openstack/diskimage-builder
Code Issues Proposed changes
55ea2b5633
diskimage-builder/elements/debootstrap
History
Gregory Haynes 2678209e94 Don't cache debootstrap rootfs by default 
By default we create a tarball of any debootstrap rootfs we create. For
the majority of use cases this is a large performance hit for no
benefit. Lets make this an opt-in feature.

Change-Id: I58fc485aacacaa17243bf9ce760ed91256d1f182
2016-02-16 07:55:19 +00:00
..
install.d Fix debian-minimal image building 2016-01-28 16:41:35 +03:00
root.d Don't cache debootstrap rootfs by default 2016-02-16 07:55:19 +00:00
element-deps Split the debootstrap functions into an element 2015-04-26 18:04:59 +00:00
package-installs.yaml Split the debootstrap functions into an element 2015-04-26 18:04:59 +00:00
README.rst Don't cache debootstrap rootfs by default 2016-02-16 07:55:19 +00:00

README.rst

debootstrap

Base element for creating minimal debian-based images.

This element is incomplete by itself, you'll want to use the debian-minimal or ubuntu-minimal elements to get an actual base image.

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. It should be available on Ubuntu, Debian, and Fedora.

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 is used in DIB_DEBOOTSTRAP_EXTRA_ARGS, it will override DIB_APT_KEYRING if that is used as well.

The DIB_DEBOOTSTRAP_CACHE variable can be used to cache the created root filesystem. By default this is 0 (disabled) and any other value enables this. If run in offline mode then the most recently cached rootfs is used instead of being built.

Note on ARM systems

Because there is not a one-to-one mapping of ARCH to a kernel package, if you are building an image for ARM on debian, you need to specify which kernel you want in the environment variable DIB_ARM_KERNEL. For instance, if you want the linux-image-mx5 package installed, set DIB_ARM_KERNEL to mx5.