Microservices – do onething and do it well
- Microservices focus more on decoupling an application, and the communication mechanism is lightweight and typically http.
- Large complex applications can be broken down into components with bounded context to build a generic service.
- Application like ecommerce can be broken down into multiple microservices such as
- User signup
- Inventory
- Order Management
- Order Tracking Management
- Invoice Generator
- Docker containers and Orchestration tools like k8s are very popular over here.
Nano Services
- Nano services helps in breaking down microservcies into operations.
- This is where the serverless technologies like AWS Lambda/Azure functions can be very handy.
Prereq’s for AWS Lambda
AWS Lambda Basics
- Function:
- this is piece of your own code that executes every time it is triggered by an event.
- This function can be written in different programming languages. Refer Here for the specific versions of the runtimes
- Node js
- Python
- Ruby
- Java
- Go
- C#
- Powershell
Anatomy of Lambda function
- Handler function: This is entry point for all Lambda functions. Whenever the function executes, the service calls the handler function and passes in some event data and useful objects
- Node Js
exports.handler = function(event, context, callback) {
callback(null, 'executed succesfully')
}
def handler(event, context):
return "executed successfully"
public string Handler(string input, ILambdaContext context) {
return "executed successfully";
}
public String handler(InputStream inputStream, OutputStream outputStream, Context context) {
return "executed Successfully";
}
- Context object in python has the following structure Refer Here
Lets install Boto3
Java AWS SDK
Next Steps:
- We will write aws lambda function to shutdown all the ec2 instances
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