From c4b9e1c9add2ab3c97cc89c8f6b12b83750cea1d Mon Sep 17 00:00:00 2001 From: Sven Dowideit Date: Mon, 10 Feb 2014 16:10:15 +1000 Subject: [PATCH] point out that ENV DEBIAN_FRONTEND will persist, so its not recommended Docker-DCO-1.1-Signed-off-by: Sven Dowideit (github: SvenDowideit) --- docs/sources/reference/builder.rst | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/docs/sources/reference/builder.rst b/docs/sources/reference/builder.rst index 571824c36c..4b6a151006 100644 --- a/docs/sources/reference/builder.rst +++ b/docs/sources/reference/builder.rst @@ -251,9 +251,14 @@ value ````. This value will be passed to all future ``RUN`` instructions. This is functionally equivalent to prefixing the command with ``=`` +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 =``. + .. 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: