Kubernetes Object

Definition:

• Persistent entities in the Kubernetes system. Kubernetes uses these entities to represent the state of your cluster.
• Idenfied:
  • unique name, can only have 1 object of same name at any moment
  • unique identifier, generated by k8s
• Has:
  • Object spec: desired state
  • Object status: current state of the object, Kubernetes Control Plane continually and actively manages every object’s actual state to match the desured state
• required fields (A-KMS):
  • apiVersion
  • kind: kind of object
    • https://kubernetes.io/docs/reference/kubernetes-api/
    • kubectl api-resources and kubectl explain
  • metadata: data to helps identify
    • name
    • namespace: optional
  • spec: desure state, different for every object

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Object name and Ids

Kubernetes Label and Kubernetes Selector

Kubernetes Namespace

Annotation

• Attaching metadata to objects
  • Unlike labels, annotations are not used to identify and select objects
  • key, values must be string
  • example: build, releases, phone nb, …