AWS Certified Cloud Practitioner

Explanation

Refactor is the correct migration strategy when converting a monolithic application into microservices architecture.

Why Refactor is Correct:

1. Microservices Transformation: Refactoring involves re-architecting the application to improve its structure, performance, and scalability. Converting a monolithic application to microservices requires significant architectural changes, which aligns with the refactor strategy.

2. AWS 6 R's of Migration:

   • Rehost (Lift and Shift): Moving applications without changes

   • Replatform (Lift, Tinker, and Shift): Making minor optimizations

   • Repurchase: Switching to a different product

   • Refactor (Re-architect): Reimagining the application architecture

3. Business Goal Alignment: The company specifically wants to "modernize and convert a monolithic application into microservices," which requires fundamental architectural changes rather than just moving the application to the cloud.

Other Options Explained:

• Rehost: Simply moving the application to AWS without architectural changes (not suitable for microservices conversion)

• Replatform: Making minor optimizations but keeping the monolithic structure (not sufficient for microservices)

• Repurchase: Buying a new solution (not applicable to converting existing application)

AWS Best Practice**:

When migrating to microservices on AWS, companies typically use services like:

• AWS Lambda for serverless functions

• Amazon ECS/EKS for container orchestration

• Amazon API Gateway for API management

• AWS Fargate for serverless containers

This approach allows for independent scaling, faster deployment, and better fault isolation compared to monolithic architectures.