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Thomas Vitale SpringOne Sep 1st, 2021 Spring Boot: Production Boost Boost your journey to production @vitalethomas

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Thomas Vitale • Senior Software Engineer at Systematic, Denmark. • Spring, Cloud Native, DevOps, Kubernetes, Application Security. • Author of “Cloud Native Spring in Action” (Manning). About Me thomasvitale.com

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thomasvitale.com @vitalethomas thomasvitale.com @vitalethomas JVM & Containers Data Integration Monitoring & Management Testing Con fi guration

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Self-contained applications thomasvitale.com @vitalethomas JVM & Containers

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

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Configuring Resources for JVM Containers CPU & Memory thomasvitale.com @vitalethomas CPU Memory When limit hit Throttle Compressible Resource When limit hit OOMKilled Non Compressible Resource

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Database version control thomasvitale.com @vitalethomas Data Integration

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Data Integration thomasvitale.com @vitalethomas Spring Data for Relational Databases Spring Data JPA ‣JPA & Hibernate ‣Repositories ‣JDBC Spring Data JDBC ‣DDD Principles ‣Repositories ‣JDBC Spring Data R2DBC ‣DDD Principles ‣Repositories ‣R2DBC Data Integration

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Schema and data management Flyway: Version control for your database thomasvitale.com @vitalethomas SQL Migrations Schema changes Java Migrations Data changes V1 Init schema V2 Add column V3 Create table V4 Add constraint time Data Integration

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Externalized configuration thomasvitale.com @vitalethomas Con fi guration

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Configuration Options thomasvitale.com @vitalethomas 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 Con fi guration

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Configuration Strategies thomasvitale.com @vitalethomas Con fi guration Properties Property fi les ‣Default values ‣Development environment values Con fi guration Service Spring Cloud Con fi g ‣Connection pools ‣Timeouts and retries ‣Feature fl ags ‣External Services (URLs & Passwords) Kubernetes Platform Con fi gMaps & Secrets ‣Spring Active Pro fi les ‣Internal Services (URLs & Passwords) Con fi guration

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

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Environment Parity thomasvitale.com @vitalethomas Testing

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Testing Spring Boot thomasvitale.com @vitalethomas Types of auto tests for Spring Boot applications Unit Tests ‣JUnit ‣Mockito ‣No Spring context Integration Tests ‣@SpringBootTest ‣Web server ‣Full Spring context Slice Tests ‣@SpringWebMvc ‣@SpringDataR2dbc ‣Sliced Spring context Testing

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Testcontainers thomasvitale.com @vitalethomas Testing with external dependencies Docker containers Run external dependencies as Docker containers Data Layer Tests Ensure environment parity by testing the data layer with the real database Integration Tests Use containers for databases, message queues, and web servers Testing

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Observable applications thomasvitale.com @vitalethomas Monitoring & Management

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Monitoring and management thomasvitale.com @vitalethomas Operating applications in production Spring Boot Actuator ‣Health (liveness and readiness) ‣Metrics (Prometheus, OpenMetrics) ‣Flyway, Thread Dumps, Heap Dumps Spring Cloud Sleuth ‣Distributed tracing ‣Instrumentation ‣OpenZipkin and OpenTelemetry Monitoring & Management

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

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thomasvitale.com @vitalethomas thomasvitale.com @vitalethomas JVM & Containers Data Integration Monitoring & Management Testing Con fi guration

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Thomas Vitale SpringOne Sep 1st, 2021 Spring Boot: Production Boost Boost your journey to production @vitalethomas