Diegolden

Topic 1: Container Images

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Topic 1: Container Images

Official baseline: (The Kubernetes Authors, 2026). My working version: An image is a supply chain artifact. Kubernetes can pull it, but you still own versioning, provenance, size, and rollback behavior.

Mental Model

An image is a supply chain artifact. Kubernetes can pull it, but you still own versioning, provenance, size, and rollback behavior.

Notes

  • Prefer immutable tags or digests for anything you care about reproducing.
  • Image pull policy affects startup speed and surprise changes.
  • Small images reduce pull latency and attack surface.

Homelab Angle

Use your homelab to practice registry hygiene: private registry, signed images later, and clear promotion from test to stable.

Verify It

  • Read the object status before changing the manifest.
  • Check events for the controller or node that is actually complaining.
  • Confirm the official source linked below still matches the cluster version you run.

Common Failure Modes

  • Treating the YAML object as the system, instead of one input to a reconciliation loop.
  • Debugging from outside the cluster when the failure only exists inside cluster networking or node state.
  • Forgetting that Kubernetes version, addon version, and runtime behavior are linked.

Sources

  • Images - source path: content/en/docs/concepts/containers/images.md, commit 8cc9e19b8eec8d5cf49eacd66f86a81648edb1a0.
  • Kubernetes documentation is licensed under CC BY 4.0; these notes are original commentary and link back to the official source.
The Kubernetes Authors. (2026). Images. https://kubernetes.io/docs/concepts/containers/images/

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