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Add an existing VM to an Availability Set in Azure

July 20, 2020 by AJNI No Comments

Normally, adding an Availability Set after the VM has been deployed is not possible. You would have to delete the VM, leaving the NIC and OS disk intact and then re-creating the VM with the Availability Set. Of course that can be done manually, but there is a PowerShell script that does this all for us.

This can be all done in the Azure Cloud Shell, you do not have to install the PowerShell Module on a Windows Machine.

Install-Module AzureRm.AvailabilitySetManagement

Create an AS before adding the VM to the AS.

New-AzureRmAvailabilitySet -Location "West Europe" -Name "myAs" -ResourceGroupName "myRg" -Sku aligned -PlatformFaultDomainCount 3 -PlatformUpdateDomainCount 5

Now add the VM to the AS:

Add-AzureRmAvSetVmToAvailabilitySet -ResourceGroupName "myRg" -VMName "VM01" -OsType windows -AvailabilitySet "myAs"

This will stop the VM if it is running, delete the VM item (leaving the NIC and OS disk intact) and re-create that with the same VM size inside the newly created Availability Set.

References:

https://pixelrobots.co.uk/2018/02/add-existing-virtual-machine-availability-set-azure/

https://gist.github.com/PixelRobots/3c34027d225c7acb09833840b7258ee9#file-movevmavaset-ps1

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