Merge "[image-guide] Convert create images to RST"
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doc/image-guide-rst/source/centos-image.rst
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doc/image-guide-rst/source/centos-image.rst
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=====================
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Example: CentOS image
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=====================
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======================
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Create images manually
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======================
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.. toctree::
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:maxdepth: 2
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net-running.rst
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virt-manager.rst
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virt-install.rst
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centos-image.rst
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ubuntu-image.rst
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fedora-image.rst
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windows-image.rst
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freebsd-image.rst
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Creating a new image is a step done outside of your
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OpenStack installation. You create the new image manually on
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your own system and then upload the image to your cloud.
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To create a new image, you will need the installation CD or
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DVD ISO file for the guest operating system. You will also need
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access to a virtualization tool. You can use KVM for this. Or,
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if you have a GUI desktop virtualization tool (such as, VMware
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Fusion or VirtualBox), you can use that instead.
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Convert the file to raw once you are done.
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When you create a new virtual machine image, you will need
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to connect to the graphical console of the hypervisor, which
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acts as the virtual machine's display and allows you to interact
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with the guest operating system's installer using your keyboard
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and mouse. KVM can expose the graphical console using the
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`VNC <https://en.wikipedia.org/wiki/Virtual_Network_Computing>`_
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(Virtual Network Computing) protocol or the newer
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`SPICE <http://spice-space.org>`_ protocol.
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We will use the VNC protocol here, since you are more likely
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to find a VNC client that works on your local desktop.
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doc/image-guide-rst/source/fedora-image.rst
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doc/image-guide-rst/source/fedora-image.rst
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=====================
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Example: Fedora image
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=====================
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doc/image-guide-rst/source/figures/virt-manager.png
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doc/image-guide-rst/source/figures/virt-manager.png
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doc/image-guide-rst/source/freebsd-image.rst
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doc/image-guide-rst/source/freebsd-image.rst
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======================
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Example: FreeBSD image
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======================
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doc/image-guide-rst/source/net-running.rst
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doc/image-guide-rst/source/net-running.rst
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=============================================
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Verify the libvirt default network is running
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=============================================
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Before starting a virtual machine with libvirt, verify
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that the libvirt ``default`` network has started.
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This network must be active for your virtual machine
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to be able to connect out to the network.
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Starting this network will create a Linux bridge (usually
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called ``virbr0``), iptables rules, and a dnsmasq process
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that will serve as a DHCP server.
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To verify that the libvirt ``default`` network is enabled,
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use the :command:`virsh net-list` command and verify
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that the ``default`` network is active:
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.. code-block:: console
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# virsh net-list
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Name State Autostart
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-----------------------------------------
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default active yes
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If the network is not active, start it by doing:
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.. code-block:: console
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# virsh net-start default
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doc/image-guide-rst/source/ubuntu-image.rst
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doc/image-guide-rst/source/ubuntu-image.rst
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=====================
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Example: Ubuntu image
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=====================
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doc/image-guide-rst/source/virt-install.rst
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doc/image-guide-rst/source/virt-install.rst
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========================================================
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Use virt-install and connect by using a local VNC client
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========================================================
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If you do not wish to use virt-manager (for example, you do not
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want to install the dependencies on your server, you don't have
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an X server running locally, the X11 forwarding over SSH isn't
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working), you can use the :command:`virt-install` tool to boot
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the virtual machine through libvirt and connect to the graphical
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console from a VNC client installed on your local machine.
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Because VNC is a standard protocol, there are multiple clients
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available that implement the VNC spec, including
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`TigerVNC <http://sourceforge.net/apps/mediawiki/tigervnc/
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index.php?title=Welcome_to_TigerVNC>`_ (multiple platforms),
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`TightVNC <http://tightvnc.com/>`_ (multiple platforms),
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`RealVNC <http://realvnc.com/>`_ (multiple platforms),
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`Chicken <http://sourceforge.net/projects/chicken/>`_ (Mac OS X),
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`Krde <http://userbase.kde.org/Krdc>`_ (KDE),
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`Vinagre <http://projects.gnome.org/vinagre/>`_ (GNOME).
