运行Java 11类的Dockerfile

Question

我正在尝试编写最简单的docker文件，该文件将在包InsertVolume中运行一个名为scripts的主类。这是我的Dockerfile：

FROM adoptopenjdk/openjdk11:latest

ENV MAVEN_VERSION 3.3.9

RUN mkdir -p /usr/share/maven \
  && curl -fsSL http://apache.osuosl.org/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz \
    | tar -xzC /usr/share/maven --strip-components=1 \
  && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn

CMD "mvn compile exec:java -Dexec.mainClass=\"scripts.InsertVolume\""

以下是运行命令的结果

 docker build -f Dockerfile -t test/insert .

[+] Building 0.8s (6/6) FINISHED                                                                                                                                                                                                                                          
 => [internal] load build definition from Dockerfile                                                                                                                                                                                                                 0.0s
 => => transferring dockerfile: 37B                                                                                                                                                                                                                                  0.0s
 => [internal] load .dockerignore                                                                                                                                                                                                                                    0.0s
 => => transferring context: 2B                                                                                                                                                                                                                                      0.0s
 => [internal] load metadata for docker.io/adoptopenjdk/openjdk11:latest                                                                                                                                                                                             0.7s
 => [1/2] FROM docker.io/adoptopenjdk/openjdk11:latest@sha256:ec7b07fa180861542ae8af31fbdad43f2f133170b43d29204a4b89e8f56a4c6f                                                                                                                                       0.0s
 => CACHED [2/2] RUN mkdir -p /usr/share/maven   && curl -fsSL http://apache.osuosl.org/maven/maven-3/3.3.9/binaries/apache-maven-3.3.9-bin.tar.gz     | tar -xzC /usr/share/maven --strip-components=1   && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn             0.0s
 => exporting to image                                                                                                                                                                                                                                               0.0s
 => => exporting layers                                                                                                                                                                                                                                              0.0s
 => => writing image sha256:22b094dc17fc3e41b7db6cea72819e5fef1edff6dedf4c291345546fb4f53019                                                                                                                                                                         0.0s
 => => naming to docker.io/test/insert                                                                                                                                                                                                                       0.0s

Use 'docker scan' to run Snyk tests against images to find vulnerabilities and learn how to fix them

然后，当我尝试使用以下方法运行映像时：

docker run test/insert

我收到错误：

docker: Error response from daemon: OCI runtime create failed: container_linux.go:367: starting container process caused: exec: "mvn compile exec:java -Dexec.mainClass=\"scripts.InsertVolume\"": executable file not found in $PATH: unknown.

当我针对项目执行时(不使用docker)，mvn命令mvn compile exec:java -Dexec.mainClass="scripts.InsertVolume"成功运行。

如何修改Dockerfile，使其编译和执行类scripts.InsertVolume？

在Dockerfile中使用mvn compile应该可以运行主类吗？

最新情况：

经过一些调试后，我可以使用以下Dockerfile：

FROM adoptopenjdk/openjdk11:latest

ENV MAVEN_VERSION 3.3.9

RUN mkdir -p /usr/share/maven \
  && curl -fsSL http://apache.osuosl.org/maven/maven-3/$MAVEN_VERSION/binaries/apache-maven-$MAVEN_VERSION-bin.tar.gz \
    | tar -xzC /usr/share/maven --strip-components=1 \
  && ln -s /usr/share/maven/bin/mvn /usr/bin/mvn

COPY pom.xml /build/
COPY src /build/src/

WORKDIR /build/

RUN mvn clean package

ENTRYPOINT ["java", "-jar", "target/test-1.0-SNAPSHOT.jar"]

# docker build -f Dockerfile -t test/insert .
# docker run -it --rm test/insert

更新的关键是复制项目src并使用命令进行构建：

COPY pom.xml /build/
COPY src /build/src/

WORKDIR /build/

RUN mvn clean package

Answer 1

首先检查tar -xzC /usr/share/maven --strip-components=1是否做了您认为应该做的事情。

换句话说，在您的Dockerfile中，添加用于测试RUN ls -alrth /usr/bin/mvn et RUN find /usr/share/maven/以重复检查符号链接/usr/bin/mvn实际上引用了现有的/usr/share/maven/bin/mvn文件。

您也可以对docker run -it --rm test/insert bash进行同样的操作。