Virtualization type (with picture)

Virtualization Type

• Host virtualization: The host virtualization architecture refers to the installation and running of virtualization programs on the host operating system, which depends on the host operating system's support for devices and the management of physical resources.Virtualization management software acts as a common application on the underlying operating system (Windows or Linux, etc.), and then creates a corresponding virtual machine through it to share the underlying server resources.It can also be understood as installing and running a virtualized program on the host operating system, depending on the host operating system's support for the device and the management of physical resources.
  

• Bare metal virtualization: The bare metal virtualization architecture refers to installing virtualization software directly on the hardware, then installing the operating system and applications on it, and relying on the virtualization layer kernel and server console for management.Hypervisor is a hypervisor that runs directly on physical hardware.It mainly implements two basic functions: first, it is to identify, capture and respond to CPU privileged instructions or protection instructions issued by the virtual machine; secondly, it is responsible for processing virtual machine queues and scheduling, and returning the processing results of physical hardware to the corresponding virtual machine.machine.
  

• OS virtualization: The OS virtualization architecture adds virtual server functions at the OS level.The OS virtualization architecture divides a single OS into multiple containers, which are managed by a container manager.The host operating system is responsible for distributing hardware resources among multiple virtual servers (i.e. containers) and keeping these servers independent of each other.
  There is no separate hypervisor layer.One notable difference is that with OS layer virtualization, all virtual servers must run the same OS (although each instance has its own application and user account).
  

Hybrid virtualization: Inserts a kernel-level driver into the host operating system kernel.This driver acts as a virtual hardware manager to coordinate hardware access between the virtual machine and the host operating system.Hybrid virtualization requires the underlying hardware to support virtualization extensions.