Kubernetes. From 0 to Production-Grade with Java @ Dublin JUG

@kevindubois Kubernetes. From 0 to Production-grade with Java Kevin Dubois
Principal Developer Advocate, Red Hat @kevindubois

@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) :) @[email protected] youtube.com/@thekevindubois github.com/kdubois

@kevindubois “Kube Native” Java !?

@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

@kevindubois JVM Scaling * Graph is loosely based on actual
lab results at Red Hat

@kevindubois When you can’t scale fast enough…

@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

@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?

@kevindubois The Quarkus Way JVM Build Time @ @ </>
Package model Native

@kevindubois Enough slides for now… let’s start building our App!

@kevindubois

@kevindubois @kevindubois

@kevindubois Container Running Sends traffic App not ready Ready??

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

@kevindubois Kubernetes Downtime of 2.6s Ready??

@kevindubois https://microprofile.io/

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

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

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

@kevindubois CPU Request More CPU Limit State your intentions

@kevindubois Memory Request More Memory Limit Burstable

@kevindubois Kubernetes Memory Request Limit Guaranteed

@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

@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” 󰤇

@kevindubois @kevindubois @alexsotob Observability

@kevindubois Kubernetes spec: affinity: podAffinity: requiredDuringSchedulingIgnoredDuringExecution: - labelSelector: matchExpressions: -
key: "app" operator: In values: - my-app topologyKey: "kubernetes.io/hostname" containers: Pod Affinity = lower latency

@kevindubois Ready for Production!

@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

@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

@kevindubois YOU PLAY! Scan the QR Code with your phone
to play

@kevindubois

@kevindubois @kevindubois @alexsotob What is GitOps?

@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?

@kevindubois Pull Request Source Git Repository Image Registry Config Git
Repository Kubernetes Deploy Monitor Detect drift CD Take action GitOps Application Delivery Model

@kevindubois Shaking Time :)

@kevindubois V2 Scan the QR Code with your phone to
play

@kevindubois Free Developer e-Books! https://developers.redhat.com/eventtutorials

@kevindubois Thank you! @thekevindubois kdubois @kevindubois

Kubernetes. From 0 to Production-Grade with Jav...

Kubernetes. From 0 to Production-Grade with Java @ Dublin JUG

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