  The increase of astronomical data produced by a new generation of
observational tools poses the need to distribute data and to bring computation
close to the data. Trying to answer this need, we set up a federated data and
computing infrastructure involving an international cloud facility, EGI
federated, and a set of services implementing IVOA standards and
recommendations for authentication, data sharing and resource access. In this
paper we describe technical problems faced, specifically we show the designing,
technological and architectural solutions adopted. We depict our technological
overall solution to bring data close to computation resources. Besides the
adopted solutions, we propose some points for an open discussion on
authentication and authorization mechanisms.
