Shulou(Shulou.com)06/02 Report--

The virtual machine runs in the virtual machine software, while the virtual machine software runs on the physical machine. A physical machine can virtualize multiple virtual machines through virtual machine software, and then install Windows or Linux operating system and various application software in the virtual machine, and then users connect to the virtual machine and use the application software in the virtual machine by means of remote desktop. If there is only one physical machine in a cloud center, then only one virtual machine software is needed, and the smallest quasi-cloud is created.

The core part of the cloud is virtualization software, central storage devices and virtual machine management tools (some people like to call it a cloud management platform, or even a cloud computing operating system). It makes sense to call it a "cloud computing operating system". Similar to computer operating systems (such as Windows, Linux, etc.), the core function of computer operating systems is to manage processes, and only processes can apply for resources (CPU, memory, printers, etc.).

In the cloud, virtual machine is the basic main body of applying for resources (computing, storage, network, etc.), and managing virtual machine is the core function of cloud computing operating system. But the cloud operating system is far less complex than the computer operating system, and it is an exaggeration to call it an operating system.

Cloud management tools are divided into three categories: IaaS, PaaS and SaaS. Cloud management tools in SaaS category are similar to online stores, mainly tenant registration, self-help, purchase, settlement, etc., which are closely related to the business, so there is no unified standard version of products. For example, for a cloud project of a large reliability software system, SaaS cloud management software consists of two parts: one is the SaaS business portal, the other is the SaaS management portal.

Although the framework is similar, SaaS cloud computing is closely related to specific applications, so so far, there is no general open source or commercial SaaS cloud computing management tool. Current SaaS cloud computing providers are all developed and used by themselves.

IaaS is the acronym for "Infrastructure as a Service", which means infrastructure as a service, that is, renting out the infrastructure layer of the IT system as a service. Cloud service providers build the infrastructure of the IT system, pool the computing equipment, and then directly lease hardware servers, virtual hosts, storage or network facilities (load balancers, firewalls, public network IP addresses and basic services such as DNS).

The factors for IaaS cloud service providers to calculate the rental fee include the amount of CPU, memory and storage, the network bandwidth consumed within a certain period of time, the number of public network IP addresses and some other value-added services (such as monitoring, automatic scaling, etc.).

PaaS is the acronym of "Platform as a Service", which means platform as a service, that is, renting out the platform software layer of the IT system as a service.

SaaS is the acronym for "Software as a Service", which means software as a service. In short, the software is deployed on the cloud, allowing users to use it through the Internet, that is, cloud service providers rent out the application software layer of the IT system as a service, while consumers can use any cloud terminal device to access the computer network, and then use the cloud software through a web browser or programming interface. This further lowers the technical threshold for tenants, and the application software does not need to be installed by itself, but uses the software directly.

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