History

Tristan Cacqueray 66cb2317fd infra-package-needs: add support for centos-8-stream This change fix the centos version check to work with both '8' and '8-stream' value for DIB_RELEASE. The current test is failing with: $ export DIB_RELEASE=8-stream $ set -u $ [[ $DIB_RELEASE -gt 8 ]] bash: stream: unbound variable The fix is lifted from https://review.opendev.org/#/c/734083/14/diskimage_builder/elements/simple-init/environment.d/15-simple-init-networkmanager Change-Id: I23dca12eef1c3cc2aacf6ac50029e2bc9fde72dc		2020-10-02 18:19:07 +00:00
..
cache-devstack	Cache cirros UEC images	2020-04-23 16:43:43 +02:00
control-plane-minimal	Fix new dib-lint errors	2020-03-11 10:10:57 +11:00
infra-package-needs	infra-package-needs: add support for centos-8-stream	2020-10-02 18:19:07 +00:00
initialize-urandom	Fix flake8	2017-10-21 18:37:10 +02:00
nodepool-base	Revert "Pin setuptools<50 in our image venvs"	2020-09-03 09:19:52 -07:00
openstack-repos	Stop to use the __future__ module.	2020-06-02 20:44:50 +02:00
zuul-worker	zuul-worker: remove python-apt & libselinux deps	2020-04-03 09:20:05 -05:00
README.rst	Update doc to have 'debootstrap' dep and describe minimal	2016-10-12 19:27:05 -07:00
bindep-fallback.txt	Remove references to OpenSUSE 423	2019-10-14 09:14:08 -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.