The paper describes on-going work on a configurable network based experimental platform ReSeLa. The platform is a key component of the ongoing EU funded TEMPUS project ENGENSEC. The project is aiming at providing courses and training material to educate future generation of Cyber security experts. Our project is based on the educational Framework; Conceive, Design, Implement, Operate (CDIO1). The paper outlines the background of earlier efforts on similar platforms in Sweden and Latvia. In the paper we also compares our approach with lessons learned in international projects such as PlanetLab, EmuLab, and GENI. Our approach of Cloud based environments is based on recent advanced in distributed computing such as OpenStack. Some identified and addressed challenges care presented. We also present the architecture of ReSeLa as well as its basic functionalities. The paper ends with a section on Future work and a short list of references