Introduction to Cloud Computing

摘要: When plugging an electric appliance into outlet, we care neither how power is generated nor it gets to that outlet. This possible because electricity virtualized; is, readily available from a wall socket hides generation stations and huge distribution grid. extended information technologies, this concept means delivering useful functions while hiding their internals work. Computing itself, be considered fully virtualized, must allow computers built distributed components such as processing, storage, data, software resources [1]. Technologies cluster, grid, now, cloud computing, have all aimed at allowing access large amounts of computing in virtualized manner, by aggregating offering single system view. In addition, important aim these technologies has been utility. Utility describes business model for on-demand delivery power; consumers pay providers based on usage (“payas-you-go”), similar the way which currently obtain services traditional public utility water, electricity, gas, telephony. Cloud coined umbrella term describe category sophisticated initially offered commercial providers, Amazon, Google, Microsoft. It denotes infrastructure viewed “cloud,” businesses individuals applications anywhere world demand [2]. The main principle behind “as service.”