apiVersion

apiVersion defines which version of the Kubernetes API you are using.

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Kubernetes evolves over time:

• Features change
• APIs are updated
• Some versions are deprecated

So you must specify the correct version.

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• Pods → v1
• Services → v1
• Deployments → apps/v1
• Ingress → networking.k8s.io/v1

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apiVersion: apps/v1

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apiVersion = “which Kubernetes API understands this object”