Theory · Troubleshooting & incident response

16 min · Module 13 · Theory

How to study this topic

Read the theory below (concepts, bullets, and shell/YAML examples).
Try the Exam pool and Book quizzes in this module.
After each quiz, use Show answer on every question to review.

Troubleshooting & incident response

Follow runbooks: assess impact, mitigate (rollback/scale), communicate, root-cause after stability. Use metrics/logs/traces to narrow blast radius — CrashLoopBackOff, OOM, disk full, dependency timeout.

MTTR: detect, diagnose, fix, verify — practice game days.
Postmortem: timeline, root cause, action items with owners.
Rollback: fastest mitigation when deploy caused regression.

Shell, YAML & config examples

# K8s triage
kubectl get events --sort-by='.lastTimestamp'
kubectl describe pod $POD
kubectl logs $POD --previous   # crashed container

Hands-on practice: /lab/