Docker安装发生在入口点执行之前或之后 [英] Docker mount happens before or after entrypoint execution
问题描述
我正在构建一个Docker映像以运行基于Spring Boot的应用程序.我希望用户能够通过将包含application.properties的文件夹装入容器来提供运行时属性文件.这是我的Dockerfile，
I'm building a Docker image to run my Spring Boot based application. I want to have user to be able to feed a run time properties file by mounting the folder containing application.properties into container. Here is my Dockerfile,
FROM java:8
RUN mkdir /app
RUN mkdir /app/config
ADD myapp.jar /app/
ENTRYPOINT ["java","-jar","/app/myapp.jar"]
启动容器时，我会运行
docker run -d -v /home/user/config:/app/config myapp:latest
其中/home/user/config 包含 application.properties ，我希望jar文件在运行时拾取.
where /home/user/config contains the application.properties I want the jar file to pick up during run time.
但是，这不起作用，应用程序运行不会拾取此已挂载的属性文件，它使用的是jar中包装的默认文件.但是，当我 exec 进入启动的容器并再次手动运行entrypoint cmd时，通过拾取我安装的文件，它可以按预期工作.入口点?还是在这种情况下我没有正确编写Dockerfile?
However this doesn't work, the app run doesn't pick up this mounted properties file, it's using the default one packed inside the jar. But when I exec into the started container and manually run the entrypoint cmd again, it works as expected by picking up the file I mounted in. So I'm wondering is this something related to how mount works with entrypoint? Or I just didn't write the Dockerfile correctly for this case?
推荐答案
Spring Boot searches for application.properties inside a /config subdirectory of the current directory (among other locations). In your case, current directory is / (docker default), so you need to change it to /app. To do that, add
WORKDIR /app
在 ENTRYPOINT 行之前.
并回答您最初的问题:在容器中的任何东西运行之前完成挂载.
And to answer your original question: mounts are done before anything inside the container is run.
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