ARM deployment fails with incorrect DSC extension template error - azure

Question

I have ARM deployment template, which contains VM resource with DSC extension
"resources": [
{
"name": "Microsoft.Powershell.DSC",
"type": "extensions",
"location": "[resourceGroup().location]",
"apiVersion": "2015-06-15",
"dependsOn": [
"[resourceId('Microsoft.Compute/virtualMachines', parameters('appVMName'))]"
],
"tags": {
"displayName": "appDSC"
},
"properties": {
"publisher": "Microsoft.Powershell",
"type": "DSC",
"typeHandlerVersion": "2.9",
"autoUpgradeMinorVersion": true,
"forceUpdateTag": "[parameters('appDSCUpdateTagVersion')]",
"settings": {
"configuration": {
"url": "[parameters('dscArchiveUrl')]",
"script": "appDSC.ps1",
"function": "Main"
},
"configurationArguments": {
"nodeName": "[parameters('appVMName')]",
"webDeployPackage": "[parameters('appWebPackage')]",
"backgroundServicePackage": "[parameters('backgroundServicePackage')]"
}
}
}
}
]
I managed to make this work for the first time I executed it, but now it responds with error:
15:37:17 - Resource Microsoft.Compute/virtualMachines 'Unique-InApp' failed with message '{
"status": "Failed",
"error": {
"code": "ResourceDeploymentFailure",
"message": "The resource operation completed with terminal provisioning state 'Failed'.",
"details": [
{
"code": "VMExtensionProvisioningError",
"message": "VM has reported a failure when processing extension 'Microsoft.Powershell.DSC'. Error message: \"The
DSC Extension received an incorrect input: Configuration.url requires that configuration.script is specified.\nPlease c
orrect the input and retry executing the extension.\"."
}
]
}
}'
As you can see, I obviously put script to configuration, but for some reason it is not recognized by ARM deployment script.
I suppose, this is just wrong error message and I have different problem, but without proper diagnostic information I am not able to understand it.
So what is the problem and how to fix it?

Answer 1

Looking at this example and at the schema seems like you are doing it wrong.
I don't see script or function properties for DSC extension, instead I see configurationFunction property, which supposedly takes a value similar to this:
ContosoWebsite.ps1\\ContosoWebsite
Second slash is used to escape the first one ;)