Grant
78 lines
3.5 KiB
Markdown
78 lines
3.5 KiB
Markdown
# spark-control
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A browser-based control panel for a dual-DGX-Spark vLLM cluster. Designed to run as a [StartOS 0.4](https://docs.start9.com/packaging/0.4.0.x/) package on a Start9 server on the same LAN as the Sparks.
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## What it does
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- Shows which LLM is currently loaded on the cluster (`:8888/v1/models`).
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- Click to swap to a different model — stops the current one, launches the new one, streams logs to the UI until `Application startup complete.` appears.
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- Surfaces health for Parakeet (STT, `:8000`) and Magpie (TTS, `:9000`) on Spark 2.
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## Architecture
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```
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[Browser/phone] ──► [StartOS reverse proxy] ──► [spark-control container]
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│ (SSH over LAN)
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▼
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[Spark 1] ──► launch-cluster.sh
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│
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▼
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[Spark 2]
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```
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Two layers in this repo:
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- `image/` — a self-contained FastAPI app + static UI. Runs anywhere with `uvicorn` and an SSH client. Useful for development.
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- `package/` — a thin StartOS 0.4 wrapper that packages the image, exposes the UI on the LAN, and gives the user actions to configure SSH access to the Sparks.
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## Quick start (local dev, no StartOS yet)
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```bash
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cd image
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python3 -m venv .venv && source .venv/bin/activate
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pip install -e .
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export SPARK1_HOST=<spark-1-ip>
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export SPARK1_USER=<spark-user>
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export SPARK2_HOST=<spark-2-ip>
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export SPARK2_USER=<spark-user>
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export SSH_KEY_PATH="$HOME/Library/Application Support/NVIDIA/Sync/config/nvsync.key"
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uvicorn app.server:app --host 0.0.0.0 --port 9999 --reload
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```
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Open <http://localhost:9999>.
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> **Note:** use the **IP** `<spark-1-ip>` for Spark 1, not `<spark-1-host>.local`. mDNS resolves to IPv6 first and `httpx` hangs on it because vLLM only binds IPv4.
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## Build the StartOS package
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```bash
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cd package
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npm i # one-time
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make x86 # produces spark-control_x86_64.s9pk (~55 MB)
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```
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Requires [`start-cli`](https://docs.start9.com/latest/developer-guide/sdk/installing-the-sdk), Node ≥ 22, Docker. The build runs `tsc` + `ncc` for the TS bundle, then `docker build` on `image/Dockerfile`, then `start-cli s9pk pack` to produce the `.s9pk`.
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To sideload onto your Start9: `make install` (needs `host:` set in `~/.startos/config.yaml`), or upload the `.s9pk` via the Start9 web UI's sideload feature.
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## Post-install setup (one-time per Start9 install)
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1. Open the Spark Control service → **Actions** → **Show Public Key** → copy the line.
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2. SSH to each Spark and append the line to `~/.ssh/authorized_keys` for the `<spark-user>` user.
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3. **Actions** → **Configure Sparks** → enter `<spark-1-ip>` / `<spark-user>` for Spark 1 and `<spark-2-ip>` / `<spark-user>` for Spark 2.
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4. Start the service. Open the Web UI — current model + health should show within ~5 s.
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## Repo layout
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- `image/` — Docker image source (FastAPI app + `models.yaml`)
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- `package/` — StartOS 0.4 package source
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- `runbook.md` — operating notes
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- `known-issues.md` — known quirks and workarounds
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- `LICENSE` — MIT
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## Status
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**v0.1** — local-only, single-cluster, no auth (trusts LAN). Five LLMs in the catalog: qwen3-vl (cluster), gemma4, qwen36, plus two legacy entries. Magpie surfaces red until its container is fixed.
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v0.2 backlog (in `runbook.md` / commits): Parakeet/Magpie lifecycle controls, configurable flag tiers in UI, Open WebUI integration, magpie-tts fix.
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