Boston JUG - From 0 to Production-Grade with Kubernetes-Native Java

Transcript

1. Kubernetes: From 0 to Production-Grade with Java Kevin Dubois Senior Principal Developer Advocate Red Hat @kevindubois.com
2. Kevin Dubois ★ Sr. Principal Developer Advocate at Red Hat ★ Java Champion ★ From Belgium 󰎐 ★ Professional Software Engineer for ~20 years ★ Working with Java and Cloud Native for ~10 years ★ 🗣 Speak English, Dutch, French, Italian youtube.com/@thekevindubois linkedin.com/in/kevindubois github.com/kdubois @kevindubois.com
3. “Kube Native” Java !?
4. overprovisioned & wasting resources underprovisioned & unhappy users! Traditional Deployments
5. Cloud Computing Use only what you need! with Serverless
6. When you can’t scale fast enough…
7. JVM Scaling increase of load triggers scale up event of pods
8. “Traditional” Java • Throughput at the expense of footprint • Long running at expense of startup speed • Rich, dynamic behaviour for mutable systems “Kube Native” Java • Throughput solved by scaling • Footprint and startup speed matter • Ephemeral, immutable systems
9. CRaC
10. 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
11. From 0 … To “Production-Grade”
12. 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
13. Architecture 3: Generate power (REST) Game 4: Send power event
16. apiVersion: v1 kind: Service metadata: name: kubenative spec: ports: - name: http port: 80 protocol: TCP targetPort: 8080 selector: app.kubernetes.io/name : kubenative apiVersion: apps/v1 kind: Deployment metadata: name: kubenative spec: replicas: 1 selector: matchLabels: app.kubernetes.io/name : kubenative template: spec: containers: - image: quay.io/kevindubois/demo name: kubenative ports: - containerPort: 8080 name: http protocol: TCP
17. @kevindubois.com mvn package
18. github.com/kdubois/quarkus-kubernetes-kafka-db
19. @kevindubois
20. Container Running Sends traffic App not ready Ready??
21. After 2.6s (Kafka, DB, Caching) App is ready to receive traffic Container Running Sends traffic App not ready Ready??
22. Downtime of 2.6s Ready??
23. readinessProbe: failureThreshold: 3 httpGet: path: /q/health/ready port: 8080 scheme: HTTP initialDelaySeconds: 5 livenessProbe: failureThreshold: 3 httpGet: path: /q/health/live port: 8080 scheme: HTTP initialDelaySeconds: 5 Ready!
24. https://microprofile.io/
25. containers: - name: nginx-container image: nginx:latest ports: - containerPort: 80 volumes: - name: secret-volume secret: secretName: your-secret-name Kubernetes Secrets & ConfigMaps
26. resources: requests: memory: "300Mi" cpu: "250m" # 1/4 core limits: memory: "400Mi" cpu: "1000m" # 1 core Resource Limits
27. CPU Request More CPU Limit State your intentions
28. Memory Request More Memory Limit Burstable
29. Memory Request Limit Guaranteed
30. 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
31. 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 )
32. @kevindubois @alexsotob Observability & Fault Tolerance
33. Ready for Production!
34. Push to give energy windmill Kafka Topic 2.Sends the interaction Dashboard: Green Energy Nickname Team SHAKE! to generate energy Cars that need energy Two teams competing (top 5 players) First team wins @kevindubois @alexsotob
35. V1 Scan the QR Code with your phone to play
36. 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?
37. Pull Request Source Git Repository Image Registry Config Git Repository Kubernetes Deploy Monitor Detect drift CD Take action GitOps Application Delivery Model
38. V2 Scan the QR Code with your phone to play
39. github.com/kdubois/quarkus-kubernetes-kafka-db github.com/kdubois/quarkus-observability github.com/redhat-developer-demos/quinoa-wind-turbine
40. Free Developer e-Books & Tutorials! developers.redhat.com/eventtutorials
41. 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.
42. youtube.com/@thekevindubois linkedin.com/in/kevindubois github.com/kdubois @kevindubois slides Thank you!