Cloud Native with Spring Boot and Kubernetes (GOTO Aarhus 2021)

The Spring ecosystem provides you with all you need to build cloud native applications, focusing on productivity, simplicity and speed. It’s ready to leverage cloud environment features and integrates with Kubernetes natively. In this session, I’ll cover common patterns and best practices to build cloud native applications using Reactive Spring, which provides better performance, resilience, and efficiency. You’ll then see how to containerize them, configure them through the natively supported ConfigMaps and Secrets, and deploy them to a Kubernetes cluster. Finally, I’ll show how to use Spring Native to build GraalVM native executables.

Transcript

1. Thomas Vitale GOTO Aarhus Jun 10th, 2021 Cloud Native with Spring Boot and Kubernetes From development to production @vitalethomas
2. Thomas Vitale • Senior Software Engineer at Systematic, Denmark. • Spring, Cloud Native, DevOps, Kubernetes, Application Security. • Author of “Cloud Native Spring in Action” (Manning). About Me
3. Cloud Native thomasvitale.com @vitalethomas
4. Why Cloud Native? Speed Faster and fl exible delivery Cost Ef fi ciency and cost optimisation Scale Elasticity and dynamic scaling Resilience Availability and stability thomasvitale.com @vitalethomas
5. The Three P’s of Cloud Native Applications Properties Place Practices Private Cloud Public Cloud Hybrid Cloud Scalability Loose Coupling Resilience Manageability Observability Security Automation Continuous Delivery DevOps thomasvitale.com @vitalethomas
6. From Development to Production Cloud native journey in less than 45 minutes thomasvitale.com @vitalethomas Spring Boot Development Cloud Native Buildpacks Containerization Kubernetes Deployment
7. Cloud Native Development thomasvitale.com @vitalethomas
8. Cloud Native Development Development principles with Spring Boot • Self-contained application • Embedded server • No external dependencies • JAR packaging (“fat-JAR”) • Externalized con fi guration • Property fi les for default values • JVM system variables • Environment variables thomasvitale.com @vitalethomas
9. Containerization thomasvitale.com @vitalethomas
10. 1 Don’t use fat JARs 2 Optimize build/runtime performance 3 Don’t run as root or include secrets thomasvitale.com @vitalethomas
11. Containerize Spring Boot Applications Docker fi les Cloud Native Buildpacks Jib thomasvitale.com @vitalethomas
12. Spring Boot on Kubernetes thomasvitale.com @vitalethomas
13. Spring Boot on Kubernetes Kubernetes manifests for deploying applications • Deployment -> deploy the application (with replicas) • Service -> expose the application to the inside of the cluster • Ingress -> expose the application to the Internet thomasvitale.com @vitalethomas
14. Deploying Spring Boot Applications Computational resource con fi guration • Requests are the resources guaranteed to the application container. • Limits de fi ne the maximum resources an application container can get. • CPU is compressible. • When limit hit: throttle. • For JVM containers, no limit for startup boost. • Memory is non-compressible. • When limit hit: OOMKilled • For JMV containers, same value for requests and limits. thomasvitale.com @vitalethomas
15. Externalized Configuration thomasvitale.com @vitalethomas
16. Code, Configuration, Credentials Code Con fi guration Deploy Credentials thomasvitale.com @vitalethomas
17. ConfigMaps and Secrets Con fi guration and credentials • Con fi gMaps • Environment variables • Volume mounts • Secrets • Environment variables • Consider a backend like Vault for actual encryption or Sealed Secrets thomasvitale.com @vitalethomas
18. Graceful Shutdown thomasvitale.com @vitalethomas
19. Graceful shutdown Spring Boot and Kubernetes • Spring Boot • Enable graceful shutdown • De fi ne a grace period • Kubernetes • Add pre-stop hook • De fi ne a grace period thomasvitale.com @vitalethomas
20. Health Probes thomasvitale.com @vitalethomas
21. Liveness and Readiness Probes Application ALIVE? READY? NO NO Restart might help. Restart won’t help. Don’t send any tra ffi c until it’s ready. thomasvitale.com @vitalethomas
22. Health Probes Liveness and readiness • Spring Boot • Use Spring Boot Actuator • Liveness and readiness health endpoints are automatically exposed when Kubernetes is detected. • Kubernetes • Con fi gure liveness probe • Con fi gure readiness probe thomasvitale.com @vitalethomas
23. Spring Native thomasvitale.com @vitalethomas
24. Spring Native Native executables with GraalVM • Bene fi ts • Instant startup • Instant peak performance • Reduced memory consumption • Tradeo ff s • Slower and heavier build process • Fewer runtime optimizations thomasvitale.com @vitalethomas
25. Service discovery thomasvitale.com @vitalethomas
26. From Development to Production Cloud native journey in less than 45 minutes thomasvitale.com @vitalethomas Spring Boot Development Cloud Native Buildpacks Containerization Kubernetes Deployment
27. GitOps & Kubernetes thomasvitale.com @vitalethomas
28. GitOps - Cloud Native Operations https://www.weave.works/technologies/gitops/
29. GitOps - Configuration helm upgrade -i flux fluxcd/flux \ --set git.user=$GITHUB_USER \ --set git.email=$GITHUB_USER@users.noreply.github.com \ --set git.url=git@github.com:$GITHUB_USER/spring-boot- kubernetes-goto-2021 \ --set git.path="deployment" \ --set git.branch="main" \ --namespace flux thomasvitale.com @vitalethomas
30. With Spring Boot and Kubernetes • 35% discount code, valid for all products in all format • ctwgotoaar21 • manning.com Cloud Native Spring in Action www.thomasvitale.com @vitalethomas