"We're committed to open-sourcing all of our cloud infrastructure, for the simple reason that we don't believe the cloud infrastructure is a competitive differentiator for us," says Todd Papaioannou, Yahoo's vice president of cloud architecture. "I have this question pop up from time to time, 'Is Yahoo ever going to move into the cloud?' And the answer is, 'No. We are the cloud.'"

Nonetheless, Yahoo's internal project could make deployment of its own Web properties more efficient and give enterprises and developers a free software platform to build their own clouds. Papaioannou says Yahoo's cloud will provide infrastructure-as-a-service along the lines of , but with a higher level of abstraction to make it easier for developers to build services.

The cloud-serving engine lets developers build services in containers that sit above the virtual-machine layer, letting developers quickly deploy that are up and running with a set of common services. It's somewhere between infrastructure-as-a-service and platform-as-a-service - offering, for example, a lower level of abstraction than that provided by the , a pure PaaS play.

Over the past 15 years Yahoo has had to become quite sophisticated in provisioning new services, Papaioannou says. But "sometimes sophistication becomes complexity, and we are trying to abstract that complexity away from our developers," he says.