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Add "DEBIAN_FRONTEND" to FAQ 

Added some explanation on using ‘DEBIAN_FRONTEND’ to the FAQs. As
discussed here;
https://github.com/docker/docker/pull/7035#issuecomment-50967867

Docker-DCO-1.1-Signed-off-by: Sebastiaan van Stijn <github@gone.nl> (github: thaJeztah)
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Sebastiaan van Stijn 2014-08-10 20:09:46 +02:00
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@ -225,6 +225,38 @@ Downloading and installing an "all-in-one" .deb or .rpm sounds great at first,
except if you have no way to figure out that it contains a copy of the
OpenSSL library vulnerable to the [Heartbleed](http://heartbleed.com/) bug.
### Why is `DEBIAN_FRONTEND=noninteractive` discouraged in Dockerfiles?
When building Docker images on Debian and Ubuntu you may have seen errors like:
unable to initialize frontend: Dialog
These errors don't stop the image from being built but inform you that the
installation process tried to open a dialog box, but was unable to.
Generally, these errors are safe to ignore.
Some people circumvent these errors by changing the `DEBIAN_FRONTEND`
environment variable inside the Dockerfile using:
ENV DEBIAN_FRONTEND=noninteractive
This prevents the installer from opening dialog boxes during installation
which stops the errors.
While this may sound like a good idea, it *may* have side effects.
The `DEBIAN_FRONTEND` environment variable will be inherited by all
images and containers built from your image, effectively changing
their behavior. People using those images will run into problems when
installing software interactively, because installers will not show
any dialog boxes.
Because of this, and because setting `DEBIAN_FRONTEND` to `noninteractive` is
mainly a 'cosmetic' change, we *discourage* changing it.
If you *really* need to change its setting, make sure to change it
back to its [default value](https://www.debian.org/releases/stable/i386/ch05s03.html.en)
afterwards.
### Can I help by adding some questions and answers?
Definitely! You can fork [the repo](https://github.com/docker/docker) and