ARO with Nvidia GPU Workloads

ARO guide to running Nvidia GPU workloads.

Prerequisites

• oc cli
• Helm
• jq, moreutils, and gettext package
• An ARO 4.14 cluster

Note: If you need to install an ARO cluster, please read our ARO Terraform Install Guide . Please be sure if you’re installing or using an existing ARO cluster that it is 4.14.x or higher.

Note: Please ensure your ARO cluster was created with a valid pull secret (to verify make sure you can see the Operator Hub in the cluster’s console). If not, you can follow these instructions.

Linux:

sudo dnf install jq moreutils gettext

MacOS:

brew install jq moreutils gettext helm openshift-cli

Helm Prerequisites

If you plan to use Helm to deploy the GPU operator, you will need do the following

1. Add the MOBB chart repository to your Helm

   helm repo add mobb https://rh-mobb.github.io/helm-charts/
   

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2. Update your repositories

   helm repo update
   

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GPU Quota

All GPU quotas in Azure are 0 by default. You will need to login to the azure portal and request GPU quota. There is a lot of competition for GPU workers, so you may have to provision an ARO cluster in a region where you can actually reserve GPU.

ARO supports the following GPU workers:

• NC4as T4 v3
• NC6s v3
• NC8as T4 v3
• NC12s v3
• NC16as T4 v3
• NC24s v3
• NC24rs v3
• NC64as T4 v3

Please remember that when you request quota that Azure is per core. To request a single NC4as T4 v3 node, you will need to request quota in groups of 4. If you wish to request an NC16as T4 v3 you will need to request quota of 16.

1. Login to azure

   Login to portal.azure.com , type “quotas” in search by, click on Compute and in the search box type “NCAsv3_T4”. Select the region your cluster is in (select checkbox) and then click Request quota increase and ask for quota (I chose 8 so i can build two demo clusters of NC4as T4s). The Helm chart we use below will request a single Standard_NC4as_T4_v3 machine.

2. Configure quota

   

Log in to your ARO cluster

1. Login to OpenShift - we’ll use the kubeadmin account here but you can login with your user account as long as you have cluster-admin.

   oc login <apiserver> -u kubeadmin -p <kubeadminpass>
   

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GPU Machine Set

ARO still uses Kubernetes Machinsets to create a machine set. I’m going to export the first machine set in my cluster (az 1) and use that as a template to build a single GPU machine in southcentralus region 1.

You can create the machine set the easy way using Helm, or Manually. We recommend using the Helm chart method.

Option 1 - Helm

1. Create a new machine-set (replicas of 1), see the Chart’s values file for configuration options

   helm upgrade --install -n openshift-machine-api \
       gpu mobb/aro-gpu
   

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2. Switch to the proper namespace (project):

   oc project openshift-machine-api
   

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3. Wait for the new GPU nodes to be available

   watch oc -n openshift-machine-api get machines
   

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   NAME                                                  PHASE     TYPE                   REGION           ZONE   AGE
   xxxx-gpu-aro-gpu-southcentralus-9wnzz   Running   Standard_NC4as_T4_v3   southcentralus   1      11m
   xxxx-master-0                           Running   Standard_D8s_v3        southcentralus   1      64m
   ...
   ...
   

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4. Skip past Option 2 - Manually to Install Nvidia GPU Operator

Option 2 - Manually

1. View existing machine sets

   For ease of set up, I’m going to grab the first machine set and use that as the one I will clone to create our GPU machine set.

