Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 74“Production-grade backends”

Docker for Microservices

Each microservice ships as a Docker image.

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Focus

2 guided sections

Practice signal

Examples included

Career prep

Foundation builder

Introduction

Each microservice ships as a Docker image. Spring Boot 3 can build OCI images directly with Cloud Native Buildpacks — no Dockerfile needed.

Informative example

bash

# Build with buildpacks (no Dockerfile!)
./mvnw spring-boot:build-image -Dspring-boot.build-image.imageName=acme/orders:1.0.0

# Or a hand-rolled multi-stage Dockerfile
# ──────────────────────────────────────
FROM eclipse-temurin:21-jdk AS build
WORKDIR /app
COPY . .
RUN ./mvnw -q -DskipTests package

FROM eclipse-temurin:21-jre
WORKDIR /app
COPY --from=build /app/target/*.jar app.jar
EXPOSE 8080
USER 65532
ENTRYPOINT ["java","-jar","/app/app.jar"]

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