A big thanks goes out to my PhD supervisor, Dr. Mohamed, in KSA, my professional friend Belgacem in Tunisia for his guidance, critics, and my special colleagues at the company for sharing their knowledge at HiQInvest. I appreciate the encouragement provided by my new family in the Netherlands and the warmth they provided to make me feel at home. I would like to thank all the reviewers of this book for their accurate notes and precious remarks. I extend a special thank to Merwyn D'souza for his continued and great work on this book, which has been a big piece of work. I am grateful to William Sprakel, who has helped me dive into the cloud computing world and also Michiel Karnebeek and Rick Stokkingreef for sharing their knowledge. Of course, a big thank you to the OpenStack community for the wonderful work in making the cloud computing solution such a unique and wonderful experience.