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Hints on how to create a Debian image for [[Docker]]. This page attempts to document how to create a Debian image for [[Docker]].
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See http://sfxpt.wordpress.com/2013/11/17/debianubuntu-package-developing-with-docker-continued/ for original reference. [[https://index.docker.io/_/debian/|Docker.com provide Debian images]] they describe as "semi-official". They are built from stock Debian (for details on how the root filesystem is made in a fairly secure way, read about [[https://github.com/debuerreotype/debuerreotype|Debuerreotype]]). The modifications and image are maintained by `paultag@` and `tianon@`.
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The following is work in progress WITHOUT ANY WARANTY You can create your own Debian Docker images using the methods described below.
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Note that due to bug #740855 `/usr/share/docker.io/contrib/mkimage-debootstrap.sh` needs to be patched at the moment. '''The following is work in progress WITHOUT ANY WARRANTY'''
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You may create an image with : <<TableOfContents()>>

== Methods ==

=== Using (upstream provided "contrib" script) mkimage.sh ===

The `docker.io` package ships the `/usr/share/docker.io/contrib/mkimage.sh` script which may be used, alongside the companion script `/usr/share/docker.io/contrib/mkimage/debootstrap` to create a Docker image for Debian (or Ubuntu) using `debootstrap`, and with or without further tweaks.

You may create an image for the `stable` suite (using the `minbase` debootstrap variant) with :
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.../mkimage-debootstrap.sh $USER/debian sid sudo .../mkimage.sh -t $USER/minbase debootstrap --variant=minbase stable
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sudo docker.io run -i $USER/debian:sid echo "hello world" sudo docker run -i $USER/minbase echo "hello world"
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See also See http://www.debian-administration.org/article/696/A_brief_introduction_to_using_docker#a2 Contrary to the former mkimage-debootstrap.sh (now deprecated, see below), contrib/mkimage/debootstrap does not need the mandatory `variant` parameter, and can invoke debootstrap without a specific variant, using its default settings.
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=== Manual method ===
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A dockerfile may also directly the following directive : To build pristine debian images, without cloud/docker-specific, customisations, you can use the scripts at https://github.com/jmtd/debian-docker. These use {{{debootstrap}}} to prepare a basic filesystem and add them into a docker image. Suggestions for improvements are very welcome.

Images built from these scripts are pushed to the Docker Registry as {{{jmtd/debian:wheezy}}}, {{{jmtd/debian:jessie}}} etc., but there is presently no image verification in place (so no way to cryptographically prove the provenance of the images).

See also http://www.debian-administration.org/article/696/A_brief_introduction_to_using_docker#a2 .

=== Using mkimage-debootstrap.sh (now flagged as deprecated by upstream) ===

The `docker.io` package still ships the, now deprecated, `/usr/share/docker.io/contrib/mkimage-debootstrap.sh` script which may be used to create a Docker image for Debian (or Ubuntu) using `debootstrap`, and with or without further tweaks.

You may create an image for the `stable` suite (using the `minbase` debootstrap variant) with :
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FROM debian:sid .../mkimage-debootstrap.sh $USER/minbase stable
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The image may then be used with :
{{{
sudo docker run -i $USER/minbase:stable echo "hello world"
}}}

As an alternative to upstream's choices, you may modify the script so that it does not use the minbase variant by default (see for instance [[https://raw.github.com/olberger/docker/debian/contrib/mkimage-debootstrap.sh|obergix's version]] and adjust to your needs), or use the newer mkimage.sh (see above).

== Using the newly built image to create a test container ==

A dockerfile may then refer to your image using the following directive :
{{{
FROM YOURUSER/minbase:stable
}}}

You may test it with :
{{{
echo "FROM $USER/minbase:stable" | docker build -t $USER/test:stable -
}}}

== Alternative, opinionated images ==
For alternative images that have some Docker adaptations, see https://github.com/jgoerzen/docker-debian-base

== Resources ==
 * See http://sfxpt.wordpress.com/2013/11/17/debianubuntu-package-developing-with-docker-continued/ for a description of using `mkimage-debootstrap.sh`.
 * Nickoloff, Jeff, Docker in Action (http://www.manning.com/nickoloff/), Manning Publications, 2014, ISBN 978-1-6334-3023-5

----

CategoryVirtualization

This page attempts to document how to create a Debian image for Docker.

Docker.com provide Debian images they describe as "semi-official". They are built from stock Debian (for details on how the root filesystem is made in a fairly secure way, read about Debuerreotype). The modifications and image are maintained by paultag@ and tianon@.

You can create your own Debian Docker images using the methods described below.

The following is work in progress WITHOUT ANY WARRANTY

Methods

Using (upstream provided "contrib" script) mkimage.sh

The docker.io package ships the /usr/share/docker.io/contrib/mkimage.sh script which may be used, alongside the companion script /usr/share/docker.io/contrib/mkimage/debootstrap to create a Docker image for Debian (or Ubuntu) using debootstrap, and with or without further tweaks.

You may create an image for the stable suite (using the minbase debootstrap variant) with :

sudo .../mkimage.sh -t $USER/minbase debootstrap --variant=minbase stable

The image may then be used with :

sudo docker run -i $USER/minbase echo "hello world"

Contrary to the former mkimage-debootstrap.sh (now deprecated, see below), contrib/mkimage/debootstrap does not need the mandatory variant parameter, and can invoke debootstrap without a specific variant, using its default settings.

Manual method

To build pristine debian images, without cloud/docker-specific, customisations, you can use the scripts at https://github.com/jmtd/debian-docker. These use debootstrap to prepare a basic filesystem and add them into a docker image. Suggestions for improvements are very welcome.

Images built from these scripts are pushed to the Docker Registry as jmtd/debian:wheezy, jmtd/debian:jessie etc., but there is presently no image verification in place (so no way to cryptographically prove the provenance of the images).

See also http://www.debian-administration.org/article/696/A_brief_introduction_to_using_docker#a2 .

Using mkimage-debootstrap.sh (now flagged as deprecated by upstream)

The docker.io package still ships the, now deprecated, /usr/share/docker.io/contrib/mkimage-debootstrap.sh script which may be used to create a Docker image for Debian (or Ubuntu) using debootstrap, and with or without further tweaks.

You may create an image for the stable suite (using the minbase debootstrap variant) with :

.../mkimage-debootstrap.sh $USER/minbase stable

The image may then be used with :

sudo docker run -i $USER/minbase:stable echo "hello world"

As an alternative to upstream's choices, you may modify the script so that it does not use the minbase variant by default (see for instance obergix's version and adjust to your needs), or use the newer mkimage.sh (see above).

Using the newly built image to create a test container

A dockerfile may then refer to your image using the following directive :

FROM YOURUSER/minbase:stable

You may test it with :

echo "FROM $USER/minbase:stable" | docker build -t $USER/test:stable -

Alternative, opinionated images

For alternative images that have some Docker adaptations, see https://github.com/jgoerzen/docker-debian-base

Resources


CategoryVirtualization