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PROOF, the Parallel ROOT Facility, is a ROOT-based framework which enablesinteractive parallelism for event-based tasks on a cluster of computing nodes.Although PROOF can be used simply from within a ROOT session with no additionalrequirements, deploying and configuring a PROOF cluster used to be not asstraightforward. Recently great efforts have been spent to make theprovisioning of generic PROOF analysis facilities with zero configuration, withthe added advantages of positively affecting both stability and scalability,making the deployment operations feasible even for the end user. Since agrowing amount of large-scale computing resources are nowadays made availableby Cloud providers in a virtualized form, we have developed the VirtualPROOF-based Analysis Facility: a cluster appliance combining the solid CernVMecosystem and PoD (PROOF on Demand), ready to be deployed on the Cloud andleveraging some peculiar Cloud features such as elasticity. We will show howthis approach is effective both for sysadmins, who will have little or noconfiguration to do to run it on their Clouds, and for the end users, who areultimately in full control of their PROOF cluster and can even easily restartit by themselves in the unfortunate event of a major failure. We will also showhow elasticity leads to a more optimal and uniform usage of Cloud resources.

PROOF as a Service on the Cloud: a Virtual Analysis Facility based on the CernVM ecosystem