
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in `nix/hosts/db-host.nix`).
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## Repo layout
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```
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flake.nix
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frontend/ # Vite + React SPA
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ingester/ # Go MQTT → Postgres
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nix/
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modules/ # NixOS modules (one per service)
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hosts/ # nixosConfigurations: mqtt-ingest, db-host, app-host
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supabase/ # vendored Supabase docker-compose, db init SQL
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dev/ # process-compose for local development
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deploy.nix # deploy-rs node map
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.gitea/workflows/ # CI + CD
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```
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## Local development
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```
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nix run .#dev
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```
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Brings the full stack up on one machine via process-compose-flake (Postgres,
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Supabase compose, Kong, Caddy, ingester, Vite dev server). NixOS required.
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## Deployment
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`deploy-rs` from a Gitea Actions runner on push to `main`. Closures are built
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once, copied to each host, activated with auto-rollback. Order: `db-host` →
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`app-host` → `mqtt-ingest`.
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```
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nix run github:serokell/deploy-rs -- .#db-host # one host
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nix run github:serokell/deploy-rs -- . # all hosts
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```
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## Secrets
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[sops-nix](https://github.com/Mic92/sops-nix) + [age](https://github.com/FiloSottile/age).
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Single encrypted file at `nix/secrets/secrets.yaml`; each host decrypts only the
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keys it needs at activation, rendered into a tmpfs env file consumed by systemd
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`EnvironmentFile=`. Plaintext never enters the Nix store. See
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[`nix/secrets/README.md`](nix/secrets/README.md) for bootstrap and rotation.
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Local dev needs **no** secrets bootstrap — `nix run .#dev`, `go run ./ingester`,
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and `npm --prefix frontend run dev` all default to the local dev stack values
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defined in `nix/dev/process-compose.nix`.
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