Multi-Stage 방식의 docker image layer cache을 통한 SpringBoot Application의 image 경량화

Dockerfile

# Dockerfile
FROM adoptopenjdk:11-jre-hotspot as builder
WORKDIR application
ARG JAR_FILE=build/libs/*.jar
COPY ${JAR_FILE} application.jar
RUN java -Djarmode=layertools -jar application.jar extract

FROM adoptopenjdk:11-jre-hotspot
WORKDIR application
COPY --from=builder application/dependencies/ ./
COPY --from=builder application/spring-boot-loader/ ./
COPY --from=builder application/snapshot-dependencies/ ./
COPY --from=builder application/application/ ./

ENTRYPOINT ["java", "org.springframework.boot.loader.JarLauncher"]

# Docker Image Build Command
- ECR Image Registry : docker build -f Dockerfile -t {IMAGE_REGISTRY_URI}:latest .
- Docker Hub Registry : docker build -f Dockerfile -t {DOCKER_HUB_ID}:latest .

# Docker Image Run Command
- docker run -d -p {external port}:{internal port} {IMAGE_REGISTRY_URI}:latest