docker - Dockerfile在shell入口点之前运行入口点

Question

我想在将参数传递给shell入口点之前在运行时进行最后一分钟的设置，为实现这一点，我谨记以下几点:

ENTRYPOINT ./run_binary ${args}; /bin/sh -c
CMD ./run_binary

但是，通过执行此操作，似乎没有任何 CMD参数将其设置为shell入口点。有没有解决的办法？我只是想在二进制文件上运行设置步骤，然后再将控制权交还给Shell入口点(然后通过 CMD交给USER)。

Answer 1

您可以使用中间构建镜像来触发原始Dockerfile中的ONBUILD语句，请参阅:https://docs.docker.com/engine/reference/builder/#/onbuild

The ONBUILD instruction adds to the image a trigger instruction to be executed at a later time, when the image is used as the base for another build. The trigger will be executed in the context of the downstream build, as if it had been inserted immediately after the FROM instruction in the downstream Dockerfile.

This is useful if you are building an image which will be used as a base to build other images, for example an application build environment or a daemon which may be customized with user-specific configuration.

关于CMD和ENTRYPOINT，请参阅: https://docs.docker.com/engine/reference/builder/#understand-how-cmd-and-entrypoint-interact

Dockerfile应该指定CMD或ENTRYPOINT中的至少一个
命令。

使用容器作为容器时应定义

ENTRYPOINT 可执行文件。

CMD应该用作定义默认参数的方式
ENTRYPOINT命令或用于在命令行中执行即席命令
容器。

当使用替代方法运行容器时，

CMD将被覆盖
论点。