Brazil Quarkus Club - From 0 to Production-Grade with Kubernetes Native Quarkus

I hear you thinking, “is this yet another session about doing cloud native development?”. Well.. yes, sort of, but we promise it’s going to be a good one - or so we think :). In this session we’re going to talk (and demo!) about what it means to be a good Cloud Citizen - which is more than merely putting an application in a container and deploying it. To optimize your Java application's performance and resilience in the cloud, it is essential to consider factors such as providing real-time health status through fine-grained metrics. You’ll also need to ensure fast startup, and avoid excessive resource consumption within the cluster. Being a good Cloud Citizen also involves streamlining configuration, deployment and upgrade processes. By integrating these tasks seamlessly, the application can facilitate smooth deployments and upgrades, which will lead to more efficiency and ease of management. Join us in this session and embark on a journey to develop a perfect(ish) Cloud Native Java App

Recording: https://www.youtube.com/live/5fk2QNkFAnE?si=pOul0M4qhBIZ0S6I

Transcript

1. @kevindubois From 0 to Production with Kubernetes Native Quarkus Kevin Dubois Principal Developer Advocate, Red Hat @kevindubois
2. @kevindubois Kevin Dubois 🤘 Principal Developer Advocate at Red Hat 🤘 Java Champion 🤘 Based in Belgium 󰎐 🤘 Speak English, Dutch, French, Italian 🤘 Open Source Contributor (Quarkus, Camel, Knative, ..) 🤘 Open Source Community Member (Belgian JUG, Belgian CNCF chapter) @kevindubois@mastodon.social youtube.com/@thekevindubois github.com/kdubois
3. @kevindubois “Kube Native” Java !?
4. @kevindubois “Traditional” • Throughput at the expense of footprint • Long running at expense of startup speed • Rich, dynamic behaviour for mutable systems Kube Native • Throughput solved by scaling • Ephemeral, immutable systems • Footprint and startup speed matter
5. @kevindubois JVM Scaling * Graph is loosely based on actual lab results at Red Hat
6. @kevindubois When you can’t scale fast enough…
7. @kevindubois Quarkus + Native (via GraalVM) 12 MB Quarkus + JVM (via OpenJDK) 73 MB Traditional Cloud-Native Stack 136 MB Quarkus + Native (via GraalVM) 0.016 Seconds Quarkus + JVM (via OpenJDK) 0.943 Seconds Traditional Cloud-Native Stack 4.3 Seconds Supersonic. Subatomic. Java
8. @kevindubois Build Time Runtime Packaging (maven, etc) Load config file from file system Parse it Classpath scanning to find annotated classes Attempt to load class to enable/disable features Build its model of the world. Start the management (thread, pool…) @ @ </> How Does “Traditional Java” Start?
9. @kevindubois The Quarkus Way JVM Build Time @ @ </> Package model Native
10. @kevindubois Enough slides for now… let’s start building our App!
11. @kevindubois
12. @kevindubois @kevindubois
13. @kevindubois Container Running Sends traffic App not ready Ready??
14. @kevindubois After 2.6s (Kafka, DB, Caching) App is ready to receive traffic Container Running Sends traffic App not ready Ready??
15. @kevindubois Downtime of 2.6s Ready??
16. @kevindubois https://microprofile.io/
17. @kevindubois readinessProbe: httpGet: path: /health port: 8080 initialDelaySeconds: 10 periodSeconds: 3 Ready!
18. @kevindubois containers: - name: nginx-container image: nginx:latest ports: - containerPort: 80 volumes: - name: secret-volume secret: secretName: your-secret-name Kubernetes Secrets
19. @kevindubois resources: requests: memory: "300Mi" cpu: "250m" # 1/4 core limits: memory: "400Mi" cpu: "1000m" # 1 core Resource Limits
20. @kevindubois CPU Request More CPU Limit State your intentions
21. @kevindubois Memory Request More Memory Limit Burstable
22. @kevindubois Kubernetes Memory Request Limit Guaranteed
23. @kevindubois https://learn.microsoft.com/en-us/azure/developer/java/containers/overview vCPU cores Memory Heap Size GC Replicas 2 4Gb 75% Parallel 2 Some sensible starting numbers
24. @kevindubois https://learn.microsoft.com/en-us/azure/developer/java/containers/overview resources: requests: memory: "4000Mi" cpu: "2000m" limits: memory: "4000Mi" cpu: "2000m" - env: - name: JDK_JAVA_OPTIONS value: "-XX:+UseParallelGC -XX:MaxRAMPercentage=75" Sensible Initial VAlues ( JVM )
25. @kevindubois @kevindubois @alexsotob Observability
26. @kevindubois spec: affinity: podAffinity: requiredDuringSchedulingIgnoredDuringExecution: - labelSelector: matchExpressions: - key: "app" operator: In values: - my-app topologyKey: "kubernetes.io/hostname" containers: Pod Affinity = lower latency
27. @kevindubois Ready for Production!
28. @kevindubois Push to give energy windmill Kafka Topic 2.Sends the interaction Dashboard: Green Energy Nickname Team Push/Tap to generate energy Cars that need energy Two teams competing (top 5 players) First team wins @kevindubois @alexsotob
29. @kevindubois Architecture 3: Generate power (REST) Game Dashboard 1: Assign player Name & Team (REST) 6: Update dashboard (SSE) 2: Increment player cluster counter 4: Send power event 5: Receive power events
30. @kevindubois YOU PLAY! Scan the QR Code with your phone to play
31. @kevindubois
32. @kevindubois
33. @kevindubois
34. @kevindubois
35. @kevindubois
36. @kevindubois
37. @kevindubois @kevindubois @alexsotob What is GitOps?
38. @kevindubois Treat everything as code Git Commands Infrastructure as Code Operations through Git workflows Git Repository Git is the single source of truth @kevindubois @alexsotob What is GitOps?
39. @kevindubois Pull Request Source Git Repository Image Registry Config Git Repository Kubernetes Deploy Monitor Detect drift CD Take action GitOps Application Delivery Model
40. @kevindubois Shaking Time :)
41. @kevindubois V2 Scan the QR Code with your phone to play
42. @kevindubois https://github.com/kdubois/quarkus-kubernetes-kafka-db https://github.com/redhat-developer-demos/quinoa-wind-turbine
43. @kevindubois Free Developer e-Books & Tutorials! developers.redhat.com/eventtutorials
44. @kevindubois Start exploring in the OpenShift Sandbox. Learn containers, Kubernetes, and OpenShift in your browser. developers.redhat.com/developer-sandbox Try Red Hat's products and technologies without setup or configuration.
45. @kevindubois muito obrigado! @thekevindubois kdubois @kevindubois