Dockerfile如何引用宿主机的环境变量啊？

Question

我在设置镜像的环境变量的时候，他的值从宿主机的环境变量来。

Answer 1

Dockerfile cannot directly use the host’s environment variables when building the image, but it can be achieved in the following ways

Dockerfile:

...
ARG JAVA_HOME
ENV JAVA_HOME $JAVA_HOME
...

Build using:

docker build --build-arg JAVA_HOME=$JAVA_HOME ...

Answer 2

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