While updating image reference, portal shows “No existing galleries in subscription"

Hey Anil, it looks like when you hit “Change image reference” your subscription simply doesn’t have any Shared Image Galleries (SIGs) in it (or you haven’t been granted access to the central Project ST0002 gallery yet), so the portal shows “No existing galleries in subscription.”

Here’s what you can do to get yourself onboarded and see the gallery images:

Register the Compute resource provider • Go to Azure Portal → Subscriptions → your subscription → Resource providers • Find “Microsoft.Compute” in the list and click Register • Wait a minute or two until its status turns “Registered.”

If you already have a central (1P) gallery in another subscription: a. In the gallery-owning subscription, browse to the Shared Image Gallery (Project ST0002). b. Under “Access control (IAM)” or the “Sharing” blade, add your target subscription as a sharing destination. – Choose “Subscriptions,” enter your subscription ID, and grant at least the Reader role. c. Save. This makes that gallery visible to your subscription.

If you need to create a new gallery in your subscription instead: • In the portal search box type “Shared Image Galleries” → + Add • Fill in Name, Resource Group, Regions, etc. → Review + Create • Define your image definitions and versions once the gallery is up.

In your subscription, double-check RBAC: • Go to Subscriptions → your subscription → Access control (IAM) • Verify you (and whoever is doing the VMSS update) have at least Reader on the SIG resource (or the RG that contains it).

Retry the VMSS image-change flow:

VMSS > Operating system > Change image reference > under “My Shared Images” you should now see the gallery.

If after doing the above steps you still see “No existing galleries,” please let me know:

• Do you already have a SIG in another subscription? If so, which subscription/management group is hosting it?
• Are you the gallery owner or a consumer?
• Do you have Owner/Contributor or at least Reader permissions on the SIG resource?

References you can include in your forum post:

• Troubleshooting Shared Image Galleries: https://learn.microsoft.com/azure/virtual-machines/troubleshooting-shared-images
• Overview & create SIG: https://learn.microsoft.com/azure/virtual-machines/shared-image-galleries
• Azure CLI SIG commands: https://learn.microsoft.com/cli/azure/sig

Anil Mekala (INFOSYS LIMITED) hi,

portal message just means this subscription does not currently have a visible Azure Compute Gallery resource that the VMSS blade can use. “Onboard to 1P Image Gallery” sounds like an internal Microsoft image publishing process, not something u fix from the VMSS page.

If u are moving from a Marketplace WS2022 .NET 6 image to a newer Marketplace image, u probably do not need Azure Compute Gallery at all. Update the VMSS imageReference to a supported Marketplace image instead. VMSS image references can be updated by modifying imageReference https://learn.microsoft.com/en-us/azure/virtual-machine-scale-sets/virtual-machine-scale-sets-upgrade-scale-set

If the target image is a custom or internal company image, create or use an Azure Compute Gallery in the same tenant or subscription, publish the image version there, replicate it to the VMSS region, then update the VMSS to use the gallery image version ID. https://learn.microsoft.com/en-us/azure/virtual-machines/azure-compute-gallery

For the portal issue, see if that the gallery exists in the same subscription selected in the portal, the user has Reader access to the gallery, and the image version is replicated to the VMSS region. If the gallery is in another subscription, portal discovery may not show it cleanly, use the full image version resource ID with CLI, Bicep or ARM instead.

If this is a Microsoft internal “1P Image Gallery” requirement, raise it through the internal image onboarding process or the team that owns ST0002 images. Public Azure support cannot onboard a subscription to Microsoft 1P gallery from Q&A.

Decide whether target is Marketplace image or custom gallery image. For Marketplace, update imageReference. For custom/internal image, publish it to Azure Compute Gallery first, then point VMSS to the image version ID.

rgds,

Alex

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