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point out that ENV DEBIAN_FRONTEND will persist, so its not recommended 

Docker-DCO-1.1-Signed-off-by: Sven Dowideit <SvenDowideit@home.org.au> (github: SvenDowideit)
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Sven Dowideit 2014-02-10 16:10:15 +10:00 committed by Tibor Vass
parent 808f83bc5c
commit 605f913fc5
1 changed files with 7 additions and 2 deletions
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9
docs/sources/reference/builder.rst
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@ -251,9 +251,14 @@ value ``<value>``. This value will be passed to all future ``RUN``
instructions. This is functionally equivalent to prefixing the command
with ``<key>=<value>``
The environment variables set using ``ENV`` will persist when a container is run
from the resulting image. You can view the values using ``docker inspect``, and change them using ``docker run --env <key>=<value>``.
.. note::
The environment variables will persist when a container is run
from the resulting image.
One example where this can cause unexpected consequenses, is setting
``ENV DEBIAN_FRONTEND noninteractive``.
Which will persist when the container is run interactively; for example:
``docker run -t -i image bash``
.. _dockerfile_add: