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 Hyper-V virtualization platform

It is possible to use Hyper-V as a compute node within an OpenStack Deployment. The nova-compute service runs as "openstack-compute," a 32-bit service directly upon the Windows platform with the Hyper-V role enabled. The necessary Python components as well as the nova-compute service are installed directly onto the Windows platform. Windows Clustering Services are not needed for functionality within the OpenStack infrastructure. The use of the Windows Server 2012 platform is recommend for the best experience and is the platform for active development. The following Windows platforms have been tested as compute nodes:

  • Windows Server 2008 R2

    Both Server and Server Core with the Hyper-V role enabled (Shared Nothing Live migration is not supported using 2008 R2)

  • Windows Server 2012 and Windows Server 2012 R2

    Server and Core (with the Hyper-V role enabled), and Hyper-V Server

 Hyper-V configuration

The only OpenStack services required on a Hyper-V node are nova-compute and neutron-hyperv-agent. Regarding the resources needed for this host you have to consider that Hyper-V will require 16 GB - 20 GB of disk space for the OS itself, including updates. Two NICs are required, one connected to the management network and one to the guest data network.

The following sections discuss how to prepare the Windows Hyper-V node for operation as an OpenStack compute node. Unless stated otherwise, any configuration information should work for the Windows 2008 R2, 2012 and 2012 R2 platforms.

 Local storage considerations

The Hyper-V compute node needs to have ample storage for storing the virtual machine images running on the compute nodes. You may use a single volume for all, or partition it into an OS volume and VM volume. It is up to the individual deploying to decide.

 Configure NTP

Network time services must be configured to ensure proper operation of the OpenStack nodes. To set network time on your Windows host you must run the following commands:

C:\>net stop w32time
C:\>w32tm /config /,0x8 /syncfromflags:MANUAL
C:\>net start w32time

Keep in mind that the node will have to be time synchronized with the other nodes of your OpenStack environment, so it is important to use the same NTP server. Note that in case of an Active Directory environment, you may do this only for the AD Domain Controller.

 Configure Hyper-V virtual switching

Information regarding the Hyper-V virtual Switch can be located here:

To quickly enable an interface to be used as a Virtual Interface the following PowerShell may be used:

PS C:\>$if = Get-NetIPAddress -IPAddress 192* | Get-NetIPInterface
PS C:\>New-VMSwitch -NetAdapterName $if.ifAlias -Name YOUR_BRIDGE_NAME -AllowManagementOS $false

It is very important to make sure that when you are using an Hyper-V node with only 1 NIC the -AllowManagementOS option is set on True, otherwise you will lose connectivity to the Hyper-V node.

 Enable iSCSI initiator service

To prepare the Hyper-V node to be able to attach to volumes provided by cinder you must first make sure the Windows iSCSI initiator service is running and started automatically.

PS C:\>Set-Service -Name MSiSCSI -StartupType Automatic
PS C:\>Start-Service MSiSCSI
 Configure shared nothing live migration

Detailed information on the configuration of live migration can be found here:

The following outlines the steps of shared nothing live migration.

  1. The target hosts ensures that live migration is enabled and properly configured in Hyper-V.

  2. The target hosts checks if the image to be migrated requires a base VHD and pulls it from the Image Service if not already available on the target host.

  3. The source hosts ensures that live migration is enabled and properly configured in Hyper-V.

  4. The source hosts initiates a Hyper-V live migration.

  5. The source hosts communicates to the manager the outcome of the operation.

The following two configuration options/flags are needed in order to support Hyper-V live migration and must be added to your nova.conf on the Hyper-V compute node:

  • instances_shared_storage = False

    This needed to support "shared nothing" Hyper-V live migrations. It is used in nova/compute/

  • limit_cpu_features = True

    This flag is needed to support live migration to hosts with different CPU features. This flag is checked during instance creation in order to limit the CPU features used by the VM.


Additional Requirements:

  • Hyper-V 2012 R2 or Windows Server 2012 R2 with Hyper-V role enabled

  • A Windows domain controller with the Hyper-V compute nodes as domain members

  • The instances_path command-line option/flag needs to be the same on all hosts.

  • The openstack-compute service deployed with the setup must run with domain credentials. You can set the service credentials with:

    C:\>sc config openstack-compute obj="DOMAIN\username" password="password"

How to setup live migration on Hyper-V

To enable 'shared nothing live' migration, run the 3 PowerShell instructions below on each Hyper-V host:

PS C:\>Enable-VMMigration
PS C:\>Set-VMMigrationNetwork IP_ADDRESS
PS C:\>Set-VMHost -VirtualMachineMigrationAuthenticationTypeKerberos

Please replace the IP_ADDRESS with the address of the interface which will provide live migration.

Additional Reading

Here's an article that clarifies the various live migration options in Hyper-V:

 Install nova-compute using OpenStack Hyper-V installer

In case you want to avoid all the manual setup, you can use Cloudbase Solutions' installer. You can find it here:

It installs an independent Python environment, in order to avoid conflicts with existing applications, generates dynamically a nova.conf file based on the parameters provided by you.

The installer can also be used for an automated and unattended mode for deployments on a massive number of servers. More details about how to use the installer and its features can be found here:



Python 2.7 32bit must be installed as most of the libraries are not working properly on the 64bit version.


Procedure 2.2. Setting up Python prerequisites

  1. Download and then install it using the MSI installer from here:

    PS C:\> $src = “”
    PS C:\> $dest = “$env:temp\python-2.7.3.msi”
    PS C:\> Invoke-WebRequest –Uri $src –OutFile $dest
    PS C:\> Unblock-File $dest
    PS C:\> Start-Process $dest
  2. Make sure that the Python and Python\Scripts paths are set up in the PATH environment variable.

