History

James E. Blair fc792f3371 Cache dstast_graph on nodepool images So that we can create dstat graphs at the end of devstack and other jobs, cache the dstat_graph repository on our images. dstat_graph is MIT licensed, but as far as I can tell, does not have a release and is not packaged in Debian or Ubuntu. Change-Id: I6cb0aa525dca0ee700d2d7548ccbb8d6af6ae92e		2019-07-02 07:32:11 -07:00
..
cache-devstack	Cache dstast_graph on nodepool images	2019-07-02 07:32:11 -07:00
control-plane-minimal	Build ubuntu bionic minimal images for control plane	2019-05-21 12:49:25 -05:00
infra-package-needs	fix rsyslog builds on gentoo	2018-10-07 05:11:12 -05:00
initialize-urandom	Fix flake8	2017-10-21 18:37:10 +02:00
nodepool-base	Switch from 1.1.1.1 to 1.0.0.1	2019-04-25 13:14:53 +00:00
openstack-repos	Update nodepool for OpenDev	2019-04-20 13:40:41 +00:00
zuul-worker	Fix ZUUL_USER_SSH_PUBLIC_KEY to support ssh key content	2018-04-23 23:24:04 +00:00
README.rst	Update doc to have 'debootstrap' dep and describe minimal	2016-10-12 19:27:05 -07:00
bindep-fallback.txt	Update bindep-fallback for openSUSE 15.0	2018-11-12 12:12:41 +01:00

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.