Canary releases gradually roll out changes to a subset of users before full deployment.
Canary vs Blue-Green
Blue-Green: 100% traffic switch
┌──────────┐ ┌──────────┐
│ v1.0.0 │ ──▶ │ v2.0.0 │
│ 100% │ │ 100% │
└──────────┘ └──────────┘
Canary: Gradual traffic shift
┌──────────┬──────────┐
│ v1.0.0 │ v2.0.0 │
│ 95% │ 5% │ ← Start
└──────────┴──────────┘
↓
┌──────────┬──────────┐
│ v1.0.0 │ v2.0.0 │
│ 50% │ 50% │ ← Progress
└──────────┴──────────┘
↓
┌──────────┬──────────┐
│ v1.0.0 │ v2.0.0 │
│ 0% │ 100% │ ← Complete
└──────────┴──────────┘
Kubernetes with Istio
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Flagger Automated Canary
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Custom Canary Controller
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User-Based Canary
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Feature Flag Integration
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Monitoring and Alerting
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Canary releases reduce risk by catching issues before they affect all users.