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An image is a collection of software that is installed on an operating system. For the most part, these images can be deployed, used, modified, and saved (captured). However, there are some cases where only some of the operations could be proformed on an image. For example, an image could exist that could be deployed and used, but not saved, or another image may exist that can can have access to it brokered by VCL, but it cannot be deployed or saved. VCL provides a way to assign other images to be "subimages" of an image to create an environment (or cluster). Images can be designed to run directly on a computer (bare metal) or under a hypervisor (virtualized images). Currently, VCL uses xCAT as the provisioning engine to manage bare metal images. Various versions of VMWare can be used to provision virtualized images. The VCL backend code (vcld) is sturctured in a modularized way such that it is easy to add support for other provisioning technologies. We plan on adding support for other hypervisor technologies in the near future.

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