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To deploy an LLM inference server on Kubernetes, run an inference server such as vLLM as a workload, make the model files available to it, allocate suitable CPU or GPU resources, and expose the workload through a Kubernetes Service. Configure startup and readiness probes for model initialization, then verify that the pod is ready and the API responds. For a direct setup, use native Kubernetes Deployment and Service resources; choose KServe’s LLMInferenceService when you want a declarative serving resource with integrated routing or scheduling features.
Choose a deployment path
| Option | How you configure it | Useful when | Documented capabilities |
|---|---|---|---|
| Native vLLM on Kubernetes | Kubernetes Deployment and Service | You want direct control over a compact serving setup. | The vLLM guide covers CPU and GPU deployment, probes, and troubleshooting. It does not provide universal hardware-sizing guidance. vLLM: Using Kubernetes |
| KServe LLMInferenceService | A Kubernetes custom resource | You want a model-serving API that brings model, replica, resource, and routing or scheduling configuration together. | KServe documents gateway and route settings, a scheduler, and tensor, data, and expert parallelism. Its sample values illustrate a configuration; they are not general sizing advice. KServe: Understanding LLMInferenceService |
| vLLM production stack | Helm chart | You prefer a packaged vLLM deployment and dashboard-oriented operations. | The project documents a Helm installation path and Grafana observability. A quickstart alone does not establish production suitability for your workload. vLLM: Production stack |
These are different operating approaches, not performance rankings: the available documentation does not provide a comparable benchmark showing that one is faster or cheaper. For the direct path below, use vLLM with native Kubernetes resources.
Check cluster and model prerequisites
Before creating a workload, confirm that the cluster can schedule the resources you intend to request and that the model can be loaded in the environment you have chosen. A GPU request only works if the cluster’s nodes and GPU configuration support it; the KServe example, for instance, requests an NVIDIA GPU. That example does not establish that one GPU is sufficient for your model or traffic.
- Model access: decide how model and tokenizer files will reach the server: for example, through the storage or model-URI approach supported by your chosen deployment. KServe’s example uses an HF model URI. Check access credentials and any model-access requirements before rollout.
- Runtime compatibility: check the selected vLLM image and release against your model, tokenizer, accelerator, and cluster environment. Follow the deployment instructions for that release rather than treating an unpinned
latestimage as a stable production version. - Capacity: size CPU, memory, and accelerator resources for the particular model and workload. The source examples do not establish a universal GPU count, memory amount, or replica count.
For GPU and CPU runtime context, see KServe’s runtime overview. The vLLM Kubernetes guide says: “The use of CPUs here is for demonstration and testing purposes only and its performance will not be on par with GPUs.” Treat CPU deployment accordingly; it is not evidence of GPU-equivalent serving performance.
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Deploy vLLM using native Kubernetes
The vLLM project maintains CPU and GPU examples in its Kubernetes deployment guide. Use the manifest and image instructions for the release you selected: the exact container arguments, storage setup, and resource configuration depend on that deployment, so avoid copying an unversioned snippet without checking it against the current instructions.
- Prepare model access. Configure the storage, model URI, or credentials your chosen approach requires. Ensure the workload can read the model files when it starts; a pod that cannot access them will not complete initialization.
- Create a Deployment. Configure the vLLM server container using the selected guide’s workload instructions. Set the model and runtime options for your chosen model, and request the CPU, memory, and—when applicable—GPU resources the cluster can provide.
- Configure startup and readiness probes. Model initialization can take time. Use the vLLM guide’s probe guidance and set thresholds based on observed startup behavior in your environment. Readiness should indicate that the server is ready to receive requests, not merely that its container process has started.
- Expose the workload with a Service. Create a Kubernetes Service that selects the server pods, then use the cluster’s chosen access path to make that Service reachable by clients. Keep the endpoint’s network exposure aligned with your platform’s access requirements.
Keep deployment mechanics separate from capacity decisions. A Deployment replica count, GPU request, and model-parallel configuration need to match the model and serving goals; the vLLM example does not make any one setting a general recommendation. The native deployment guide also covers probe troubleshooting and alternative integration paths.
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Validate the endpoint before scaling
- Check scheduling and pod state. Inspect the Kubernetes workload and pod status. If the pod remains pending, check scheduling events and whether the requested CPU, memory, or GPU resources are available.
- Review server logs. Follow the container logs through model initialization. A running container is not sufficient evidence that the model has loaded or that the API is ready.
- Wait for readiness. Confirm the readiness probe succeeds before sending traffic. If it fails during startup, compare the observed initialization time with the probe thresholds and inspect the server logs for model-access or initialization errors.
- Send a request through the service endpoint. Use the API format and endpoint expected by the deployed server. The vLLM production-stack guide demonstrates sending an OpenAI-compatible API query after installation; it also shows checking Kubernetes pod status. Adapt its validation instructions to your installation rather than assuming an identical endpoint or configuration.
Do not add replica scaling or distributed inference until this single serving path works and you have a workload-based reason to expand it. Failure to schedule, failure to load model files, slow initialization, and unsuccessful API requests are different problems; use pod events, logs, readiness state, and the client response to locate the stage that is failing.
Independent reader supportYour contribution helps us test, update, and keep practical guides available for everyone.Add routing, scaling, or distributed inference when needed
Start with the simplest arrangement that meets your serving requirements, then add capabilities in response to measured model footprint and workload behavior. More replicas and model parallelism solve different problems: additional replicas provide more server instances, while parallelism distributes model computation. Neither choice should be inferred from an example manifest.
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- Use KServe LLMInferenceService when a declarative model-serving resource and its routing or scheduling configuration fit your platform. Its overview describes gateway and route fields, a scheduler, and tensor, data, and expert parallelism.
- Consider distributed inference when the model or workload calls for parallel execution. KServe’s documentation points to multi-node configuration as a separate topic; plan it against the model and cluster rather than assuming a single-node example applies.
- Plan scale and operations around latency and throughput goals and observed cluster behavior. KServe documents autoscaling and scheduler topics, while the vLLM production stack describes Helm-based deployment and Grafana observability. The available material does not establish universal autoscaling values or performance outcomes.
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