# OpenWebUI

OpenWebUI is a self-hosted chat interface for LLMs. It connects to OpenAI-compatible endpoints (vLLM, llama.cpp, Ollama) and adds RAG, plugins, tool calling, and multi-user support.

**Host:** Dankclaw — **Port:** 3005 (host) → 8080 (container) — **Boot-persistent:** Quadlet — **Docs:** https://github.com/open-webui/open-webui

## Facts

| Item | Value |
|------|-------|
| Image | `ghcr.io/open-webui/open-webui:main` (CPU build; Dankclaw is CPU-only) |
| Port | 3005 (host) → 8080 (container). Port 3000 is Gitea's HTTP, so it is not usable. |
| Data volume | `/home/dank/Containers/open-webui/data` → `/app/backend/data` |
| Default backend | vLLM on Dankclaw `:52625` = `frank-default-large` (via `host.containers.internal:52625`) |
| Network | `slirp4netns` (isolated) |
| Persistence | Quadlet unit `open-webui.service`; `[Install] WantedBy=default.target` |
| Deploy | `scripts/deploy-open-webui-quadlet.sh dankclaw` |

## The LLM backends

The fleet runs two OpenAI-compatible endpoints. This mapping is the **live** state (verified 2026-08-19); it is the reverse of the 2026-08-17 note, which is now out of date.

| Endpoint | Model name | Host | Capability |
|----------|-----------|------|-----------|
| `:52625` (vLLM) | `frank-default-large` | Dankclaw | completion |
| `:7770` (llama.cpp FastMTP) | `frank-default-small` | Dankserver | completion, multimodal |

The default connection points at the local vLLM (`frank-default-large`), so chat stays on-host. To add the other backend, open **Admin → Connections** in the UI and point an OpenAI connection at `http://192.168.0.235:7770/v1` (key `none`).

> Both endpoints are bare-metal systemd services managed by the sibling `vllmScripts` repository (not this repo). Model swaps, context sizing, and spec tuning happen there. See the [vllmScripts knowledge base](../../vllmScripts/docs/index.md).

## Boot persistence (Quadlet)

The unit lives at `dankclaw/open-webui/quadlet/open-webui.container`. On the host it installs to `~/.config/containers/systemd/open-webui.container`. The generator turns it into `open-webui.service`. Because the unit sets `[Install] WantedBy=default.target` and user linger is on, it starts at boot. `systemctl --user is-enabled open-webui.service` reports `generated` (the quadlet boot-start state).

## Volumes

| Container path | Host path |
|----------------|-----------|
| `/app/backend/data` | `/home/dank/Containers/open-webui/data` |

The data dir holds the database, RAG indexes, and uploads. The deploy script creates it if missing and preserves it across reruns.

## Healthcheck

OpenWebUI responds on `/health` with 200. Probe it at `http://dankclaw:3005/health`.

## Retired instances

- The compose `open-webui` service (port 3000) was never run: 3000 is Gitea's HTTP port, so it could not bind.
- The bare-container `open-webui` on Dankserver (port 3000) pointed at a dead backend (`:9090`) and was removed. Its data dir is preserved on Dankserver in case it is needed.
- The bare-container `searxng` on Dankserver (port 8081) was removed. SearXNG now runs only on Dankclaw behind Caddy.

## Gotchas

- Use the non-CUDA image on this CPU-only host.
- The default admin account is created on first login; secure it immediately.
- If the backend is loading (3–8 minute model load), OpenWebUI shows connection errors until the model is ready.
- `host.containers.internal` reaches only the podman host. To reach the Dankserver backend, use the LAN address `192.168.0.235:7770`.

## See Also

- [[Dankclaw Stack]]
- [[Hermes]] — the agent OpenWebUI can talk to
- [[SearXNG]] — the search engine on this host
- [vllmScripts knowledge base](../../vllmScripts/docs/index.md) — the vLLM and llama.cpp endpoints