Spring Boot Tutorial 0/110 lessons ~6 min read Lesson 78“Production-grade backends”

Dockerizing Spring Boot Apps

Three good ways to containerise Spring Boot, in order of preference: buildpacks, Jib, hand-written Dockerfile.

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Focus

3 guided sections

Practice signal

Examples included

Career prep

Foundation builder

Introduction

Three good ways to containerise Spring Boot, in order of preference: buildpacks, Jib, hand-written Dockerfile.

Syntax reference

2. Layered Dockerfile (full control):

bash

FROM eclipse-temurin:21-jre AS layers
WORKDIR /app
COPY target/*.jar app.jar
RUN java -Djarmode=layertools -jar app.jar extract

FROM eclipse-temurin:21-jre
WORKDIR /app
COPY --from=layers /app/dependencies/    ./
COPY --from=layers /app/spring-boot-loader/ ./
COPY --from=layers /app/snapshot-dependencies/ ./
COPY --from=layers /app/application/      ./
USER 65532
ENTRYPOINT ["java","org.springframework.boot.loader.launch.JarLauncher"]

Informative example

1. Buildpacks (recommended):

bash

./mvnw spring-boot:build-image \
  -Dspring-boot.build-image.imageName=acme/orders:1.0.0 \
  -Dspring-boot.build-image.builder=paketobuildpacks/builder-jammy-base

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