Learn with me AWS

 Lambda, | cloud watch | API - Gateway are some of the serverless service.

why we need the OS, to run a code . we took the example for web app. 

Write a code in php language. if we need to run php then we need the php interpretor

the code work as webapp  in php, so we need to setup a webserver also . if we need to run the application in EC2 - technically in real world we need to do many things.

Plan is => Launch EC2 Instance => 

lambda function.

import json

def lambda_handler(event, context):

    # TODO implement

    return {

         'statusCode': 200,

          'body': json.dumps('Hello from manickaSundaram!')

    }

API Gateway :-  what is APIgateway. 

Compare it with google search . contact to google by - google.com

but it goes to google.com/search so here "search" is the program(code) that is running. in google server.

its an interface to run the program search 

its called "Application programing interface" - API

Gateway is the one used to run "search" so naming it as API- Gateway.- putting it before the server.

in the API gateway we create the "route/name" its one of the use to understand api gateway.

AWS Provide the service known as "API Gateway". huge network traffic. - haproxy => is similar kind of API gateway.

backend server may be EC2 / Lambda/... app available.

EVENT Driven Architecture :- EDA

Example - e-commerce - after selling - buy button - pay amount .

success event , => sent mail

fail event => sent another e-mail

any thing changes in AWS for example EC2 , change the state from running to stopped, its an event . it act as a trigger to sent sns