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vLLM

This example shows how to deploy Qwen/Qwen3.6-27B using vLLM and dstack.

Apply a configuration

Here's an example of a service that deploys Qwen/Qwen3.6-27B using vLLM.

type: service
name: qwen36

image: vllm/vllm-openai:v0.19.1

commands:
  - |
    vllm serve Qwen/Qwen3.6-27B \
      --host 0.0.0.0 \
      --port 8000 \
      --tensor-parallel-size $DSTACK_GPUS_NUM \
      --max-model-len 262144 \
      --reasoning-parser qwen3

port: 8000
model: Qwen/Qwen3.6-27B

volumes:
  - instance_path: /root/.cache
    path: /root/.cache
    optional: true

resources:
  shm_size: 16GB
  gpu: H100:4

type: service
name: qwen36

image: vllm/vllm-openai-rocm:v0.19.1

commands:
  - |
    vllm serve Qwen/Qwen3.6-27B \
      --host 0.0.0.0 \
      --port 8000 \
      --tensor-parallel-size $DSTACK_GPUS_NUM \
      --max-model-len 262144 \
      --reasoning-parser qwen3

port: 8000
model: Qwen/Qwen3.6-27B

volumes:
  - instance_path: /root/.cache
    path: /root/.cache
    optional: true

resources:
  cpu: 52..
  memory: 896GB..
  shm_size: 16GB
  disk: 450GB..
  gpu: MI300X:4

Qwen3.6-27B is a multimodal model. For text-only workloads, add --language-model-only to free more memory for the KV cache. To enable tool calling, add --enable-auto-tool-choice --tool-call-parser qwen3_coder.

Save one of the configurations above as qwen36.dstack.yml, then use the dstack apply command.

$ dstack apply -f qwen36.dstack.yml

If no gateway is created, the service endpoint will be available at <dstack server URL>/proxy/services/<project name>/<run name>/.

curl http://127.0.0.1:3000/proxy/services/main/qwen36/v1/chat/completions \
    -X POST \
    -H 'Authorization: Bearer &lt;dstack token&gt;' \
    -H 'Content-Type: application/json' \
    -d '{
      "model": "Qwen/Qwen3.6-27B",
      "messages": [
        {
          "role": "user",
          "content": "A bat and a ball cost $1.10 total. The bat costs $1.00 more than the ball. How much does the ball cost?"
        }
      ],
      "max_tokens": 1024
    }'

If a gateway is configured (e.g. to enable auto-scaling, HTTPS, rate limits, etc.), the service endpoint will be available at https://qwen36.<gateway domain>/.

What's next?

  1. Read about services and gateways
  2. Browse the Qwen 3.5 & 3.6 vLLM recipe and the SGLang example