如何为Docker的环境变量指定文件 [英] How to specify a file for environment variables for docker

问题描述

我在代码中需要一些环境变量。

I have a few environment variables that I need inside of my code.

当我开始构建docker容器时，我希望将这些环境变量烘烤到我的容器中

And when I starts building a docker container, I wish to bake those environment variables into my docker container.

我知道dockerfile指令'ENV'确实做到了这一点，我想知道是否有一种方法可以指向文件而不是在文件内部写入文件。 Dockerfile

I understand that the dockerfile directive 'ENV' does exactly that, I wonder if there is a way to point to an file instead of writing it inside of the Dockerfile

推荐答案

AFAIK，没有这种方法可以在使用Dockerfile的构建步骤中使用文件注入环境变量。但是，在大多数情况下，人们最终还是使用 entrypoint 脚本&在 docker运行或 docker-compose up 期间注入变量。

AFAIK, there is no such way to inject environment variables using a file during the build step using Dockerfile. However, in most cases, people do end up using an entrypoint script & injecting variables during the docker run or docker-compose up.

如果有必要，您可能需要编写一个外壳包装程序，以动态更改 Dockerfile 中的值通过将键值对文本文件作为输入或使其如下所示，但需要将ENV文件名包含在Dockerfile中，如@thaJeztah在链接-

In case it's a necessity you might need to write a shell wrapper which will change the values in the Dockerfile dynamically by taking a key-value pair text file as an input or make it something as below but the ENV file name need to be included in Dockerfile as suggested by @thaJeztah in link -

COPY my-env-vars /    
RUN export $(cat my-env-vars | xargs)

这是一个未解决的问题-
https://github.com/moby/moby/issues/28617

It's an open issue - https://github.com/moby/moby/issues/28617

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