Virtual machine is running in a virtual machine software, the software runs on a virtual machine and a physical machine. A single physical machine virtual virtual machine software can be a multiple virtual machines, virtual machine and then install the Windows or Linux operating systems and various software applications, and users connect via Remote Desktop and other ways to use virtual machines and applications in a virtual machine software. If a cloud center only a single physical machine, a virtual machine software as long as you can, this is a minimum of quasi-cloud now created.
The cloud is the core part of virtualization software, central storage and virtual machine management tools (some people like to call cloud management platform, or even directly called cloud computing operating system). Called "cloud operating system" is a grain of truth, and computer operating systems (such as Windows, Linux, etc.) is similar to the core functions of the computer operating system is to manage the process, only the process to apply for resources (CPU, memory, printers, etc. ).
In the cloud, the virtual machine is the application of resources (compute, storage, network, etc.) of the basic body, virtual machine management is the core function of the cloud operating system. But cloud computing operating system is far less complex computer operating system, called OS seems a bit overblown.
Cloud management tools fall into IaaS, PaaS and SaaS 3 categories, SaaS category of cloud management tools and shop almost, mostly tenants registered, self-help, purchasing, billing and other business associated with large, so there is no uniform standard version product. For example, a large-scale project for the cloud reliability of software systems, SaaS cloud management software consists of two parts: First, SaaS Business Portal, and second, SaaS management portal.
Although similar framework, but the SaaS cloud computing is closely related to the specific application software, so far, there is no common open-source or commercial SaaS cloud computing management tools appear. The current SaaS cloud providers themselves are developing their own use.
IaaS is "Infrastructure as a Service" acronym, meaning that infrastructure as a service, namely the infrastructure services layer of IT systems as rented out. By the cloud service provider infrastructure to build IT systems, and computing equipment pooling, and then direct lease hardware servers, web hosting, storage or network infrastructure (load balancers, firewalls, and public IP address, such as DNS and other basic services) and so on.
Number of factors IaaS cloud computing service providers lease costs, including CPU, memory and storage, and network bandwidth consumption within a certain time, IP address of the public network and the number of other value-added services required (such as monitoring, auto-scaling, etc.) and so on.
PaaS is a "Platform as a Service" acronym, meaning platform as a service, platform software layer that is the IT system as a service rented out.
SaaS is a "Software as a Service" acronym, which means software as a service. In short, the software is deployed in the cloud, allowing users to use it over the Internet, that is cloud-service provider of IT systems to the application software layer as a service rented out, and consumers can use any cloud terminal devices to access the computer network, and then cloud software interface through a web browser or program. This further reduces the technical threshold of tenants, there is no need to install their own software applications, but rather directly using the software.
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