How do I update my azure virtual machine scale sets from Redhat 8.4 to 8.10 and How to take the backup f virtual machine scale sets and restore proceedure

@Abhishek _If you use Azure platform images, you can update the image by modifying the imageReference. Examples from the documentation here:

Update-AzVmss -ResourceGroupName "myResourceGroup" -VMScaleSetName "myScaleSet" -ImageReferenceVersion 16.04.201801090 az vmss update --resource-group myResourceGroup --name myScaleSet --set virtualMachineProfile.storageProfile.imageReference.version=16.04.201801090

If you are using a custom image you will need to first update the OS to 8.10, see RHEL instructions. After updating the OS, create a new image. You can then update the VMSS to utilize this new image. You can change the image your scale set uses by updating the image reference ID property. The image reference ID property is not part of a list, so you can directly modify this property with one of the following commands:

Update-AzVmss -ResourceGroupName "myResourceGroup" -VMScaleSetName "myScaleSet" -ImageReferenceId /subscriptions/{subscriptionID}/resourceGroups/myResourceGroup/providers/Microsoft.Compute/images/myNewImage

az vmss update --resource-group myResourceGroup --name myScaleSet --set virtualMachineProfile.storageProfile.imageReference.id=/subscriptions/{subscriptionID}/resourceGroups/myResourceGroup/providers/Microsoft.Compute/images/myNewImage

Backups are made of the individual VM and not the VMSS itself. If you need to restore a VMSS you can create a new one and select one of the previous snapshots as the source.

Hope this helps! Let me know if you have any questions or need further assistance.

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