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41 lines
1.7 KiB
Plaintext
41 lines
1.7 KiB
Plaintext
// Module included in the following assemblies:
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//
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// * virt/virtual_machines/advanced_vm_management/virt-specifying-nodes-for-vms.adoc
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[id="virt-example-vm-node-placement-node-affinity_{context}"]
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= Example: VM node placement with node affinity
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In this example, the VM must be scheduled on a node that has the label `example.io/example-key = example-value-1` or the label `example.io/example-key = example-value-2`. The constraint is met if only one of the labels is present on the node. If neither label is present, the VM is not scheduled.
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If possible, the scheduler avoids nodes that have the label `example-node-label-key = example-node-label-value`. However, if all candidate nodes have this label, the scheduler ignores this constraint.
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.Example VM manifest
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[source,yaml]
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----
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metadata:
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name: example-vm-node-affinity
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apiVersion: kubevirt.io/v1alpha3
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kind: VirtualMachine
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spec:
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affinity:
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nodeAffinity:
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requiredDuringSchedulingIgnoredDuringExecution: <1>
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nodeSelectorTerms:
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- matchExpressions:
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- key: example.io/example-key
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operator: In
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values:
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- example-value-1
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- example-value-2
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preferredDuringSchedulingIgnoredDuringExecution: <2>
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- weight: 1
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preference:
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matchExpressions:
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- key: example-node-label-key
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operator: In
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values:
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- example-node-label-value
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...
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----
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<1> If you use the `requiredDuringSchedulingIgnoredDuringExecution` rule type, the VM is not scheduled if the constraint is not met.
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<2> If you use the `preferredDuringSchedulingIgnoredDuringExecution` rule type, the VM is still scheduled if the constraint is not met, as long as all required constraints are met. |