docs: add docker compose quickstart

website/docs/getting-started/docker-quickstart.md

@@ -0,0 +1,134 @@
+# Install with Docker Compose
+
+Run Semantic Router + Envoy locally using Docker Compose v2.
+
+## Prerequisites
+
+- Docker Engine and Docker Compose v2 (use the `docker compose` command, not the legacy `docker-compose`)
+
+   ```bash
+   # Verify
+   docker compose version
+   ```
+
+   Install Docker Compose v2 for Ubuntu(if missing), see more in [Docker Compose Plugin Installation](https://docs.docker.com/compose/install/linux/#install-using-the-repository)
+
+   ```bash
+   # Remove legacy v1 if present (optional)
+   sudo apt-get remove -y docker-compose || true
+
+   sudo apt-get update
+   sudo apt-get install -y ca-certificates curl gnupg
+   sudo install -m 0755 -d /etc/apt/keyrings
+   curl -fsSL https://download.docker.com/linux/ubuntu/gpg | sudo gpg --yes --dearmor -o /etc/apt/keyrings/docker.gpg
+   echo "deb [arch=$(dpkg --print-architecture) signed-by=/etc/apt/keyrings/docker.gpg] https://download.docker.com/linux/ubuntu $(. /etc/os-release && echo $VERSION_CODENAME) stable" | sudo tee /etc/apt/sources.list.d/docker.list > /dev/null
+   sudo apt-get update
+   sudo apt-get install -y docker-ce docker-ce-cli containerd.io docker-buildx-plugin docker-compose-plugin
+
+   docker compose version
+   ```
+
+- Ensure ports 8801, 50051, 19000 are free
+
+## Install and Run with Docker Compose v2
+
+1) Clone the repo and move into it (from your workspace root):
+
+```bash
+git clone https://github.com/vllm-project/semantic-router.git
+cd semantic-router
+```
+
+2) Download required models (classification models):
+
+```bash
+make download-models
+```
+
+This downloads the classification models used by the router:
+
+- Category classifier (ModernBERT-base)
+- PII classifier (ModernBERT-base)
+- Jailbreak classifier (ModernBERT-base)
+
+Note: The BERT similarity model defaults to a remote Hugging Face model. See Troubleshooting for offline/local usage.
+
+3) Start the services with Docker Compose v2:
+
+```bash
+# Start core services (semantic-router + envoy)
+docker compose up --build
+
+# Or run in background (recommended)
+docker compose up --build -d
+
+# With testing profile (includes mock vLLM)
+docker compose --profile testing up --build
+```
+
+4) Verify
+
+- Semantic Router (gRPC): localhost:50051
+- Envoy Proxy: http://localhost:8801
+- Envoy Admin: http://localhost:19000
+
+## Common Operations
+
+```bash
+# View service status
+docker compose ps
+
+# Follow logs for the router service
+docker compose logs -f semantic-router
+
+# Exec into the router container
+docker compose exec semantic-router bash
+
+# Stop and clean up containers
+docker compose down
+```
+
+## Troubleshooting
+
+### 1) Router exits immediately with a Hugging Face DNS/download error
+
+Symptoms (from `docker compose logs -f semantic-router`):
+
+```
+Failed to initialize BERT: request error: https://huggingface.co/... Dns Failed: resolve dns name 'huggingface.co:443'
+```
+
+Why: `bert_model.model_id` in `config/config.yaml` points to a remote model (`sentence-transformers/all-MiniLM-L12-v2`). If the container cannot resolve or reach the internet, startup fails.
+
+Fix options:
+
+- Allow network access in the container (online):
+  - Ensure your host can resolve DNS, or add DNS servers to the `semantic-router` service in `docker-compose.yml`:
+
+      ```yaml
+      services:
+         semantic-router:
+            # ...
+            dns:
+               - 1.1.1.1
+               - 8.8.8.8
+      ```
+
+  - If behind a proxy, set `http_proxy/https_proxy/no_proxy` env vars for the service.
+
+- Use a local copy of the model (offline):
+   1. Download `sentence-transformers/all-MiniLM-L12-v2` to `./models/sentence-transformers/all-MiniLM-L12-v2/` on the host.
+   2. Update `config/config.yaml` to use the local path (mounted into the container at `/app/models`):
+
+       ```yaml
+       bert_model:
+          model_id: "models/sentence-transformers/all-MiniLM-L12-v2"
+          threshold: 0.6
+          use_cpu: true
+       ```
+
+   3. Recreate services: `docker compose up -d --build`
+
+### 2) Port already in use
+
+Make sure 8801, 50051, 19000 are not bound by other processes. Adjust ports in `docker-compose.yml` if needed.

website/sidebars.js

@@ -38,6 +38,7 @@ const sidebars = {
       label: 'Getting Started',
       items: [
         'getting-started/installation',
+        'getting-started/docker-quickstart',
         'getting-started/reasoning',
         'getting-started/configuration',
       ],