    PS C:\>$oldPath = [System.Environment]::GetEnvironmentVariable("Path")
    PS C:\>$newPath = $oldPath + ";C:\python27\;C:\python27\Scripts\"
    PS C:\>[System.Environment]::SetEnvironmentVariable("Path", $newPath, [System.EnvironmentVariableTarget]::User
 Python dependencies

The following packages need to be downloaded and manually installed:

The following packages must be installed with pip:

  • ecdsa

  • amqp

  • wmi

PS C:\> pip install ecdsa
PS C:\> pip install amqp
PS C:\> pip install wmi
 Other dependencies

qemu-img is required for some of the image related operations. You can get it from here: You must make sure that the qemu-img path is set in the PATH environment variable.

Some Python packages need to be compiled, so you may use MinGW or Visual Studio. You can get MinGW from here: You must configure which compiler to be used for this purpose by using the distutils.cfg file in $Python27\Lib\distutils, which can contain:

compiler = mingw32

As a last step for setting up MinGW, make sure that the MinGW binaries' directories are set up in PATH.

 Install Nova-compute

 Download the nova code
  1. Use Git to download the necessary source code. The installer to run Git on Windows can be downloaded here:

  2. Download the installer. Once the download is complete, run the installer and follow the prompts in the installation wizard. The default should be acceptable for the needs of the document.

    PS C:\>$src = “”
    PS C:\>$dest = “$env:temp\Git-1.9.2-preview20140411.exe”
    PS C:\>Invoke-WebRequest –Uri $src –OutFile $dest
    PS C:\>Unblock-File $dest
    PS C:\>Start-Process $dest
  3. Run the following to clone the Nova code.

    PS C:\>git.exe clone
 Install nova-compute service

To install Nova-compute, run:

PS C:\>cd c:\Nova
PS C:\>python install
 Configure nova-compute

The nova.conf file must be placed in C:\etc\nova for running OpenStack on Hyper-V. Below is a sample nova.conf for Windows:

auth_strategy = keystone
image_service = nova.image.glance.GlanceImageService
compute_driver = nova.virt.hyperv.driver.HyperVDriver
volume_api_class = nova.volume.cinder.API
fake_network = true
instances_path = C:\Program Files (x86)\OpenStack\Instances
glance_api_servers = IP_ADDRESS:9292
use_cow_images = true
force_config_drive = false
injected_network_template = C:\Program Files (x86)\OpenStack\Nova\etc\interfaces.template
policy_file = C:\Program Files (x86)\OpenStack\Nova\etc\policy.json
mkisofs_cmd = C:\Program Files (x86)\OpenStack\Nova\bin\mkisofs.exe
verbose = false
allow_resize_to_same_host = true
running_deleted_instance_action = reap
running_deleted_instance_poll_interval = 120
resize_confirm_window = 5
resume_guests_state_on_host_boot = true
rpc_response_timeout = 1800
lock_path = C:\Program Files (x86)\OpenStack\Log\
rpc_backend = nova.openstack.common.rpc.impl_kombu
rabbit_host = IP_ADDRESS
rabbit_port = 5672
rabbit_userid = guest
rabbit_password = Passw0rd
logdir = C:\Program Files (x86)\OpenStack\Log\
logfile = nova-compute.log
instance_usage_audit = true
instance_usage_audit_period = hour
network_api_class =
neutron_url = http://IP_ADDRESS:9696
neutron_auth_strategy = keystone
neutron_admin_tenant_name = service
neutron_admin_username = neutron
neutron_admin_password = Passw0rd
neutron_admin_auth_url = http://IP_ADDRESS:35357/v2.0
vswitch_name = newVSwitch0
limit_cpu_features = false
config_drive_inject_password = false
qemu_img_cmd = C:\Program Files (x86)\OpenStack\Nova\bin\qemu-img.exe
config_drive_cdrom = true
dynamic_memory_ratio = 1
enable_instance_metrics_collection = true
enabled = true
html5_proxy_base_url = https://IP_ADDRESS:4430

Table 2.31, “Description of HyperV configuration options” contains a reference of all options for hyper-v.

 Prepare images for use with Hyper-V

Hyper-V currently supports only the VHD and VHDX file format for virtual machine instances. Detailed instructions for installing virtual machines on Hyper-V can be found here:

Once you have successfully created a virtual machine, you can then upload the image to glance using the native glance-client:

PS C:\>glance image-create --name "VM_IMAGE_NAME" --is-public False --container-format bare --disk-format vhd

VHD and VHDX files sizes can be bigger than their maximum internal size, as such you need to boot instances using a flavor with a slightly bigger disk size than the internal size of the disk file. To create VHDs, use the following PowerShell cmdlet:

PS C:\>New-VHD DISK_NAME.vhd -SizeBytes VHD_SIZE
 Run Compute with Hyper-V

To start the nova-compute service, run this command from a console in the Windows server:

PS C:\>C:\Python27\python.exe c:\Python27\Scripts\nova-compute --config-file c:\etc\nova\nova.conf

 Troubleshoot Hyper-V configuration

  • I ran the nova-manage service list command from my controller; however, I'm not seeing smiley faces for Hyper-V compute nodes, what do I do?

    Verify that you are synchronized with a network time source. For instructions about how to configure NTP on your Hyper-V compute node, see the section called “Configure NTP”.

  • How do I restart the compute service?

    PS C:\>net stop nova-compute && net start nova-compute
  • How do I restart the iSCSI initiator service?

    PS C:\>net stop msiscsi && net start msiscsi
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