Cloud Native Spring - Migrating Traditional Applications

The Spring ecosystem provides you with all you need to build cloud native applications, focusing on productivity, simplicity, and speed. If you decided that moving to the cloud will help your business, you’d need a strategy to migrate your existing applications. Luckily, Spring got you covered.

In this session, I’ll cover the main technical steps of migrating a traditional Spring application to be cloud native. You’ll learn best practices and common patterns to build self-contained apps by using embedded servers and packaging them as Docker images, use externalized configuration for immutable artifacts, and make the apps observable with logs, metrics, and traces. Drawing from real examples, you’ll have a roadmap to follow in your journey to the cloud with Spring Boot and Spring Cloud.

Transcript

1. Thomas Vitale @vitalethomas thomasvitale.com Cloud Native Spring Migrating traditional applications Devoxx Ukraine 2020
2. Thomas Vitale • Senior Software Engineer at Systematic, Denmark. • Spring, Cloud Native, DevOps, Application Security. • Author of “Cloud Native Spring in Action - With Spring Boot and Kubernetes” (Manning). About Me
3. Agenda • 5 essential migration steps • Application server • Containerization • Configuration • Application lifecycle • Logging and monitoring #DevoxxUA @vitalethomas
4. 1. Application Server #DevoxxUA @vitalethomas
5. Application Server - Traditional WAR/EAR artifacts deployed to an application server #DevoxxUA @vitalethomas A lica i Se e (T ca , W d , J ) A 1 (WAR) A 2 (WAR) A 3 (WAR) A 4 (WAR)
6. #DevoxxUA @vitalethomas Application Server - Cloud Native Embedded Server Blocking + Servlet API (Tomcat, Undertow, Jetty) Spring Web Embedded Server Non-Blocking + Project Reactor (Netty) Spring WebFlux Serverless Functions (AWS Lambda, Azure Functions, GCP Functions) Spring Cloud Functions
7. Application Server - Cloud Native Executable JAR artifacts with embedded server #DevoxxUA @vitalethomas A 1 ( A ) A 2 ( A ) A 3 ( A ) A 4 ( A )
8. Demo Embedded Server + JAR #DevoxxUA @vitalethomas https://github.com/ThomasVitale/devoxx-ua-2020
9. 2. Containerization #DevoxxUA @vitalethomas
10. Containerization Packaging Spring Boot apps as Docker images #DevoxxUA @vitalethomas Dockerfiles Cloud Native Buildpacks Jib
11. Working with Docker Images Don’t use fat JARs Leverage layered JARs Security Don’t run as root or include secrets Performance Optimize build and runtime performance Maintenance Use up-to-date libraries #DevoxxUA @vitalethomas
12. Demo Containerizing Spring Boot #DevoxxUA @vitalethomas https://github.com/ThomasVitale/devoxx-ua-2020
13. 3. Configuration #DevoxxUA @vitalethomas
14. Code and Configuration #DevoxxUA @vitalethomas Code Configuration Deploy
15. Configuration - Traditional Configuration files and environment variables #DevoxxUA @vitalethomas Property files Environment variables XML files
16. Configuration - Cloud Native #DevoxxUA @vitalethomas Spring Boot Properties Property files Command line arguments Environment variables Configuration Services Spring Cloud Config Server Spring Cloud Consul Config Spring Cloud Vault Spring Cloud Zookeeper Config Cloud Platform Services Spring Cloud Alibaba Spring Cloud AWS Spring Cloud Azure Spring Cloud GCP Kubernetes Platform ConfigMaps Secrets Environment Variables
17. Server Configuration #DevoxxUA @vitalethomas Spring Boot Autoconfiguration Properties WebServerFactoryCustomizer
18. Demo Configuration Strategies #DevoxxUA @vitalethomas https://github.com/ThomasVitale/devoxx-ua-2020
19. 4. Application Lifecycle #DevoxxUA @vitalethomas
20. Application Lifecycle - Traditional #DevoxxUA @vitalethomas Vertical scaling Extra care for each instance Slow startup time
21. Application Lifecycle - Cloud Native Disposable and stateless applications #DevoxxUA @vitalethomas Horizontal scaling Disposable instances Fast startup time
22. Demo Disposability and scalability #DevoxxUA @vitalethomas https://github.com/ThomasVitale/devoxx-ua-2020
23. 5. Logging & Monitoring #DevoxxUA @vitalethomas
24. Logs - Now and Then From log files to event streams #DevoxxUA @vitalethomas Log to files File naming File sizing File rotation Log to stdout Event stream External log collection External log aggregation
25. Health Checks Liveness and readiness probes Application #DevoxxUA @vitalethomas ALIVE? READY? NO NO Restart might help Restart won’t help
26. Metrics - Now and Then Towards observable applications #DevoxxUA @vitalethomas External agents Outside the application Internal agents The application exposes metrics
27. Demo Logging and Monitoring #DevoxxUA @vitalethomas https://github.com/ThomasVitale/devoxx-ua-2020
28. What’s next? #DevoxxUA @vitalethomas
29. II. Dependency management I. One codebase, one application III. Configuration, credentials, and code V. Design, build, release, run IV. Backing services VI. Stateless processes VIII. Concurrency VII. Port binding IX. Disposability XI. Logs X. Environment parity XII. Administrative processes XIV. Telemetry XIII. API first XV. Authentication and authorization
30. What’s next? #DevoxxUA @vitalethomas Resilience Resilience4J Spring Cloud Circuit Breaker Distributed systems Spring Cloud Gateway Spring Cloud Stream Spring Security OAuth Reactive Spring WebFlux R2DBC Project Reactor Kubernetes Spring Boot Spring Cloud Kubernetes Skaffold
31. With Spring Boot and Kubernetes • 35% discount code, valid for all products in all format • ctwdevoxxukr20 • manning.com • 5 free e-book codes • join Q&A for the raffle Cloud Native Spring in Action
32. Bonus Demo Spring Boot on Kubernetes #DevoxxUA @vitalethomas https://github.com/ThomasVitale/devoxx-ua-2020
33. Thomas Vitale @vitalethomas thomasvitale.com Cloud Native Spring Migrating traditional applications Devoxx Ukraine 2020