# LiteLLM Gateway — Cloudron App

A Cloudron app package for [LiteLLM](https://litellm.ai/), the open-source AI gateway, configured for the **Inference Cooperative**.

LiteLLM is the single gateway between members and the inference backends. It handles per-member API keys, usage metering, rate limiting (via budget caps), and model routing — all behind one OpenAI-compatible endpoint.

## What this provides

- **LiteLLM proxy** with an OpenAI-compatible API on port 4000
- **Per-member virtual API keys** with budget caps and rate limits
- **Usage / spend tracking** per key, per model
- **Model routing** to Tinfoil (TEE-protected inference)
- **Cloudron PostgreSQL** for keys, teams, and spend logs
- **Cloudron Redis** for rate limiting and caching
- **Automatic SSL, backups, and sandboxing** (Cloudron-managed)
- **Master key + salt key** auto-generated on first start, persisted in `/app/data`

## Architecture

```
Members → Open WebUI / LobeChat → LiteLLM (this app) → Tinfoil (TEE)
```

LiteLLM is the control plane (keys, metering, routing). It does **not** run models itself — it forwards to Tinfoil, which runs open models inside trusted execution environments (TEEs).

## Files

- `CloudronManifest.json` — Cloudron app manifest (addons, ports, metadata)
- `Dockerfile` — wraps LiteLLM's official image for Cloudron's environment
- `start.sh` — startup script that wires up Cloudron's Postgres/Redis and writes the default config
- `config.yaml` — default LiteLLM config (Tinfoil-only, two models)
- `logo.png` — app icon

## Models (MVP)

Two models, both TEE-protected via Tinfoil:

| Model | Role | Price (in/out per M tokens) |
|-------|------|------------------------------|
| `deepseek-v4-flash` | Default — best agent performance, 1M context | $0.30 / $0.70 |
| `gpt-oss-120b` | Fallback — cheapest, built for agentic workflows | $0.15 / $0.60 |

If DeepSeek is down, LiteLLM automatically falls back to GPT-OSS.

---

## Building and installing

This package uses Cloudron's **on-server build** (no local Docker, no registry). The Cloudron CLI uploads the source and Cloudron builds the image on the server.

### Prerequisites

- The [Cloudron CLI](https://docs.cloudron.io/packaging/cli/) installed on a machine with access to the Cloudron server
- A Cloudron instance with the `inference.coop` domain

### Install

```bash
# 1. Install the Cloudron CLI (once)
npm install -g cloudron-cli

# 2. Log in to the Cloudron
cloudron login my.inference.coop

# 3. From this directory, install (builds on the server)
cloudron install --location gateway
```

`--location gateway` installs the app at `gateway.inference.coop`. Omit `--location` to be prompted.

### Configure

After install, set the Tinfoil API key in Cloudron → app → Settings → Environment Variables:

- `TINFOIL_API_KEY` — your Tinfoil API key (from https://tinfoil.sh/)

The following are auto-generated and should **not** be set manually:

- `LITELLM_MASTER_KEY` — generated on first start, stored in `/app/data/.master_key`
- `LITELLM_SALT_KEY` — generated on first start, stored in `/app/data/.salt_key`
- `DATABASE_URL` — from Cloudron's PostgreSQL addon
- `REDIS_HOST`, `REDIS_PORT`, `REDIS_PASSWORD` — from Cloudron's Redis addon

### Access the admin UI

1. Open `https://gateway.inference.coop/ui`
2. Log in with username `admin` and the master key as password
3. Find the master key: `cloudron exec --app <app-id> cat /app/data/.master_key`

---

## Updating LiteLLM

This is the routine maintenance path. LiteLLM releases frequently. Upgrading is
a code change (pin a new version) plus a DB migration that runs on first boot —
expect a 15–20 min maintenance window and **never panic-restart mid-migration**
(each restart resets the clock).

