A company is migrating a monolithic application to a microservices architecture on AWS. They want to migrate gradually without downtime. They plan to route specific API calls to the new microservices while sending the rest to the legacy monolith. Which migration pattern and AWS service combination is MOST appropriate?

Answer options:

Blue/Green deployment using AWS CodeDeploy.

Strangler Fig pattern using Amazon API Gateway.

Canary release using Amazon Route 53.

Lift and shift using AWS Application Migration Service.

How to approach this question

Identify the architectural pattern for gradual monolith refactoring.

Full Answer

B.Strangler Fig pattern using Amazon API Gateway.✓ Correct

The Strangler Fig pattern is the standard approach for migrating monoliths to microservices. Amazon API Gateway acts as the routing layer, directing specific endpoints to new Lambda/ECS services while sending the rest to the legacy backend.

Common mistakes

Confusing Canary (percentage-based) with Strangler Fig (path-based).

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