Next revision of OCCI becomes proposed recommendation!

Posted October 31st, 2016 in News by admin

We are very happy to announce that the updated revision of the OCCI documents series has been published by OGF.  All OGF documents may be found here:

Here is the complete document list:

  • GFD.221.pdf – Open Cloud Computing Interface – Core
  • GFD.222.pdf – OCCI Compute Resource Templates Profile
  • GFD.223.pdf – Open Cloud Computing Interface – HTTP Protocol
  • GFD.224.pdf – Open Cloud Computing Interface – Infrastructure
  • GFD.226.pdf – Open Cloud Computing Interface – JSON Rendering
  • GFD.227.pdf – Open Cloud Computing Interface – Platform
  • GFD.228.pdf – Open Cloud Computing Interface – Service Level Agreements
  • GFD.229.pdf – Open Cloud Computing Interface – Text Rendering

Big thanks to everybody who helped shaping these documents! This is another good step towards an open interoperable cloud language.

[Update – 2016/12/20] Fixed permanent links to the PDF documents.

OCCI visualization

Posted March 18th, 2016 in Implementations by admin


This is a general purpose visualization tool for OCCI Entity instances. OCCI Resource entities are visualized as points on a round wheel, while the Link entities connecting the Resources are depicted as colorful lines between them. For more info see:

ooi: OpenStack OCCI Interface

Posted March 18th, 2016 in Implementations by admin


The EU funded projects EGI-Engage and INDIGO-Datacloud have come up with an OCCI interface leveraging the public OpenStack APIs: ooi

OCCI 1.2

Posted March 17th, 2016 in News by admin

We are very happy to announce, that thanks to a lot of help from the community, the documents which will become OCCI rev 1.2 are ready:

  • Our core document has been update with minor tweaks. [pdf]
  • We’ve update the Text rendering document – propose however that this will be deprecated over time. [pdf]
  • As a substitute to the Text rendering we now suggest using JSON. [pdf]
  • To allow for the deprecation of the Text rendering, and addition of the JSON rendering we’ve moved the generic protocols pieces to this new recommendation. [pdf]
  • We’ve captured some minor tweaks in the Infrastructure document. [pdf]
  • A new addition is the support for machine readable SLA. [pdf]
  • Furthermore OCCI now also support PaaS/CaaS. [pdf]
  • We’re very happy to announce a profile for OCCI. [pdf]

The OCCI revision 1.1 documents can still be found on the Specification page.

OCCI 1.2 revision in public comment

Posted May 4th, 2015 in News by admin

Thanks to the help of many helpers a set of documents describing OCCI revision 1.2 is now in public comment. Similar to IETF OGF uses a very open policy – so this is the point in time where we need your help. Please read the docs and provide us with comments and suggestions.

OCCI 1.2 targets to be backwards compatible with OCCI rev 1.1. An overall of 9 documents is now ready for your comments at the OGF website.

The 9 documents are:

  • A updated core model – which includes minor updates and e.g. refinements about the usage of Attributes in the Meta-model.
  • A updated Infrastructure model – which minor tweaks on the state models of the kind descriptions
  • The HTTP text rendering document has been split:
    • in a protocol definition defining how OCCI is RESTfully modeled over HTTP, and
    • a text rendering document containing the text rendering
  • A newly defined JSON rendering based on the new protocol document
  • A newly defined extension to render Service Level Agreements
  • A newly defined extension to deal with Platform as a Service Service Providers over OCCI
  • A Profile which is a recommendation driven by the EGI project.
  • and last – but definitely not least – and informal document describing how OCCI can be used to Monitor resources.

Again – many thanks to those who helped to achieve this milestone. And already many thanks in advance to the community for helping forming OCCI 1.2 through this public comment phase.

OGF42 Updates from the Group

Posted September 15th, 2014 in News by admin

The OCCI working group has been quite busy in the past months to work on new revision of the OCCI specs. This has lead to contributions from multiple individuals at the OGF 42 event in London, which was held at the Imperial College. Four sessions in total and with plenty of coffee in between guided the attendees through no less then 9 PDF document drafts which were discussed. Alongside this there were a number of demos.

With this blog post we like to inform you that the upcoming revision of the OCCI specs will be a backward compatible update adding some features to the specification. Some of these will be:

  • Updates to the core model specification for readability alongside with the introduction of the OCCI Attribute type which now allows for types and default values of attributes
  • A split of the current HTTP text rendering document into a HTTP Protocol and a Text Rendering document. Also Sub-resources within the HTTP protocol will be introduced
  • Updates of the infrastructure specification document which update state models for the resource instances
  • JSON Rendering specification which can be used alongside with the Text Rendering
  • PaaS specification which allows for management of PaaS cloud resource
  • SLA extension for handling SLA of your cloud resources
  • DRMAA binding which will allow job job submission via a RESTful OCCI compliant interface
  • Drafts on Monitoring and Billing extensions for OCCI.
  • Minor additions of useful features in any of the above specifications

We as a group are thrilled about the ongoings and wild usage of OCCI and hope these changes will make your work with OCCI more satisfying. Again thanks to the individuals in the community which made this round of revision possible.

OCCI & Erlang

Posted January 24th, 2014 in Implementations by admin


erOCCI is a framework for building OCCI like API (similar to rOCCI or pyOCNI), with the following objectives:

  • 100% compliance with OCCI specifications (core and rendering)
  • scalability
  • clear separation between
    • rendering: text/occi, text/plain, application/occi+json, etc.
    • transport: HTTP, etc (XMPP planned)
    • backends: storage (Riak, etc.), “procci” to other APIs
  • small and heavily tested (planned.. but some unit tests already there)

OCCI in CloudStack

Posted November 5th, 2013 in Implementations by admin


CloudStack now has an OCCI implementation! The implementation is an extension to rOCCI and has been provided by @isaacchiang.

OCCI OpenStack Now On Stackforge

Posted June 6th, 2013 in News by admin

Stackforge is the place where all OpenStack related projects can find a common home. The OpenStack OCCI implementation has now moved to stackforge infrastructure and can now be found here.

OCCI Presented at the Future Internet Assembly

Posted May 10th, 2013 in News by admin

The ICCLab presented on the latest developments (PDF) in the Open Cloud Computing Interface at the Future Internet Assembly in Dublin. The session was organised by Cloud4SOA and the main theme was MultiCloud. In this regard, OCCI figures in many projects striving from this including EGI FedCloud, CompatibleOne and BonFire. In the presentation some future points of work that will be carried out in Mobile Cloud Networking, which took the audience’s interest.

Kindly reposted from the ICCLab