Need to create azure aks

Question

Need to create azure aks

Amit Hole 20

Hi,

Getting error

az aks create --resource-group ecommerce-resource-group --name ecommerce-aks-cluster --node-count 1 --node-vm-size Standard_B2s --enable-addons monitoring --generate-ssh-keys

(BadRequest) The VM size of Standard_B2s is not allowed in your subscription in location 'southindia'. The available VM sizes are 'standard_b16als_v2,standard_b16as_v2,standard_b16ls_v2,standard_b16s_v2,standard_b2als_v2,standard_b2as_v2,standard_b

Will you please help

Amit Hole 20 Reputation points

2026-10-05T09:57:36.3166667+00:00
S C:\WINDOWS\system32> az aks create --resource-group ecommerce-resource-group --name ecommerce-aks-cluster --node-count 1 --node-vm-size Standard_B2s_v2 --enable-addons monitoring --generate-ssh-keys

The behavior of this command has been altered by the following extension: aks-preview

The command failed with an unexpected error. Here is the traceback:

'NoneType' object has no attribute 'name'

Traceback (most recent call last):

File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\knack/cli.py", line 233, in invoke

File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/init.py", line 666, in execute

File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/init.py", line 734, in _run_jobs_serially

File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/init.py", line 703, in _run_job

File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/init.py", line 336, in call

File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/command_operation.py", line 111, in handler

File "C:\Users\Shubhangi.azure\cliextensions\aks-preview\azext_aks_preview_client_factory.py", line 31, in cf_managed_clusters

return get_container_service_client(cli_ctx).managed_clusters ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "C:\Users\Shubhangi.azure\cliextensions\aks-preview\azext_aks_preview_client_factory.py", line 23, in get_container_service_client

return get_mgmt_service_client(cli_ctx, CUSTOM_MGMT_AKS_PREVIEW, subscription_id=subscription_id) ^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^

File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/client_factory.py", line 83, in get_mgmt_service_client

File "D:\a_work\1\s\build_scripts\windows\artifacts\cli\Lib\site-packages\azure/cli/core/commands/client_factory.py", line 222, in _get_mgmt_service_client

AttributeError: 'NoneType' object has no attribute 'name'. Did you mean: 'ne'?

To check existing issues, please visit: https://github.com/Azure/azure-cli/issues

Answer accepted by question author

AI answer

Standard_B2s is blocked for AKS in this scenario. For AKS, system node pools might not be able to use VM sizes with fewer than 2 vCPUs and 4 GB memory, and AKS doesn't support B-series VMs for system node pools. Since az aks create creates the initial system node pool, Standard_B2s isn't a valid choice here.

Use one of these approaches:

Pick a supported VM size from the list returned for southindia.
- Your error already shows allowed sizes in the subscription and region.
- A B-series option from that allowed list such as standard_b2as_v2 may work if it satisfies the system pool requirements.
Check AKS-supported VM SKUs for the region before creating the cluster:

az aks list-vm-skus \
  --location southindia \
  --output jsonc

Check general VM SKU availability in the region:

az vm list-skus --location southindia --output table

Create the cluster with a supported size instead of Standard_B2s.

If cluster creation still fails after selecting a listed SKU, common causes are:

subscription quota limits
regional or zonal capacity restrictions
AKS restrictions on certain VM sizes

If no suitable SKU appears, review quota and regional availability. If creation fails with allocation or capacity errors, rerun az aks list-vm-skus and choose another SKU family or region.

AI-generated content may be incorrect. Read our transparency notes for more information.

1 additional answer

Your answer

Answer 1

The second issue you posted it because of an issue with the specific aks-preview version that you have installed.

You can run the below command to verify the version of the aks-preview extension that is installed with AZ CLI:

az extension list --output table

If you don't need this extension, you can remove it and then retry the command.

az extension remove --name aks-preview

If you do need the aks-preview extension, I would recommend that you install a more stable build of this preview extension (for e.g. 20.0.0b7) and then retry the commands.

az extension list-available --output table | grep aks-preview
az extension add --name aks-preview --version 20.0.0b7