### Rules (learned from the 2026-10-02 outage)

- **Pin the exact version tag, never a floating tag.** Registries silently move
  floating tags (`main-v1.74.0-stable`, `latest`) to newer digests, so a routine
  rebuild changes the deployed version with no pin change and triggers a full
  schema migration against an unprepared DB. Always
  `FROM ghcr.io/berriai/litellm:vX.Y.Z`.
- **Give the app a real memory limit.** Cloudron's default when `memoryLimit: 0`
  is a 256 MB cgroup cap; the proxy fits in 256 MB but Prisma's schema engine
  does NOT, and gets SIGKILL'd (OOM, exit 137) mid-migration. This package sets
  `memoryLimit: 2147483648` (2 GB) in `CloudronManifest.json` — don't lower it.
- **`LITELLM_MIGRATION_DIR=/app/data/migrations` is exported in `start.sh`.** The
  database was created by `prisma db push`, so it has no `_prisma_migrations`
  ledger; without a writable migration dir the boot migration hits P3005
  ("schema is not empty") and crash-loops. Keep it pointed at the persistent
  volume.
- **Verify with a member-scope key, not only the master key.** Master-key
  requests bypass the member auth path, so they can pass even on a half-migrated
  schema while every member key 401s. See the checklist below.

### Steps

1. **Pick a target version** from the [LiteLLM changelog](https://github.com/BerriAI/litellm/releases). Stay at or above v1.84.0 (the fix line for CVE-2026-35029 and CVE-2026-59822, the latter on CISA's KEV list).

2. **Bump the pin** in `Dockerfile`:

   ```dockerfile
   FROM ghcr.io/berriai/litellm:v1.84.0
   #                              ^^^^^^ exact tag, never main-*-stable
   ```

3. **Bump the manifest** in `CloudronManifest.json`:

   ```json
   "upstreamVersion": "1.84.0"
   ```

4. **Redeploy:**

   ```bash
   cloudron update --app <app-id>
   ```

   First boot after the version change runs `prisma migrate deploy` (or
   baselines + `db push` if the ledger is missing) before binding port 4000.
   Expect 15–20 min of ECONNREFUSED healthcheck errors — this is normal.

### Verify after upgrading

1. `GET https://gateway.inference.coop/health/liveliness` → 200
2. Generate a temp key with the master key → if `/key/generate` 500s, the schema is incomplete; fix the migration before anything else
3. Use the **temp key** (not master) for `GET /v1/models` → full catalog
4. Use the **temp key** for a small `POST /v1/chat/completions` → content + usage
5. OPTIONS preflight from a foreign origin → 400; from `chat.inference.coop` → allowed
6. Cloudron app health = healthy, then delete the temp key

### Before updating

- Check the [LiteLLM changelog](https://github.com/BerriAI/litellm/releases) for breaking changes
- The `start.sh` and `config.yaml` may need adjustment if LiteLLM changes its env-var or config schema
- The CORS env var is `LITELLM_CORS_ORIGINS` (upstream-native since 1.84.0); the old `LITELLM_CORS_ALLOWED_ORIGINS` + sed patch are dead — don't re-add them
- Test on a staging instance if the version jump is large

---

## Environment variables

| Variable | Required | Purpose |
|----------|----------|---------|
| `TINFOIL_API_KEY` | Yes | Tinfoil API key for TEE inference |

## Connecting Open WebUI

In Open WebUI settings:

- **API Base URL:** `https://gateway.inference.coop/v1`
- **API Key:** a virtual key created in LiteLLM's Admin UI

## OIDC / SSO (future)

The current package uses LiteLLM's built-in admin/master-key auth, which is sufficient for the MVP. Full OIDC SSO (admin UI behind Cloudron login) is a TODO — add the `"oidc": {}` addon to the manifest and configure LiteLLM's SSO hooks per https://docs.litellm.ai/docs/proxy/custom_sso.

## Related repos

- `co-op/org-dev` — the full inference.coop design doc and deploy scripts
- `co-op/website` — the public landing page
- `co-op/design-assets` — logos, fonts, brand materials