   MACHINESET=$(oc get machineset -n openshift-machine-api -o=jsonpath='{.items[0]}' | jq -r '[.metadata.name] | @tsv')
   

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2. Save a copy of example machine set

   oc get machineset -n openshift-machine-api $MACHINESET -o json > gpu_machineset.json
   

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3. Change the .metadata.name field to a new unique name

   I’m going to create a unique name for this single node machine set that shows nvidia-worker- that follows a similar pattern as all the other machine sets.

   jq '.metadata.name = "nvidia-worker-southcentralus1"' gpu_machineset.json| sponge gpu_machineset.json
   

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4. Ensure spec.replicas matches the desired replica count for the MachineSet

   jq '.spec.replicas = 1' gpu_machineset.json| sponge gpu_machineset.json
   

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5. Change the .spec.selector.matchLabels.machine.openshift.io/cluster-api-machineset field to match the .metadata.name field

   jq '.spec.selector.matchLabels."machine.openshift.io/cluster-api-machineset" = "nvidia-worker-southcentralus1"' gpu_machineset.json| sponge gpu_machineset.json
   

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6. Change the .spec.template.metadata.labels.machine.openshift.io/cluster-api-machineset to match the .metadata.name field

   jq '.spec.template.metadata.labels."machine.openshift.io/cluster-api-machineset" = "nvidia-worker-southcentralus1"' gpu_machineset.json| sponge gpu_machineset.json
   

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7. Change the spec.template.spec.providerSpec.value.vmSize to match the desired GPU instance type from Azure.

   The machine we’re using is Standard_NC4as_T4_v3.

   jq '.spec.template.spec.providerSpec.value.vmSize = "Standard_NC4as_T4_v3"' gpu_machineset.json | sponge gpu_machineset.json
   

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8. Change the spec.template.spec.providerSpec.value.zone to match the desired zone from Azure

   jq '.spec.template.spec.providerSpec.value.zone = "1"' gpu_machineset.json | sponge gpu_machineset.json
   

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9. Delete the .status section of the yaml file

   jq 'del(.status)' gpu_machineset.json | sponge gpu_machineset.json
   

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10. Verify the other data in the yaml file.

Create GPU machine set

These steps will create the new GPU machine. It may take 10-15 minutes to provision a new GPU machine. If this step fails, please login to the azure portal and ensure you didn’t run across availability issues. You can go “Virtual Machines” and search for the worker name you created above to see the status of VMs.

1. Create GPU Machine set

   oc create -f gpu_machineset.json
   

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   This command will take a few minutes to complete.

2. Verify GPU machine set

   Machines should be getting deployed. You can view the status of the machine set with the following commands

   oc get machineset -n openshift-machine-api
   oc get machine -n openshift-machine-api
   

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   Once the machines are provisioned, which could take 5-15 minutes, machines will show as nodes in the node list.

   oc get nodes
   

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   You should see a node with the “nvidia-worker-southcentralus1” name it we created earlier.

Install Nvidia GPU Operator

This will create the nvidia-gpu-operator name space, set up the operator group and install the Nvidia GPU Operator.

Like ealier you can do it the easy way with Helm, or the hard way by doing it manually.

Option 1 - Helm

1. Create namespaces

   oc create namespace openshift-nfd
   oc create namespace nvidia-gpu-operator
   

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2. Use the mobb/operatorhub chart to deploy the needed operators

   helm upgrade -n nvidia-gpu-operator nvidia-gpu-operator \
     mobb/operatorhub --install \
     --values https://raw.githubusercontent.com/rh-mobb/helm-charts/main/charts/nvidia-gpu/files/operatorhub.yaml
   

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3. Wait until the two operators are running

   Note: If you see an error like Error from server (NotFound): deployments.apps “nfd-controller-manager” not found, wait a few minutes and try again.

   oc wait --for=jsonpath='{.status.replicas}'=1 deployment \
     nfd-controller-manager -n openshift-nfd --timeout=600s
   

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   oc wait --for=jsonpath='{.status.replicas}'=1 deployment \
     gpu-operator -n nvidia-gpu-operator --timeout=600s
   

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4. Install the Nvidia GPU Operator chart

   helm upgrade --install -n nvidia-gpu-operator nvidia-gpu \
     mobb/nvidia-gpu --disable-openapi-validation
   

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5. Skip past Option 2 - Manually to Validate GPU

Option 2 - Manually

1. Create Nvidia namespace

   cat <<EOF | oc apply -f -
   apiVersion: v1
   kind: Namespace
   metadata:
     name: nvidia-gpu-operator
   EOF
   

