Serverless Workshop

with Apache OpenWhisk, an open source, distributed Serverless platform

Upkar Lidder

@lidderupk

ulidder@us.ibm.com

https://slides.com/upkar/vancouver-serverless

Workshop - http://bit.ly/serverless-think-labs

IBM CLI - http://bit.ly/ibmcloudcli-standalone

Pre-requisites

Plugin - https://cloud.ibm.com/functions/learn/cli

IBM Cloud sign up - http://bit.ly/serverless-vancouver

http://tirefi.re/serverless/

@lidderupk

IBM Developer

What is Serverless

Serverless computing refers to the concept of building and running applications that do not require server management.

It describes a finer-grained deployment model where applications, bundled as one or more functions, are uploaded to a platform and then executed, scaled, and billed in response to the exact demand needed at the moment.

It refers to the idea that consumers of serverless computing no longer need to spend time and resources on server provisioning, maintenance, updates, scaling, and capacity planning. Instead, all of these tasks and capabilities are handled by a serverless platform and are completely abstracted away from the developers.

Cloud Native Computing Foundation

https://github.com/cncf/wg-serverless/tree/master/whitepapers/serverless-overview

@lidderupk

IBM Developer

Use Cases

Secure and scalable APIs
- API Gateway ➸ Function
- HTTP level scaling

Backend services / micro services
- function/service level scaling
- polyglot functions

Event Driven Programming
- Changes in database
- Social events

@lidderupk

IBM Developer

Leans well to ...

Small, focused, asynchronous, concurrent, easy to parallelize into independent units of work

Infrequent or has sporadic demand, with large, unpredictable variance in scaling requirements

Stateless, ephemeral, without a major need for instantaneous cold start time

Highly dynamic in terms of changing business requirements that drive a need for accelerated developer velocity

@lidderupk

IBM Developer

Example - Conference App

@lidderupk

IBM Developer

IBM Code Patterns

@lidderupk

IBM Developer

https://developer.ibm.com/patterns

Serverless Landscape

Hosted

Installable

https://github.com/cncf/landscape#serverless

@lidderupk

IBM Developer

Serverless Landscape

Amazon Lambda

•Node.js, Python, Java, C# and Go

IBM Cloud Functions

•Node.js 8, Node.js 6, Python 3.6.4, Python 3.6.1, PHP 7.1, PHP 7.2, and Swift 4, Swift 3.1.1, Ruby 2.5, Docker

•Recent change – 2GB max memory and 10 minutes run limit.

Microsoft Azure

•C#, F#, Node.js (in GA), Java, Python, PHP, TypeScript, Bash, PowerShell (experimental mode)

Google Cloud Function

•Node.js, Python

This space is constantly changing !

@lidderupk

IBM Developer

Apache OpenWhisk

Apache OpenWhisk is an open source, distributed Serverless platform that supports a programming model in which developers write functional logic (called Actions), in any supported programming language, that can be dynamically scheduled and run (with Rules) in response to associated events (via Triggers) from external sources ( Feeds) or from HTTP requests.

@lidderupk

IBM Developer

Apache OpenWhisk

Packages

@lidderupk

IBM Developer

Solid Foundations

Leverages existing opensource solutions

@lidderupk

IBM Developer

Solid Foundations

Leverages existing opensource solutions

@lidderupk

IBM Developer

Built on Open Source

@lidderupk

IBM Developer

WSK CLI

@lidderupk

IBM Developer

WSK SYSTEM PACKAGES

@lidderupk

IBM Developer

WSK SYSTEM PACKAGES

@lidderupk

IBM Developer

Apache OpenWhisk (create)

wsk action create helloJava target/hello-world-java.jar --main com.example.FunctionApp

@lidderupk

IBM Developer

Apache OpenWhisk (invoke)

wsk action invoke --result helloJava --param name World

@lidderupk

IBM Developer

Apache OpenWhisk (js)

Entry point

Object In

Object Out

@lidderupk

IBM Developer

Apache OpenWhisk (js)

@lidderupk

IBM Developer

Apache OpenWhisk - more real example

1user registers

2tail logs

3SMS

4email

@lidderupk

IBM Developer

@lidderupk

IBM Cloud - http://bit.ly/serverless-portland

Apache OpenWhisk - more real example

https://github.com/lidderupk/openwhisk-registration/tree/master/javascript

@lidderupk

IBM Developer

Composition / Orchestration

CONDITION Action Name

Code

THEN Action Name

Code

ELSE Action Name

Code

@lidderupk

IBM Developer

Composition / Orchestration

@lidderupk

IBM Developer

wskdeploy

@lidderupk

IBM Developer

So much more ...

More Compositions - Use higher-level programming constructs to declaratively chain together multiple actions.
- while, repeat, let, retry, try, if, etc