devstack/README.md
Ian Wienand a35391e3bb Talk about local.conf first
We bury the lead with all the historical notes about localrc; just
talk about what is important to somebody setting up a current
devstack, which is local.conf.

There are already inline examples of config-variables, etc.  Remove
them, but add a small overview example for logging in its place.

Change-Id: I466252ffba66ef4ea180c9355f715a19eb4f8017
2015-08-27 15:19:31 +10:00

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Markdown

DevStack is a set of scripts and utilities to quickly deploy an OpenStack cloud.
# Goals
* 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.
# Versions
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 juno OpenStack cloud:
git checkout stable/juno
./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
# Start A Dev Cloud
Installing in a dedicated disposable VM is safer than installing on your
dev machine! Plus you can pick one of the supported Linux distros for
your VM. To start a dev cloud run the following NOT AS ROOT (see
**DevStack Execution Environment** below for more on user accounts):
./stack.sh
When the script finishes executing, you should be able to access OpenStack
endpoints, like so:
* Horizon: http://myhost/
* Keystone: http://myhost:5000/v2.0/
We also provide an environment file that you can use to interact with your
cloud via CLI:
# source openrc file to load your environment with OpenStack CLI creds
. openrc
# list instances
nova list
If the EC2 API is your cup-o-tea, you can create credentials and use euca2ools:
# source eucarc to generate EC2 credentials and set up the environment
. eucarc
# list instances using ec2 api
euca-describe-instances
# DevStack Execution Environment
DevStack runs rampant over the system it runs on, installing things and
uninstalling other things. Running this on a system you care about is a recipe
for disappointment, or worse. Alas, we're all in the virtualization business
here, so run it in a VM. And take advantage of the snapshot capabilities
of your hypervisor of choice to reduce testing cycle times. You might even save
enough time to write one more feature before the next feature freeze...
``stack.sh`` needs to have root access for a lot of tasks, but uses
``sudo`` for all of those tasks. However, it needs to be not-root for
most of its work and for all of the OpenStack services. ``stack.sh``
specifically does not run if started as root.
DevStack will not automatically create the user, but provides a helper
script in ``tools/create-stack-user.sh``. Run that (as root!) or just
check it out to see what DevStack's expectations are for the account
it runs under. Many people simply use their usual login (the default
'ubuntu' login on a UEC image for example).
# Customizing
DevStack can be extensively configured via the configuration file
`local.conf`. It is likely that you will need to provide and modify
this file if you want anything other than the most basic setup. Start
by reading the [configuration guide](doc/source/configuration.rst) for
details of the configuration file and the many available options.