A virtual server, a virtual machine (VM), and an instance are different names for a collection of virtual computing and disk resources, a guest operating system, and its applications.
Virtualization has become the basis for the emergence of cloud computing – a new way of consuming computing resources in which the provider of resources and their user participate. The IT department acts as a “provider,” and everyone else acts as a user in a private cloud.
Under this model, public cloud providers lease resources to users for a specific time; users usually pay only for the time of use (pay-as-you-go payment model). In private corporate clouds, company divisions and various services can reserve resources from a shared pool in the same way, only without actual payment.
The word “cloud” itself refers to a pool of virtualized resources provided to the consumer by the provider for use.
For the technical organization of the cloud, above the hypervisor and under the set of virtual machines, they have special software (a cloud platform, such as OpenStack), abstracting the VM not only from the hardware but also from the hypervisors.
This allows you to share different hypervisors in one IT infrastructure, which are usually incompatible with each other. And also combine all virtual resources into a single pool with a centralized interface for management, distribution, and control.
It turns out that virtualization is a bridge to the transition to the clouds. And cloud platforms open up new opportunities for using virtual IT infrastructure. For example, you can organize access to resources for multiple users, host isolated projects on different hypervisors, and combine different hypervisors under common control. This is the task of the provider.
Cloud platforms help companies flexibly manage their IT infrastructure and scale it instantly. At the user’s request, as many resources as needed by the company’s applications are allocated. This allows you to maintain uninterrupted operation even under changing loads.
Also Read: How To Secure Remote Access To A Cloud Infrastructure?
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