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2. Create Operator Group

   cat <<EOF | oc apply -f -
   apiVersion: operators.coreos.com/v1
   kind: OperatorGroup
   metadata:
     name: nvidia-gpu-operator-group
     namespace: nvidia-gpu-operator
   spec:
     targetNamespaces:
     - nvidia-gpu-operator
   EOF
   

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3. Get latest nvidia channel

   CHANNEL=$(oc get packagemanifest gpu-operator-certified -n openshift-marketplace -o jsonpath='{.status.defaultChannel}')
   

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If your cluster was created without providing the pull secret, the cluster won’t include samples or operators from Red Hat or from certified partners. This will result in the following error message:

Error from server (NotFound): packagemanifests.packages.operators.coreos.com “gpu-operator-certified” not found.

To add your Red Hat pull secret on an Azure Red Hat OpenShift cluster, follow this guidance .

1. Get latest nvidia package

   PACKAGE=$(oc get packagemanifests/gpu-operator-certified -n openshift-marketplace -ojson | jq -r '.status.channels[] | select(.name == "'$CHANNEL'") | .currentCSV')
   

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2. Create Subscription

   envsubst  <<EOF | oc apply -f -
   apiVersion: operators.coreos.com/v1alpha1
   kind: Subscription
   metadata:
     name: gpu-operator-certified
     namespace: nvidia-gpu-operator
   spec:
     channel: "$CHANNEL"
     installPlanApproval: Automatic
     name: gpu-operator-certified
     source: certified-operators
     sourceNamespace: openshift-marketplace
     startingCSV: "$PACKAGE"
   EOF
   

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3. Wait for Operator to finish installing

   Don’t proceed until you have verified that the operator has finished installing. It’s also a good point to ensure that your GPU worker is online.

   

Install Node Feature Discovery Operator

The node feature discovery operator will discover the GPU on your nodes and appropriately label the nodes so you can target them for workloads. We’ll install the NFD operator into the opneshift-ndf namespace and create the “subscription” which is the configuration for NFD.

Official Documentation for Installing Node Feature Discovery Operator

1. Set up Name Space

   cat <<EOF | oc apply -f -
   apiVersion: v1
   kind: Namespace
   metadata:
     name: openshift-nfd
   EOF
   

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2. Create OperatorGroup

   cat <<EOF | oc apply -f -
   apiVersion: operators.coreos.com/v1
   kind: OperatorGroup
   metadata:
     generateName: openshift-nfd-
     name: openshift-nfd
     namespace: openshift-nfd
   EOF
   

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3. Create Subscription

   cat <<EOF | oc apply -f -
   apiVersion: operators.coreos.com/v1alpha1
   kind: Subscription
   metadata:
     name: nfd
     namespace: openshift-nfd
   spec:
     channel: "stable"
     installPlanApproval: Automatic
     name: nfd
     source: redhat-operators
     sourceNamespace: openshift-marketplace
   EOF
   

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4. Wait for Node Feature discovery to complete installation

   You can login to your openshift console and view operators or simply wait a few minutes. The next step will error until the operator has finished installing.

5. Create NFD Instance

   cat <<EOF | oc apply -f -
   kind: NodeFeatureDiscovery
   apiVersion: nfd.openshift.io/v1
   metadata:
     name: nfd-instance
     namespace: openshift-nfd
   spec:
     customConfig:
       configData: {}
     operand:
       image: >-
         registry.redhat.io/openshift4/ose-node-feature-discovery@sha256:07658ef3df4b264b02396e67af813a52ba416b47ab6e1d2d08025a350ccd2b7b      
       servicePort: 12000
     workerConfig:
       configData: |
         core:
           sleepInterval: 60s
         sources:
           pci:
             deviceClassWhitelist:
               - "0200"
               - "03"
               - "12"
             deviceLabelFields:
               - "vendor"      
   EOF
   

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6. Verify NFD is ready.

