Compare rolling, blue-green and canary deployments.

Summary

Rolling deployments replace instances gradually; blue-green deploys a full new environment and switches traffic at once (instant rollback by switching back); canary releases send a small percentage of traffic to the new version, watch metrics, then ramp up.

Longer Answer

All require backward-compatible changes because old and new versions run simultaneously (rolling, canary) or the database is shared (blue-green).

Key Points

• Rolling: gradual replacement
• Blue-green: switch environments
• Canary: small % first
• Backward compatibility required

Comparison / Tradeoffs