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Topic 5: Disruptions And Maintenance

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Topic 5: Disruptions And Maintenance

Official baseline: (The Kubernetes Authors, 2026b, 2026a). My working version: A disruption budget tells Kubernetes how much voluntary disruption an app can tolerate.

Mental Model

A disruption budget tells Kubernetes how much voluntary disruption an app can tolerate.

Notes

  • Drains, upgrades, and node maintenance create voluntary disruption.
  • PodDisruptionBudgets protect availability but can also block maintenance.
  • Single-replica apps cannot pretend to be highly available.

Homelab Angle

Practice draining a node monthly. It exposes hidden single points of failure.

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

  • Disruptions - source path: content/en/docs/concepts/workloads/pods/disruptions.md, commit 8cc9e19b8eec8d5cf49eacd66f86a81648edb1a0.
  • DaemonSet - source path: content/en/docs/concepts/workloads/controllers/daemonset.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). DaemonSet. https://kubernetes.io/docs/concepts/workloads/controllers/daemonset/
The Kubernetes Authors. (2026b). Disruptions. https://kubernetes.io/docs/concepts/workloads/pods/disruptions/

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