Maven docker缓存依赖项 [英] Maven docker cache dependencies
问题描述
我正在尝试使用docker自动化maven构建。我想要构建的项目花了将近20分钟来下载所有依赖项，所以我尝试构建一个可以缓存这些依赖项的docker镜像，但它似乎并没有保存它。我的Dockerfile是
I'm trying to use docker to automate maven builds. The project I want to build takes nearly 20 minutes to download all the dependencies, so I tried to build a docker image that would cache these dependencies, but it doesn't seem to save it. My Dockerfile is
FROM maven:alpine
RUN mkdir -p /usr/src/app
WORKDIR /usr/src/app
ADD pom.xml /usr/src/app
RUN mvn dependency:go-offline
图像构建，它确实下载了所有内容。但是，生成的图像与基本 maven：alpine 图像的大小相同，因此它似乎没有缓存图像中的依赖项。当我尝试将图像用于 mvn compile 时，它将重新下载所有内容20分钟。
The image builds, and it does download everything. However, the resulting image is the same size as the base maven:alpine image, so it doesn't seem to have cached the dependencies in the image. When I try to use the image to mvn compile it goes through the full 20 minutes of redownloading everything.
是有可能构建一个缓存我的依赖项的maven图像，这样每次我使用图像执行构建时都不必下载吗？
Is it possible to build a maven image that caches my dependencies so they don't have to download everytime I use the image to perform a build?
我正在运行以下命令命令：
I'm running the following commands:
docker build -t my-maven .
docker run -it --rm --name my-maven-project -v "$PWD":/usr/src/mymaven -w /usr/src/mymaven my-maven mvn compile
我的理解是，无论 RUN 在docker构建过程成为结果图像的一部分。
My understanding is that whatever RUN does during the docker build process becomes part of the resulting image.
推荐答案
通常 pom.xml中没有变化文件，但是当您尝试启动docker映像构建时，其他src代码会更改。在这种情况下，您可以这样做：
Usually there's no change in pom.xml file but other src code changes when you're attempting to start docker image build. In such circumstance you can do this:
仅供参考：
FROM registry.cn-hangzhou.aliyuncs.com/acs/maven:3-jdk-8
MAINTAINER Eric Kim <kimjuny@foxmail.com>
ENV PITBULL_EUREKA=/usr/src/app
RUN mkdir -p $PITBULL_EUREKA
WORKDIR $PITBULL_EUREKA
# add pom.xml only here, and download dependency
ADD pom.xml $PITBULL_EUREKA
RUN ["/usr/local/bin/mvn-entrypoint.sh", "mvn", "verify", "clean", "--fail-never"]
# now we can add all source code and start compiling
ADD . $PITBULL_EUREKA
RUN ["mvn", "package"]
EXPOSE 8888
CMD ["java", "-jar", "./target/eureka-0.0.1-SNAPSHOT.jar"]
所以关键是：
-
添加
pom.xml文件。
然后 mvn verify --fail-never 它，它将下载maven依赖项。
then mvn verify --fail-never it, it will download maven dependencies.
然后添加所有源文件，然后开始编译（ mvn package ）。
add all your source file then, and start your compilation(mvn package).
当您的 pom.xml 发生变化时，或者您是第一次运行此脚本时， docker将执行1 - > 2 - > 3.当 pom.xml 文件中没有更改时，docker将跳过步骤1,2并直接执行3。
When there are changes in your pom.xml or you are running this script for the first time, docker will do 1 -> 2 -> 3. When there are no changes in pom.xml file, docker will skip step 1、2 and do 3 directly.
这个简单的技巧可用于许多其他包管理环境。
This simple trick can be used in many other package management circumstances.
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