what is cloud service? \xd\\xd\ Let me give you a simple description: it is smart enough to predict your needs in real time according to your location, time, preferences and other information. In this brand-new mode, information search will be done for you, not for you. No matter what equipment you use, no matter what kind of on-demand service you need, you will get a consistent and coherent ultimate experience. \xd\\xd\ provides rich personalized products by breeding a large number of startups to meet the expanding personalized demand in the market. Its breeding method is to provide a complete set of services such as capital, promotion, payment, logistics and customer service for start-up companies, and let their own operating capabilities be used externally as needed like water and electricity. This is the business model of cloud services. \xd\\xd\ Cloud service was born on the premise that the Internet broke the geographical division to form a unified market, and it became profitable to provide products for individual needs. Its objective effect is: the cost of starting a business is minimized, entrepreneurs only focus on the core links such as creativity, and operation and management will no longer be important. Small companies began to challenge big companies and subvert the industrial civilization of "winning by scale". Our society and culture will be more independent and free. \ xd \ xd \ cloud terminal \ xd \ xd \ The next generation PC is called "cloud terminal". It doesn't need a central processing unit, a hard disk, a graphics card, or even an operating system and application software, because all the above functions are completed by a public cloud server, which is just a small set-top box or directly built into a display. "The price is only 5 yuan." \ xd \ xd \ cloud terminal is by far the most economical computer network solution, and the price of a single computer is only a few hundred yuan. According to statistics, compared with the traditional PC system, the cloud terminal system will save 7% investment in the procurement process; In the system operation and maintenance link, the cost burden will be reduced by 9%; In terms of use cost, 5 cloud terminals are equivalent to the power consumption of an ordinary PC, which saves considerable electricity. \ xd \ xd \ cloud computing "will change the current computer" chassis+monitor "mode. In the future, TVs, mobile phones and game consoles may become the end devices of the network. Computers are so ubiquitous that we can't see them. This is ubiquitous computing. With the maturity of the concept of cloud computing, telecom operators, hardware suppliers and software service providers are integrated. In the past, the dominant position of operating system and processor platform will decline in the traditional PC industry, and PC manufacturers will have more voice and development opportunities. \xd\\xd\ Cloud computing is a new method of * * * sharing infrastructure, which can connect huge system pools together to provide various IT services. Many factors have driven the demand for this kind of environment, including the adoption of connected devices, real-time data streams, SOA and the rapid growth of Web2. applications such as search, open collaboration, social networks and mobile commerce. In addition, the improvement of the performance of digital components also greatly increases the scale of IT environment, thus further strengthening the demand for a unified cloud management. \xd\\xd\ cloud computing-Defining cloud computing In a narrow sense, cloud computing refers to the delivery and use mode of IT infrastructure, which refers to obtaining the required resources (hardware, platform, software) in an on-demand and scalable way through the network. A network that provides resources is called a "cloud". The resources in the "cloud" can be infinitely expanded by users, and can be obtained at any time, used on demand, expanded at any time, and paid according to use. This feature is often referred to as using IT infrastructure like hydropower. \xd\\xd\ Cloud computing in a broad sense refers to the service delivery and usage mode, and refers to obtaining the required services in an on-demand and extensible way through the network. This service can be related to IT, software and Internet, or any other service. \ xd \ xd \ Cloud computing is often confused with Parallel Computing, Distributed Computing and Grid Computing. Cloud computing is the result of the mixed evolution and leap of the concepts of Virtualization, Utility Computing, IaaS (Infrastructure as a Service), PaaS (Platform as a Service) and SaaS (Software as a Service). \xd\\xd\ cloud computing-features \xd\(1) Very large scale. The "cloud" has a considerable scale. Google cloud computing has more than 1 million servers, and Amazon, IBM, Microsoft, Yahoo and other "clouds" have hundreds of thousands of servers. Enterprise private clouds generally have hundreds of servers. "Cloud" can give users unprecedented computing power. \xd\\xd\(2) Virtualization. Cloud computing supports users to obtain application services at any location and using various terminals. The requested