This is a bit of a draft, but I came across this issue in the documentation. When I searched for `docker apt-get` I found this page and copy-pasted the first example, but then I remembered it's best practice to install all packages at once and after that clear the `lists` to minimize the image size. Putting the example with all best practices first might help newer docker users to produce smaller images.
The `ENV key value` form can be ambiguous, for example, the following defines
a single env-variable (`ONE`) with value `"TWO= THREE=world"`:
ENV ONE TWO= THREE=world
While we cannot deprecate/remove that syntax (as it would break existing
Dockerfiles), we should reduce exposure of the format in our examples.
Also updating some code-blocks that were missing language-hints
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
Unfortunately, the only reliable way to create internal links
is to use relative links to other Markdown files. This does
match the way links on GitHub work, but makes it harder to
create these links.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
* Fix incorrect links in compose section
there's a bug causing wrapped links to not work, and replacing
some links to point to the .md file, so that IDE's can check
if the anchors are valid. Also replaced some links to point
to their new location.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
* engine/swarm: update links
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
* Fix various broken links
There's a bug in the "jekyll-relative-links" plugin that causes wrapped links to not work.
Also replacing some links to point to the .md file, so that IDE's can check if the anchors
are valid. Finally, replaced some links to point to their new locations, so that users don't
get redirected..
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
- Remove the "Develop your apps on Docker" section, as there
was only a single section.
- Shorten titles in the navigation: the page itself still
has the full title. Some titles also didn't match the
title on the page.
- Changed "Docker build enhancements for 18.09" to
"Build images with BuildKit" to help discovery of the
BuildKit back-end.
- Some minor (Markdown) touch-ups of the BuildKit topic.
- Moved "Create a base image" lower in the navigation,
because it's an advanced topic that most users won't
be using (generally, using the official base images
from Docker Hub would be recommended).
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
If you try and build an image without a FROM instruction in the Dockerfile, the Docker daemon will throw an error. You must include "FROM scratch" to build a base image.
I read the previous wording as "Only works when run from a Linux host", where what it means is "Only works when building a Linux container".
In other words, build enhancements work just fine if building Linux containers via Docker for Mac/Windows.
This removes references to obsolete versions of Docker, and rewrites
the section on building from a Dockerfile piped through `stdin`.
Signed-off-by: Sebastiaan van Stijn <github@gone.nl>
