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The official documentation can be found here.

Is it possible to pass environment variables from one RUN to another, in Dockerfile?

I’m doing this:

RUN export FOO=hello
RUN env

The second RUN doesn’t see the FOO environment variable. Is it a limitation of Docker?

If it is, how do I set PATH in one RUN and make it available in another RUN?

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2

Answers


  1. 0

    The docker RUN command initializes its own shell when called in a new line. There is no connection between the two RUN commands.

    Bash commands, however, can be combined in a single RUN statement.

    RUN export FOO=hello 
    && env
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  2. 0

    Why not use Dockerfile’s ENV instruction for this purpose?

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