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Knative and Spring - Bringing back the func.pdf
Mauricio Salatino and Thomas Vitale presented on using Knative and Spring to build serverless applications with functions. They demonstrated how to deploy functions from code to a URL using Knative Serving and Functions. They also discussed using Knative Eventing to build event-driven architectures and route events between functions. Finally, they proposed a game architecture using functions and events on Kubernetes and discussed challenges around scaling, latency, and consistency.
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Knative and Spring - Bringing back the func.pdf
- 1. Mauricio Salatino &Thomas Vitale Devoxx UK May 11th, 2022 Knative and Spring Bringing back the func @salaboy @vitalethomas
- 2. Mauricio Salatino VMware -Knative OSS * a.k.a @Salaboy * Sta ff Engineer - Knative Eventing tech lead for VMware * Knative OSS core contributor * Passionate about Functions, Platforms, Open Source and Kubernetes salaboy.com
- 3. Systematic * Software Architectat Systematic, Denmark. * Author of “Cloud Native Spring in Action” (Manning). * Spring Security and Spring Cloud contributor. Thomas Vitale thomasvitale.com @vitalethomas
- 4. Quiz Game thomasvitale.com @vitalethomas @salaboy@vitalethomas Building applications using functions
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- 6. Serverless Architectures Developers focuson code Focus on business logic @salaboy @vitalethomas Developer Platform Infrastructure Provisioning Workload Management Dynamic Scaling
- 7. Knative Serving Serverless Containerson Kubernetes Developer-friendly abstractions From code to URL Autoscaling Scaling to zero Progressive Rollouts Request-driven Event-driven @salaboy @vitalethomas Cloud agnostic
- 8. Demo thomasvitale.com @vitalethomas @salaboy @vitalethomas KnativeServing - From code to URL
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- 10. Functions Functional programming model Triggeredby requests or events Stateless Smaller scope Cold start Cost optimization @salaboy @vitalethomas
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- 13. Functions Patterns Synchronous Interactions Function HTTP Request/ Response (Sync) State
- 14. Functions Patterns Synchronous Interactions Function HTTP Request/ Response (Scaling) State Function Function Load Balancer
- 15. Functions Patterns Synchronous Interactions HTTP Request/ Response (Scaling) State Load Balancer Not running useless containers
- 16. Functions Patterns Asynchronous Interactions AsyncProcessing Function HTTP Doing something that takes a long time …………………………………………… ………………………………………………… …………………………………………………… ……………………………………………… ……………………………………… Results
- 17. Functions Patterns Asynchronous Interactions EventBased Function CloudEvent CloudEvent
- 18. Functions Patterns Asynchronous Interactions ChainingFunctions Function CloudEvent Event Router Function Function
- 19. Functions Patterns Mix andmatch Function Request / Reply + Events CloudEvent HTTP Event Router
- 20. Knative Functions Working withthe func CLI @salaboy @vitalethomas func create ‣Initialize project ‣Polyglot support ‣Java, Go, Python 1 func build ‣Build and containerize ‣Use Buildpacks ‣No Docker fi le 2 func deploy ‣Run on Kubernetes ‣Knative deployment ‣No YAML 3
- 21. Demo thomasvitale.com @vitalethomas @salaboy @vitalethomas KnativeFunctions - From code to URL (GO)
- 22. Func - extras Inactive development, join the community! * External template repos * func run * On-cluster build, no Docker locally * 1.0 GA is on the roadmap
- 23. Functions with Spring @salaboy@vitalethomas
- 24. Spring Native Native executableswith GraalVM Slower Heavier Build Instant Startup Reduced Memory Consumption Instant Peak Performance Fewer Runtime Optimizations @salaboy @vitalethomas
- 25. Functional Programming Paradigm Java8 Functional Interfaces Supplier<O> Function<I,O> Consumer<I> @salaboy @vitalethomas
- 26. Spring Cloud Function Businesslogic as functions Transparent Type Conversion Function Arity Function Composition Reactive Support JAR Functions @salaboy @vitalethomas
- 27. Demo thomasvitale.com @vitalethomas @salaboy @vitalethomas KnativeFunctions - From code to URL (Spring)
- 28. Function Composition Data processingvia functions uppercase() sentence() Data processing “I play the PIANO” “piano” “PIANO”
- 29. Spring Cloud Function Deploymentand integrations Knative CloudEvents RSocket Azure Functions Google Cloud Functions AWS Lambda @salaboy @vitalethomas
- 30. Game - Architecture @salaboy@vitalethomas
- 31. Kubernetes Cluster Function-based Gamearchitecture Game architecture <Client Side> React Application <Orchestrator> Game FrontEnd <Function> Start Game <Function> Level X … <Function> Get LeaderB Redis (State) HTTP SYNC <Function> Level 1 …
- 32. Takeaways and challenges Synchronousfunctions Functions scale up and down based on demand An Orchestrator is needed Synchronising state is hard Make sure that the data store is not a bottleneck Latency can become an issue @salaboy @vitalethomas
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- 34. Knative Eventing Event routingand triggers Developer-friendly abstractions Event-driven architectures Event routing Polyglot support with CloudEvents Pluggable @salaboy @vitalethomas Cloud agnostic
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- 36. Game - Events @salaboy@vitalethomas
- 37. Routing Events withKnative Eventing CloudEvents & RSocket Kubernetes Cluster <Client Side> React Application <Orchestrator> Game FrontEnd <Function> Level X … Redis HTTP SYNC Broker Trigger Score CloudEvent RSocket GameScore CloudEvent Trigger Another Function
- 38. Takeaways and challenges Eventing Anevent-based approach enable more reactive scenarios Knative Eventing abstracts the message broker implementations CloudEvents provide a standard structure for sharing data Monitoring is required to understand how data is fl owing We need to deal with eventual consistency in our applications @salaboy @vitalethomas
- 39. Discount codes Manning • 35%discount code, valid for all products in all format • ctwdevoxxuk22 • manning.com
- 40. Resources Source code • Learnmore about the game: • https://github.com/salaboy/from-monolith-to-k8s/tree/main/game • Deploy the game on Kubernetes: • https://github.com/ThomasVitale/eventing-game • Spring Cloud Function samples: • https://github.com/ThomasVitale/devoxxuk-2022-knative-spring-func
- 41. Mauricio Salatino &Thomas Vitale Devoxx UK May 11th, 2022 Knative and Spring Bringing back the func @salaboy @vitalethomas