Thomas Vitale DevCon Nov 9th, 2022 Kubernetes Native Java With Spring Boot @vitalethomas

Systematic • Software Architect at Systematic, Denmark. • Author of “Cloud Native Spring in Action” (Manning). • OSS contributor (Java, Spring, Cloud Native Technologies) Thomas Vitale thomasvitale.com @vitalethomas

Cloud Native @vitalethomas

Why Cloud Native? Speed Faster and fl exible delivery Cost Ef fi ciency and cost optimisation Scale Elasticity and dynamic scaling Resilience Availability and stability @vitalethomas

From Development to Production A Cloud Native Journey Spring Boot Development Cloud Native Buildpacks Containerization Kubernetes Deployment @vitalethomas

Cloud Native Development @vitalethomas

Cloud Native Development Development principles with Spring Boot • Self-contained application • Embedded server • No external dependencies • JAR packaging (“uber-JAR”) • Externalized con fi guration • Property fi les for default values • JVM system variables • Environment variables @vitalethomas

Packaging Spring Boot Standalone JAR JAR Gradle bootJar Maven spring-boot:repackage @vitalethomas

Containerization @vitalethomas

Image pack build Cloud Native Buildpacks From source code to container image @vitalethomas

Packaging Spring Boot JAR & Container Image JAR Container Image Gradle bootJar Maven spring-boot:repackage Gradle bootBuildImage Maven spring-boot:build-image @vitalethomas

Spring Boot on Kubernetes @vitalethomas

Knative Serverless experience on Kubernetes @vitalethomas

Serverless Architectures Developers focus on code Focus on business logic Developer Platform Infrastructure Provisioning Workload Management Dynamic Scaling @vitalethomas

Knative Serving Serverless Experience on Kubernetes Developer-friendly abstractions From image to URL Autoscaling Scaling to zero Progressive Rollouts Request-driven Event-driven Cloud agnostic @vitalethomas

Configuring Resources CPU & Memory CPU Memory When limit hit Throttle Compressible Resource When limit hit OOMKilled Non Compressible Resource @vitalethomas

Liveness and Readiness Probes Application ALIVE? READY? NO NO Restart might help. Restart won’t help. Don’t send any tra ffi c until it’s ready. @vitalethomas

Health Probes Liveness and readiness • Spring Boot • Use Spring Boot Actuator • Liveness and readiness health endpoints are automatically exposed when Kubernetes is detected. • Kubernetes • Con fi gure liveness probe • Con fi gure readiness probe @vitalethomas

Liveness and Readiness Probes When not available, Kubernetes will restart the container When not ready, Kubernetes will not send any tra ff i c to the container @vitalethomas

Externalised Configuration @vitalethomas

Code, Configuration, Credentials Code Con fi guration Deploy Credentials @vitalethomas

Configuration Options Spring Boot Properties ‣Property fi les ‣Command line arguments ‣Environment variables Con fi guration Services ‣Spring Cloud Con fi g Server ‣Spring Cloud Consul Con fi g ‣Spring Cloud Vault ‣Spring Cloud Zookeeper Con fi g Cloud Platform Services ‣Spring Cloud Alibaba ‣Spring Cloud AWS ‣Spring Cloud Azure ‣Spring Cloud GCP Kubernetes Platform ‣Con fi gMaps ‣Secrets ‣Environment variables @vitalethomas

ConfigMaps & Secrets Mount the volume to the /config path, where Spring Boot will automatically read property fi les. Load the Con fi gMap In a volume @vitalethomas

Graceful shutdown Spring Boot and Kubernetes • Spring Boot • Enable graceful shutdown • De fi ne a grace period • Kubernetes • Add pre-stop hook • De fi ne a grace period @vitalethomas

Native Images @vitalethomas

Spring Boot 3 Native executables with GraalVM Slower Heavier Build Instant Startup Reduced Memory Consumption Instant Peak Performance Fewer Runtime Optimizations @vitalethomas

Resources @vitalethomas

Resources Source code • Presentation source code • Developer experience with Java on Kubernetes • Docker fi les vs. Cloud Native Buildpacks • Knative and Spring: Bringing back the func @vitalethomas

https://github.com/ThomasVitale/awesome-spring

Discount codes Manning • 35% discount code, valid for all products in all format • ctwdevcon22 • manning.com @vitalethomas

Thomas Vitale DevCon Nov 9th, 2022 Kubernetes Native Java With Spring Boot @vitalethomas @thomasvitale@mastodon.online