如何在容器中注入Docker容器构建时间戳？ [英] How to inject Docker container build timestamp in container?

问题描述

我想构建一个在其启动日志中显示其构建日期时间的容器。有没有办法将信息从我的构建机器注入到容器中？

I would like to build a container which shows up in its startup log its build datetime. Is there a way to have that information injected from my build machine into the container ?

推荐答案

在运行过程中每个RUN步骤的输出build是对文件系统的更改。因此，您可以将日期输出到图像中的文件。容器中的日志只是您运行的命令的标准输出。这样，您就可以在入口点中列出日期了。

The output of each RUN step during a build is the changes to the filesystem. So you can output the date to a file in your image. And the logs from the container are just the stdout from commands you run. So you can cat out the date inside your entrypoint.

在代码中，您将在Dockerfile的末尾：

In code, you'd have at the end of your Dockerfile:

RUN date >/build-date.txt

在入口点脚本中：

#!/bin/sh
#.... Initialization steps
echo Image built: $(cat /build-date.txt)
#.... More initialization steps
# run the command
exec "$@"

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