AWS Certified Solutions Architect - Associate
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A company wants to migrate its existing on-premises monolithic application to AWS. The company wants to keep as much of the front-end code and the backend code as possible. However, the company wants to break the application into smaller applications. A different team will manage each application. The company needs a highly scalable solution that minimizes operational overhead.
Which solution will meet these requirements?
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A
Host the application on AWS Lambda. Integrate the application with Amazon API Gateway.
B
Host the application with AWS Amplify. Connect the application to an Amazon API Gateway API that is integrated with AWS Lambda.
C
Host the application on Amazon EC2 instances. Set up an Application Load Balancer with EC2 instances in an Auto Scaling group as targets.
D
Host the application on Amazon Elastic Container Service (Amazon ECS). Set up an Application Load Balancer with Amazon ECS as the target.
Explanation:
Explanation
Correct Answer: D - Host the application on Amazon Elastic Container Service (Amazon ECS). Set up an Application Load Balancer with Amazon ECS as the target.
Here's why this is the best solution:
Key Requirements Analysis:
- Migrate existing monolithic application - The company wants to keep as much code as possible
- Break into smaller applications - Different teams will manage each application
- Highly scalable solution - Needs to handle varying loads
- Minimize operational overhead - Reduce management burden
Why Amazon ECS is the Best Choice:
Containerization Benefits:
- Code Preservation: ECS allows you to containerize your existing monolithic application with minimal code changes. You can package the application in Docker containers, preserving most of your existing codebase.
- Microservices Transition: ECS is ideal for breaking monolithic applications into smaller, independently deployable services. Each team can manage their own containerized application components.
- Team Independence: Different teams can develop, deploy, and scale their specific containerized services independently.
Scalability and Management:
- Auto Scaling: ECS integrates with AWS Auto Scaling to automatically scale services based on demand.
- Load Balancing: Application Load Balancer distributes traffic across multiple ECS tasks, providing high availability and scalability.
- Operational Overhead Reduction: ECS manages container orchestration, scheduling, and cluster management, reducing operational burden compared to managing EC2 instances directly.
Why Other Options Are Less Suitable:
A. AWS Lambda with API Gateway:
- Requires significant code refactoring to fit serverless architecture
- Not ideal for preserving existing monolithic code structure
- Better for event-driven, stateless applications rather than migrating existing monoliths
B. AWS Amplify with Lambda:
- Amplify is primarily for modern web/mobile applications with serverless backends
- Requires major architectural changes
- Not suitable for migrating existing monolithic applications with minimal code changes
C. EC2 with Auto Scaling:
- While scalable, this maintains the monolithic architecture
- Doesn't facilitate breaking into smaller applications managed by different teams
- Higher operational overhead for managing EC2 instances, OS patches, etc.
Additional Benefits of ECS Solution:
- Service Discovery: ECS integrates with AWS Cloud Map for service discovery between microservices
- Monitoring: Integrates with Amazon CloudWatch for comprehensive monitoring
- Security: IAM roles for tasks provide secure access to AWS resources
- Cost Optimization: Can use Fargate launch type for serverless container management
This solution allows the company to gradually decompose their monolith into microservices while maintaining operational efficiency and scalability.
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