问题描述
我想了解CMD和ENTRYPOINT的工作原理.因此，我刚刚创建了一个非常简单的 Dockerfile
I want to understand how CMD and ENTRYPOINT works. So, I just created a very simple Dockerfile
FROM scratch
CMD echo "Hello First"
ENTRYPOINT echo "Hello second"
然后我构建此图像:
docker build -t my_image .
日志如下:
当我创建此图像的容器时，它返回:
When I create a container of this image it returns:
docker run my_image
错误是:
有人可以帮助我解决错误吗?
Can someone please help me about error?
推荐答案
这里发生了两件事.
以 FROM从头开始的Dockerfile从根本没有任何内容的基础映像开始.它是完全空的.除了Docker为您提供的几个设备文件之外，没有一组基础工具或库或其他任何东西.
A Dockerfile that starts FROM scratch starts from a base image that has absolutely nothing at all in it. It is totally empty. There is not a set of base tools or libraries or anything else, beyond a couple of device files Docker pushes in for you.
Docker将 ENTRYPOINT echo ... 命令重写为 ENTRYPOINT ["/bin/sh"，-c"，"echo ..."] ，并导致完全忽略 CMD .除非被 docker run --entrypoint 覆盖，否则它将成为容器运行的主要过程.
The ENTRYPOINT echo ... command gets rewritten by Docker into ENTRYPOINT ["/bin/sh", "-c", "echo ..."], and causes the CMD to be totally ignored. Unless overridden with docker run --entrypoint, this becomes the main process the container runs.
由于它是 FROM临时映像，并且完全不包含任何内容，因此它不包含外壳程序，因此出现"/bin/sh:无此类文件或目录"错误.
Since it is a FROM scratch image and contains absolutely nothing at all, it doesn't contain a shell, hence the "/bin/sh: no such file or directory" error.
这篇关于启动容器过程导致& quot; exec:\& quot;/bin/sh \& quot:stat/bin/sh:无此类文件或目录" ;:未知的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持！