Answer Key: Canary Deployments & Rollouts

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Exercise 1: Design Canary

Question: Design a canary deployment process. What percentage? How long?

Answer

Canary Design: - Percentage: 5% traffic - Duration: 30 minutes monitoring - Metrics: Error rate, latency, SLOs - Decision: Proceed if metrics OK, rollback if issues

Answer: 5% traffic, 30 minutes monitoring, check error rate/latency/SLOs, proceed or rollback.

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Exercise 2: Handle Canary Failure

Question: Your canary shows issues. How do you respond?

Answer

Response: 1. Detect: Detect issues in canary metrics 2. Rollback: Rollback canary immediately 3. Investigate: Investigate root cause 4. Fix: Fix issues before retry

Answer: Detect issues, rollback immediately, investigate root cause, fix before retry.

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Exercise 3: Plan Rollout

Question: Plan a gradual rollout. What are the phases?

Answer

Rollout Phases: 1. Canary: 5% traffic, 30 minutes 2. Phase 1: 25% traffic, 15 minutes 3. Phase 2: 50% traffic, 15 minutes 4. Phase 3: 100% traffic, 1 hour

Answer: Canary (5%) → 25% → 50% → 100%, monitor at each phase.