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Version: v0.3.0

Annotation Based Scheduling

Overview​

Nova currently supports three ways to schedule a workload - annotation-based scheduling, policy based scheduling, and smart scheduling based on resource availability

Annotation Based Scheduling Testing Example​

In annotation-based scheduling, you specify an annotation in the workload manifest. The annotation tells Nova which workload cluster should run the workload.

  1. If you used different names for your clusters, open ./sample-workloads/nginx.yaml and edit annotation nova.elotl.co/cluster: my-workload-cluster-1 by replacing my-workload-cluster-1 with name of one of your workload clusters.
  2. Run KUBECONFIG=./nova-installer-output/nova-kubeconfig kubectl apply -f sample-workloads/nginx.yaml
  3. Run KUBECONFIG=./nova-installer-output/nova-kubeconfig kubectl get deployments should show the nginx deployment is up and running.
  4. Now you should be able to see there are two pods running in your workload cluster.
  5. Note that there will be no pod running in the nova control plane cluster - KUBECONFIG=./nova-installer-output/nova-kubeconfig kubectl get pods should show no pod.

Updating/Deleting through nova​

You can also modify or delete a workload through Nova and nova will automatically update the corresponding objects in the workload cluster. Use the nginx deployment for the example:

  1. Run KUBECONFIG=./nova-installer-output/nova-kubeconfig kubectl edit deployment nginx, and change the replica from 2 to 3.
  2. In your workload cluster, there should be 3 nginx pods running.
  3. Run KUBECONFIG=./nova-installer-output/nova-kubeconfig kubectl get deployments, and you should be able to see 3 replicas running.

Deleting a workload in nova will result in the workload deleted from the workload cluster too:

  1. Run KUBECONFIG=./nova-installer-output/nova-kubeconfig kubectl delete deployment nginx.
  2. You should be able to see the nginx deployment deleted both from nova control plane and your workload cluster.