How can I enable nested virtualization for a Ubuntu VM which I created in Azure?

Question

I have create a VM of Ubuntu 20.04. I want to enable nested virtualization, which I am not able to to do. I am using the Standard D2s v3 (2 vcpus, 8 GiB memory) which supports nested virtualization. I have also selected the US central which supports nested virtualization.

When I am try to do it via Azure cli it gives error

az vm update --resource-group oaitest --name oai --set "additionalCapabilities.enableNestedVirtualization=true"
Property 'enableNestedVirtualization' not found on additionalCapabilities. Send it as an additional property .
(BadRequest) Could not find member 'enableNestedVirtualization' on object of type 'AdditionalCapabilities'. Path 'properties.additionalCapabilities.enableNestedVirtualization', line 1, position 628.
Code: BadRequest
Message: Could not find member 'enableNestedVirtualization' on object of type 'AdditionalCapabilities'. Path 'properties.additionalCapabilities.enableNestedVirtualization', line 1, position 628.
Target: vm.properties.additionalCapabilities.enableNestedVirtualization

Answer 1

Thanks for posting your question in the Microsoft Q&A forum.

Nested virtualization is already enabled by default on Ubuntu VMs in Azure, including Ubuntu 20.04. You don't need to manually enable it for your Ubuntu VM. To verify if nested virtualization is enabled, you can follow these steps:

Connect to your Ubuntu VM using SSH, run the following command to check if the required kernel module is loaded:

lsmod | grep -i kvm

cat /sys/module/kvm_intel/parameters/nested

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Answer 2

Hi Faheem Awan

I am unable to see the o/p on the above message. Can you share a screenshot of it?

If you are trying this from scratch, this might help https://brianlinkletter.com/2018/06/create-a-nested-virtual-machine-in-a-microsoft-azure-linux-vm/