manila-image-elements/elements/manila-ubuntu-minimal/README.rst

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manila-ubuntu-minimal
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Create a minimal image based on Ubuntu. Default is trusty but DIB_RELEASE
is mapped to any series of Ubuntu.
If necessary, a custom apt keyring and debootstrap script can be supplied
to the debootstrap command via DIB_APT_KEYRING and
DIB_DEBIAN_DEBOOTSTRAP_SCRIPT respectively. Both options require the use of
absolute rather than relative paths.
Use of this element will also require the tool 'debootstrap' to be available
on your system.
The DIB_OFFLINE or more specific DIB_DEBIAN_USE_DEBOOTSTRAP_CACHE variables
can be set to prefer the use of a pre-cached root filesystem tarball.
The DIB_DEBOOTSTRAP_EXTRA_ARGS environment variable may be used to pass
extra arguments to the debootstrap command used to create the base
filesystem image. If --keyring is used in DIB_DEBOOTSTRAP_EXTRA_ARGS,
it will override DIB_APT_KEYRING if that is used as well.