Michael Johnson e433aebf7d Add DIB_UBUNTU_KERNEL to ubuntu-minimal

This patch adds a new environment variable to the ubuntu-minimal
element called DIB_UBUNTU_KERNEL that allows you to specify the kernel
meta package that will be using to install the kernel inside the image.
It supports "linux-image-generic" (The default), "linux-image-kvm", and
"linux-image-virtual".
This allows building images that are smaller in size (~200MB smaller
qcow2) that have only the kernel modules necessary for virtual
machines.

Change-Id: I8ce65e1d357d15e8ed8995ad1dcaea02bbd1986f

2019-06-20 10:18:23 -07:00

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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.

By default this element creates the latest LTS release. The exact setting can be found in the 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.

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ubuntu-minimal

Environment Variables

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