Sommelier: a tool for validating TOSCA application topologies

TOSCA is an OASIS standard for specifying cloud applications and automating their management. The topology of a cloud application can be described as a typed and directed graph. The latter can then be automatically processed by so-called TOSCA engines to automate the deployment and management of the described application on cloud platforms. In this paper we first illustrate the conditions ensuring the validity of a TOSCA application topology. We then introduce Sommelier, an open-source validator of TOSCA application topologies based on such validity conditions.