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A cluster upgrade has been stuck on one node for forty minutes and the drain never completes. What is holding it?

A drain that hangs without erroring is almost always eviction being refused, and the two refusals that look identical from the outside have opposite fixes.

Updated Sep 2026 · Grounded in researched DevOps, SRE and platform engineering interview loops, written to a senior-engineer editorial bar, and never padded to hit a word count.

A drain that hangs without erroring is almost always eviction being refused, and the two refusals that look identical from the outside have opposite fixes.

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