mirror of
https://gitlab.com/libvirt/libvirt.git
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202 lines
8.9 KiB
HTML
202 lines
8.9 KiB
HTML
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<?xml version="1.0" encoding="ISO-8859-1"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<!--
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This file is autogenerated from drvuml.html.in
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Do not edit this file. Changes will be lost.
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-->
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<head>
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<meta http-equiv="Content-Type" content="text/html; charset=ISO-8859-1" />
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<link rel="stylesheet" type="text/css" href="main.css" />
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<link rel="SHORTCUT ICON" href="32favicon.png" />
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<title>libvirt: User Mode Linux driver</title>
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<meta name="description" content="libvirt, virtualization, virtualization API" />
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</head>
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<body>
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<div id="header">
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<div id="headerLogo"></div>
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<div id="headerSearch">
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<form action="search.php" enctype="application/x-www-form-urlencoded" method="get"><div>
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<input id="query" name="query" type="text" size="12" value="" />
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<input id="submit" name="submit" type="submit" value="Search" />
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</div></form>
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</div>
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</div>
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<div id="body">
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<div id="menu">
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<ul class="l0"><li>
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<div>
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<a title="Front page of the libvirt website" class="inactive" href="index.html">Home</a>
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</div>
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</li><li>
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<div>
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<a title="Details of new features and bugs fixed in each release" class="inactive" href="news.html">News</a>
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</div>
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</li><li>
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<div>
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<a title="Get the latest source releases, binary builds and get access to the source repository" class="inactive" href="downloads.html">Downloads</a>
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</div>
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</li><li>
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<div>
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<a title="Information for users, administrators and developers" class="active" href="docs.html">Documentation</a>
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<ul class="l1"><li>
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<div>
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<a title="Information about deploying and using libvirt" class="inactive" href="deployment.html">Deployment</a>
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</div>
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</li><li>
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<div>
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<a title="Overview of the logical subsystems in the libvirt API" class="inactive" href="intro.html">Architecture</a>
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</div>
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</li><li>
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<div>
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<a title="Description of the XML formats used in libvirt" class="inactive" href="format.html">XML format</a>
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</div>
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</li><li>
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<div>
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<a title="Hypervisor specific driver information" class="active" href="drivers.html">Drivers</a>
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<ul class="l2"><li>
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<div>
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<a title="Driver the Xen hypervisor" class="inactive" href="drvxen.html">Xen</a>
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</div>
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</li><li>
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<div>
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<a title="Driver for QEMU, KQEMU, KVM and Xenner" class="inactive" href="drvqemu.html">QEMU / KVM</a>
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</div>
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</li><li>
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<div>
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<a title="Driver for the Linux native container API" class="inactive" href="drvlxc.html">Linux Container</a>
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</div>
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</li><li>
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<div>
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<a title="Psuedo-driver simulating APIs in memory for test suites" class="inactive" href="drvtest.html">Test</a>
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</div>
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</li><li>
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<div>
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<a title="Driver providing secure remote to the libvirt APIs" class="inactive" href="drvremote.html">Remote</a>
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</div>
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</li><li>
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<div>
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<a title="Driver for the OpenVZ container technology" class="inactive" href="drvopenvz.html">OpenVZ</a>
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</div>
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</li><li>
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<div>
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<span class="active">UML</span>
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</div>
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</li><li>
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<div>
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<a title="Driver for the storage management APIs" class="inactive" href="storage.html">Storage</a>
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</div>
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</li></ul>
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</div>
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</li><li>
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<div>
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<a title="Reference manual for the C public API" class="inactive" href="html/index.html">API reference</a>
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</div>
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</li><li>
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<div>
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<a title="Bindings of the libvirt API for other languages" class="inactive" href="bindings.html">Language bindings</a>
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</div>
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</li></ul>
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</div>
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</li><li>
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<div>
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<a title="User contributed content" class="inactive" href="http://wiki.libvirt.org">Wiki</a>
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</div>
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</li><li>
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<div>
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<a title="Frequently asked questions" class="inactive" href="FAQ.html">FAQ</a>
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</div>
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</li><li>
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<div>
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<a title="How and where to report bugs and request features" class="inactive" href="bugs.html">Bug reports</a>
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</div>
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</li><li>
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<div>
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<a title="How to contact the developers via email and IRC" class="inactive" href="contact.html">Contact</a>
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</div>
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</li><li>
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<div>
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<a title="Miscellaneous links of interest related to libvirt" class="inactive" href="relatedlinks.html">Related Links</a>
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</div>
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</li><li>
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<div>
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<a title="Overview of all content on the website" class="inactive" href="sitemap.html">Sitemap</a>
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</div>
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</li></ul>
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</div>
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<div id="content">
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<h1>User Mode Linux driver</h1>
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<p>
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The UML driver for libvirt allows use and management of paravirtualized
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guests built for User Mode Linux. UML requires no special support in
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the host kernel, so can be used by any user of any linux system, provided
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they have enough free RAM for their guest's needs, though there are
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certain restrictions on network connectivity unless the adminstrator
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has pre-created TAP devices.
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</p>
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<h2>Connections to UML driver</h2>
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<p>
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The libvirt UML driver follows the QEMU driver in providing two
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types of connection. There is one privileged instance per host,
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which runs as root. This is called the "system" instance, and allows
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full use of all host resources. Then, there is a per-user unprivileged
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"session", instance. This has more restricted capabilities, and may
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require the host administrator to setup certain resources ahead of
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time to allow full integration with the network. Example connection
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URIs are
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</p>
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<pre>
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uml:///system (local access, system instance)
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uml:///session (local access, session instance)
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uml://example.com/system (remote access, TLS/x509)
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uml+tcp://example.com/system (remote access, SASl/Kerberos)
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uml+ssh://root@example.com/system (remote access, SSH tunnelled)
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</pre>
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<h2>Example XML configuration</h2>
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<p>
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User mode Linux driver only supports directly kernel boot at
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this time. A future driver enhancement may allow a paravirt
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bootloader in a similar style to Xen's pygrub. For now though,
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the UML kernel must be stored on the host and referenced
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explicitly in the "os" element. Since UML is a paravirtualized
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technology, the kernel "type" is set to "uml"
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</p>
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<p>
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There is not yet support for networking in the driver, but
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disks can be specified in the usual libvirt manner. The main
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variation is the target device naming scheme "ubd0", and
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bus type of "uml".
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</p>
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<p>
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Once booted the primary console is connected toa PTY, and
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thus accessible with "virsh console" or equivalent tools
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</p>
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<pre>
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<domain type='uml'>
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<name>demo</name>
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<uuid>b4433fc2-a22e-ffb3-0a3d-9c173b395800</uuid>
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<memory>500000</memory>
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<currentMemory>500000</currentMemory>
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<vcpu>1</vcpu>
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<os>
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<type arch='x86_64'>uml</type>
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<kernel>/home/berrange/linux-uml-2.6.26-x86_64</kernel>
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</os>
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<devices>
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<disk type='file' device='disk'>
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<source file='/home/berrange/FedoraCore6-AMD64-root_fs'/>
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<target dev='ubd0' bus='uml'/>
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</disk>
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<console type='pty'/>
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</devices>
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</domain>
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</pre>
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</div>
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</div>
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<div id="footer">
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<p id="sponsor">
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Sponsored by:<br /><a href="http://et.redhat.com/"><img src="et.png" alt="Project sponsored by Red Hat Emerging Technology" /></a></p>
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</div>
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</body>
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</html>
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