Deployment Strategies (Blue-Green, Canary, Rolling)

Summary

Blue-green switches all traffic to a fully new environment at once (easy rollback), canary gradually shifts a small percentage of traffic to test a new version, rolling updates replace instances incrementally.

• 1Diagram all 3 deployment strategies and compare their rollback speed and risk profile.
• 2Learn which strategy fits which scenario (canary for gradual risk validation, blue-green for instant rollback).
• 3Understand why 'just deploy and hope' is the strategy all of these are designed to replace.