Using cloudlets and multipath TCP for seamless virtual machine migration

为了提高实时资源密集型移动应用的性能，提出了一种基于邻近虚拟机（VM）的移动云计算（MCC）。当移动设备发现附近有云环境后，需要在云环境中搭建虚拟机，然后才会开始从移动设备向虚拟机卸载数据。从发现cloudlet到实际卸载数据之间的时间被视为服务初始化时间。当多个cloudlet出现在附近的地理位置时，使用每个cloudlet启动服务可能会让cloudlet用户在更改位置时感到沮丧。为了消除从源云迁移后服务启动时间造成的延迟，本研究提出了相邻云之间的无缝实时虚拟机迁移。无缝的实时虚拟机迁移是通过预先了解目标云中的迁移虚拟机IP地址实现的，更重要的是使用多路径TCP （MPTCP）。我们将使用Linux KVM管理程序执行许多实验来验证所提出的方法。实验结果将证明该方法的可行性，并显示出性能的改进。具体来说，在迁移完成后，目标cloudlet的停机时间将为零。

A nearby virtual machine (VM) based cloudlets have been proposed for mobile cloud computing (MCC) to enhance the performance of real-time resource-intensive mobile applications. After a mobile device (MD) discovers a cloudlet in the vicinity, it takes time to set up a virtual machine (VM) inside the cloudlet before data offloading from the MD to the VM starts. The time between discovering the cloudlet and actual offloading of data is considered as a service initiation time. When multiple cloudlets are presented in a nearby geographical location, initiating a service with each cloudlet may be frustrating for cloudlet users when changing location. In order to eliminate the delay caused by the service initiation time after moving away from the source cloudlet, this research is proposing a seamless live VM migration between neighbour cloudlets. A seamless live VM migration is achieved with the prior knowledge of the migrating VM IP address in the destination cloudlet and more importantly with multipath TCP (MPTCP). We will perform a number of experiments to validate the proposed approach using the Linux KVM hypervisor. The experimental results will demonstrate the feasibility of the proposed approach and also show performance improvement. Specifically, there will be zero downtime at the destination cloudlet after the migration is completed.