如何减少没有高山的java应用程序的停靠图像大小？

Question

我在eclipse-temurin:11上构建了一个映像，它运行得很好，但是对于一个简单的spring-boot hello world webapp应用程序，它的结果是超过600 an。

问:我的文档是错的吗，或者我如何减少图像大小，而不需要打开高寒/麝香草？

# syntax=docker/dockerfile:1
FROM maven:3.8.4-eclipse-temurin-11 as build
WORKDIR application

COPY pom.xml .
RUN mvn dependency:go-offline

COPY src src
RUN mvn package

RUN cp /application/target/*.jar application.jar
RUN java -Djarmode=layertools -jar application.jar extract

FROM eclipse-temurin:11
WORKDIR application
COPY --from=build application/dependencies/ ./
COPY --from=build application/spring-boot-loader/ ./
COPY --from=build application/snapshot-dependencies/ ./
COPY --from=build application/application/ ./

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

也许有人看到了关于图像层大小的问题？

~$ docker history myimage:latest 
IMAGE          CREATED             CREATED BY                                      SIZE      COMMENT
e628830c54bf   About an hour ago   /bin/sh -c #(nop)  ENTRYPOINT ["java" "org.s…   0B        
87d052d04e27   About an hour ago   /bin/sh -c #(nop) COPY dir:5d09192487cc563d9…   13.8kB    
8c34a91b2cfb   About an hour ago   /bin/sh -c #(nop) COPY dir:8b993266a653e9e77…   0B        
d4e71b50b4da   About an hour ago   /bin/sh -c #(nop) COPY dir:8b86bf42f46c065b7…   252kB     
fbc788f64a4a   About an hour ago   /bin/sh -c #(nop) COPY dir:961713675a0647292…   26.4MB    
fa2564232f74   2 hours ago         /bin/sh -c #(nop) WORKDIR /application          0B        
3dbb3240fc1f   4 days ago          /bin/sh -c #(nop)  CMD ["jshell"]               0B        
<missing>      4 days ago          /bin/sh -c echo Verifying install ...     &&…   0B        
<missing>      4 days ago          /bin/sh -c #(nop)  ENV JAVA_HOME=/opt/java/o…   0B        
<missing>      4 days ago          /bin/sh -c set -eux;     ARCH="$(dpkg --prin…   322MB     
<missing>      4 days ago          /bin/sh -c #(nop)  ENV JAVA_VERSION=jdk-11.0…   0B        
<missing>      4 days ago          /bin/sh -c apt-get update     && DEBIAN_FRON…   43.2MB    
<missing>      4 days ago          /bin/sh -c #(nop)  ENV LANG=en_US.UTF-8 LANG…   0B        
<missing>      5 days ago          /bin/sh -c #(nop)  CMD ["bash"]                 0B        
<missing>      5 days ago          /bin/sh -c #(nop) ADD file:1d3b09cf9e041d608…   72.8MB    

问题似乎在于322 is层，其中完整的jdk被下载到容器中：

4 days ago /bin/sh -c set -eux; ARCH="$(dpkg --print-architecture)"; case "${ARCH}" in aarch64|arm64) ESUM='79572f5172c6a040591d34632f98a20ed148702bbce2f57649e8ac01c0d2e3db'; BINARY\_URL='https://github.com/adoptium/temurin11-binaries/releases/download/jdk-11.0.14.1%2B1/OpenJDK11U-jdk\_aarch64\_linux\_hotspot\_11.0.14.1\_1.tar.gz'; ;; armhf|arm) ESUM='f4d53a1753cdde830d7872c6a1279df441f3f9aeb5d5037a568b3a392ebce9c2'; BINARY\_URL='https://github.com/adoptium/temurin11-binaries/releases/download/jdk-11.0.14.1%2B1/OpenJDK11U-jdk\_arm\_linux\_hotspot\_11.0.14.1\_1.tar.gz'; ;; ppc64el|powerpc:common64) ESUM='9750e11721282a9afd18a07743f19c699b2b71ce20d02f3f0a906088b9ae6d9a'; BINARY\_URL='https://github.com/adoptium/temurin11-binaries/releases/download/jdk-11.0.14.1%2B1/OpenJDK11U-jdk\_ppc64le\_linux\_hotspot\_11.0.14.1\_1.tar.gz'; ;; s390x|s390:64-bit) ESUM='79a27a4dc23dff38a5c21e5ba9b7efcf0aa5e14ace1a3b19bec53e255c487521'; BINARY\_URL='https://github.com/adoptium/temurin11-binaries/releases/download/jdk-11.0.14.1%2B1/OpenJDK11U-jdk\_s390x\_linux\_hotspot\_11.0.14.1\_1.tar.gz'; ;; amd64|i386:x86-64) ESUM='43fb84f8063ad9bf6b6d694a67b8f64c8827552b920ec5ce794dfe5602edffe7'; BINARY\_URL='https://github.com/adoptium/temurin11-binaries/releases/download/jdk-11.0.14.1%2B1/OpenJDK11U-jdk\_x64\_linux\_hotspot\_11.0.14.1\_1.tar.gz'; ;; \*) echo "Unsupported arch: ${ARCH}"; exit 1; ;; esac; curl -LfsSo /tmp/openjdk.tar.gz ${BINARY\_URL}; echo "${ESUM} \*/tmp/openjdk.tar.gz" | sha256sum -c -; mkdir -p /opt/java/openjdk; cd /opt/java/openjdk; tar -xf /tmp/openjdk.tar.gz --strip-components=1; rm -rf /tmp/openjdk.tar.gz; 322MB

我如何在这里减少java层？

Answer 1

一个简单的解决方案可以是使用11-jre映像用于运行时(eclipse-temurin:11-jre)。这将节省大约100 MB。其他一切似乎都与您的应用程序相关(考虑到11映像的大小约为220 MB )。