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Difference between revisions of "Graffiti"

(Juno Summit Design Sessioɲ)
(Usage Concepts)
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=== Usage Concepts ===
=== Usage Concepts ===
# Load your metadata definitions (called property types or capability types)
# Load your metadata definitions (called capabilities and tags)
## Into the Graffiti central dictionary
## Into the central metadata catalog
## Or configure Graffiti plugins to include existing definitions provided by the various services
# Update the resources in the cloud with your tags and capabilities
# "Tag" the resources in the cloud with your properties and capabilities
# Let users find the resources with your desired tags and capabilities
# Let users find the resources with your desired properties and capabilities
=== Frequently Asked Questions ===
=== Frequently Asked Questions ===

Revision as of 22:37, 4 June 2014

What's in my cloud?

I've got a lot of resources in my cloud.

  • How do I find what I need?
  • How do I describe what I have?

At its most basic concept, Graffiti's intent is to enable better metadata collaboration across services and projects for OpenStack users. Graffiti has the initial intent of providing cross service metadata “tagging" and search aggregation for cloud resources.


A challenge we've experienced with using OpenStack is discovering, sharing, and correlating metadata across services and different types of resources. We believe this affects both end users and administrators.

For end users, we feel like doing basic tasks like launching instances is too technical for end users and require too much pre-existing knowledge of OpenStack concepts. For example, you should be able to just specify categories like "Big Data" or an "OS Family" and then let the system find the boot source for you, whether that is an image, snapshot, or volume. It should also allow finer grained filtering like filtering on specific versions of software that you want.

For administrators, we’d like there to be an easier way to meaningfully collaborate on properties across host aggregates, flavors, images, volumes, or other cloud resources.

Various OpenStack services provide techniques to abstract low level resource selection to one level higher, such as flavors, volume types, or artifact types. These resource abstractions often allow "metadata" in terms of key-value pair properties to further specialize and describe instances of each resource type. However, collaborating on those properties can be a disconnected and difficult process. This often involves searching wikis and opening the source code. In addition, the metadata properties often need to be correlated across several different services. It becomes more difficult as a cloud's scale grows and the number of resources being managed increases.

We, HP and Intel, believe that both of the above problems come back to needing a better way for users to collaborate on metadata across services and resource types. We started a project called Graffiti to explore ideas and concepts for how to make this easier and more approachable for end users. Please join with us to help move forward together as a community!

We believe that we can make some immediate improvements in Horizon, but that they can't be achieved through Horizon alone and that the benefits should extend to the API and CLI interactions as well. Better cross service collaboration and consistency on metadata should provide benefits that can be leveraged by other projects such as scheduling, reservation, orchestration, and policy enforcement.

Terminology Note

We think the term "metadata" is a somewhat unapproachable term, so we have been exploring with the concept of a "capability". A capability can simply be thought of as a named "tag" which may or may not have properties. The idea is that a user can simply "tag" a capability onto various cloud resources such as images, volumes, host aggregates, flavors, and so on. To the end user, the exact mechanism for how the data is stored is handled for them.


To help explain the ideas of the project, we have a quick screencast demonstrating the concepts running under POC code. Please take a look!

Usage Concepts

  1. Load your metadata definitions (called capabilities and tags)
    1. Into the central metadata catalog
  2. Update the resources in the cloud with your tags and capabilities
  3. Let users find the resources with your desired tags and capabilities

Frequently Asked Questions

Please see our Graffiti/FAQ for answers to common questions.

Design Concepts

Additional architecture concepts on the Architecture page.


We are working on a concepts with Horizon that cross Nova, Glance, and Cinder. We are using the POC to help us better understand technical issues and will use that knowledge to help contribute to existing projects and to build out the Graffiti concepts appropriately.

The Graffiti project currently has the following aspects that we're exploring:

  • Immediate improvements in Horizon which don't necessarily require changes to existing services, but will have some inherent limitations.
  • Central collaboration APIs without the limitations of a Horizon only solution
    • With the intent of also enhancing existing services as needed through participating in existing working in the community and creating new blueprints where needed

We will be at the summit with a demo of the POC (in whatever state it is) and have a scheduled design session where we'd love to discuss with the community where Graffiti can best fit in to the ecosystem and how it may relate to other projects and use cases.

Related Blueprints

Assigned or Filedː

Get Involved

Please join with us to help move forward together as a community! We are sure that the ideas and concepts can use refinement and we'd like to identify where we can best fit in to the ecosystem. We have picked up and also have filed a few Horizon blueprints, but to accomplish the desired outcomes this will require work on other projects as well as possibly incubating the Graffiti service concepts under an existing program. Your insight and feedback is important to us and we look forward to growing this initiative with you!

We have a design session at the summit where we'd love to have open discussion with all who can attend:

Juno Summit Design Sessioɲ

POC Demo reviewː ̽ * https://www.youtube.com/watch?v=Dhrthnq1bnw



The developers use IRC in #graffiti on Freenode for development discussion.