   This operator should say Available in the status

   

Apply nVidia Cluster Config

We’ll now apply the nvidia cluster config. Please read the nvidia documentation on customizing this if you have your own private repos or specific settings. This will be another process that takes a few minutes to complete.

1. Apply cluster config

   cat <<EOF | oc apply -f -
   apiVersion: nvidia.com/v1
   kind: ClusterPolicy
   metadata:
     name: gpu-cluster-policy
   spec:
     migManager:
       enabled: true
     operator:
       defaultRuntime: crio
       initContainer: {}
       runtimeClass: nvidia
       deployGFD: true
     dcgm:
       enabled: true
     gfd: {}
     dcgmExporter:
       config:
         name: ''
     driver:
       licensingConfig:
         nlsEnabled: false
         configMapName: ''
       certConfig:
         name: ''
       kernelModuleConfig:
         name: ''
       repoConfig:
         configMapName: ''
       virtualTopology:
         config: ''
       enabled: true
       use_ocp_driver_toolkit: true
     devicePlugin: {}
     mig:
       strategy: single
     validator:
       plugin:
         env:
           - name: WITH_WORKLOAD
             value: 'true'
     nodeStatusExporter:
       enabled: true
     daemonsets: {}
     toolkit:
       enabled: true
   EOF
   

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2. Verify Cluster Policy

   Login to OpenShift console and browse to operators and make sure you’re in nvidia-gpu-operator namespace. You should see it say State: Ready once everything is complete.

   

Validate GPU

It may take some time for the nVidia Operator and NFD to completely install and self-identify the machines. These commands can be ran to help validate that everything is running as expected.

1. Verify NFD can see your GPU(s)

   oc describe node | egrep 'Roles|pci-10de' | grep -v master
   

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   You should see output like:

   Roles:              worker
                   feature.node.kubernetes.io/pci-10de.present=true
   

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2. Verify node labels

   oc get node -l nvidia.com/gpu.present
   

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   NAME                                                  STATUS   ROLES    AGE   VERSION
   xxxxx-gpu-aro-gpu-southcentralus-9wnzz   Ready    worker   14m   v1.27.10+c79e5e2
   

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3. Wait until Cluster Policy is ready

   Note: This step may take a few minutes to complete.

   oc wait --for=jsonpath='{.status.state}'=ready clusterpolicy \
     gpu-cluster-policy -n nvidia-gpu-operator --timeout=600s
   

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4. Nvidia SMI tool verification

   oc project nvidia-gpu-operator
   for i in $(oc get pod -lopenshift.driver-toolkit=true --no-headers |awk '{print $1}'); do echo $i; oc exec -it $i -- nvidia-smi ; echo -e '\n' ;  done
   

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   You should see output that shows the GPUs available on the host such as this example screenshot. (Varies depending on GPU worker type)

   

5. Create Pod to run a GPU workload

   oc project nvidia-gpu-operator
   cat <<EOF | oc apply -f -
   apiVersion: v1
   kind: Pod
   metadata:
     name: cuda-vector-add
   spec:
     restartPolicy: OnFailure
     containers:
       - name: cuda-vector-add
         image: "quay.io/giantswarm/nvidia-gpu-demo:latest"
         resources:
           limits:
             nvidia.com/gpu: 1
         nodeSelector:
           nvidia.com/gpu.present: true
   EOF
   

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6. View logs

   oc logs cuda-vector-add --tail=-1
   

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   Please note, if you get an error “Error from server (BadRequest): container “cuda-vector-add” in pod “cuda-vector-add” is waiting to start: ContainerCreating”, try running “oc delete pod cuda-vector-add” and then re-run the create statement above. I’ve seen issues where if this step is ran before all of the operator consolidation is done it may just sit there.

   You should see Output like the following (mary vary depending on GPU):

   [Vector addition of 5000 elements]
   Copy input data from the host memory to the CUDA device
   CUDA kernel launch with 196 blocks of 256 threads
   Copy output data from the CUDA device to the host memory
   Test PASSED
   Done
   

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7. If successful, the pod can be deleted

   oc delete pod cuda-vector-add
   

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