point out that ENV DEBIAN_FRONTEND will persist, so its not recommended
Docker-DCO-1.1-Signed-off-by: Sven Dowideit (github: SvenDowideit)
@@ -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:
