Serverless Microservices

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HOW SMALL CAN YOU GO? MICROSERVICES SERVERLESS (WITH AWS ) LAMBDA Niko Köbler So ware-Architect, Developer & Trainer | | niko@n-k.de www.n-k.de @dasniko

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@dasniko

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DISCLAIMER This is silver bullet, NO no standard, but opinionated!

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SERVERLESS

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This is what actually mean... serverless

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It's all about the of servers! management

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HOW COULD THIS HAPPEN? We had... Monoliths Distributed Monoliths Self-contained Systems Microservices Bounded Contexts PaaS BaaS

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...and now, finally, we have... F S AA Function as a Service

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FUNCTIONS Running own code (function) in an external, sandboxed, stateless (and transient) compute container. No application server, no embedded server no Docker ;-)

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? PAAS

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PaaS FaaS vs. is as DevOps NoOps vs.

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AWS LAMBDA

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AWS LAMBDA Event Driven JVM-based languages (Java 8), JavaScript (Node.js), Python, (more to come) AWS Libraries are available at runtime Versions, Aliases via ARNs calculating time based costs, 100ms blocks (e.g. 100ms w/ 128MB memory = USD 0.000000208)

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AWS LAMBDA EXAMPLE NODE exports.handler = (event, context) => { console.log('Received event:', JSON.stringify(event)); }

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AWS LAMBDA EXAMPLE JAVA public class ImageProcessor implements RequestHandler { @Override public Void handleRequest(S3Event s3Event, Context context) { // get the S3 event data from the event request S3EventNotification.S3EventNotificationRecord record = s3Event.getRecords().get(0); // your code goes here... // return an object with specified type (see class generics) return null; } }

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AWS EVENTS LAMBDA S3 Cloud Watch Config DynamoDB Cloud Formation Kinesis Cognito SES Cron AWS IoT SNS API Gateway (no complete list)

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GATEWAY API

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GATEWAY API "Reverse Proxy" hides possible multiple service calls (aka "service composition", ESB?) distributes requests to proper service instances "Mock" services

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API GATEWAY NETFLIX

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GATEWAY API "Reverse Proxy" hides possible multiple service calls (aka "service composition", ESB?) distributes requests to proper service instances "Mock" services

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GATEWAY API AUTHENTICATION / AUTHORIZATION AWS Cognito / STS Custom Authorizer (Lambda Function, returning IAM policies)

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API GATEWAY AUTHORIZATION

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GATEWAY API

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CASES USE

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SERVERLESS ARCHITECTURE WEB

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API Gateway with , Push and SNS SQS

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TESTING

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TESTING UNIT TESTS Functions are easy to test, stateless and little to no dependencies

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TESTING INTEGRATION TESTS Environment, Infrastructure max. 1000 parallel running Lambdas

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COMPETITORS?

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COMPETITOR GOOGLE CLOUD FUNCTIONS JavaScript

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COMPETITOR MICROSOFT AZURE FUNCTIONS JavaScript, C#, Python, PHP

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ON ? PREMISE

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COMPETITOR IBM BLUEMIX OPENWHISK Bluemix Cloud & OnPremise Open Source / Apache License v2.0 JavaScript (Node.js), Java (?) Python and... Swi ! Docker Support Function-Chaining

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IBM OPENWHISK LET'S GET STARTED $ git clone https://github.com/openwhisk/openwhisk.git $ cd openwhisk/tools/vagrant $ vagrant up

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IBM OPENWHISK JAVASCRIPT EXAMPLE function main(params) { return {payload: 'Hello, ' + params.name}; } Create the action in OpenWhisk $ wsk action create hello hello.js Run the action $ wsk action invoke hello --blocking --result --param name Niko Result { "payload": "Hello, Niko" }

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DRAWBACKS Overview: Documentation, Logging & Monitoring, Metrics ! (typical things for distributed environments) Cloud Provider Binding / Dependency: APIs, Portability, Costs, SLAs

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DRAWBACK LATENCY https://twitter.com/patrickdebois/status/795355324987375616

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DRAWBACK LATENCY https://www.prerender.cloud/lambda-latency

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? CURIOUS WANT TO START? Give a try! serverless.com

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SERVERLESS.COM # Install serverless globally $ npm install serverless -g # Create an AWS Lamdba function in Node.js $ serverless create --template aws-nodejs # Deploy to live AWS account $ serverless deploy # Function deployed! $ http://api.amazon.com/users/update "Powered by AWS Lambda"

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BUT POWERFUL SERVERLESS No need to run/manage Application Servers Fast results, minimal eﬀort, minimal TTM(!) Low costs, minimal financial risk Automatic Scalabiltiy and Availability "out-of-the-box"

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THANK ! YOU ANY ? QUESTIONS Niko Köbler So ware-Architect, Developer & Trainer | | niko@n-k.de www.n-k.de @dasniko

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LINKS AWS Lambda: Amazon API Gateway: Google Cloud Functions: Microso Azure Functions: IBM OpenWhisk: IBM OpenWhisk SourceCode: Serverless Framework: https://aws.amazon.com/lambda https://aws.amazon.com/api- gateway https://cloud.google.com/functions https://azure.microso .com/services/functions https://developer.ibm.com/openwhisk https://github.com/openwhisk/openwhisk http://serverless.com