Interconnection of Federated Clouds

Cloud Federation is an emerging computing model where multiple resources from independent Cloud providers are leveraged to create large-scale distributed vir- tual computing clusters, operating as within a single Cloud organization. This model enables the implementation of environmental diversity for Cloud applications, and overcomes the provisioning and scalability limits of a single Cloud, by introducing minimal additional cost for the Cloud consumer. In such a scenario, it is necessary to leverage specific middleware technologies that enable the effective support of inter- Cloud communication services between Cloud providers. This paper proposes an interconnection solution for Cloud Federations based on publish-subscribe services.