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The following example shows how to use the :command:`qemu-img`
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command to create an empty image file, and :command:`virt-install`
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command to start up a virtual machine using that image file. As root:
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.. code-block:: console
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# qemu-img create -f qcow2 /data/centos-6.4.qcow2 10G
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# virt-install --virt-type kvm --name centos-6.4 --ram 1024 \
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--cdrom=/data/CentOS-6.4-x86_64-netinstall.iso \
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--disk path=/data/centos-6.4.qcow2,size=10,format=qcow2 \
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--network network=default \
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--graphics vnc,listen=0.0.0.0 --noautoconsole \
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--os-type=linux --os-variant=rhel6
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Starting install...
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Creating domain... | 0 B 00:00
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Domain installation still in progress. You can reconnect to
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the console to complete the installation process.
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The KVM hypervisor starts the virtual machine with the
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libvirt name, ``centos-6.4``, with 1024 MB of RAM.
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The virtual machine also has a virtual CD-ROM drive associated
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with the ``/data/CentOS-6.4-x86_64-netinstall.iso`` file and
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a local 10 GB hard disk in qcow2 format that is stored
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in the host at ``/data/centos-6.4.qcow2``.
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It configures networking to use libvirt default network.
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There is a VNC server that is listening on all interfaces,
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and libvirt will not attempt to launch a VNC client automatically
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nor try to display the text console (``--no-autoconsole``).
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Finally, libvirt will attempt to optimize the configuration
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for a Linux guest running a RHEL 6.x distribution.
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.. note::
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When using the libvirt ``default`` network, libvirt will
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connect the virtual machine's interface to a bridge
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called ``virbr0``. There is a dnsmasq process managed
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by libvirt that will hand out an IP address on the
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192.168.122.0/24 subnet, and libvirt has iptables rules
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for doing NAT for IP addresses on this subnet.
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Run the :command:`virt-install --os-variant list` command
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to see a range of allowed ``--os-variant`` options.
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Use the :command:`virsh vncdisplay vm-name` command
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to get the VNC port number.
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.. code-block:: console
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# virsh vncdisplay centos-6.4
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:1
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In the example above, the guest ``centos-6.4`` uses VNC
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display ``:1``, which corresponds to TCP port ``5901``.
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You should be able to connect a VNC client running on
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your local machine to display ``:1`` on the remote
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machine and step through the installation process.
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doc/image-guide-rst/source/virt-manager.rst
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doc/image-guide-rst/source/virt-manager.rst
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============================
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Use the virt-manager X11 GUI
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============================
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If you plan to create a virtual machine image on a machine that
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can run X11 applications, the simplest way to do so is to use
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the :command:`virt-manager` GUI, which is installable as the
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``virt-manager`` package on both Fedora-based and Debian-based systems.
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This GUI has an embedded VNC client that will let you view and
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interact with the guest's graphical console.
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If you are building the image on a headless server, and
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you have an X server on your local machine, you can launch
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:command:`virt-manager` using ssh X11 forwarding to access the GUI.
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Since virt-manager interacts directly with libvirt, you typically
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need to be root to access it. If you can ssh directly in as root
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(or with a user that has permissions to interact with libvirt), do:
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.. code-block:: console
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$ ssh -X root@server virt-manager
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If the account you use to ssh into your server does not have
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permissions to run libvirt, but has sudo privileges, do:
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.. code-block:: console
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$ ssh -X root@server
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$ sudo virt-manager
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.. note::
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The ``-X`` flag passed to ssh will enable X11 forwarding over ssh.
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If this does not work, try replacing it with the ``-Y`` flag.
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Click the ``New`` button at the top-left and step through the instructions.
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.. figure:: figures/virt-manager.png
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:width: 100%
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You will be shown a series of dialog boxes that will allow you
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to specify information about the virtual machine.
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.. note::
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When using qcow2 format images you should check the option
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``customize before install``, go to disk properties and
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explicitly select the qcow2 format.
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This ensures the virtual machine disk size will be correct.
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doc/image-guide-rst/source/windows-image.rst
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================================
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Example: Microsoft Windows image
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================================
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