OpenStack Architecture

This page exists to document OpenStack configuration.

Note that the current approach is to use devstack, which is not a good way to learn OpenStack. So much of this document will be about doing a devstack-like configuration for Funtoo.

This document will split OpenStack configuration into each architectural component, describing configuration steps for each component separately.

MySQL

glance

From glance.openstack.org:

The Glance project provides services for discovering, registering, and retrieving virtual machine images. Glance has a RESTful API that allows querying of VM image metadata as well as retrieval of the actual image.

Glance uses a MySQL database called glance.

SQL connection settings might be stored in a glance configuration file located at /opt/stack/glance/etc/glance-registry.conf. In the devstack installation process, /opt/stack/glance contains a git checkout of the glance software.

The SQL connection configuration string might look something like this:

sql_connection = mysql://glance:yourpassword@192.168.206.130/glance

More info on glance configuration is available here.

nova

Nova, the compute service, has its SQL connection specified in /etc/nova/nova.conf, using the --sql_connection=connection format. Connection string is identical to Glance. These are all SQLAlchemy connection strings :)