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The maturity of the Cloud Computing paradigm has highlighted a set of obstacles which isolated cloud providers are not being able to handle. To overcome these obstacles, isolated providers can organize themselves in entities called Inter-Clouds, mainly to share resources. However, this kind of resource-sharing environment may face the emergence of free riders, which only consume resources without caring for the whole, in a modern version of the Tragedy of the Commons. This work characterizes the free riders and proposes an Inter-Cloud architecture to avoid them based on the main features of Cloud Federations. This Inter-Cloud architecture, called Multi-Clouds Tournament, organizes multiple cloud providers in a tournament-based fashion, allowing those with better scores, determined by a function offferandconsumption , to take advantage of the system. On the other hand, those with low expected returns to the system, free riders for example, face disadvantages or even are eliminated from the tournament. We show preliminary tests of a score function within the tournament, illustrating how the system promotes or eliminates participants according to their behavior.

Avoiding Free Riders in the Cloud Federation Highways