云计算的特点和四个阶段(云计算的三个阶段)

Cloud computing is a pay-per-use model that provides available, convenient, on-demand network access and configurable computing resource sharing. Pools (resources including networks, servers, storage, applications, services) that can be provisioned quickly with minimal management effort or minimal interaction with service providers.

Cloud computing features: ultra-large scale, virtualization, high reliability, versatility, high scalability, on-demand services, and extremely cheap.

Virtualization concept:

Virtualization is a technology that integrates, manages and reallocates computer hardware resource images through software means. Commonly used means include virtual machine-based virtualization and Container-based virtualization.

Virtualization scenario classification:

Operating system virtualization

Application virtualization

Desktop application virtualization

Network virtualization

The difference between cloud computing and virtualization

There is a classic saying to describe the difference between cloud computing and virtualization: Virtualization is a major way for cloud computing to build resource pools. As long as you understand this sentence thoroughly, you will know the relationship between them.

To put it simply, cloud computing is a concept, not a specific technology. Virtualization is a specific technology that refers to products that virtualize hardware resources to achieve isolation, scalability, security, and full utilization of resources.

Currently, cloud computing mostly relies on virtualization. By virtualizing multiple servers, they form a resource pool to achieve joint computing and resource sharing. This is what is now called cloud computing. In fact, before this term was coined, server clusters in the past had already implemented these functions, but they were not as advanced as they are now.

The basic characteristics of cloud computing are security, scalability, and virtualization.

1. Security

Security is one of the core features of cloud computing. It is guaranteed by creating snapshots of stored data. Data security, even if one of the servers is damaged, the data will not be lost.

Storage services are fast and reliable, and network security is the key to protecting data security. Cloud services can provide professional security teams to deal with network security risks. In addition, cloud computing also adopts high reliability and high reliability design to further ensure the reliability of services.

2. Scalability

Scalability is a characteristic of cloud computing. It refers to the considerable scale of the cloud computing center and the number of servers in many companies that provide cloud computing. It has reached the level of hundreds of thousands or millions. The cloud can integrate these large numbers of computer clusters to provide users with unprecedented storage and computing capabilities.

3. Virtualization

Virtualization is an important feature of cloud computing. Through virtualization technology, users can be liberated from inefficient and low-capability business models. , enter efficient mode.

Virtualization supports the use of various terminal devices at any location and at any time to obtain services and resources. Users do not need to know the specific location where specific applications are running. They only need a laptop or PDA to obtain various capabilities through the Internet. Super service.

Introduction and background of cloud computing:

1. Introduction

Cloud computing is distributed computing One refers to decomposing huge data calculation processing programs into countless small programs through the network "cloud", and then processing and analyzing these small programs through a system composed of multiple servers to obtain results and return them to the user.

In the early days of cloud computing, to put it simply, it was simple distributed computing, solving task distribution and merging calculation results. Therefore, cloud computing is also called grid computing. Through this technology, tens of thousands of data can be processed in a very short time (a few seconds), thereby achieving powerful network services.

2. Background

The Internet began to rise in 1960 and is mainly used for plain text email or news cluster services between the military, large enterprises, etc. The concept of cloud computing was first proposed at the Search Engine Conference in August 2006, becoming the third revolution of the Internet.

Please introduce the concepts and characteristics of cloud computing and the Internet of Things respectively. (The format should be clear, answer in four paragraphs) as follows:

Cloud computing is a computing model that provides resources and services to users through the Internet. The Internet of Things refers to connecting various devices through the Internet to achieve Information exchange and sharing.

1. The concept and characteristics of cloud computing

Cloud computing concept: Cloud computing is an Internet-based computing model that provides flexible resources by storing data on remote servers. and services that users can access and use anytime, anywhere.

2. Characteristics of cloud computing:

High scalability: Cloud computing is based on a distributed system architecture and can flexibly expand computing resources according to demand to meet Business needs of different sizes. High resource sharing and utilization: Multiple users can share the same set of hardware resources, improving resource utilization efficiency and reducing costs.

High reliability and availability: Cloud computing service providers usually have multiple data centers and backup mechanisms to ensure data security and recoverability in the event of a failure or disaster. Flexible payment model: Cloud computing provides a pay-as-you-go model, where users only pay for the resources actually used, saving costs and increasing economic benefits.

3. The concept and characteristics of the Internet of Things

The concept of the Internet of Things: The Internet of Things is a technology that interconnects sensors, devices and objects and performs data exchange and communication through the network to achieve Intelligent interconnection between objects.

4. Characteristics of the Internet of Things:

Large-scale connection: The Internet of Things forms a huge network by connecting various devices and objects to achieve Collaborative work and information interaction between devices. Real-time sensing and data collection: Sensors in the Internet of Things can sense the environment in real time, collect data, and upload it to the cloud for analysis and processing, providing accurate information support for decision-making.

Automation and intelligence: The Internet of Things realizes automatic identification, automatic matching and automatic operation of equipment through automatic control and intelligent algorithms, improving work efficiency and effectiveness. Cross-industry applications: IoT technology is widely used in agriculture, medical care, transportation, industry and other fields, bringing huge development opportunities and changes to various industries.