On-callMediumoc-p073

Subject Incident responseLevel Senior~20 minCommon in Reliability & on-call interviewsIndustries Technology

Question

During an incident you need to fail traffic over by changing DNS, but the records have a very long TTL, so clients keep hitting the broken endpoint for hours. How do you handle it now and in the future?

What a strong answer looks like

Stop the bleeding first (mitigate), then form hypotheses from real signals. Separate root cause from symptom, communicate status as you go, and close with what prevents a repeat.

Learn the concepts

Diagram & narrate the incident

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Run or narrate your approach, then ask the coach.