Shulou(Shulou.com)06/02 Report--

Classification of virtualization technologies:

(1) Simulation: Emulation:

Qemu,PearPC,Bochs

(2) full Virtualization: Full Virtualization,Native Virtualization

HVM

VMware Workstation,VirtualBox,VMWare Server,Parallels Desktop,KVM,XEN

(3) paravirtualization: ParaVirtualization

GuestOS: know that you are running Virtualization

Hypercall

(4) OS-level virtualization:

Divide user controls into multiple, isolated from each other

Container-level virtualization

OpenVZ,LXC (LinuX Container), libcontainer,Virtuozzo,Linux V Servers

(5) Library-level virtualization

WINE

Type-I,Type-II

IaaS:Infrastructure, Infrastructure Servic

PaaS:Platfrom, platform as a Service

Xen:

University of Cambridge, open source VMM

Xen components: (1) Xen Hypervisor allocates CPU, Memory, Interrupt (2) Dom0 privilege domains, and Icano allocates network equipment net-front (GuestOS) Net-backend Block device block-front (GuestOS) Block-backend Linux Kernel: 2.6.37: start to support running Dom0 3.0. key features are optimized to provide management DomU toolstack to add, start, snapshot, stop, delete and other operations on virtual machines (3) DomU non-privileged domain, according to its virtualization implementation, there are many types of PV: paravirtualized HVM: hardware-assisted virtualization

Xen's PV technology:

Does not rely on the HVM feature of CPU, but requires the kernel of GuestOS to make changes to know that it is running in a PV environment

OS:Linux (2.6.24 +) running in DomU, NetBSD,FreeBSD,OpenSolaris

Xen's HVM technology:

Rely on Inter VT or AMD AMD-V, and also rely on Qemu to simulate IO devices

OS running in DomU: almost all that support this X86 platform

PV on HVM:

CPU runs in HVM mode

The IO device runs in PV mode

OS running in DomU: as long as OS can drive IO devices of PV interface type

Net-front,blk-front

Xen's tool stack:

Xm/xend: start the xend service in Xen Hypervisor's Dom0 traditional Chinese medicine

Xm: command line management tool with many sub-commands

Create,destroy,stop,pause...

Xl: based on the lightweight command line toolstack provided by libxenlight; xe/xapi: provides api for xen management, so it is mostly used in cloud environments, Xen Server,XCP virsh/libvirt:

XenStore:

A shared information storage space for each Domain, with a hierarchical namespace located in Dom0

CentOS support for Xen:

RHEL 5.7 Murray: the default virtualization technology is xen

Kernel version:2.6.18

Kernel-

Kernel-xen

RHEL 6: only kvm is supported

Dom0: not supported

DomU: support

How to use Xen on CentOS 6.6:

(1) compile the kernel version 3.0 and start the support for Dom0

(2) compiling xen programs

Projects related to the production of related programs:

Xen4centos

Xen made easy

Para Virt

Xen Para-virtualization Architecture

Xen tool:

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