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 Install diskimage-builder: :: sudo -H pip install diskimage-builder Build an image -------------- Building an image is simple, we have a script! :: DISTRO="ubuntu" bash tools/build-image.sh See the script for environment variables to set distribution, etc. You should be left with a .qcow2 image file of your selected distribution. 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.