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https://gitlab.com/libvirt/libvirt.git
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f2f9742d4d
The rule generating the HTML docs passing the --html flag to xsltproc. This makes it use the legacy HTML parser, which either ignores or tries to fix all sorts of broken XML tags. There's no reason why we should be writing broken XML in the first place, so removing --html and adding the XHTML doctype to all files forces us to create good XML. This adds the XHTML doc type and fixes many, many XML tag problems it exposes. Signed-off-by: Daniel P. Berrange <berrange@redhat.com>
94 lines
3.4 KiB
XML
94 lines
3.4 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//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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<body>
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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 administrator
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has pre-created TAP devices.
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</p>
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<h2><a name="project">Project Links</a></h2>
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<ul>
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<li>
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The <a href="http://user-mode-linux.sourceforge.net/">User
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Mode Linux</a> paravirtualized kernel
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</li>
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</ul>
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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:///session (local access to per-user instance)
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uml+unix:///session (local access to per-user instance)
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uml:///system (local access to system instance)
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uml+unix:///system (local access to system 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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</body>
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</html>
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