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Refactoring a Lambda Monolith to Microservices Using Hexagonal Architecture
- AWS Lambda monoliths have several drawbacks like big package size, hard to enforce least privileges, and hard to test.
- It is recommended to decompose the monolithic Lambda function into individual microservices with each Lambda function dedicated to a single, well-defined task.
- Hexagonal Architecture, also known as the 'Ports and Adapters' approach, offers a way to refactor a Lambda monolith into microservices.
- Hexagonal Architecture allows us to modularize the application so it can be more flexible and maintainable.
- The preferred approach is to decompose the monolithic Lambda function into individual microservices, with each Lambda function dedicated to a single, well-defined task.
- Decomposing a monolith can be done using the 'decompose by business capability' approach.
- The Strangler Pattern allows us to migrate functionality piece by piece, gradually 'strangling' the monolith until it's fully decomposed.
- Hexagonal Architecture implementation is based on three components: Core Logic (Domain), Ports, and Adapters.
- Using Hexagonal Architecture, it's possible to gradually decouple the monolith into smaller and independent microservices to bring many potential benefits.
- Refactoring your Lambda setup with Hexagonal Architecture can transform a complex, tightly coupled monolith into a streamlined, testable and flexible microservice ecosystem providing a solid foundation for future growth.
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