在Docker构建期间在主机上执行命令 [英] Execute command on host during docker build

问题描述

是否可以创建在构建映像时在主机上执行命令的 Dockerfile ？

Is it possible to create Dockerfile that executes a command on host when image is being build?

现在我正在做

./script_that_creates_magic_file.sh
docker build .

使用Dockerfile：

with Dockerfile:

FROM alpine
COPY magic_file

我想成为能够做到：

docker build .

使用Dockerfile：

with Dockerfile:

FROM alpine
# invoke script_that_creates_magic_file.sh on the host
COPY magic_file

当然，此脚本与Dockerfile位于同一目录。

Of course, this script is in the same directory as Dockerfile.

推荐答案

（仅是建议）

我们通常使用以下结构来构建docker镜像：

We usually have the following structure for building our docker images:

my-image/
├── assets
│   ├── entrypoint.sh
│   └── install.sh
├── build.sh
├── Dockerfile
├── README.md
└── VERSION

• build.sh ：这是您应该调用 script_that_creates_magic_file.sh 的原因。其他常见任务包括下载所需文件或从主机临时复制ssh密钥。最后，此脚本将调用 docker build。


• Dockerfile ：照常，但取决于数量我们需要运行的命令中，我们可能有一个 install.sh


• install.sh ：这是复制并在容器中运行，安装软件包，删除不必要的文件等。在没有100％确定的情况下-我认为这种方法减少了层数，避免了在单个 RUN


• entrypoint.sh ：容器的入口点。允许我们在容器启动时执行任务（例如解析环境变量）并打印调试信息


• build.sh: This is were you should invoke script_that_creates_magic_file.sh. Other common tasks involve downloading required files or temporarily copying ssh keys from the host. Finally, this script will call docker build .
• Dockerfile: As usual, but depending on the number of commands we need to run we might have an install.sh
• install.sh: This is copied and run inside the container, installs packages, removes unnecessary files, etc. Without being 100% sure - I think such an approach reduces the number of layers avoiding multiple commands in a single RUN
• entrypoint.sh: Container's entrypoint. Allows us to perform tasks when the container starts (like parse environment variables) and print debugging info

我发现上述结构既方便又自-文档化，因为团队中的每个人都可以构建任何图像（无特殊说明/步骤）。自述文件在那里解释图像的作用...但是我不会对你说谎...它通常是空的...（或具有 h1 供gitlab显示）：）

I find the above structure convenient and self-documented since everyone in the team can build any image (no special instructions/steps). The README is there to explain what the image is doing... but I won't lie to you... it is usually empty... (or has an h1 for the gitlab to display) :)

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