==============
ubuntu-minimal
==============
The ``ubuntu-minimal`` element uses debootstrap for generating a
minimal image. In contrast the ``ubuntu`` element uses the cloud-image
as the initial base.
.. note::
You will need to install a working debootstrap for diskimage-builder. The
version you install may not support all Debian and Ubuntu releases that you
want to bootstrap. Consider using the zuul/nodepool-builder docker image
instead as maximum compatibility is attempted there.
By default this element creates the latest LTS release. The exact setting can
be found in the `ubuntu-common <https://docs.openstack.org/diskimage-builder/latest/elements/ubuntu-common/README.html>`_
element's ``environment.d`` directory in the variable ``DIB_RELEASE``. If a
different release of Ubuntu should be created, the variable ``DIB_RELEASE`` can
be set appropriately.
Note that this element installs ``systemd-sysv`` as the init system for
18.04+.
Environment Variables
---------------------
DIB_UBUNTU_KERNEL:
:Required: No
:Default: ``linux-image-generic``
:Description: Specifies the kernel meta package to install in the image.
:Example: ``DIB_UBUNTU_KERNEL=linux-image-kvm``
:Options: ``linux-image-generic``, ``linux-image-kvm``,
``linux-image-virtual``
:Notes: The element must know about the package, otherwise it will select
the default.
DIB_UBUNTU_MIRROR_DISTS:
:Required: No
:Default: ``updates,security,backports``
:Description: Allow to manage 'dists' repos
:Example: ``DIB_UBUNTU_MIRROR_DISTS=updates,security``
:Notes: For some deployment,
is may be required to disable backport|update|etc packages integration.
.. element_deps::
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