Cloud gaming is a new paradigm that allows users to play games in the cloud and stream them to a thin client. While there is little research about cloud gaming, containerization technologies such as Docker could provide a virtualization alternative to Virtual Machines, as these suffer from overhead and GPU pass-through constraints. With Rapture, we provide an efficient cloud gaming platform based on containerization. Stable GPU multi-tenancy is achieved by resource restrictions such as frame rate and resolution limiting. A resource-aware best-fit scheduling algorithm accomplishes workload placement in the cloud gaming cluster. The best-fit algorithm outperforms other scheduling algorithms in node utilization and preservation of Quality of Experience. Furthermore, Checkpoint and Restore technologies enable migration, maintaining a high node utilization when down-scaling services. While migration improves efficiency, Quality of Experience is affected.