A method, apparatus, and computer instructions are provided for classifying and modeling operating system images for data center management. An operating system image may be classified as a golden master image, a snapshot image, or a scripted operating system image. A software model is provided to abstract operating system and platform detail, and provide a consistent and scalable way of dealing with operating system images. An installation mechanism is provided to install images based on priorities. Software installables are attached with a software definition that may either be a software stack or a software module. A software stack comprises at least one software module.