Troubleshooting, Image capturing of VM

Question

I am trying to capture image of a vm and save it into gallery and getting this error any assistance please??

Answer 1

Hello Varshney, Aayushi, the 400 Bad Request error typically indicates that some parameter passed to the az sig image-version create command is either invalid, malformed, or missing. In your case, based on the verbose part of the URL, --sku ""v1.0"" is invalid — double quotes inside double quotes.

It should be --sku v1 or any non-empty string without special quotes. Also managed image $IMAGE_NAME is not found or incorrectly referenced. You need to reference either a managed image resource ID or an existing VM name (if using --source)

or you might have incorrect --hyper-v-generation vs source image compatibility i.e. if you have set --hyper-v-generation V2 but your source image is V1 or doesn’t support secure boot.

Please reference from the below steps and let me know

az vm create \

  --resource-group arkorg \

  --name mySourceVM \

  --image Canonical:UbuntuServer:18_04-lts-gen1:latest \

  --size Standard_D2s_v3 \

  --admin-username azureuser \

  --generate-ssh-keys \

  --security-type Standard \

  --enable-secure-boot false \

  --enable-vtpm false

Note- Only Gen1 images work here. Gen2 images often cause SecureBootClientError if they are unsigned. You can list Gen1 images using-

az vm image list \

  --publisher Canonical \

  --offer UbuntuServer \

  --sku 18_04-lts \

  --all \

  --location westeurope \

  --output table

Generalize the VM

az vm deallocate --resource-group arkorg --name whatever_is_ur_vm_name

az vm generalize --resource-group arkorg --name whatever_is_ur_vm_name

Create a shared image gallery & definition

az sig create \

  --resource-group arkorg \

  --gallery-name myGallery

az sig image-definition create \

  --resource-group arkorg \

  --gallery-name myGallery \

  --gallery-image-definition myImageDef \

  --publisher myPublisher \

  --offer UbuntuServer \

  --sku v1 \

  --os-type Linux \

  --os-state Generalized \

  --hyper-v-generation V1

Please note- default is Gen2 with TrustedLaunch. Use --hyper-v-generation V1 explicitly and omit security flags if using az sig image-definition.

Create an image version from the generalized VM

az sig image-version create \

  --resource-group arkorg \

  --gallery-name myGallery \

  --gallery-image-definition myImageDef \

  --gallery-image-version 1.0.0 \

  --managed-image /subscriptions/<SUB_ID>/resourceGroups/arkorg/providers/Microsoft.Compute/images/myManagedImage

Alternatively, if you're using a VM directly the run this-

az sig image-version create \

  --resource-group arkorg \

  --gallery-name myGallery \

  --gallery-image-definition myImageDef \

  --gallery-image-version 1.0.0 \

  --source mySourceVM

Reference MS documents-

• https://learn.microsoft.com/en-us/azure/virtual-machines/shared-image-galleries?tabs=vmsource%2Cazure-cli
• https://learn.microsoft.com/en-us/cli/azure/sig/image-definition?view=azure-cli-latest

Answer 2

Hi Varshney, Aayushi, thank you for posting your question on the Q&A portal regarding the VM image capture issue. The error you encountered ("Bad Request") often occurs due to misconfigured parameters or syntax issues in the Azure CLI command.

For troubleshooting, ensure:

• The IMAGE_DEFINITION variable is correctly referenced in the image-version create command.

The VM is generalized (using sudo waagent -deprovision+user for Linux) before capturing.

Capture a VM image using Azure CLI

Let me know if you need further clarification!

Best regards,
Alex
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