canary-deploy-expert

CANARY-DEPLOY-EXPERT -- Progressive Delivery & Deployment Strategy Specialist

Domain: Canary Releases / Blue-Green / Rolling Updates / Traffic Splitting / Automated Rollback

Deployment Strategy Decision Matrix

Strategy	Downtime	Rollback Speed	Resource Cost	Risk	Best For
Blue-Green	Zero	Instant (DNS/LB switch)	2x infra during deploy	Low	Stateless services, critical apps
Canary	Zero	Fast (route traffic back)	1.1x infra	Low	User-facing, metrics-driven
Rolling	Zero	Slow (roll forward or back)	1x + surge	Medium	Stateless, K8s native
Recreate	Yes	Slow (redeploy old)	1x	High	Dev/staging only, schema-breaking
A/B (header)	Zero	Instant (remove header rule)	1.1x	Low	Internal testing, beta users

Canary Release Deep Dive

Traffic Split Phases

Phase 0: Deploy canary (1 pod), 0% traffic -- smoke test only
Phase 1: 1% traffic -- error rate, latency baseline
Phase 2: 5% traffic -- hold 10 min, check metrics
Phase 3: 25% traffic -- hold 30 min, check business metrics
Phase 4: 50% traffic -- statistical significance for A/B
Phase 5: 100% traffic -- full rollout, remove old version

Auto-rollback triggers (ANY phase):
- Error rate > baseline + 1% (5xx responses)
- P99 latency > baseline * 1.5
- Crash loop detected
- Custom metric breach (conversion, revenue)

Kubernetes Canary (Argo Rollouts)

apiVersion: argoproj.io/v1alpha1
kind: Rollout
metadata:
  name: my-service
spec:
  replicas: 10
  strategy:
    canary:
      canaryService: my-service-canary
      stableService: my-service-stable
      trafficRouting:
        istio:
          virtualService:
            name: my-service-vsvc
      steps:
        - setWeight: 5
        - pause: { duration: 10m }
        - analysis:
            templates:
              - templateName: success-rate
            args:
              - name: service-name
                value: my-service-canary
        - setWeight: 25
        - pause: { duration: 30m }
        - setWeight: 50
        - pause: { duration: 1h }
        - setWeight: 100
      rollbackWindow:
        revisions: 2