随着虚拟化、分布式存储、网格计算、高速网络,以及自动管理等技术的发展,云计算作为一种新型的计算模式迅速从概念走向应用。简单地说,云计算就是以规模庞大的服务器集群、超大容量存储设备和网络带宽等资源为基础,根据用户需求进行动态资源分配而提供的一种信息服务。云计算的超大规模、虚拟化、多用户、高可靠性、高可扩展性、按需服务、价格低廉等特点对人们的工作、生活方 With the development of technologies such as virtualization, distributed storage, grid computing, high-speed network, and automatic management, cloud computing has rapidly moved from concept to application as a new type of computing model. Simply put, cloud computing is based on large-scale server clusters, large storage devices and network bandwidth resources, based on user needs dynamic resource allocation and provide an information service. Cloud computing, large-scale, virtualization, multi-user, high reliability, high scalability, on-demand services, low prices and other characteristics of people’s work, life