Jetson LLM Serve Agent Skill

Jetson LLM Serve

Encodes the Jetson AI Lab GenAI tutorial: on Orin JetPack 7.2 / L4T r39+, use upstream vLLM 0.20+ (vllm/vllm-openai:latest); on older Orin, pick the NVIDIA-AI-IOT prebuilt vLLM container; on Thor, use upstream vLLM 0.20+ or validated native vLLM 0.20+, and use NVIDIA SGLang 26.01 (nvcr.io/nvidia/sglang:26.01-py3, SGLang 0.5.5.post2) when SGLang is requested. Set MAXN, make Hugging Face credentials/cache available, and launch an OpenAI-compatible server. Works for both LLMs and VLMs.

Purpose

Provide a Jetson-appropriate serving recipe for an LLM or VLM using vLLM or SGLang, including runtime path, launch command, endpoint, and verification step.

When to use

• "Run / serve / host this model on a Jetson."
• "Start a vLLM server I can hit from Open WebUI / my app."
• After jetson-inference-mem-tune produced launch flags and the user wants to actually start the server.

For recipe-only questions, answer from this document without starting

containers. Run live pre-flight checks only when the user asks you to check this

device or execute the deployment.

Prerequisites

• Run on the Jetson host or a shell with Docker access to the Jetson GPU runtime.
• Know the target Jetson generation (thor or orin) and the model identifier or local checkpoint path.
• Use HF_TOKEN only when the model is gated/private; public models should omit the token environment variable.
• Use jetson-inference-mem-tune first when memory headroom or launch flags are uncertain.

Instructions

For recipe questions, provide a complete launch recipe instead of trying to call

jetson-llm-serve as a tool. A complete answer includes:

• The Jetson-appropriate runtime path: upstream vLLM 0.20+ (vllm/vllm-openai:latest) or NVIDIA SGLang 26.01 (nvcr.io/nvidia/sglang:26.01-py3, SGLang 0.5.5.post2) on Thor, NVIDIA-AI-IOT vLLM container on older Orin, or upstream vLLM 0.20+ on Orin JetPack 7.2 / L4T r39+.
• The model checkpoint / Hugging Face repo the user named.
• A docker run + server command sketch with --host 0.0.0.0 --port 8000.
• The OpenAI-compatible endpoint: http://<jetson-ip>:8000/v1.
• A verification step such as curl http://localhost:8000/v1/models.

For VLM questions, explicitly say the VLM uses the same vLLM serving flow as an

LLM with a different vision-language checkpoint. Do not omit vLLM or the

Jetson container when answering VLM prompts.

Step 1 — Pick the runtime path (per Jetson family)

Use upstream vLLM 0.20+ on Thor (vllm/vllm-openai:latest, or a validated native vLLM 0.20+ install). On Orin JetPack 7.2 / L4T r39+, use upstream vLLM 0.20+ (vllm/vllm-openai:latest). On older Orin releases, use the NVIDIA-AI-IOT prebuilt vLLM image (packages) because it ships the correct CUDA / cuDNN / TensorRT stack for that JetPack. Use NVIDIA SGLang 26.01 (nvcr.io/nvidia/sglang:26.01-py3, SGLang 0.5.5.post2) on Thor when the user asks for SGLang, RAG, tool-use, or programmable serving; do not recommend native upstream SGLang on Orin unless a JetPack-matched release explicitly supports it.

| Jetson family | Runtime path |

|-----------------------------|---------------------------------------------------|

| Thor (T5000, T4000) | upstream vLLM 0.20+ (vllm/vllm-openai:latest) or NVIDIA SGLang 26.01 (nvcr.io/nvidia/sglang:26.01-py3, SGLang 0.5.5.post2) |

| AGX Orin / Orin NX / Nano | Orin JetPack 7.2 / L4T r39+: upstream vLLM 0.20+ (vllm/vllm-openai:latest); older Orin: ghcr.io/nvidia-ai-iot/vllm:latest-jetson-orin |

To detect the silicon era for image tags:

• Source the detector so exports survive in your shell:

   . skills/jetson-diagnostic/scripts/detect_jetson.sh

• Check JETSON_GENERATION (thor or orin) and choose the matching runtime path from the table above.
• Use JETSON_PRODUCT_LINE for a finer bucket such as thor-agx or orin-nano; JETSON_SKU remains the legacy identifier.

