May 2017
Beginner
300 pages
7h 26m
English
Content preview from Learning Docker - Second Edition
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The environment variables
The environment variables declared using the ENV or ARG instruction can be used in the ADD, COPY, ENV, EXPOSE, LABEL, USER, WORKDIR, VOLUME, STOPSIGNAL, and ONBUILD instructions.
Here is an example of the environment variable usage:
ARG BUILD_VERSION LABEL com.example.app.build_version=${BUILD_VERSION}
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