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This article mainly analyzes the relevant knowledge points of the basic knowledge of cloud computing virtualization, the content is detailed and easy to understand, the operation details are reasonable, and has a certain reference value. If you are interested, you might as well follow the editor and learn more about "what are the basics of cloud computing virtualization".

1. Both VMM and KVM are VM hypervisors or virtual machine monitors, which can create / run / manage virtual machines.

2.VMWare and VirtualBox generally run on the desktop or server as client applications, while Xen and KVM are bare-metal-oriented virtualization hypervisors that are more likely to perform with high performance close to physical hardware (bare metal) and server-oriented.

3.VMWare and VirtualBox can run on Windows and Linux and can create virtual machines for windows and linux; both Xen and KVM are based on the Linux kernel, so they can only run on Linux, but you can create virtual machines for Windows.

Both 4.VMWare and Citrix provide virtualization solutions. VMWare focuses on server virtualization and Citrix focuses on desktop virtualization and application virtualization. Similar companies that provide virtualization include MS,Oracle

Contrast VMvare Citrix

VMware vSphere (EXSi) XenServer (Xen)

VMvare Horizon View XenvDesktop

VMware ThinApp XenApp

5. Virtualization: hardware virtualization and software virtualization (operating system virtualization and application virtualization)

1. Single cpu simulation multi-cpu or x86 cpu simulation arm cpu

two。 Multiple operating systems run on one operating system, and their applications are isolated

6. Full virtualization: also known as hardware-assisted virtualization, a software hypervisor is added between the virtual machine and the hardware, that is, a VMM (type1 runs on hardware, such as Exsi and KVM,type2 running on another OS, such as Qemu and Wine)

Paravirtualization: also known as quasi-virtualization, on the basis of full virtualization, add a layer of API to optimize customer system instructions, such as Xen.

7.

Xen: supports full virtualization (Full) and paravirtualization (Para), and tends to paravirtualization. Based on the linux kernel, it is closely integrated with linux, but has its own process scheduler, storage management module, etc., and the hypervisor Domain0 (that is, a master virtual machine that manages other virtual machines Domain1-DomainN) at startup

KVM: supports full virtualization (Full) and paravirtualization (Para), and tends to be full virtualization. Based on the linux kernel, it does not have its own process scheduler, storage management module, etc., and directly uses the linux kernel as its hypervisor. The current Linux has integrated KVM by default.

QEMU:quick-emulator, a pure simulator, can simulate any hardware, mainly cpu. Both KVM and Xen use QEMU, or its basic functions.

Libvirt API is a set of C function libraries for virtualization attacks, which supports binding with other languages and includes five modules: hypervisor connection api, domain api, network api, storage volume api and storage pool api. Both a daemon libvirtd and a command line tool virsh are provided. )

The perfect integration of 8.KVM and Linux, such as directly taking advantage of the features of the new kernel, easy to upgrade, resulting in more and more people using KVM, so KVM is more popular than XEN. (XEN can provide higher performance bare metal virtualization, but less simplicity and ease of use.)

9.Linux hypervisor (GUI), open source or free, virtualbox, aqemu, virt-manager

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