Building Serverless Microservices on AWS

Microservices has been a key trend in software architecture. Let’s discuss what microservices are and what is Microservices Architecture.

I’ll give you the standard definition of Microservices Architecture, first.

The idea of microservices architecture is to take a large complex system and break it down into independent decoupled services that are easy to manage and extend.

Microservices are an approach to software development where software is composed of small, independent services that communicate over a well-defined API. These services are generally owned by small self-contained teams.

Microservices architecture makes your applications easier to scale and faster to develop, enabling innovation and accelerating time to market for new features.

Each service performs a single specific function and because they’re independent of each other, they can be run, deployed, updated independently to meet the demands of your application.

Microservices have two specific characteristics.

‘Autonomous’ means each service can be deployed, developed, maintained, and updated independent of other services, and without affecting the functionality of other services. These services also do not share their code or implementation with other services. They simply communicate over well-defined APIs.

‘Specialized’ means each service performs a single specific function. If developers add more code to a service over time making it complex, it can then be broken down into smaller services.

Now let’s discuss some of the benefits of using microservices.

Let’s quickly understand how AWS Lambda and API Gateway can help. AWS Lambda enables you to run your code without having to manage any servers. You simply upload your code to Lambda and Lambda takes care of the rest, enabling your application to run on highly-available and highly-scalable infrastructure. Each piece of code that you upload to Lambda is called as a Lambda Function, and it runs as an independent, self-contained microservice.

API Gateway allows you to expose your code running in AWS Lambda in the form of RESTful APIs. RESTful APIs are the APIs that follow a client-server model, where client is stateful but server is completely stateless. Again, API Gateway is a fully-managed service and can support thousands of concurrent API calls. It also allows you fine-grained access control and version management capabilities. These APIs can then be consumed by your mobile, web or IoT applications, allowing you to interact with different AWS services through your code running in AWS Lambda.

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