How to reference virtual machine name of VMSS in JSON template - json

Question

Is there a way to reference a VM name that is deployed in VM Scale Set? I'm using custom script extension that runs install script when each VM in scale set is deployed and for one of the parameters of the script I want to use a name of the VM. For single instance it was easy:
"commandToExecute": "[concat('sh ap-cluster-setup.sh -h=',parameters('virtualMachineName'),' -s=',parameters('subnetAddressPrefix'),'')]"
but since VM name in scale set is created dynamically when it is deployed I can't think of a way to reference it in JSON. The VM naming convention is vmssTemplate_0, vmssTemplate_1, etc. where vmssTemplate is parameters('virtualMachineScaleSets_name') in VMSS template.

Answer 1

There's no way to do this in the template itself since the same parameters get passed to each VM on script execution. However, You should be able to figure out the VM name from within the script. For instance, on a Linux machine you could use the hostname command, which will return the VM name. Does this meet your needs?

Answer 2

where vmssTemplate is parameters('virtualMachineScaleSets_name') in
VMSS template.
We can find where vmss template define the Virtual machine's name.
computernameprefix:
"osProfile": {
"computerNamePrefix": "[variables('namingInfix')]",
"adminUsername": "[parameters('adminUsername')]",
"adminPassword": "[parameters('adminPassword')]"
},
and the 'namingInfix' define here:
"namingInfix": "[toLower(substring(concat(parameters('vmssName'), uniqueString(resourceGroup().id)), 1, 9))]",
By default the VMSS with autoscale settings, and the vm's name should be create automatically.
If you want to get the VMs' name, we can use powershell to get it:
PS C:\windows> Get-AzureRmVmssVM -ResourceGroupName YOUR_RESOURCE_NAME -VMScaleSetName YOUR_VMSS_NAME
Also you can add some script (to get the name of your VMs) in your script, then upload the script to custom script extension.