Developer Experience with Java on Kubernetes

In the cloud-native world, being a developer might be challenging. The number of technologies and patterns to know can be overwhelming. This session presents an approach based on open-source technologies and focuses on improving the inner development loop and continuous delivery on Kubernetes. The end goal is to deliver value continuously, quickly, and reliably.

First, I’ll present several techniques for working locally effectively and productively. Should you run Kubernetes in your development environment? I’ll cover a few different options. Using Java, we’ll build a cloud-native application following the principles of test-driven development. The inner development loop will be enhanced with Cloud Native Buildpacks, Tilt, Knative, and Telepresence.

Continuous integration is a crucial practice for continuous delivery. We’ll check in code regularly, triggering an automated process to build, test, and package the application. Do you use pull requests? Relying on ArgoCD and the GitOps principles, I’ll show you how to work with temporary environments created dynamically when a new pull request is opened.

Finally, we'll use Cartographer to glue together all these different tools and design a golden path to production on Kubernetes, providing a clear separation of concerns and letting developers focus on delivering value.

Transcript

1. Thomas Vitale Devoxx UK May 10th, 2023 Developer Experience With Java on Kubernetes @vitalethomas
2. Systematic • Software Engineer and Cloud Architect. • Author of “Cloud Native Spring in Action” (Manning). • OSS contributor (Java, Spring, Cloud Native Technologies) Thomas Vitale thomasvitale.com @vitalethomas
4. Problem @vitalethomas
5. Value @vitalethomas
6. Delivering Value From idea to production Developer Production Idea @vitalethomas ?
7. Developer Experience @vitalethomas
8. Developer Experience “…developer experience could be defined as a means for capturing how developers think and feel about their activities within their working environments, with the assumption that an improvement of the developer experience has positive impacts on characteristics such as sustained team and project performance.” (F. Fagerholm, J. Münch) Developer Experience: Concept and De fi nition (F. Fagerholm, J. Münch) @vitalethomas
9. Developer Experience: Concept and De fi nition (F. Fagerholm, J. Münch) Developer Experience Conceptual Framework @vitalethomas
10. Value @vitalethomas
11. Developer Experience Tools are not enough ORGANIZATION PROCESSES TECHNOLOGY CULTURE @vitalethomas
12. Technologies Developer experience with Java on Kubernetes @vitalethomas
13. Team Topologies Organisational design for software @vitalethomas
14. Continuous Delivery Better software faster @vitalethomas
15. Goals 2 Reduced cognitive load 3 Clear and safe path to production 1 Rapid and continuous feedback loop @vitalethomas
16. Development Workflow @vitalethomas
17. Cloud Native @vitalethomas
18. From Traditional to Cloud Native Application Server, Embedded Server Runtime (JVM) Middleware (Application Server) Application (WAR/EAR) Runtime (JVM) Application (JAR) @vitalethomas
19. Containers @vitalethomas
20. Moving to Containers Application Server, Embedded Server, Container Runtime (OCI) Application (Container) Runtime (JVM) Middleware (Application Server) Application (WAR/EAR) Runtime (JVM) Application (JAR) @vitalethomas
21. Cloud Native Buildpacks @vitalethomas
22. Image pack build Cloud Native Buildpacks From source code to container image @vitalethomas
23. Kubernetes @vitalethomas
24. Moving to Kubernetes Application Server, Embedded Server, Container, Kubernetes Runtime (OCI) Middleware (Kubernetes) Application (Container) Runtime (JVM) Middleware (Application Server) Application (WAR/EAR) Runtime (JVM) Application (JAR) Runtime (OCI) Application (Container) @vitalethomas
25. Working with Kubernetes Manifests for application deployment Deployment Deploy the application and con fi gure replication Service Expose the application from within the cluster @vitalethomas Ingress Expose the application from outside the cluster
26. JKube @vitalethomas
27. Development on Kubernetes Spring Boot, Quarkus, Micronaut, Vert.x, OpenLiberty… Build k8sBuild Generate Manifests k8sResource @vitalethomas Apply Manifests k8sApply Watch k8sWatch
28. Tilt @vitalethomas
29. Tilt Continuous development on Kubernetes @vitalethomas CODE BUILD RUN TEST Inner Development Loop
30. Development Workflow Inner Loop and Outer Loop Inner Loop ‣Code ‣Build ‣Run ‣Test Outer Loop ‣CI/CD ‣Compliance, security ‣Con fi guration, monitoring ‣Production deployment git push @vitalethomas
31. Inner Development Loop Code, build, test E ffi cient Inner Development Loops for Cloud Native Applications https://www.getambassador.io/resources/inner-dev-loop/ @vitalethomas
32. Skaffold @vitalethomas
33. Skaffold Continuous development on Kubernetes @vitalethomas CODE BUILD RUN TEST Inner Development Loop
34. Argo CD @vitalethomas
35. Argo CD Continuous Deployment with GitOps @vitalethomas Developer App Repo Pull Request Sync changes Temporary Environment
36. Telepresence @vitalethomas
37. Telepresence Local-to-remote bridges for fast iterations @vitalethomas
38. Knative @vitalethomas
39. Knative Serverless experience on Kubernetes @vitalethomas
40. Serverless Architectures Developers focus on code Focus on business logic Developer Platform Infrastructure Provisioning Workload Management Dynamic Scaling @vitalethomas
41. Knative Serving Serverless Experience on Kubernetes Developer-friendly abstractions From image to URL Autoscaling Scaling to zero Progressive Rollouts Request-driven Event-driven Cloud agnostic @vitalethomas
42. Capabilities over responsibilities @vitalethomas
43. Developer @vitalethomas
44. Developer Platform @vitalethomas
45. Developer Platform @vitalethomas
46. Cartographer @vitalethomas
47. Kubernetes Native Choreographer Framework to build paved paths to production @vitalethomas
48. Delivering Value From code to production Developer Production Application Operator Security Expert Platform Engineer @vitalethomas
49. Workload API Developer-friendly interface @vitalethomas apiVersion: carto.run/v1alpha1 kind: Workload metadata: name: band-service labels: apps.kadras.io/workload-type: web spec: source: git: url: https://github.com/ThomasVitale/band-service ref: branch: main
50. Watch Source Code Testing Build Con fi guration Deployment @vitalethomas
51. Goals 2 Reduced cognitive load 3 Clear and safe path to production 1 Rapid and continuous feedback loop @vitalethomas
52. Resources @vitalethomas
53. Resources Source code • Presentation source code • Kadras: Cloud Native Platforms Toolkit • Cloud Native Buildpacks for ARM64 • Software Supply Chain Choreography • Cartographer • Cartographer CLI • Knative and Spring: Bringing back the func @vitalethomas
54. https://github.com/ThomasVitale/awesome-spring
55. Thomas Vitale Devoxx UK May 10th, 2023 Developer Experience With Java on Kubernetes @vitalethomas