Do not use bash skills/jetson-diagnostic/scripts/detect_jetson.sh when you need exported variables in the caller; running with bash uses a subshell.

Step 2 — Set MAXN power mode

sudo nvpmodel -m 0 && sudo jetson_clocks

Skip this only if the user explicitly asks for a power-constrained run; otherwise benchmark and serving numbers will be inconsistent.

Step 3 — Run the server

On Thor with vLLM, use upstream vLLM 0.20+ (vllm/vllm-openai:latest) or a validated native vLLM 0.20+ install:

docker run --rm -it --runtime nvidia --network host --ipc host --name vllm \
  -v "$HOME/.cache/huggingface:/root/.cache/huggingface" \
  -e HF_TOKEN="$HF_TOKEN" \
  vllm/vllm-openai:latest \
  vllm serve <hf-repo-id> \
    --host 0.0.0.0 --port 8000 \
    --max-model-len 8192 \
    --gpu-memory-utilization 0.75 \
    --tensor-parallel-size 1

On Orin JetPack 7.2 / L4T r39+, use upstream vLLM 0.20+ (vllm/vllm-openai:latest). On older Orin releases, use the NVIDIA-AI-IOT container:

docker run --rm -it --runtime nvidia --network host --name vllm \
  -v "$HOME/.cache/huggingface:/root/.cache/huggingface" \
  -e HF_TOKEN="$HF_TOKEN" \
  ghcr.io/nvidia-ai-iot/vllm:latest-jetson-orin \
  vllm serve <hf-repo-id> \
    --host 0.0.0.0 --port 8000 \
    --max-model-len 4096 \
    --gpu-memory-utilization 0.85 \
    --tensor-parallel-size 1

HF_TOKEN is required only for gated/private Hugging Face models; omit the -e HF_TOKEN="$HF_TOKEN" line for public models that do not need Hub authentication. Passing HF_TOKEN as an environment variable can expose it through Docker inspect output, process metadata, or logs on shared systems. Prefer the narrowest-scoped token possible, rotate/revoke it after shared-container use, and use a mounted credential file or Docker secret when the deployment environment supports that pattern.

Wait for Application startup complete. Server is on http://0.0.0.0:8000/v1.

For SGLang on Thor, use NVIDIA SGLang 26.01 (nvcr.io/nvidia/sglang:26.01-py3), which packages SGLang 0.5.5.post2 and lists Jetson Thor support. Do not judge Thor SGLang support from older prerelease SGLang results:

docker run --rm -it --runtime nvidia --network host --ipc host --name sglang \
  -v "$HOME/.cache/huggingface:/root/.cache/huggingface" \
  -e HF_TOKEN="$HF_TOKEN" \
  nvcr.io/nvidia/sglang:26.01-py3 \
  python3 -m sglang.launch_server \
    --model-path <hf-repo-id> \
    --host 0.0.0.0 \
    --port 8000 \
    --mem-fraction-static 0.60 \
    --max-running-requests 8

Use SGLang when the user needs RAG/tool-use workflows, structured generation, or

SGLang-specific scheduling. For plain high-throughput OpenAI-compatible serving,

prefer vLLM unless the user asks for SGLang.

SKU-appropriate defaults

| Knob | Orin Nano / NX | AGX Orin / Thor |

|----------------------------|----------------|-----------------|

| --max-model-len | 4096 | 8192 |

| --gpu-memory-utilization | 0.85 | 0.85 |

| --tensor-parallel-size | 1 | 1 |

If the server OOMs at startup, lower --gpu-memory-utilization by 0.05 and re-launch (or run jetson-inference-mem-tune for a workload-aware recommendation).

