DevStack is a set of scripts and utilities to quickly deploy an OpenStack cloud.

• To quickly build dev OpenStack environments in a clean Ubuntu or Fedora environment
• To describe working configurations of OpenStack (which code branches work together? what do config files look like for those branches?)
• To make it easier for developers to dive into OpenStack so that they can productively contribute without having to understand every part of the system at once
• To make it easy to prototype cross-project features
• To provide an environment for the OpenStack CI testing on every commit to the projects

Read more at http://devstack.org.

IMPORTANT: Be sure to carefully read stack.sh and any other scripts you execute before you run them, as they install software and will alter your networking configuration. We strongly recommend that you run stack.sh in a clean and disposable vm when you are first getting started.

The DevStack master branch generally points to trunk versions of OpenStack components. For older, stable versions, look for branches named stable/[release] in the DevStack repo. For example, you can do the following to create a grizzly OpenStack cloud:

git checkout stable/grizzly
./stack.sh

You can also pick specific OpenStack project releases by setting the appropriate *_BRANCH variables in the localrc section of local.conf (look in stackrc for the default set). Usually just before a release there will be milestone-proposed branches that need to be tested::

GLANCE_REPO=git://git.openstack.org/openstack/glance.git
GLANCE_BRANCH=milestone-proposed