Production Debugging

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The Debugging Mindset

Section 1 of 12

Production debugging is different from development debugging. You can't set breakpoints, you often can't reproduce the issue easily, and there's pressure to fix it fast. The right mindset is crucial.

Key Principles

  • ✓Stay calm - panic leads to poor decisions and longer resolution times
  • ✓Gather evidence first, hypothesize second - don't jump to conclusions
  • ✓Document everything - you'll need it for the postmortem
  • ✓Communicate early and often - stakeholders need updates
  • ✓Don't make changes without understanding the impact

The Debugging Process

1. Acknowledge the issue and gather initial information

2. Assess severity and impact (P1/P2/P3)

3. Assemble the right people if needed

4. Investigate logs, metrics, and traces

5. Form and test hypotheses

6. Implement fix or workaround

7. Verify the fix in production

8. Document and conduct postmortem

⚠️ Common Mistakes

  • ✗Making changes without proper testing in a rush to fix
  • ✗Not communicating status updates to stakeholders
  • ✗Focusing on symptoms instead of root cause
  • ✗Not preserving evidence (logs, screenshots) before they rotate out

💡 Pro Tip: Create a personal 'war room' checklist before incidents happen. Include: dashboard links, escalation contacts, runbook locations, and common queries. When an incident hits, you won't have time to search for these.