resources come from the "cloud" rather than a fixed tangible entity. The application runs somewhere in the "cloud", but in fact, users don't need to know or worry about the specific location where the application runs. All we need is a notebook or a mobile phone, and we can achieve everything we need through network services, even such tasks as supercomputing. \ xd \ xd \ cloud computing (3) high reliability. "Cloud" uses measures such as fault tolerance of multiple copies of data and isomorphism and interchangeability of computing nodes to ensure high reliability of services. It is more reliable to use cloud computing than to use local computers. \xd\\xd\(4) universality. Cloud computing is not specific to a specific application. With the support of "cloud", ever-changing applications can be constructed, and the same "cloud" can support different applications at the same time. \xd\\xd\(5) High scalability. The scale of the "cloud" can be dynamically scaled to meet the needs of the growth of applications and users. \xd\\xd\(6) On-demand service. "Cloud" is a huge pool of resources, which you can buy on demand; Cloud can be charged like tap water, electricity and gas. \ xd \ xd \ (7) is extremely cheap. Because the special fault-tolerant measures of "cloud" can use extremely cheap nodes to form a cloud, the automatic centralized management of "cloud" makes a large number of enterprises not have to bear the increasingly high cost of data center management, and the universality of "cloud" greatly improves the utilization rate of resources compared with the traditional system, so users can fully enjoy the low-cost advantage of "cloud", and often it takes only a few hundred dollars and a few days to complete tasks that used to take tens of thousands of dollars and months to complete. \xd\\xd\ Cloud Computing-cloud computing is a new business computing model. It distributes computing tasks on a resource pool composed of a large number of computers, so that various application systems can obtain computing power, storage space and various software services as needed. \xd\ This resource pool is called "cloud". "Cloud" is some virtual computing resources that can be self-maintained and managed, usually some large server clusters, including computing servers, storage servers, broadband resources and so on. Cloud computing concentrates all computing resources and is managed automatically by software without human intervention. This enables application providers to focus more on their own business without worrying about complicated details, which is conducive to innovation and cost reduction. \ xd \ xd \ is called "cloud" because it has the characteristics of real clouds in some aspects: clouds are generally large; The scale of cloud can scale dynamically, and its boundary is fuzzy; The cloud is erratic in the air, and you can't and don't need to determine its specific location, but it does exist somewhere. \ xd \ xd \ is also called "cloud" because Amazon, one of the founders of cloud computing, has adopted a new name "Elastic Computing Cloud" (EC2) for what was once known as grid computing, and has achieved commercial success. Cloud computing is regarded as a "revolutionary computing model" by its touts, because it makes it possible for supercomputing power to circulate freely through the Internet. Enterprises and individual users no longer need to invest in expensive hardware acquisition costs, but only need to purchase rental computing power through the Internet. "Take your computer as an access port and leave everything to the Internet." Users only need 64K of memory. "Bill Gates said in 1989 when talking about" the past, present and future tense of computer science ". At that time, all the programs were very small, and the 1MB hard disk was almost inexhaustible. Internet is still being developed in the laboratory, and hypertext protocol has just been put forward. Their wide application will begin in six years. At present (in 28), such information can be retrieved on the website that provides installation services. The standard of a computer required by an ordinary white-collar worker is: low-end Core Dual-Core /1GB memory /1GB hard disk. Soon, megabit hard disk will enter the use range of home computers. Behind the rapid development of hardware configuration is the rapid growth of data on the Internet, which is simply challenging the limits of human imagination. When massive data was put forward as a concept, the unit was GB. Now this is just a unit of data for a small website. \ xd \ xd \ Cloud Computing-basic principles kai-fu lee cloud computing is the development of Distributed Computing, Parallel Computing and Grid Computing, or the commercial realization of these computer science concepts. \xd\\xd\ The basic principle of cloud computing is that the operation of enterprise data centers will be more similar to the Internet by distributing computing on a large number of distributed computers instead of local computers or remote servers. This enables enterprises to switch resources to needed applications and access computers and storage systems as required. This is a revolutionary measure, for