Quantization preferences (matters more than the runtime)

For vLLM and SGLang, choose checkpoint formats by Jetson family:

| Jetson family | First choice | Acceptable fallback |

|---------------|--------------|---------------------|

| Thor | NVFP4 when the model/runtime supports it | W4A16 |

| Orin Nano / NX | W4A16 | AWQ or GPTQ 4-bit |

| AGX Orin | W4A16 | AWQ or GPTQ 4-bit |

For llama.cpp and Ollama, use GGUF model quantization names instead: recommend INT4 / Q4_K_M GGUF on both Orin and Thor, and choose a smaller INT4 GGUF model if memory is tight. Do not call GGUF Q4_K_M a W4A16/AWQ/GPTQ model. NVFP4 is Thor-preferred and Thor-tuned for runtimes that support it.

VLM mode

VLMs use the same flow as LLMs: same container, same vllm serve invocation, different vision-language checkpoint. The container handles image preprocessing. For a VLM-specific browser UI, use the live-vlm-webui container; for a generic chat UI for either, use Open WebUI pointed at http://<jetson-ip>:8000/v1.

Do not fabricate device capacity

Do not invent RAM totals, free-memory values, model sizes, JetPack versions, or

SKU/variant names when giving a serving recipe. If capacity matters, either run

the live pre-flight checks (when execution is allowed) or hand off to

jetson-inference-mem-tune / jetson-memory-audit. If live data is not

available, say the value is unknown and provide conservative defaults instead

of quoting a made-up number.

Pre-flight checklist (the agent should verify before running Step 3)

• [ ] On a Jetson (/proc/device-tree/model contains NVIDIA Jetson).
• [ ] nvpmodel -q reports a recognized max-performance mode: MAXN or MAXN_* such as MAXN_SUPER. Wattage-named modes should be reported as warnings unless the user explicitly confirms they are the intended benchmark mode for that device.
• [ ] On Thor, check whether MIG is enabled before launching (nvidia-smi -L and nvidia-smi mig -lgi). If MIG is enabled, warn that vLLM/SGLang may see only a MIG slice or no CUDA device.
• [ ] On Thor with MIG or display/camera contention, inspect GPU users with sudo lsof /dev/nvidia*. Display managers, Xorg/GNOME, or nvargus-daemon may hold GPU device files; do not stop services or change MIG mode unless the user explicitly approves.
• [ ] No container named vllm already running (docker ps --format '{{.Names}}'); otherwise docker rm -f vllm first.
• [ ] Docker exposes the NVIDIA runtime (docker info | grep -i 'runtimes.*nvidia'), or a GPU-enabled container can run nvidia-smi.
• [ ] ~/.cache/huggingface exists; HF_TOKEN is set if the model is gated.

Limitations

• This skill provides serving commands and pre-flight checks; it does not benchmark the deployed server.
• Container tags such as latest are mutable. For release or compliance deployments, pin a digest and record it with the deployment notes.
• vLLM and SGLang memory limits still depend on model architecture, quantization, context length, and concurrent request count. Use jetson-inference-mem-tune when a command OOMs or memory headroom matters.
• Thor vLLM requires upstream vLLM 0.20+ or newer. Older upstream vLLM images may not support Thor / SM 11.0 correctly.
• Thor SGLang should use NVIDIA SGLang 26.01 or newer release notes that explicitly list Jetson Thor support. NVIDIA SGLang 26.01 contains SGLang 0.5.5.post2.
• On Thor, MIG, desktop display, or camera services can hide the full GPU from containers. This skill should detect and warn only; disabling MIG or stopping services such as gdm3 or nvargus-daemon requires explicit user approval.
• Host-native vLLM/SGLang on Thor should be used only when that install is already validated on the target JetPack.

Hand off to

• jetson-llm-benchmark to actually measure the deployed server.
• jetson-speculative-decoding to add EAGLE-3 / draft-model speculation by appending --speculative-config '{...}' to the vllm serve command above.
• jetson-inference-mem-tune if the server OOMs or is memory-bound.

Source

Jetson AI Lab — Introduction to GenAI on Jetson: How to Run LLMs and VLMs and NVIDIA-AI-IOT GHCR packages.