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Version: v1.1

AKS

Luna AKS Testing Tutorials​

A few very basic test examples can be used to validate the functionally and operation of Luna.

ML Use-Cases /w NVIDIA gpu​

By default, Luna will autoscale pods with the label elotl-luna=true. Kindly execute the following command kubectl apply -f followed by the provided YAML file. You will observe a pod running and completing its execution on a Standard_NC4as_T4_v3 instance (which has nvidia t4 GPU)..

Upon completion of the pod, the corresponding node will be automatically terminated.

cat <<EOF | kubectl apply -f -
apiVersion: v1
kind: Pod
metadata:
  name: gpu-test
  annotations:
    node.elotl.co/instance-gpu-skus: "t4"
  labels:
    elotl-luna: "true"
spec:
  restartPolicy: OnFailure
  containers:
    - name: cuda-vector-add
      image: "k8s.gcr.io/cuda-vector-add:v0.1"
      resources:
        limits:
          nvidia.com/gpu: 1
EOF

You can monitor the creation of the new pod and node by running the command watch kubectl get pods,nodes. The test pod will only be active for a brief period after it starts. The GPU node that was added to support the pod will persist for a few more minutes.

To confirm the presence of a GPU on the node, you can run the kubectl describe node command and look for the "nvidia.com/gpu" entry or alternatively, you can run the following command:

kubectl get nodes "-o=custom-columns=NAME:.metadata.name,KUBELET STATUS:.status.conditions[3].reason,CREATED:metadata.creationTimestamp,VERSION:.status.nodeInfo.kubeletVersion,NVIDIA GPU(s):.status.allocatable.nvidia\.com/gpu"

General Testing (non-ML)​

Luna will attempt to consolidate multiple smaller pods onto a newly deployed node, or in the case of larger pods, it will allocate a dedicated node for the pod, as occurs with the bin-selection packing mode.

You can perform simple testing using busybox or other pods of varying sizes. The following YAML files can be utilized, and the number of pods can be adjusted to observe Luna's dynamic response.

Small busybox deployment

Several busybox pods will be co-located within a single node

busybox

cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: busybox
spec:
  replicas: 6
  selector:
    matchLabels:
      app: busybox
  template:
    metadata:
      labels:
        app: busybox
        elotl-luna: "true"
    spec:
      containers:
        - name: busybox
          image: busybox
          resources:
            requests:
              cpu: 200m
              memory: 128Mi
            limits:
              cpu: 300m
              memory: 256Mi
          command:
            - sleep
            - "infinity"
EOF

Larger busybox deployment

A single busybox pod will hit the threshold for bin-selection and be located on its own node

busybox-large

cat <<EOF | kubectl apply -f -
apiVersion: apps/v1
kind: Deployment
metadata:
  name: busybox-large
spec:
  replicas: 1
  selector:
    matchLabels:
      app: busybox-large
  template:
    metadata:
      labels:
        app: busybox-large
        elotl-luna: "true"
    spec:
      containers:
        - name: busybox-large
          image: busybox
          resources:
            requests:
              cpu: 4
              memory: 256Mi
            limits:
              cpu: 6
              memory: 512Mi
          command:
            - sleep
            - "infinity"
EOF

Check that the pods have started, the -o wide opton will show which does the pods are running on:

kubectl get pods -l elotl-luna=true -o wide

Sample output

NAME                             READY   STATUS    RESTARTS   AGE     IP            NODE                                NOMINATED NODE   READINESS GATES
busybox-65cb45c86b-9s2hq         1/1     Running   0          11m     10.244.10.3   aks-b4ms-32307050-vmss000000        <none>           <none>
busybox-65cb45c86b-bls4r         1/1     Running   0          11m     10.244.10.7   aks-b4ms-32307050-vmss000000        <none>           <none>
busybox-65cb45c86b-d9z9g         1/1     Running   0          11m     10.244.10.8   aks-b4ms-32307050-vmss000000        <none>           <none>
busybox-65cb45c86b-dnkq2         1/1     Running   0          11m     10.244.10.9   aks-b4ms-32307050-vmss000000        <none>           <none>
busybox-65cb45c86b-ggpgr         1/1     Running   0          11m     10.244.10.4   aks-b4ms-32307050-vmss000000        <none>           <none>
busybox-65cb45c86b-gp8c6         1/1     Running   0          11m     10.244.10.5   aks-b4ms-32307050-vmss000000        <none>           <none>
busybox-large-789c68dc46-p258f   1/1     Running   0          5m21s   10.244.11.3   aks-pd1c22cc5-15317834-vmss000000   <none>           <none>

Next, we can verify the node information to confirm which instance types were selected and added to the Kubernetes cluster by Luna.

kubectl get nodes "-o=custom-columns=NAME:.metadata.name,KUBELET STATUS:.status.conditions[3].reason,CREATED:.metadata.creationTimestamp,VERSION:.status.nodeInfo.kubeletVersion,INSTANCE TYPE:.metadata.labels.node\.kubernetes\.io/instance-type,CPU(S):.status.capacity.cpu,MEMORY:.status.capacity.memory" --sort-by=metadata.creationTimestamp

Sample output

NAME                                KUBELET STATUS            CREATED                VERSION   INSTANCE TYPE     CPU(S)   MEMORY
aks-agentpool-25414935-vmss000001   ContainerRuntimeIsUp      2023-02-28T23:04:36Z   v1.24.9   Standard_DS2_v2   2        7116272Ki
aks-agentpool-25414935-vmss000000   ContainerRuntimeIsUp      2023-02-28T23:05:31Z   v1.24.9   Standard_DS2_v2   2        7116272Ki
aks-b4ms-32307050-vmss000000        KubeletHasSufficientPID   2023-03-26T21:04:08Z   v1.24.9   Standard_B4ms     4        16393240Ki
aks-pd1c22cc5-15317834-vmss000000   KubeletHasSufficientPID   2023-03-26T21:09:25Z   v1.24.9   Standard_B8ms     8        32882796Ki