Diegolden

Topic 2: Cluster Lifecycle

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Topic 2: Cluster Lifecycle

Official baseline: (The Kubernetes Authors, 2026a, 2026b). My working version: Cluster lifecycle is the repeatable path to install, upgrade, repair, and replace the platform.

Mental Model

Cluster lifecycle is the repeatable path to install, upgrade, repair, and replace the platform.

Notes

  • Upgrades are operational events, not package updates.
  • etcd backup and restore should be practiced before an incident.
  • Node replacement should be boring.

Homelab Angle

Keep bootstrap notes executable enough that a tired version of you can rebuild the cluster.

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

  • Cluster Administration - source path: content/en/docs/concepts/cluster-administration/_index.md, commit 8cc9e19b8eec8d5cf49eacd66f86a81648edb1a0.
  • Kubernetes Components - source path: content/en/docs/concepts/overview/components.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. (2026a). Cluster Administration. https://kubernetes.io/docs/concepts/cluster-administration/
The Kubernetes Authors. (2026b). Kubernetes Components. https://kubernetes.io/docs/concepts/overview/components/

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