Ian Wienand f5c3bd5dad Initial centos7 support for build-image.sh

Add some filtering to 55-cache-devsatck-repos to handle centos7, which
actually gets setup with a DISTRO_NAME of rhel7 in devstack

Update the readme file to highlight the options for building other
images.

"DISTRO=centos7 ./tools/build-image.sh" creates a workable centos7
qcow image with this change and a d-i-b that includes
Ie24033468b78587ea87188ee1b843b26895798ff

Change-Id: Ida38cba0a303ab77432d5d354f1952e00ebfa00e

2014-10-07 10:21:00 -07:00

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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 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.

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 devstack-gate-precise.qcow2
sudo mount /dev/nbd1 /tmp/newimage

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.

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