Terence Schumacher
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Step-by-Step Kubernetes Deployment Debugging

2 min read

  1. A Deployment’s rollout is stuck at 80% —

    • new pods aren’t becoming Ready.
    • Walk through your diagnostic steps (readiness probe config, resource requests/limits, PodDisruptionBudget interaction, image pull errors).

  2. Explain what happens, step by step, when a node goes NotReady mid-deploy, and how you’d design your deployment tooling to behave safely in that scenario.

  3. You need to roll back a bad deploy that already partially completed across 40 replicas in 3 regions.

    • Walk through exactly what you’d check and do, and how you’d communicate status while it’s in progress.

  4. A terraform apply fails halfway through, creating some resources but not others. What do you check before re-running, and when would you use terraform state surgery instead of just re-applying?

  5. Explain the tradeoffs between a push-based deploy pipeline (CI directly applies to the cluster) and a pull-based GitOps model (a controller reconciles cluster state to match a git repo). Which would you choose for a regulated fintech environment, and why?

  6. Design an alerting rule that distinguishes “a deploy caused this” from “this was already degrading before the deploy” — what data do you need, and how do you avoid both false positives and false negatives?

E. Values / behavioral (graded against Ownership, Customer Obsession, Bias for Action, High Agency) (26–30)

  1. Tell me about a time you owned an ambiguous, unscoped problem end-to-end. What triggered it, what did you specifically do, and what was the measurable outcome?
  2. Describe a time you shipped something imperfect on purpose because speed mattered more than completeness — how did you decide, and what was the follow-up plan?
  3. Tell me about a production incident you were involved in that wasn’t your team’s direct fault, but you took ownership of anyway. What did you do?
  4. Describe a time you disagreed with a technical direction a more senior engineer or your manager had chosen. How did you handle it, and what happened?
  5. Tell me about a time you had to make a call with incomplete information because waiting for certainty would have cost too much time. What was your reasoning, and how did it turn out?