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Abstract.We present the open reference architecture of the SeaClouds solution. It aims at enabling a seamless adaptive multi-cloud management of complex applications by supporting the distribution, monitoring and reconfiguration of app modules over heterogeneous cloud providers. Motivation and Objectives of SeaCloudsCloud computing is a model for enabling convenient and on-demand network access to a shared pool of configurable computing resources that can be rapidly provisioned and released with minimal management effort or service provider interaction. Many private and public clouds have emerged during the last years, offering a range of different services at SaaS, PaaS levels aimed at matching different user requirements. Current cloud technologies suffer from a lack of standardization, with different providers offering similar resources in a different manner, which results in the vendor lock-in problem. This problem affects all stages of the cloud applications' lifecycle, ranging from their design to their operation. Application developers must know the features of the services to be used, and have a deep knowledge of the providers' API. To reduce the need of using deep knowledge, we can find solutions based on the use of standards, such as OASIS CAMP or OASIS TOSCA , DMTF CIMI , unified APIs, such as jClouds 5 , or solutions like Docker 6 . These solutions are indeed very different, for example, whereas jClouds provides a cloud agnostic API library to provision and configure secure communications with cloud virtual machines, container-based solutions like Docker allow describing and deploying applications and their dependencies through containers on machines with the corresponding engine. Furthermore, different vendors (e.g., Dell, BMC, Abiquo) are currently commercialising tools for This work has been partly supported by the EU-FP7-ICT-610531 SeaClouds project. 5 https://jclouds.apache.org 6 https://www.docker.com

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