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Island 5 · Cluster Maintenance · Port 5.1

Drain, cordon, uncordon

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Patch a node without taking your app down.
You'll learn to

patch a node safely

Recap

  1. 1drain = cordon + evict pods (gracefully)
  2. 2Blockers: DaemonSets, bare pods, emptyDir, PDBs
  3. 3cordon only stops NEW pods
Check yourself

You cordon a node that runs three pods. What happens to them?

5.1

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