DevStack

Overview DevStack from a cloud-height view

DevStack is not and has never been intended to be a general OpenStack installer. It has evolved to support a large number of configuration options and alternative platforms and support services. However, that evolution has grown well beyond what was originally intended and the majority of configuration combinations are rarely, if ever, tested. DevStack was never meant to be everything to everyone and can not continue in that direction.

Below is a list of what is specifically is supported (read that as "tested and assumed to work") going forward.

Supported Components

Base OS

The OpenStack Technical Committee (TC) has defined the current CI strategy to include the latest Ubuntu release and the latest RHEL release (for Python 2.6 testing).

  • Ubuntu: current LTS release plus current development release
  • Fedora: current release plus previous release
  • RHEL: current major release
  • Other OS platforms may continue to be included but the maintenance of those platforms shall not be assumed simply due to their presence. Having a listed point-of-contact for each additional OS will greatly increase its chance of being well-maintained.
  • Patches for Ubuntu and/or Fedora will not be held up due to side-effects on other OS platforms.

Databases

As packaged by the host OS

  • MySQL
  • PostgreSQL

Queues

As packaged by the host OS

  • Rabbit
  • Qpid

Web Server

As packaged by the host OS

  • Apache

OpenStack Network

Default to Nova Network, optionally use Neutron

  • Nova Network: FlatDHCP
  • Neutron: A basic configuration approximating the original FlatDHCP mode using linuxbridge or OpenVSwitch.

Services

The default services configured by DevStack are Identity (Keystone), Object Storage (Swift), Image Storage (Glance), Block Storage (Cinder), Compute (Nova), Network (Nova), Dashboard (Horizon)

Additional services not included directly in DevStack can be tied in to stack.sh using the plugin mechanism to call scripts that perform the configuration and startup of the service.

Node Configurations

  • single node
  • multi-node is not tested regularly by the core team, and even then only minimal configurations are reviewed

Exercises

The DevStack exercise scripts have been replaced as integration and gating test with Tempest. They will continue to be maintained as they are valuable as demonstrations of using OpenStack from the command line and for quick operational testing.