History

Matthew Thode 9231f9b57d Add Gentoo support to nodepool This commit adds Gentoo support to elements needed to build a Gentoo nodepool image. The previous version of this commit had the default section of the pkg-map in the wrong area, specifically in the following file. nodepool/elements/infra-package-needs/pkg-map Change-Id: Ic686c325bc06564585a2e3ac50cadd7556612333		2016-10-16 20:37:14 -05:00
..
cache-bindep	Add Gentoo support to nodepool	2016-10-16 20:37:14 -05:00
cache-devstack	Add Gentoo support to nodepool	2016-10-16 20:37:14 -05:00
infra-package-needs	Add Gentoo support to nodepool	2016-10-16 20:37:14 -05:00
initialize-urandom	Remove After=network.target from initialize-urandom service	2016-09-01 15:12:40 -04:00
node-devstack	Move prepare-node to it's own element	2016-05-19 21:38:11 -05:00
nodepool-base	Add Gentoo support to nodepool	2016-10-16 20:37:14 -05:00
openstack-repos	Cache all branches in dib repo cache	2016-07-14 15:54:51 -07:00
prepare-node	Move prepare-node to it's own element	2016-05-19 21:38:11 -05:00
puppet	Add Gentoo support to nodepool	2016-10-16 20:37:14 -05:00
slave-db	Reorganizes project-config	2014-09-25 11:41:04 -04:00
stackviz	Disable npm for stackviz on fedora-24	2016-07-13 19:08:44 -04:00
zuul-worker	Add Gentoo support to nodepool	2016-10-16 20:37:14 -05:00
README.rst	Update doc to have 'debootstrap' dep and describe minimal	2016-10-12 19:27:05 -07:00

README.rst

Using diskimage-builder to build devstack-gate nodes

In addition to being able to just download and consume images that are the same as what run devstack-gate, it's easy to make your own for local dev or testing - or just for fun.

Install diskimage-builder

Install the dependencies:

sudo apt-get install kpartx qemu-utils curl python-yaml debootstrap

Install diskimage-builder:

sudo -H pip install diskimage-builder

Build an image

Building an image is simple, we have a script!

bash tools/build-image.sh

See the script for environment variables to set distribution, etc. By default it builds an ubuntu-minimal based image. You should be left with a .qcow2 image file of your selected distribution.

Infra uses the -minimal build type for building Ubuntu/CentOS/Fedora. For example: ubuntu-minimal.

It is a good idea to set TMP_DIR to somewhere with plenty of space to avoid the disappointment of a full-disk mid-way through the script run.

While testing, consider exporting DIB_OFFLINE=true, to skip updating the cache.

Mounting the image

If you would like to examine the contents of the image, you can mount it on a loopback device using qemu-nbd.

sudo apt-get install qemu-utils
sudo modprobe nbd max_part=16
sudo mkdir -p /tmp/newimage
sudo qemu-nbd -c /dev/nbd1 /path/to/devstack-gate-precise.qcow2
sudo mount /dev/nbd1p1 /tmp/newimage

or use the scripts

sudo apt-get install qemu-utils
sudo modprobe nbd max_part=16
sudo tools/mount-image.sh devstack-gate-precise.qcow2
sudo tools/umount-image.sh

Other things

It's a qcow2 image, so you can do tons of things with it. You can upload it to glance, you can boot it using kvm, and you can even copy it to a cloud server, replace the contents of the server with it and kexec the new kernel.