Monday morning, kubectl fails certificate verification against a cluster nobody touched in a year. Where do you start?

Every client fails at once, which rules out pods and points at shared PKI. Know which certificates share one expiry clock, and the ten-minute fix that avoids a rebuild.

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.

Every client fails at once, which rules out pods and points at shared PKI. Know which certificates share one expiry clock, and the ten-minute fix that avoids a rebuild.

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