Configuration of services based on virtualization

Virtualization is fundamental to cloud computing. It allows abstraction centred on services and isolation of lower level functionalities and underlying hardware. Modeling, analyzing and verifying cloud systems necessarily involve virtualization and services. However, there exist few efforts to effectively formalizing virtualization in cloud computing. In this paper, based on services we present an approach for defining virtualization. We discuss some properties of service virtualization under some operations and the correctness of virtual services (virtual services without abnormal behavioral problems). Moreover, we investigate automatic configuration of a service based on virtualization, that is, given a virtualized service, how can we automatically obtain all possible correct virtual services of such a service? The configuration process is to first separate a virtualized service into atomic and correct virtual services and then merge these atomic virtual services into all possible correct virtual services of such a virtualized service. The obtained theoretical results help to formally analyze, verify and configure cloud systems.