修改从现有镜像创建的docker镜像 [英] Modifying a docker image that was created from an existing one

问题描述

通过一种方法，我基于现有图像创建了一个新图像.
我没有原始图像的Dockerfile，当容器启动时发生了一些事情我无法改变-就是那样.

By following a how-to, I've created a new image based on an existing one.
I don´t have the original images' Dockerfile and there are things happening when the container starts that I can't change - that´s how it seems anyway.

是否可以修改基本映像的Dockerfile中的命令?

Is there a way to modify the commands in the Dockerfile of the base image?

例如，容器在启动时运行bash脚本，我想更改它.

For example the container runs a bash script when it starts, I want to change this.

推荐答案

要回答您的特定问题:"容器在启动时运行bash脚本，我想对此进行更改".假设您要运行/script.sh (图像的一部分)而不是默认值，则可以使用以下方法实例化容器:

To answer your specific q: "the container runs a bash script when it starts, i want to change this". Let's assume you want to run /script.sh (part of the image) instead of the default, you can instantiate a container using:

docker run --entrypoint /script.sh repo/image

如果 script.sh 不是图像的一部分，并且/或者您不希望每次使用上述-entrypoint 显式地指定它，则可以准备一个包含并运行您自己的 script.sh :

If script.sh isn't part of the image and/or you prefer not having to specify it explicitly each time with --entrypoint as above, you can prepare an image that contains and runs your own script.sh:

1. 创建一个空目录并在其中复制或创建 script.sh

2. 使用以下内容创建 Dockerfile :

FROM repo/image
ADD script.sh /
ENTRYPOINT /script.sh

docker build -t ="myimage".

注意:

• 运行容器时(第4步)，不再需要指定-entrypoint ，因为我们已将其默认为 Dockerfile .
• 就这么简单；无需注册docker hub或任何其他类似的东西(尽管当然建议及时；-)

• When running the container (step 4), it's no longer necessary to specify --entrypoint since we have it defaulted in the Dockerfile.
• It's really that simple; no need to sign up to docker hub or any such thing (although it's of course recommended in time ;-)

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