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With the advent of cloud computing, different cloud providers withheterogeneous cloud services (compute, storage, network, applications, etc.)and their related Application Programming Interfaces (APIs) have emerged. Thisheterogeneity complicates the implementation of an interoperable cloud system.Several standards have been proposed to address this challenge and provide aunified interface to cloud resources. The Open Cloud Computing Interface (OCCI)thereby focuses on the standardization of a common API forInfrastructure-as-a-Service (IaaS) providers while the Topology andOrchestration Specification for Cloud Applications (TOSCA) focuses on thestandardization of a template language to enable the proper definition of thetopology of cloud applications and their orchestrations on top of a cloudsystem. TOSCA thereby does not define how the application topologies arecreated on the cloud. Therefore, we analyse the conceptual similarities betweenthe two approaches and we study how we can integrate them to obtain a completestandard-based approach to manage both cloud infrastructure and cloudapplication layers. We propose an automated extensive mapping between theconcepts of the two standards and we provide TOSCA Studio, a model-driven toolchain for TOSCA that conforms to OCCI. TOSCA Studio allows to graphicallydesign cloud applications as well as to deploy and manage them at runtime usinga fully model-driven cloud orchestrator based on the two standards. Ourcontribution is validated by successfully designing and deploying three cloudapplications: WordPress, Node Cellar and Multi-Tier.

Model-Based Cloud Resource Management with TOSCA and OCCI