When scaling virtual node groups in Azure Kubernetes Service (AKS), Ocean can fail to scale up new nodes for pending pods in specific zones. This typically occurs due to subscription-level restrictions on allowed instance types for specific zones.
- Identify which zones Ocean cannot scale up nodes.
- Verify the active data of the subscription by using the following API: Azure Resource Skus API.
- Review the API response for any instance type restrictions in specific zones. If an error such as subscription not allowed for specific instance types in specific zones appears, it indicates that restrictions are causing the failure.
- Update the subscription configuration to remove these restrictions by:
- Adding more instance types, or
- Allowing the missing instance type in the subscription.
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