What is KVM? What is KVM virtual machine?

What is? KVM？

KVM, yes Keyboard Video Mouse Abbreviation ,KVM By connecting the keyboard directly 、 Video or mouse (KVM) port , Be able to access and control computers .KVM Technology does not require the target server to modify the software . This means that you can BIOS In the environment , Access the target computer at any time .KVM Provide real motherboard level access , It also supports multi platform servers and serial devices .KVM Technology has gone from the initial foundation SOHO Office type , Develop into an enterprise IT Infrastructure management system . It can be downloaded from kvm Client management software easily and directly access servers and devices located in multiple remote locations .KVM over IP The solution has perfect multi location fail over function 、 Meet new server management standards (IPMI) The direct interface of , And the ability to map local storage media to remote locations .

Kernel-based Virtual Machine For short , Is an open source system virtualization module , since Linux 2.6.20 Then integrated in Linux In each major release of . It USES Linux Its own scheduler to manage , So relative to Xen, Its core source code is very few .KVM It has become the mainstream of academia VMM One of .

What is? KVM virtual machine ？

KVM Virtualization of requires hardware support （ Such as Intel VT Technology or AMD V technology ). It's full virtualization based on hardware . and Xen In the early days, it was based on software simulation Para-Virtualization, The new version is full virtualization based on hardware support . but Xen It has its own process scheduler , Storage management module, etc , So the code is huge . Commercial system virtualization software is widely spread VMware ESX The series is based on software simulation Full-Virtualization.

KVM What are the advantages of virtualization ？

The traditional industry market is based on KVM The technology construction is mature 、 The stability of the IaaS platform .KVM Virtualization has the following advantages ：

1. Improve CPU、 Memory 、IO Resource utilization ;

2. Improve availability , Support load balancing 、 Dynamic migration 、 Automatic fault isolation, etc ;

3. Physical resource abstraction , Easy to deploy , Easy to manage .