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31 lines
4.0 KiB
HTML
<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" /><link rel="stylesheet" type="text/css" href="libvir.css" /><link rel="SHORTCUT ICON" href="/32favicon.png" /><title>Introduction</title></head><body><div id="container"><div id="intro"><div id="adjustments"></div><div id="pageHeader"></div><div id="content2"><h1 class="style1">Introduction</h1><p>Libvir is a C toolkit to interact with the virtualization capabilities of
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recent versions of Linux (and other OSes), but libvir won't try to provide
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all possible interfaces for interacting with the virtualization features.</p><p>To avoid ambiguity about the terms used here here are the definitions for
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some of the specific concepts used in libvir documentation:</p><ul><li>a <strong>node</strong> is a single physical machine</li>
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<li>an <strong>hypervisor</strong> is a layer of software allowing to
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virtualize a node in a set of virtual machines with possibly different
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configurations than the node itself</li>
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<li>a <strong>domain</strong> is an instance of an operating system running
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on a virtualized machine provided by the hypervisor</li>
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</ul><p style="text-align: center"><img alt="Hypervisor and domains running on a node" src="node.gif" /></p><p>Now we can define the goal of libvir: to provide the lowest possible
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generic and stable layer to manage domains on a node.</p><p>This implies the following:</p><ul><li>the API should not be targetted to a single virtualization environment
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though Xen is the current default, which also means that some very
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specific capabilities which are not generic enough may not be provided as
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libvir APIs</li>
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<li>the API should allow to do efficiently and cleanly all the operations
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needed to manage domains on a node</li>
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<li>the API will not try to provide hight level multi-nodes management
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features like load balancing, though they could be implemented on top of
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libvir</li>
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<li>stability of the API is a big concern, libvir should isolate
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applications from the frequent changes expected at the lower level of the
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virtualization framework</li>
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</ul><p>So libvir should be a building block for higher level management tools and
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for applications focusing on virtualization of a single node (the only
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exception being domain migration between node capabilities which may need to
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be added at the libvir level). Where possible libvir should be extendable to
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be able to provide the same API for remote nodes, however this is not the
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case at the moment, the code currently handle only local node accesses.</p></div></div><div class="linkList2"><div class="llinks2"><h3 class="links2"><span>main menu</span></h3><ul><li><a href="index.html">Home</a></li><li><a href="news.html">Releases</a></li><li><a href="intro.html">Introduction</a></li><li><a href="architecture.html">libvir architecture</a></li><li><a href="downloads.html">Downloads</a></li><li><a href="FAQ.html">FAQ</a></li><li><a href="bugs.html">Reporting bugs and getting help</a></li><li><a style="font-weight:bold" href="html/index.html">API Menu</a></li><li><a href="ChangeLog.html">Recent Changes</a></li></ul></div><div class="llinks2"><h3 class="links2"><span>related links</span></h3><ul><li><a href="https://www.redhat.com/archives/libvir-list/">Mail archive</a></li><li><a href="http://www.cl.cam.ac.uk/Research/SRG/netos/xen/index.html">Xen project</a></li><li><form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><input name="query" type="text" size="12" value="Search..." /><input name="submit" type="submit" value="Go" /></form></li><li><a href="http://xmlsoft.org/"><img src="Libxml2-Logo-90x34.gif" alt="Made with Libxml2 Logo" /></a></li></ul><p class="credits">Graphics and design by <a href="mail:dfong@redhat.com">Diana Fong</a></p></div></div><div id="bottom"><p class="p1"></p></div></div></body></html>
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