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Your journey into the serverless world

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In this session we will start to see What is Serverless and what it means to you ? Knowing that we will continue our journey to quickly deploy a serverless platform Apache OpenWhisk on Kubernetes. Having platform ready we will then demystify what should be your Java Programming model in the serverless world???. Is this enough for me to build my serverless applications, the answer is !!!NO!!! , then what else is required, “TOOLS” , in the last part of this session we will stock check our inventory of tools that can make the serverless journey quick, easy and productive.

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Your journey into the serverless world

  1. 1. Your Journey into the Serverless World Introduction to Serverless bit.ly/faas-tutorial https://learn.openshift.com/serverless
  2. 2. Who am I ? ● Active Open Source Contributor ○ OpenWhisk ○ Eclipse Che ○ fabric8 Platform https://fabric8.io/ ● Creator vert.x-maven-plugin → https://vmp.fabric8.io/ kameshsampath Kamesh Sampath Director of Developer Experience at Red Hat @kamesh_sampath kamesh.sampath@hotmail.com
  3. 3. 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. https://www.cncf.io/blog/2018/02/14/cncf-takes-first-step-towards-serverless-computing
  4. 4. Good and Bad about Serverless ● Automatic Scalability ● Automatic Cost Reduction ● Quicker and Easier Development ● Better Capacity planning ● Delivery speed ● Debugging ● Deployment and Architectural complexity ● Deep learning curve ● Vendor Lock-in ● Monitoring https://hackernoon.com/serverless-survey-77-delivery-speed-4-dev-workdays-mo-saved-26-aws-monthly-bill-d99174f70663
  5. 5. Apache OpenWhisk ● Open Source incubating under Apache ● A Cloud platform to execute functions written in: ○ JavaScript ○ Swift ○ Java ○ Python ○ PHP ○ Docker ○ Go ● Deployable on ○ Any platform where docker can be run ○ Kubernetes/OpenShift
  6. 6. Some theory ● Actions ○ A stateless code snippet that gets executed ● Package ○ A bundle of actions and feeds synonymous to Java Packages ● Feeds ○ Acts as Interface between external Event Sources and OpenWhisk Actions ● Triggers ○ Stimulus of external Events via Feeds ● Rules ○ Ties one or more Triggers to an Action or vice-versa ● Activation ○ Records the output/response of Running/Ran actions
  7. 7. Tooling ● wsk ○ The core command line interface to work OpenWhisk ● wskdeploy ○ The command line tool to allow deploying OpenWhisk actions, functions etc., using YAML base manifest ● Maven (only for Java) ○ Generate OpenWhisk Java Functions ● Serverless Framework ○ JavaScript based template framework ○ Support for generating OpenWhisk Templated project ○ Ability to deploy functions to OpenWhisk
  8. 8. Invocation Patterns ASYNCHRONOUS SYNCHRONOUS SCHEDULED
  9. 9. Apache OpenWhisk - How does it work ? Controller Kafka nginx Invoker Invoker
  10. 10. Get the feel
  11. 11. Java Actions
  12. 12. Plain Old Function (POF) ● Pros ○ Java POJO ○ Simple and straightforward to understand ● Cons ○ Not portable across serverless providers ○ Dependencies need to bundled as an uberjar ○ Uses third-party libs e.g Google Gson for OpenWhisk Java Actions
  13. 13. Spring Cloud Functions (SCF) ● Pros ○ Uses standard and popular Spring Programming model ○ Standard Spring Boot Application Signature ■ No extension of specific provider e.g. AWS Lambda ○ Uses Java Function Model ■ Functions (Event Sinks) ● Suppliers ● Consumer ○ Adapters for major serverless providers OpenWhisk, AWS, Azure ■ Increases portability ● Cons ○ Heavy and Fat for serverless functional app ○ Startup time is longer owing to start the standard Spring Boot Application ○ Uses thin-jar for basic application and dependency resolution happens at runtime ○ Customization is not possible as some serverless providers might not allow custom docker images
  14. 14. WebAction ● Any action could be made web action ○ via annotation ● Web Action has URLS wsk -i action get myaction --url ● Any HTTP Verb could be used ● Automatic Content type detection via prefixing the url ○ E.g. https://some-url.json ● Can be invoked via URL ○ Query Parameters will be Action Parameter JSON ○ Request Body will be Action Parameter JSON ● If Content-Type header is ignored then the request body will be base64 encoded string ● It's NOT SYNCHRONOUS ● Some resources require authentication
  15. 15. Demo - Web Action
  16. 16. Action Chaining ● Actions can be chained ● Pre-defined chain of actions ○ Sequences ● Action Chaining could also be determined at runtime ○ Conductors ● Only first function in Sequence can accept parameter ○ The output of previous step(Action) is input to next
  17. 17. Demo - Action Chaining
  18. 18. Event Driven Capabilities ● OpenWhisk functions can respond to Events ● Events could be ○ Another function ○ External event source called as Feed Provider ● Event Action is OpenWhisk Function that’s invoked for a Trigger ● Event Actions are invoked via Triggers ○ Rules tie Actions to Triggers ● Trigger can be registered to Event Provider via Feeds (Stream of Events) ○ Feed can be: ■ Polling ■ Webhook ■ Persistent Connection
  19. 19. Cloud Events ● Define specification for Cloud Events ○ Effort via CNCF’s Serverless Working Group ● Major Cloud Providers, SaaS providers are part of working committee ● https://cloudevents.io/
  20. 20. Feed the Trigger to Rule your Action
  21. 21. Demo - Feeds and Events
  22. 22. Thank you bit.ly/faas-tutorial https://learn.openshift.com/serverless @kamesh_sampathkamesh.sampath@hotmail.com

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