Kubernetes Incident Response Playbook: From Detection to Resolution

The Kubernetes Incident Challenge

Kubernetes incidents are uniquely complex. A single pod failure can cascade through services, and the dynamic nature of container orchestration means the environment changes constantly.

Having a structured incident response playbook is essential for reducing MTTR and minimizing blast radius.

Phase 1: Detection

Effective detection starts with the right signals:

Key Metrics to Monitor

• Pod restart count — Indicates crash loops
• Container OOMKilled events — Memory pressure
• Node NotReady status — Infrastructure issues
• Deployment rollout failures — Application issues
• Service endpoint changes — Load balancing problems
• PVC pending states — Storage issues

Alert Priority Levels

• P1 (Critical): Production service down, data loss risk
• P2 (High): Degraded performance, partial outage
• P3 (Medium): Non-critical service affected
• P4 (Low): Warning conditions, no user impact

Phase 2: Triage

Once an alert fires, follow this triage checklist:

1. Acknowledge the alert within 5 minutes
2. Assess blast radius — What services are affected?
3. Check recent deployments — Was anything deployed in the last hour?
4. Review resource metrics — CPU, memory, disk pressure
5. Check node health — Are nodes healthy and schedulable?
6. Review pod events — Look for CrashLoopBackOff, OOMKilled, ImagePullBackOff

Phase 3: Communication

Keep stakeholders informed:

• Open an incident channel (Slack/Teams)
• Post initial assessment within 10 minutes
• Update every 15-30 minutes during active incident
• Identify incident commander and communication lead

Phase 4: Resolution

Common Kubernetes resolution patterns:

CrashLoopBackOff

• Check container logs: kubectl logs <pod> --previous
• Verify configuration and secrets
• Check resource limits

OOMKilled

• Increase memory limits
• Investigate memory leaks
• Review heap dump if available

Node Pressure

• Drain and cordon affected node
• Scale up node pool
• Investigate disk/memory pressure cause

Deployment Rollback

• helm rollback <release> <revision>
• Verify previous version works
• Investigate what changed

Phase 5: Postmortem

Conduct within 48 hours. Document:

• Timeline of events
• Root cause analysis
• What went well / what didn't
• Action items with owners

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