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What is Hypervisor?

What is a Hypervisor? 

Main concept of virtualization is to avoid the cost of buying multiple hardwares. To utilize a single system/ Hardware /Server in a way that it could run multiple operating systems is what called virtualization. And this technique is become the most famous especially all over the data centers environments and you can use this technique on your personal laptop or pc.

 Hypervisor, also known as a virtual machine monitor, is a process that creates and runs virtual machines (VMs). A hypervisor allows one host computer to support multiple guest VMs by virtually sharing its resources, like memory and processing. Generally, there are two types of hypervisors. Type 1 hypervisors, called “bare metal,” run directly on the host’s hardware. Type 2 hypervisors, called “hosted,” run as a software layer on an operating system, like other computer programs

 If virtualization is defined as enabling multiple operating systems to run on a single host computer, then the essential component in the virtualization stack is the hyper-visor . This hyper-visor, also called Virtual Machine Monitor (VMM), creates a virtual platform on the host computer, on top of which multiple guest operating systems are executed and monitored. This way, multiple operating systems, which are either multiple instances of the same operating system, or different operating systems, can share the hardware resources offered by the host.

Types of Hypervisor –

TYPE-1 Hypervisor:
Hypervisor runs directly on underlying host system.It is also known as “Native Hypervisor” or “Bare metal hypervisor”.It dose not require any base server operating system.It has direct access to hardware resources.Examples of Type 1 hypervisors include VMware ESXi, Citrix XenServer and Microsoft Hyper-V hypervisor.
TYPE-2 Hypervisor:
A Host operating system runs on underlying host system.It is also known as ‘Hosted Hypervisor”.Basically a software installed on an operating system. Hypervisor asks operating system to make hardware calls.Example of Type 2 hypervisor include VMware Player or Parallels Desktop. Hosted hypervisors are often found on endpoints like PCs.


KVM (IMP TO KNOW)

This is a virtualization infrastructure for the Linux kernel. It supports native virtualization on processors with hardware virtualization extensions.
The open-source KVM (or Kernel-Based Virtual Machine) is a Linux-based type-1 hypervisor that can be added to most Linux operating systems including Ubuntu, Debian, SUSE, and Red Hat Enterprise Linux, but also Solaris, and Windows.

We use KVM in my Private Cloud:

  • Virtualization engine – OpenStack on KVM
  • Predefined virtual servers based on Debian
  • Orchestration and management web dashboard, a customized Horizon dashboard.
The owner of the tenant or the IT administrator, can manage his virtual servers, users, groups and monitor the status of the used application from a single dashboard.
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