Time synchronisation with Ubuntu guest and Hyper-V Client (Windows 8)

Question

I have Ubuntu Server installed (quantal, 12.10, 32-bit), as a VM guest using Hyper-V with Windows 8.

Note I am using this on my laptop. When I re-open my laptop, the time is no longer synchronised with the VM.

How often does the time synchronisation process take? Is it possible to enforce it somehow?

I can see the following modules installed on Ubuntu: * hv_storvsc * hv_netvsc * hv_utils * hv_vmbus

I have time sync checked under "Synchronistaion services" in Hyper-V.

Note I don't want my VM to require internet access, so unfortunately using an Internet date sync server will not work.

Thanks

Answer 1

Install Microsoft's Linux Integration Services on the VM you are having issues with.

• Downloading the Linux Integration Components v2.1
• Mount the ISO in the VM
• Run these commands as root under the VM:

---

mkdir /mnt/cdrom
mount /dev/cdrom /mnt/cdrom
mkdir /linuxic
cp –R /mnt/cdrom/* /linuxic
cd /linuxic/
make
make install

• Reboot the VM

• Run this command under the VM as root to verify it worked

  /sbin/lsmod | grep vsc

Source: Installing Linux Integration Services v2.1 Hyper-V R2 On CentOS 5 (courtesy of the Internet archive's Wayback Machine).

Answer 2

According to Installing and Activating Hyper-V Linux Integration Services, Ubuntu has included Ubuntu Hyper-V Integration Services since 12.04. The article lists the steps to activate these services:

1. The first step is to edit the "modules" file located in /etc/initramfs-tools using this command:

   sudo vi /etc/initramfs-tools/modules
   

2. In vi Editor, navigate to the last line in the file and use the insert (I) command to append and enter the following lines:

   hv_vmbus
   hv_storvsc
   hv_blkvsc
   hv_netvsc
   

3. Save the file by hitting the Esc key and then issuing the ":x" command

4. Next, run the following command to re-initialize the "modules" file:

   sudo update-initramfs –u
   

5. Finally, reboot the virtual machine by executing the below command in Shell:

   sudo shutdown -r now
   

   Once the guest virtual machine is rebooted, the LIS drivers and services will be registered in the system.

Answer 3

I think Time Synchronization in Hyper-V may answer your questions.