Docker提交创建的图像和ENTRYPOINT [英] Docker Commit Created Images and ENTRYPOINT

问题描述

如果您确保在Dockerfile中指定的原始CMD仍然设置为在 docker run 上运行，当您通过 docker commit进行更改？

How do you ensure that the original CMD specified in your Dockerfile is still set to run on docker run, when you make changes via docker commit?

以下是事件的顺序，以使之更清楚一点：

Here's the sequence of events, to make it a little clearer:

1. 使用Dockerfile创建图像


2. 使用 -ti --entrypoint / bin / bash 在某些时候进行一些修改


3. 在容器内进行更改并运行 docker commit 创建新的图像，使用新的标签
4. 
   
5. 当运行新图像时，原始Dockerfile的原始CMD条目不再运行

1. Create image with Dockerfile
2. Run container from image with -ti --entrypoint /bin/bash at some point afterwards to make some changes
3. Make changes inside container and run docker commit to create new image, with new tag
4. When the new image is run, the original CMD entry from the original Dockerfile is no longer run

So I'm asking; how do you reset the CMD from the Dockerfile again on a committed image?

推荐答案

您将创建一个Docker文件来设置 CMD 或 ENTRYPOINT 。只需将Dockerfile放在由 docker commit 返回的图像ID上。例如，给定：

You would create a Dockerfile to set the CMD or ENTRYPOINT. Simply base the Dockerfile on the image id returned by docker commit. For example, given this:

$ docker commit $(docker ps -lq)
69e9c08825508ec780efc86268a05ffdf4edae0999a2424dbe36cb04c2a15d6b

我可以创建一个如下所示的Docker文件：

I could create a Dockerfile that looked like this:

FROM 69e9c08825508ec780efc86268a05ffdf4edae0999a2424dbe36cb04c2a15d6b
CMD ["/bin/bash"]

然后使用它来构建一个新的图像：

And then use that to build a new image:

$ docker build .
Step 0 : FROM 69e9c08825508ec780efc86268a05ffdf4edae0999a2424dbe36cb04c2a15d6b
 ---> 69e9c0882550
Step 1 : CMD /bin/bash
 ---> Running in f886c783551d
 ---> 13a0f8ea5cc5
Removing intermediate container f886c783551d
Successfully built 13a0f8ea5cc5

说，你最好操作过程可能是不是在容器中进行更改，然后使用Docker commit;如果您只是依靠Dockerfile来实现必要的更改，那么最终会有更多可审核的变更。

That said, your best course of action is probably to not make changes in the container and then use Docker commit; you end up with a much more auditable set of changes if you just rely on the Dockerfile to implement the necessary changes in the first place.

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