Kubeflow

This guide describes how to deploy NVIDIA Inference Microservices (NIMs) on Charmed Kubeflow (CKF) and serve a model with KServe, a component of CKF. A NIM is a containerized inference microservice for running LLMs, distributed from NVIDIA container registry (NGC).

The guide uses Kubeflow v1.9, Kubernetes v1.29, and Juju v3.4. See Supported versions for more details on compatibility among these.

Requirements

• An active CKF deployment and access to the Kubeflow dashboard. See the Get started tutorial for more details.
• A GPU compatible with the model downloaded from NGC. See the model details for further information. This guide is tested using an NVIDIA A100 GPU.
• An NVIDIA NGC API key. See create an NVIDIA account and create an API key for more details.

Configure MicroK8s GPU add-on

Install NVIDIA GPU drivers

See MicroK8s Add-on: gpu documentation to install the NVIDIA drivers and verify that drivers are loaded.

Enable MicroK8s GPU add-on

Enable MicroK8s GPU add-on to enable running NVIDIA GPU workloads.

microk8s enable gpu

Check MicroK8s status as follows:

microk8s status --wait-ready

Wait until the output shows microk8s is running and the gpu add-on is listed under enabled.

Create a Kubeflow notebook

Create a Kubeflow notebook. This notebook is the workspace from which you run commands.

Choose the default notebook image since you will be only using the Command Line Interface (CLI).

Connect to the notebook and start a new terminal from the launcher as shown below:

Use this terminal session to run the commands in the next sections.

Create Kubernetes secrets

From the terminal, export your NGC API key. It will be used in the next steps to create the required K8s secrets:

export NGC_API_KEY=<your_key>

Create a Docker config K8s secret with the NGC API key to pull the image from the NGC private Docker registry as follows:

kubectl create secret docker-registry ngc-secret --docker-server=nvcr.io --docker-username='$oauthtoken' --docker-password=$NGC_API_KEY

Create an opaque K8s secret with the NGC API key to launch NIMs:

kubectl create secret generic nvidia-nim-secret --from-literal=NGC_API_KEY=$NGC_API_KEY

Create Serving Runtime

Create the KServe Serving Runtime YAML to be used as the runtime for the NIMs as follows:

cat <<EOF > "./runtime.yaml"
apiVersion: serving.kserve.io/v1alpha1
kind: ServingRuntime
metadata:
  name: nvidia-nim-llama3-8b-instruct-1.0.0
spec:
  annotations:
    prometheus.kserve.io/path: /metrics
    prometheus.kserve.io/port: "8000"
    serving.kserve.io/enable-metric-aggregation: "true"
    serving.kserve.io/enable-prometheus-scraping: "true"
  containers:
  - env:
    - name: NIM_CACHE_PATH
      value: /tmp
    - name: NGC_API_KEY
      valueFrom:
        secretKeyRef:
          name: nvidia-nim-secret
          key: NGC_API_KEY
    image: nvcr.io/nim/meta/llama3-8b-instruct:1.0.0
    name: kserve-container
    ports:
    - containerPort: 8000
      protocol: TCP
    resources:
      limits:
        cpu: "12"
        memory: 32Gi
      requests:
        cpu: "12"
        memory: 32Gi
    volumeMounts:
    - mountPath: /dev/shm
      name: dshm
  imagePullSecrets:
  - name: ngc-secret
  protocolVersions:
  - v2
  - grpc-v2
  supportedModelFormats:
  - autoSelect: true
    name: nvidia-nim-llama3-8b-instruct
    priority: 1
    version: "1.0.0"
  volumes:
  - emptyDir:
      medium: Memory
      sizeLimit: 16Gi
    name: dshm
EOF

Apply the YAML file to your namespace:

kubectl apply -f runtime.yaml

The runtime above is inspired by the runtimes published in the NVIDIA/nim-deploy repository. Check it out for more details on available NIM runtimes.

Create Inference Service

Define a new Inference Service YAML file using the LLama3 runtime created in the previous step:

cat <<EOF > "./isvc.yaml"
apiVersion: serving.kserve.io/v1beta1
kind: InferenceService
metadata:
  annotations:
    autoscaling.knative.dev/target: "10"
  name: llama3-8b-instruct-1xgpu
spec:
  predictor:
    minReplicas: 1
    model:
      modelFormat:
        name: nvidia-nim-llama3-8b-instruct
      resources:
        limits:
          nvidia.com/gpu: "1"
        requests:
          nvidia.com/gpu: "1"
      runtime: nvidia-nim-llama3-8b-instruct-1.0.0
EOF

Apply the YAML file to your namespace:

kubectl apply -f ./isvc.yaml

Wait until Inference Service is in Ready state.

You can check its state with:

kubectl get inferenceservice llama3-8b-instruct-1xgpu

You should expect an output similar to this:

NAME                       URL                                                         READY   PREV   LATEST   PREVROLLEDOUTREVISION   LATESTREADYREVISION                        AGE
llama3-8b-instruct-1xgpu   http://llama3-8b-instruct-1xgpu.admin.10.64.140.43.nip.io   True           100                              llama3-8b-instruct-1xgpu-predictor-00001   16m

Make a request to the Inference Service

Get the Inference Service status.address.url and save it to a variable:

URL=$(kubectl get inferenceservice llama3-8b-instruct-1xgpu -o jsonpath='{.status.address.url}')

Make a request to the Inference Service URL:

curl $URL/v1/chat/completions -H "Content-Type: application/json" -d '{
"model": "meta/llama3-8b-instruct",
"messages": [{"role":"user","content":"What is Kubeflow?"}]

You should expect an output similar to this:

{"id":"cmpl-c2ec0a9bf1d64172975992f8236fc166","object":"chat.completion","created":1729157204,"model":"meta/llama3-8b-instruct","choices":[{"index":0,"message":{"role":"assistant","content":"Kubeflow is an open-source platform for Machine Learning (ML) on Kubernetes. It allows data scientists and developers to easily build, deploy, and manage machine learning workloads on Kubernetes, a container orchestration system...."},"logprobs":null,"finish_reason":"stop","stop_reason":128009}],"usage":{"prompt_tokens":16,"total_tokens":426,"completion_tokens":410}}

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