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Ubuntu virtual machines on Hyper-V

Updated: December 12, 2014

Applies To: Hyper-V Server 2012, Hyper-V Server 2012 R2, Microsoft Hyper-V Server Technical Preview, Windows 10 Technical Preview, Windows 8, Windows 8.1, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, Windows Server Technical Preview



The following feature distribution map indicates the features in each version. The known issues and workarounds for each distribution are listed after the table.

Table legend

  • Built in – LIS are included as part of this Linux distribution. The Microsoft-provided LIS download package does not work for this distribution, so do not install it. The kernel module version numbers for the built in LIS (as shown by lsmod, for example) are different from the version number on the Microsoft-provided LIS download package. A mismatch does not indicate that the built in LIS is out of date.

  • - Feature available

  • (blank) - Feature not available

 

Feature

Windows Server operating system version

14.10

14.04

13.10

13.04

12.10

12.04

Availability

Built-in

Built-in

Built-in

Built-in

Built-in

Built-in

Core

2012 R2, 2012, 2008 R2

Networking

Jumbo frames

2012 R2, 2012, 2008 R2

VLAN tagging and trunking

2012 R2, 2012, 2008 R2

Live migration

2012 R2, 2012, 2008 R2

Static IP Injection

2012 R2, 2012

Note 1

Note 1

Note 1

Note 1

Note 1

Note 1

vRSS

2012 R2

TCP Segmentation and Checksum Offloads

2012 R2, 2012, 2008 R2

Storage

VHDX resize

2012 R2

Virtual Fibre Channel

2012 R2

Note 2

Note 2

Note 2

Live virtual machine backup

2012 R2

Note 3, 4, 5, 12

Note 3, 4, 5, 12

Note 3, 4, 5, 12

TRIM support

2012 R2

Memory

Configuration of MMIO gap

2012 R2

Dynamic Memory – Hot Add

2012 R2, 2012

Note 6, 7, 8

Note 6, 7, 8

Note 6, 7, 8

Dynamic Memory – Ballooning

2012 R2, 2012

Note 6, 7, 8

Note 6, 7, 8

Note 6, 7, 8

Video

Hyper-V specific video device

2012 R2, 2012, 2008 R2

Miscellaneous

Key/value pair

2012 R2, 2012, 2008 R2

Note 5, 9

Note 5, 9

Note 5, 9

Note 5, 9

Note 5, 9

Note 5, 9

Non-Maskable Interrupt

2012 R2

PAE Kernel Support

2012 R2, 2012, 2008 R2

File copy from host to guest

2012 R2

Generation 2 virtual machines

Boot using UEFI

2012 R2

Note 10, 11

Note 10, 11

Secure boot

2012 R2

noteNote
  1. Static IP injection may not work if Network Manager has been configured for a given Hyper-V-specific network adapter on the virtual machine. To ensure smooth functioning of static IP injection please ensure that Network Manager is turned off completely or has been turned off for a specific network adapter through its ifcfg-ethX file.

  2. While using virtual fiber channel devices, ensure that logical unit number 0 (LUN 0) has been populated. If LUN 0 has not been populated, a Linux virtual machine might not be able to mount fiber channel devices natively.

  3. If there are open file handles during a live virtual machine backup operation, then in some corner cases, the backed-up VHDs might have to undergo a file system consistency check (fsck) on restore.

  4. Live backup operations can fail silently if the virtual machine has an attached iSCSI device or direct-attached storage (also known as a pass-through disk).

  5. The following daemons must be installed manually for Ubuntu distributions:

    • VSS Snapshot daemon – This daemon is required to create live Linux virtual machine backups.

    • KVP daemon – This daemon allows setting and querying intrinsic and extrinsic key value pairs.

    To install both daemons, please use the following command:

    
    # sudo apt-get update
    # sudo apt-get install hv-kvp-daemon-init
    # uname –r 
    <kernel release>
    # sudo apt-get install linux-tool-<kernel release>
    # sudo apt-get install linux-cloud-tools-<kernel release>
    
    
  6. Dynamic memory support is only available on 64-bit virtual machines.

  7. Dynamic Memory operations can fail if the guest operating system is running too low on memory. The following are some best practices:

    • Startup memory and minimal memory should be equal to or greater than the amount of memory that the distribution vendor recommends.

    • Applications that tend to consume the entire available memory on a system are limited to consuming up to 80 percent of available RAM.

  8. If you are using Dynamic Memory on Windows Server 2012 operating systems, specify Startup memory, Minimum memory, and Maximum memory parameters in multiples of 128 megabytes (MB). Failure to do so can lead to Hot-Add failures, and you might not see any memory increase on a guest operating system.

  9. In Windows Server 2012 R2, the key/value pair infrastructure might not function correctly without a Linux software update. Contact your distribution vendor to obtain the software update in case you see problems with this feature.

  10. Generation 2 virtual machines have secure boot enabled by default and Generation 2 Linux virtual machines will not boot unless the secure boot option is disabled. You can disable secure boot in the Firmware section of the settings for the virtual machine in Hyper-V Manager or you can disable it using Powershell:

    Set-VMFirmware –VMName "VMname" -EnableSecureBoot Off
    
  11. Before attempting to copy the VHD of an existing Generation 2 VHD virtual machine to create new Generation 2 virtual machines, follow these steps:

    1. Log in to the existing Generation 2 virtual machine.

    2. Change directory to the boot EFI directory:cd /boot/efi/EFI

    3. Copy the ubuntu directory in to a new directory named boot:sudo cp –r ubuntu/ boot

    4. Change directory to the newly created boot directory:cd boot

    5. Rename the shimx64.efi file:sudo mv shimx64.efi bootx64.efi

  12. Live virtual machine backup will not work with ext2 file systems. The default layout created by the Ubuntu installer includes ext2 file systems, so you must customize the layout to not create this file system type.

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