当docker-maven插件尝试构建映像时发生什么？ [英] What is happening when docker-maven plugin tries to build image?

问题描述

我正在Docker容器中运行Jenkins，Jenkins尝试运行我的maven构建。作为构建的一部分，docker maven插件指示它构建一个docker映像。

POM的一部分在下面。

 < plugin> ; 
< groupId> com.spotify< / groupId> 
< artifactId> docker-maven-plugin< / artifactId> 
< version> 0.3.8< / version> 
< configuration> 
< imageName>示例< / imageName> 
< baseImage> java：latest< / baseImage> 
< skipDockerBuild> false< / skipDockerBuild> 
< cmd> [java，-jar，myLogThread-jar-with-dependencies.jar]< / cmd> 
< resources> 
< resource> 
< directory> target /< / directory> 
< include> config.properties< / include> 
< / resource> 
< resource> 
< directory> $ {project.build.directory}< / directory> 
< include> myLogThread-jar-with-dependencies.jar< / include> 
< / resource> 
< / resources> 
< / configuration> 
< / plugin> 
  

maven构建运行，直到它尝试构建映像，此时出现以下错误消息out：

  [INFO]构建图像示例
 [INFO] I / O异常（java.io.IOException）在{}  - > unix：// localhost：80处理请求时被捕获：拒绝
  

我可以进入正确的目录，Dockerfile就在那里。

我也可以运行 sudo docker build。，它将构建没有问题的图像。

为什么maven构建失败？对localhost有什么要求：80？注意：我已经将Docker套接字和二进制文件加载到此容器中

div class =h2_lin>解决方案

可以通过在Jenkins中添加 DOCKER_HOST 环境变量来解决。

如下设置Docker守护程序：

  [/ etc / sysconfig / docker] 
选项= -  H tcp：//127.0.0.1：4243
  

Jenkins作业（注入环境变量） ：

  DOCKER_HOST = tcp：//127.0.0.1：4243 
  

I am running Jenkins in a docker container and Jenkins tries to run my maven build. As part of the build, the docker maven plugin instructs it to build a docker image.

That part of the POM is below.

<plugin>
    <groupId>com.spotify</groupId>
    <artifactId>docker-maven-plugin</artifactId>
    <version>0.3.8</version>
    <configuration>
        <imageName>example</imageName>
        <baseImage>java:latest</baseImage>
        <skipDockerBuild>false</skipDockerBuild>
        <cmd>["java", "-jar", "myLogThread-jar-with-dependencies.jar"]</cmd>
        <resources>
            <resource>
                <directory>target/</directory>
                <include>config.properties</include>
            </resource>
            <resource>
                <directory>${project.build.directory}</directory>
                <include>myLogThread-jar-with-dependencies.jar</include>
            </resource>
        </resources>
    </configuration>
</plugin>

The maven build runs until it attempts to build the image, at which point the following error message is spat out:

[INFO] Building image example
[INFO] I/O exception (java.io.IOException) caught when processing request to {}->unix://localhost:80: Permission denied

I can go into the correct directory and the Dockerfile is there.

I can also run sudo docker build . and it will build the image with no issues.

Why is the maven build failing? What request is being made to localhost:80? How can I correct this so that maven can build my image?

Note: I have mounted the docker socket and binary in this container

解决方案

This can be resolved by adding DOCKER_HOST environment variable in Jenkins.

Setup your docker daemon like this:

[/etc/sysconfig/docker]
OPTIONS="-H tcp://127.0.0.1:4243"

Jenkins Jobs (Inject environment variables):

DOCKER_HOST=tcp://127.0.0.1:4243

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