example, it is like changing from the old single generator mode to the centralized power supply mode of power plants. It means that computing power can also be circulated as a commodity, just like gas and water and electricity, with convenient access and low cost. The biggest difference is that it is transmitted through the Internet. The blueprint of cloud computing has come to the fore: in the future, all we need, even such tasks as supercomputing, can be realized through network services with only a notebook or a mobile phone. From this perspective, the end user is the real owner of cloud computing. The application of cloud computing contains the idea of uniting forces for each member. In the most fundamental sense, cloud computing is the ability to use software and data on the Internet. For cloud computing, Kai-Fu Lee (global vice president of Google and president of China) made an image metaphor: Qianzhuang. At first, people just put money under their pillows. Later, there was a bank, which was very safe, but it was more troublesome to cash it. Now it is developed that banks can withdraw money from any outlet, even through ATM or foreign channels. It's just like buying electricity directly from the power company without having to equip every household with a generator. "Cloud computing" brings about such a change-computer storage and calculation centers are built by professional network companies such as Google and IBM, and users can easily access them through a network cable with the help of a browser, taking "cloud" as the center of data storage and application services. At present, cloud computing has developed two major fields: cloud security and cloud storage. For example, Rising and Trend Micro in China have started to provide cloud security products; Microsoft, Google and other international leaders are more involved in the field of cloud storage. \xd\\xd\ cloud computing-development conditions \xd\ (cloud computing) will inevitably become more and more common, and gradually develop into a mainstream computing mode to replace centralized large computers: \xd\\xd\1. The first reason for the distributed system now is that it has a better performance-price ratio than the centralized system. You don't have to spend hundreds of thousands of dollars to get high-performance computing. \xd\2. Most applications are distributed. Such as industrial enterprise applications, the management department and the site are not in the same place. \xd\\xd\3. High reliability. Redundancy is not only a necessary condition for biological evolution, but also an information technology. Modern distributed system has a high fault-tolerant mechanism, and the control of nuclear reactors mainly adopts distributed to achieve high reliability. \xd\\xd\4. Scalability. The cost of buying a mainframe with higher performance, or buying another mainframe with the same performance, is much higher than the cost of adding several PCs. \xd\\xd\5. High flexibility. It can be compatible with products from different hardware manufacturers, low-configuration machines and peripherals to obtain high-performance computing. \ xd \ xd \ cloud computing-category \xd\Markus Klems\xd\ cloud computing is a buzzword that includes development, load balancing, business model and architecture, and it is the future model of software industry (Software1.), or simply put, cloud computing is Internet-centric software. \xd\\xd\Reuven Cohen\xd\ Cloud computing is a web-based service, which aims to make users pay only for the functions they need, and at the same time eliminate the investment of traditional software in hardware, software and professional skills. Cloud computing allows users to get rid of the complexity of technology and deployment and get applications. \xd\\xd\Douglas Gourlay\xd\ Cloud computing refers to a big ambition. Basically, it is to let users access technical services through the Internet. Now, every time you log on to Facebook or search for a flight, you are actually using cloud computing. \ xd \ \ xd \ practicing gaw \ xd \ Cloud computing is the new Web2., a market blooming in existing technologies. Just as people used to declare themselves as Web2. by putting a little ajax on their websites, cloud computing is a new buzzword. \xd\\xd\ On the positive side, Web2. finally caught the mainstream eye. Similarly, the concept of cloud computing will eventually change people's thinking, and eventually a variety of concepts will erupt, such as hosting service, ASP, grid computing, software as service, platform as service and anything as service. \xd\\xd\Briande Haaff\xd\ From the consumer's point of view, SaaS is a kind of cloud computing, but people in the industry must understand what this means. Simply put, cloud computing is the sublimation of SaaS. \xd\\xd\Ben Kepes\xd\ The original intention of the cloud model is to make the consumption of the hardware layer like on-demand computing and according to the required storage space. In order to bring more power to the cloud model, we need to realize configuration, deployment and service in a virtual environment in the whole application architecture. \xd\\xd\Omar Sul