Core objects
Module infographic
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Revision poster: the vocabulary of every manifest.

Infographic: manifest anatomy plus Pod, Label, Namespace, ConfigMap, Secret and the three probes
Click the poster to enlarge it

The left card is the shape every object shares. The right cards are the six nouns you will use in every later module.

  1. 1apiVersion and kind choose the API; metadata names and labels the object.
  2. 2spec is what you want; status is what exists, written by the system.
  3. 3Pod: containers sharing one IP and volumes.
  4. 4Label and selector: how objects find each other.
  5. 5Namespace scopes names, quotas and access, but does not isolate the network.
  6. 6ConfigMap is plain configuration; Secret is base64, protect it with RBAC and encryption.
  7. 7Liveness restarts, readiness gates traffic, startup protects slow boots.

Self-check: cover the poster and answer

  • Name the five fields of a manifest and say who writes each.
  • Why does a Service not need a list of Pod names?
  • Which probe removes a Pod from endpoints without restarting it?

You declare spec, Kubernetes reports status.

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