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5.2.3.2. HyperConverged object node placement rule example

5.2.3.2. HyperConverged object node placement rule example

To specify the nodes where OpenShift Virtualization deploys its components, you can edit the nodePlacement object in the HyperConverged custom resource (CR) file that you create during OpenShift Virtualization installation.

Example HyperConverged object with nodeSelector rule:

apiVersion: hco.kubevirt.io/v1beta1
kind: HyperConverged
metadata:
  name: kubevirt-hyperconverged
  namespace: openshift-cnv
spec:
  infra:
    nodePlacement:
      nodeSelector:
        example.io/example-infra-key: example-infra-value
  workloads:
    nodePlacement:
      nodeSelector:
        example.io/example-workloads-key: example-workloads-value

Infrastructure resources are placed on nodes labeled example.io/example-infra-key = example-infra-value.
Workloads are placed on nodes labeled example.io/example-workloads-key = example-workloads-value.

Example HyperConverged object with affinity rule:

apiVersion: hco.kubevirt.io/v1beta1
kind: HyperConverged
metadata:
  name: kubevirt-hyperconverged
  namespace: openshift-cnv
spec:
  infra:
    nodePlacement:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: example.io/example-infra-key
                operator: In
                values:
                - example-infra-value
  workloads:
    nodePlacement:
      affinity:
        nodeAffinity:
          requiredDuringSchedulingIgnoredDuringExecution:
            nodeSelectorTerms:
            - matchExpressions:
              - key: example.io/example-workloads-key
                operator: In
                values:
                - example-workloads-value
          preferredDuringSchedulingIgnoredDuringExecution:
          - weight: 1
            preference:
              matchExpressions:
              - key: example.io/num-cpus
                operator: Gt
                values:
                - 8

Infrastructure resources are placed on nodes labeled example.io/example-infra-key = example-value.
Workloads are placed on nodes labeled example.io/example-workloads-key = example-workloads-value.
Nodes that have more than eight CPUs are preferred for workloads, but if they are not available, pods are still scheduled.

Example HyperConverged object with tolerations rule:

apiVersion: hco.kubevirt.io/v1beta1
kind: HyperConverged
metadata:
  name: kubevirt-hyperconverged
  namespace: openshift-cnv
spec:
  workloads:
    nodePlacement:
      tolerations:
      - key: "key"
        operator: "Equal"
        value: "virtualization"
        effect: "NoSchedule"

Nodes reserved for OpenShift Virtualization components are labeled with the key = virtualization:NoSchedule taint. Only pods with matching tolerations are scheduled on reserved nodes.

5.2.3.2. HyperConverged object node placement rule example

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