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Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Matt Coleman <matt@datto.com>
151 lines
4.7 KiB
XML
151 lines
4.7 KiB
XML
<?xml version="1.0" encoding="UTF-8"?>
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<!DOCTYPE html>
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<html xmlns="http://www.w3.org/1999/xhtml">
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<body>
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<h1>Microsoft Hyper-V hypervisor driver</h1>
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<ul id="toc"></ul>
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<p>
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The libvirt Microsoft Hyper-V driver can manage Hyper-V 2012 R2 and newer.
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</p>
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<h2><a id="project">Project Links</a></h2>
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<ul>
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<li>
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The <a href="http://www.microsoft.com/hyper-v-server/">Microsoft Hyper-V</a>
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hypervisor
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</li>
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</ul>
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<h2><a id="uri">Connections to the Microsoft Hyper-V driver</a></h2>
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<p>
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Some example remote connection URIs for the driver are:
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</p>
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<pre>
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hyperv://example-hyperv.com (over HTTPS)
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hyperv://example-hyperv.com/?transport=http (over HTTP)
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</pre>
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<p>
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<strong>Note</strong>: In contrast to other drivers, the Hyper-V driver
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is a client-side-only driver. It connects to the Hyper-V server using
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WS-Management over HTTP(S). Therefore, the
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<a href="remote.html">remote transport mechanism</a> provided by the
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remote driver and libvirtd will not work, and you cannot use URIs like
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<code>hyperv+ssh://example.com</code>.
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</p>
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<h3><a id="uriformat">URI Format</a></h3>
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<p>
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URIs have this general form (<code>[...]</code> marks an optional part).
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</p>
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<pre>
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hyperv://[username@]hostname[:port]/[?extraparameters]
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</pre>
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<p>
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The default HTTPS ports is 5986. If the port parameter is given, it
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overrides the default port.
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</p>
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<h4><a id="extraparams">Extra parameters</a></h4>
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<p>
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Extra parameters can be added to a URI as part of the query string
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(the part following <code>?</code>). A single parameter is formed by a
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<code>name=value</code> pair. Multiple parameters are separated by
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<code>&</code>.
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</p>
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<pre>
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?transport=http
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</pre>
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<p>
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The driver understands the extra parameters shown below.
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</p>
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<table class="top_table">
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<tr>
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<th>Name</th>
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<th>Values</th>
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<th>Meaning</th>
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</tr>
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<tr>
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<td>
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<code>transport</code>
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</td>
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<td>
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<code>http</code> or <code>https</code>
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</td>
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<td>
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Overrides the default HTTPS transport. The default HTTP port
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is 5985.
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</td>
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</tr>
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</table>
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<h3><a id="auth">Authentication</a></h3>
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<p>
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In order to perform any useful operation the driver needs to log into
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the Hyper-V server. Therefore, only <code>virConnectOpenAuth</code> can
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be used to connect to an Hyper-V server, <code>virConnectOpen</code> and
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<code>virConnectOpenReadOnly</code> don't work.
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To log into an Hyper-V server the driver will request credentials using
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the callback passed to the <code>virConnectOpenAuth</code> function.
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The driver passes the hostname as challenge parameter to the callback.
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</p>
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<p>
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<strong>Note</strong>: Currently only <code>Basic</code> authentication
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is supported by libvirt. This method is disabled by default on the
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Hyper-V server and can be enabled via the WinRM commandline tool.
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</p>
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<pre>
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winrm set winrm/config/service/auth @{Basic="true"}
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</pre>
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<p>
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To allow <code>Basic</code> authentication with HTTP transport WinRM
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needs to allow unencrypted communication. This can be enabled via the
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WinRM commandline tool. However, this is not the recommended
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communication mode.
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</p>
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<pre>
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winrm set winrm/config/service @{AllowUnencrypted="true"}
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</pre>
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<h2><a id="versions">Version Numbers</a></h2>
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<p>
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Since Microsoft's build numbers are almost always over 1000, this driver
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needs to pack the value differently compared to the format defined by
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<code>virConnectGetVersion</code>.
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To preserve all of the digits, the following format is used:
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</p>
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<pre>major * 100000000 + minor * 1000000 + micro</pre>
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<p>
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This results in <code>virsh version</code> producing unexpected output.
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</p>
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<table class="top_table">
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<thead>
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<th>Windows Release</th>
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<th>Kernel Version</th>
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<th>libvirt Representation</th>
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</thead>
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<tr>
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<td>Windows Server 2012 R2</td>
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<td>6.3.9600</td>
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<td>603.9.600</td>
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</tr>
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<tr>
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<td>Windows Server 2016</td>
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<td>10.0.14393</td>
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<td>1000.14.393</td>
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</tr>
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<tr>
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<td>Windows Server 2019</td>
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<td>10.0.17763</td>
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<td>1000.17.763</td>
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</tr>
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</table>
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</body></html>
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