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Kubernetes: From 0 to Production-Grade with Java Kevin Dubois Senior Principal Developer Advocate Red Hat

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“Kube Native” Java !?

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“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 ● Ephemeral, immutable systems ● Footprint and startup speed matter

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JVM Scaling increase of load triggers scale up event of pods

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When you can’t scale fast enough…

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CRaC

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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

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Let’s start to build our app!

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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

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Architecture 3: Generate power (REST) Game 4: Send power event

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No content

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@kevindubois

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Container Running Sends traffic App not ready Ready??

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After 2.6s (Kafka, DB, Caching) App is ready to receive traffic Container Running Sends traffic App not ready Ready??

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Downtime of 2.6s Ready??

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https://microprofile.io/

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readinessProbe: httpGet: path: /health port: 8080 initialDelaySeconds: 10 periodSeconds: 3 Ready!

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resources: requests: memory: "300Mi" cpu: "250m" # 1/4 core limits: memory: "400Mi" cpu: "1000m" # 1 core Resource Limits

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CPU Request More CPU Limit State your intentions

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Memory Request More Memory Limit Burstable

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Memory Request Limit Guaranteed

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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

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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 )

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containers: - name: nginx-container image: nginx:latest ports: - containerPort: 80 volumes: - name: secret-volume secret: secretName: your-secret-name Kubernetes Secrets & ConfigMaps

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@kevindubois @alexsotob Observability & Fault Tolerance

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Ready for Production!

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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

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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

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Shaking Time :)

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V2 Scan the QR Code with your phone to play

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github.com/kdubois/quarkus-kubernetes-kafka-db github.com/kdubois/quarkus-observability github.com/redhat-developer-demos/quinoa-wind-turbine

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Free Developer e-Books & Tutorials! developers.redhat.com/eventtutorials

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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.

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youtube.com/@thekevindubois linkedin.com/in/kevindubois github.com/kdubois @kevindubois slides