Abstract
In the last few years, we witnessed a growing interest in interoperability and portability topics within the Cloud Computing area. In fact, most heterogeneous PaaS solutions have been developed with no standard APIs, and with different models and levels of service; in this scenario, vendor lock-in becomes an issue. Cloud4SOA project aims to design and develop a Reference Architecture that could solve interoperability and portability problems within the Cloud domain. This paper describes our work on Cloud4SOA Semantic and SOA layer presenting a common knowledge base framework and a standardized set of harmonized APIs to overcome diversities among PaaS solution and report interesting experimental results collected for two real-world PaaS deployments.
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