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I've been trying to use Azure VMSS as my Application Gateway backend but I keep getting this message in my backend pool details page

Virtual machine scale set 'vmss-name' was added to this backend pool. Upgrade all the instances of 'vmss-name' for this change to work.

I don't know which part of the instance should I upgrade. I've tried using a custom image and the official Windows Server 2022 image. Can somebody tell me?

Thanks

Llyod
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1 Answers1

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It seems that when creating VMSS, we can choose our Upgrade policy under the Management tab. If we chose Manual upgrade mode, we need to manually upgrade our VMSS whenever we introduce a new scale set model. We can use this command in the CloudShell to manually update a VM in the VMSS.

Update-AzVmssInstance -ResourceGroupName "myResourceGroup" -VMScaleSetName "myScaleSet" -InstanceId instanceId

If we choose Automatic upgrade mode, our VMSS will automatically update itself whenever we introduce a new scale set model.

Please see the official documentation for further details.

Llyod
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