Not able to create vmss form compute gallery specialized image through azure cli

Abhayjit Kumar 0

I have a specialized image in compute gallery which i am passing as source image id while creating vmss, Error message: "admin user name cannot contain upper case character A-Z"
Cli command: "az vmss create -g abhay-dev-terraform-rg -n test-vmss --image /subscriptions//xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx/resourceGroups/Terraform_test/providers/Microsoft.Compute/galleries/terrafrom_gallery/images/image-definition-tf/versions/1.0.0 --specialized"

Since i already have set admin user and password so we are not passing it in cli.

anashetty 825 Reputation points Microsoft Vendor

2024-10-04T06:58:16.5533333+00:00

Hi Abhayjit Kumar,

Welcome to the Microsoft Q&A Platform. Thank you for posting your query here. We are looking into it and will get back to you soon.

Thank you.
anashetty 825 Reputation points Microsoft Vendor

2024-10-04T10:17:53.7466667+00:00

Hi Abhayjit Kumar,

Based on the error details you shared, I have shared troubleshooting steps that I felt will help resolve the issue you reported.

It seems that the original VM from which the specialized image was created had an admin username that contains uppercase letters, which is causing this error. With specialized images, Azure uses the exact credentials (admin username and password) from the original VM.

Fix the Source VM Before Creating the Specialized Image: If the admin username in that source VM is incorrect, you will need to go back to the original VM. Change the admin username to a compliant one (using tools like Azure Run Command, or by manually modifying it within the OS if possible). Create a new specialized image from that VM.

For Alternative, if recreating the specialized image is not an option, you can switch to using a generalized image. With a generalized image, you'll be prompted to set a new admin username and password during the VMSS creation, allowing you to bypass this issue.

https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/instance-generalized-image-version?tabs=cli%2Ccli2

Please let us know if you have any further queries. I’m happy to assist you further.
Abhayjit Kumar 0 Reputation points

2024-10-04T11:37:38.6133333+00:00

Hi anashetty, in the source vm the user name is in samll case only (azureuser). While doing it form ui we are able to do this configuration and also able to login to the newly provisioned vm form vmss.
anashetty 825 Reputation points Microsoft Vendor

2024-10-08T01:56:13.7533333+00:00

Hi Abhayjit Kumar,

Just checking in to see if you had a chance to see my response to your question. Please tell us if it was helpful and feel free to reach out to us if you have any queries.

Thank you.

1 answer

anashetty 825 Reputation points Microsoft Vendor

2024-10-07T08:55:26.5566667+00:00
Hi Abhayjit Kumar,

Try creating the VMSS using a specialized image by not specifying a new admin username.

az vmss create \ -g <resource-group> \ -n <vmss-name> \ --image <image-id> \ --specialized

If the error persists, try using --debug in your CLI command to get more detailed logs about the failure.

az vmss create \ -g abhay-dev-terraform-rg \ -n test-vmss \ --image /subscriptions/xxxxxxx-xxxx-xxxx-xxxx-xxxxxxxxx/resourceGroups/Terraform_test/providers/Microsoft.Compute/galleries/terrafrom_gallery/images/image-definition-tf/versions/1.0.0 \ --specialized \ --debug

Make sure you are using the latest version of the Azure CLI. You can update it using:

sudo apt-get update sudo apt-get install --only-upgrade -y azure-cli

Please try above steps, if you still find any difficulties, please share more details on the issue so that we can assist you further on this.
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anashetty 825 Reputation points Microsoft Vendor

2024-10-09T02:37:05.06+00:00

Hi Abhayjit Kumar,

I hope you're doing well. I just wanted to follow up on our previous conversation and ask if the response I provided was helpful to you.

If you have any further queries, do let us know.

If the answer is helpful, please click "Accept Answer" and "Upvote it."
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Not able to create vmss form compute gallery specialized image through azure cli

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