java打包成docker images

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本文详细指导如何使用Dockerfile创建一个基于openjdk:8-alpine的jar包应用镜像，包括Dockerfile编写、标签设置、体积优化和注意事项，适合初学者理解Alpine的使用和Java应用部署。

一个最简单的jar包的Dockerfile制作

openjdk的dockerhub地址

在代码根目录创建Dockerfile文件，内容如下

FROM openjdk:8-alpine

LABEL "Author"="Teler" \
    "email"="terler96@qq.com" \
    version=0.0.1 \
    description="jar运行在docker中的示例系统"

COPY target/app.jar /home/app/app.jar
WORKDIR /home/app

ENTRYPOINT ["java","-jar","app.jar"]

EXPOSE 8080

执行命令行

docker build -t teler/app:1.0.1 .

-t指images名称
.指路径

    docker build -f <path>/Dockerfile -t <name>:<version> .

说明&注意点

我为了缩小体积使用的alpine版本，官方建议如下

This image is based on the popular Alpine Linux project, available in the alpine official image. Alpine Linux is much smaller than most distribution base images (~5MB), and thus leads to much slimmer images in general.
The OpenJDK port for Alpine is not in a supported release by OpenJDK, since it is not in the mainline code base. It is only available as early access builds of OpenJDK Project Portola. See also this comment. So this image follows what is available from the OpenJDK project’s maintainers.
What this means is that Alpine based images are only released for early access release versions of OpenJDK. Once a particular release becomes a “General-Availability” release, the Alpine version is dropped from the “Supported Tags”; they are still available to pull, but will no longer be updated.