AKS Vertical Scaling

Question

We had a AKS cluster with 4 Node pool and we scale one node pool vertically. After scaling we are facing issues with the AGW not picking the backend endpoints and Backend health is unhealthy.

I read this https://github.com/Azure/AKS/issues/1556#issuecomment-615390245 and I would like to know if we delete the vertically scaled node pool and recreate it with previous VM size or new VM size will it solve the issue?

Thank you

Answer 1

Hello @Mohamed Iflan ,
Thanks for reaching out to Microsoft QnA.
Could you please clarify if you want to add extra node to the nodepool, or do you want to change the sku of the nodes in the nodepool?
For the first scenario, you cannot change the VM sku size of a node pool after you create it. To change the VM sku size, as mentioned above, you will have to recreate the nodepool with the desired VM size and delete the nodepool with the older size.

For the second scenario, when you want to scale a nodepool manually (adding more noded to the existing nodepool), you can use the az aks nodepool scale command as mentioned in this document - Scale a nodepool manually.

Hope this clarifies your question. To understand why the AGW is not picking the backend endpoints, please let me know which is your scenario. I will await your response. Please do tag me in your reply. Thank you.

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