vllm-setup

por nvidia

Implementar un servidor de inferencia vLLM en una estación NVIDIA DGX GB300 con contenedor validado, direccionamiento de GPU y parámetros de ajuste. Usar cuando el usuario solicite servir un…

npx skills add https://github.com/nvidia/dgx-spark-playbooks --skill vllm-setup

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vLLM Setup on DGX Station

Deploy a vLLM inference server on DGX Station with validated configuration.

Steps

Find the GB300 GPU index. Run:
```
nvidia-smi --query-gpu=index,name --format=csv,noheader
```
Identify the device index for the GB300 (typically device 1). Use this index for --gpus below. Do NOT use --gpus all — mixed coherency will cause CUDA failures.
Ask the user which model to serve. If they don't have a preference, suggest:
- nvidia/Qwen3-235B-A22B-NVFP4 — large MoE model, fits in 279 GB HBM
- meta-llama/Llama-3.1-70B-Instruct — solid general-purpose model
- Qwen/Qwen3-8B — small model for testing
Check if the user has an HF_TOKEN. Many models require HuggingFace authentication. The token must be passed inline with -e HF_TOKEN="..." — do not rely on shell export in background Docker tasks.

Deploy the container. Use this validated configuration:

docker pull nvcr.io/nvidia/vllm:26.01-py3

docker run -d \
  --name vllm-server \
  --gpus '"device=<GB300_INDEX>"' \
  --ipc host \
  --ulimit memlock=-1 \
  --ulimit stack=67108864 \
  -p 8000:8000 \
  -e HF_TOKEN="<TOKEN>" \
  -v "$HOME/.cache/huggingface/hub:/root/.cache/huggingface/hub" \
  nvcr.io/nvidia/vllm:26.01-py3 \
  vllm serve "<MODEL>" \
    --max-model-len 32768 \
    --gpu-memory-utilization 0.9

Container version: Use nvcr.io/nvidia/vllm:26.01-py3. Do NOT use 25.10 — it has a FlashInfer buffer overflow on DGX Station.

Wait for the server to be ready. Monitor logs:
```
docker logs -f vllm-server
```
Wait for the line indicating the server is listening on port 8000.

Test the server:

curl http://localhost:8000/v1/chat/completions \
  -H "Content-Type: application/json" \
  -d '{
    "model": "<MODEL>",
    "messages": [{"role": "user", "content": "Hello"}],
    "max_tokens": 64
  }'

Report the result to the user, including:
- Model loaded and serving on port 8000
- GPU memory utilization
- How to stop: docker stop vllm-server && docker rm vllm-server

Tuning parameters

Adjust these based on the user's workload:

Parameter	Default	Agent workloads	Throughput workloads
`--max-model-len`	32768	32768-65536	8192-16384
`--gpu-memory-utilization`	0.9	0.85-0.90	0.90-0.92
`--enable-prefix-caching`	off	Enable (multi-turn reuse)	Enable
`--max-num-seqs`	default	4-16 (lower latency)	32+ (higher throughput)