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9a179fd65e
Signed-off-by: Andrea Bolognani <abologna@redhat.com> Reviewed-by: Michal Privoznik <mprivozn@redhat.com>
122 lines
3.7 KiB
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122 lines
3.7 KiB
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===================================
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Microsoft Hyper-V hypervisor driver
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===================================
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.. contents::
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The libvirt Microsoft Hyper-V driver can manage Hyper-V 2012 R2 and newer.
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Project Links
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-------------
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- The `Microsoft Hyper-V <https://docs.microsoft.com/en-us/windows-server/virtualization/hyper-v/hyper-v-on-windows-server>`__
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hypervisor
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Connections to the Microsoft Hyper-V driver
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-------------------------------------------
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Some example remote connection URIs for the driver are:
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::
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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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**Note**: In contrast to other drivers, the Hyper-V driver is a client-side-only
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driver. It connects to the Hyper-V server using WS-Management over HTTP(S).
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Therefore, the `remote transport mechanism <remote.html>`__ provided by the
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remote driver and libvirtd will not work, and you cannot use URIs like
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``hyperv+ssh://example.com``.
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URI Format
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~~~~~~~~~~
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URIs have this general form (``[...]`` marks an optional part).
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::
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hyperv://[username@]hostname[:port]/[?extraparameters]
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The default HTTPS ports is 5986. If the port parameter is given, it overrides
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the default port.
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Extra parameters
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^^^^^^^^^^^^^^^^
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Extra parameters can be added to a URI as part of the query string (the part
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following ``?``). A single parameter is formed by a ``name=value`` pair.
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Multiple parameters are separated by ``&``.
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::
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?transport=http
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The driver understands the extra parameters shown below.
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+---------------+-----------------------+-------------------------------------+
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| Name | Values | Meaning |
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+===============+=======================+=====================================+
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| ``transport`` | ``http`` or ``https`` | Overrides the default HTTPS |
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| | | transport. The default HTTP port is |
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| | | 5985. |
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+---------------+-----------------------+-------------------------------------+
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Authentication
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~~~~~~~~~~~~~~
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In order to perform any useful operation the driver needs to log into the
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Hyper-V server. Therefore, only ``virConnectOpenAuth`` can be used to connect to
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an Hyper-V server, ``virConnectOpen`` and ``virConnectOpenReadOnly`` don't work.
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To log into an Hyper-V server the driver will request credentials using the
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callback passed to the ``virConnectOpenAuth`` function. The driver passes the
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hostname as challenge parameter to the callback.
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**Note**: Currently only ``Basic`` authentication is supported by libvirt. This
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method is disabled by default on the Hyper-V server and can be enabled via the
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WinRM commandline tool.
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::
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winrm set winrm/config/service/auth @{Basic="true"}
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To allow ``Basic`` authentication with HTTP transport WinRM needs to allow
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unencrypted communication. This can be enabled via the WinRM commandline tool.
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However, this is not the recommended communication mode.
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::
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winrm set winrm/config/service @{AllowUnencrypted="true"}
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Version Numbers
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---------------
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Since Microsoft's build numbers are almost always over 1000, this driver needs
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to pack the value differently compared to the format defined by
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``virConnectGetVersion``. To preserve all of the digits, the following format is
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used:
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::
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major * 100000000 + minor * 1000000 + micro
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This results in ``virsh version`` producing unexpected output.
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.. list-table::
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:header-rows: 1
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* - Windows Release
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- Kernel Version
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- libvirt Representation
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* - Windows Server 2012 R2
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- 6.3.9600
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- 603.9.600
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* - Windows Server 2016
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- 10.0.14393
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- 1000.14.393
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* - Windows Server 2019
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- 10.0.17763
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- 1000.17.763
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