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Virtual private server - Wikipedia, the free encyclopedia
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2 Short comparison
3 Where to go further
4 External links
There are several kinds of virtualization techniques which provide similar features but differ in the degree of abstraction and the methods used for virtualization.
 Virtual machines (VMs)
Virtual machines emulate some real or fictional hardware, which in turn requires real resources from the host (the machine running the VMs). This approach, used by most system emulators, allows the emulator to run an arbitrary guest operating system without modifications because guest OS is not aware that it is not running on real hardware. The main issue with this approach is that some CPU instructions require additional privileges and may not be executed in user space thus requiring a virtual machines monitor (VMM) to analyze executed code and make it safe on-the-fly. Hardware emulation approach is used by VMware products, VirtualBox, QEMU, Parallels and Microsoft Virtual Server.
This technique also requires a VMM, but most of its work is performed in the guest OS code, which in turn is modified to support this VMM and avoid unnecessary use of privileged instructions. The paravirtualization technique also enables running different OSs on a single server, but requires them to be ported, i.e. they should «know» they are running under the hypervisor. The paravirtualization approach is used by products such as Xen and UML.
 Virtualization on the OS level, a.k.a. containers virtualization
Most applications running on a server can easily share a machine with others, if they could be isolated and secured. Further, in most situations, different operating systems are not required on the same server, merely multiple instances of a single operating system. OS-level virtualization systems have been designed to provide the required isolation and security to run multiple applications or copies of the same OS (but different distributions of the OS) on the same server. OpenVZ, Virtuozzo, Linux-VServer, Solaris Zones and FreeBSD Jails are examples of OS-level virtualization.
 Short comparison
The three techniques differ in complexity of implementation, breadth of OS support, performance in comparison with standalone server, and level of access to common resources. For example, VMs have wider scope of usage, but poorer performance. Para-VMs have better performance, but can support fewer OSs because one has to modify the original OS.
Virtualization on the OS level provides the best performance and scalability compared to other approaches. Performance difference of such systems can be as low as 1…3%, comparing with that of a standalone server. Virtual Environments are usually also much simpler to administer as all of them can be accessed and administered from the host system. Generally, such systems are the best choice for server consolidation of same OS workloads.
 Where to go further
If you've decided to try OpenVZ virtualization solution go to OpenVZ installation section.
 External links
wikipedia: Operating system-level virtualization
HP Labs: Performance Evaluation of Virtualization Technologies for Server Consolidation
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About OpenVZ Wiki
A live migration and checkpointing feature was released for OpenVZ in the middle of April 2006. This makes it possible to move a container from one physical server to another without shutting down the container. The process is known as checkpointing: a container is frozen and its whole state is saved to a file on disk. This file can then be transferred to another machine and a container can be unfrozen (restored) there; the delay is roughly a few seconds. Because state is usually preserved completely, this pause may appear to be an ordinary computational delay.
 OpenVZ distinct features
As OpenVZ employs a single kernel model, it is as scalable as the Linux kernel; that is, it supports up to 4096 CPUs and up to 64 GB of RAM. (on 32-bit with PAE) A single container can scale up to the whole physical system, i.e. use all the CPUs and all the RAM.
The virtualization overhead observed in OpenVZ is limited, and is negligible in most scenarios.
By decreasing the overhead required for each container, it is possible to serve more containers from a given physical server, so long as the computational demands do not exceed the physical availability.
An administrator (i.e. root) of an OpenVZ physical server (also known as a hardware node or host system) can see all the running processes and files of all the containers on the system, and this has convenience implications. Some fixes (such as a kernel update) will affect all containers automatically, while other changes can simply be "pushed" to all the containers by a simple shell script.
Kernel-based Virtual Machine
From Wikipedia, the free encyclopedia
Screenshot of qemu/KVM running NetBSD, OpenSolaris and Kubuntu on an Arch Linux host.
Developer(s) Red Hat, Inc.
Written in C
Operating system Linux kernel
Type Platform virtualization
License GNU General Public License or GNU Lesser General Public License
In computing, Kernel-based Virtual Machine (KVM) is a virtual machine implementation using the operating system's kernel. This often allows for greater performance than when using virtual machine solutions which rely on user-space drivers. For the sake of this article, KVM will refer to the Linux kernel virtualization infrastructure. KVM supports native virtualization on x86 processors that provide Intel VT-x or AMD-V extensions but does not depend on it; it has also been ported to S/390, PowerPC, and IA-64, and an ARM port is in progress.
The Linux kernel 2.6.20 release (February 2007) was the first to include KVM.
A wide variety of guest operating-systems work with KVM, including many flavours of Linux, BSD, Solaris, Windows, Haiku, ReactOS and AROS Research Operating System and a modified version of Qemu can use KVM to run Mac OS X. Paravirtualization support is also available for Linux and Windows guests using the VirtIO framework; this includes a paravirtual Ethernet card, a disk I/O controller, a balloon device for adjusting guest memory-usage, and VGA graphics interface using SPICE or VMware drivers.
It uses SeaBIOS.
1 Design and licensing
2 Graphical management tools
3 Emulated hardware
5 See also
7 External links
 Design and licensing
By itself, KVM does not perform any emulation. Instead, a user-space program uses the /dev/kvm interface to set up the guest VM's address space, feeds it simulated I/O and maps its video display back onto the host's. At least two programs exploit this feature: a modified version of Qemu, and Qemu itself since version 0.10.0.
KVM's parts are licensed under various GNU licenses:
KVM kernel module: GPL v2
KVM user module: LGPL v2
QEMU virtual CPU core library (libqemu.a) and QEMU PC system emulator: LGPL
Linux user mode QEMU emulator: GPL
BIOS files (bios.bin, vgabios.bin and vgabios-cirrus.bin): LGPL v2 or later
KVM development was started at Qumranet, a technology startup bought in 2008 by Red Hat. KVM is maintained by Avi Kivity and Marcelo Tosatti.
KVM has also been ported to FreeBSD as a loadable kernel module.