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+.. _vyos-on-gns3:
+
+###############
+Running on GNS3
+###############
+
+Sometimes you may want to test VyOS in a lab environment.
+`GNS3 <http://www.gns3.com>`__ is a network emulation software you
+might use for it.
+
+This guide will provide the necessary steps for installing
+and setting up VyOS on GNS3.
+
+Requirements
+------------
+
+The following items are required:
+
+* A VyOS installation image (.iso file). You
+  can find how to get it on the :ref:`installation` page
+
+* A working GNS3 installation. For further information see the
+  `GNS3 documentation <https://docs.gns3.com/>`__.
+
+.. _vm_setup:
+
+VM setup
+--------
+
+First, a virtual machine (VM) for the VyOS installation must be created
+in GNS3.
+
+Go to the GNS3 **File** menu, click **New template** and choose select
+**Manually create a new Template**.
+
+.. figure:: /_static/images/gns3-01.png
+
+Select **Quemu VMs** and then click on the ``New`` button.
+
+.. figure:: /_static/images/gns3-02.png
+
+Write a name for your VM, for instance "VyOS", and click ``Next``.
+
+.. figure:: /_static/images/gns3-03.png
+
+Select **qemu-system-x86_64** as Quemu binary, then **512MB** of RAM
+and click ``Next``.
+
+.. figure:: /_static/images/gns3-04.png
+
+Select **telnet** as your console type and click ``Next``.
+
+.. figure:: /_static/images/gns3-05.png
+
+Select **New image** for the base disk image of your VM and click
+``Create``.
+
+.. figure:: /_static/images/gns3-06.png
+
+Use the defaults in the **Binary and format** window and click
+``Next``.
+
+.. figure:: /_static/images/gns3-07.png
+
+Use the defaults in the **Qcow2 options** window and click ``Next``.
+
+.. figure:: /_static/images/gns3-08.png
+
+Set the disk size to 2000 MiB, and click ``Finish`` to end the **Quemu
+image creator**.
+
+.. figure:: /_static/images/gns3-09.png
+
+Click ``Finish`` to end the **New QEMU VM template** wizard.
+
+.. figure:: /_static/images/gns3-10.png
+
+Now the VM settings have to be edited.
+
+Being again at the **Preferences** window, having **Qemu VMs**
+selected and having our new VM selected, click the ``Edit`` button.
+
+.. figure:: /_static/images/gns3-11.png
+
+In the **General settings** tab of your **QEMU VM template
+configuration**, do the following:
+
+* Click on the ``Browse...`` button to choose the **Symbol** you want to
+  have representing your VM.
+* In **Category** select in which group you want to find your VM.
+* Set the **Boot priority** to **CD/DVD-ROM**.
+
+.. figure:: /_static/images/gns3-12.png
+
+At the **HDD** tab, change the Disk interface to **sata** to speed up
+the boot process.
+
+.. figure:: /_static/images/gns3-13.png
+
+At the **CD/DVD** tab click on ``Browse...`` and locate the VyOS image
+you want to install.
+
+.. figure:: /_static/images/gns3-14.png
+
+.. note:: You probably will want to accept to copy the .iso file to your
+   default image directory when you are asked.
+
+In the **Network** tab,  set **0** as the number of adapters, set the
+**Name format** to **eth{0}** and the **Type** to **Paravirtualized
+Network I/O (virtio-net-pci)**.
+
+.. figure:: /_static/images/gns3-15.png
+
+In the **Advanced** tab, unmark the checkbox **Use as a linked base
+VM** and click ``OK``, which will save and close the **QEMU VM template
+configuration** window.
+
+.. figure:: /_static/images/gns3-16.png
+
+At the general **Preferences** window, click ``OK`` to save and close.
+
+.. figure:: /_static/images/gns3-17.png
+
+
+.. _vyos_installation:
+
+VyOS installation
+-----------------
+
+* Create a new project.
+* Drag the newly created VyOS VM into it.
+* Start the VM.
+* Open a console.
+  The console should show the system booting. It will ask for the login
+  credentials, you are at the VyOS live system.
+* `Install VyOS <https://docs.vyos.io/en/latest/install.html#install>`__
+  as normal (that is, using the ``install image`` command).
+
+* After a successful installation, shutdown the VM with the ``poweroff``
+  command.
+
+* **Delete the VM** from the GNS3 project.
+
+The *VyOS-hda.qcow2* file now contains a working VyOS image and can be
+used as a template. But it still needs some fixes before we can deploy
+VyOS in our labs.
+
+.. _vyos_vm_configuration:
+
+VyOS VM configuration
+---------------------
+
+To turn the template into a working VyOS machine, further steps are
+necessary as outlined below:
+
+**General settings** tab: Set the boot priority to **HDD**
+
+.. figure:: /_static/images/gns3-20.png
+  
+**CD/DVD** tab: Unmount the installation image file by clearing the
+**Image** entry field.
+
+.. figure:: /_static/images/gns3-21.png
+
+Set the number of required network adapters, for example **4**.
+
+.. figure:: /_static/images/gns3-215.png
+
+**Advanced** settings tab: Mark the checkbox **Use as a linked
+base VM** and click ``OK`` to save the changes.
+
+.. figure:: /_static/images/gns3-22.png
+
+The VyOS VM is now ready to be deployed.
+