SingaDev - Kubernetes. From 0 to Production with Java

Transcript

1. @kevindubois Kubernetes. From 0 to Production-grade with Java Kevin Dubois Principal Developer Advocate, Red Hat @kevindubois
2. @kevindubois Kevin Dubois 🤘 Principal Developer Advocate at Red Hat 🤘 International Speaker 🤘 18+ years professional software development experience 🤘 Speak English, Dutch, French, Italian 🤘 Open Source Contributor (Quarkus, Camel, Knative, ..) 🤘 Open Source Community Member (Belgian JUG, Belgian CNCF chapter) 🤘 and … a Quarkus Fan(boy) :) @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 Kubernetes After 2.6s (Kafka, DB, Caching) App is ready to receive traffic Container Running Sends traffic App not ready Ready??
15. @kevindubois Kubernetes 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 ) “Captain Sensible” 󰤇
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 @kevindubois @alexsotob
30. @kevindubois YOU PLAY! Scan the QR Code with your phone to play
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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 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.
43. @kevindubois Free Developer e-Books! https://developers.redhat.com/eventtutorials
44. @kevindubois Thank you! @thekevindubois kdubois @kevindubois