ARM template error

Ernest Hedgepeth 0

I'm attempting to automate Azure vnet deployments using an ARM template and Powershell script. The problem appears to be with the copy/copyIndex loop for subnet creation. I can't figure out how to resolve the error. Please find the error message below for the template files that is attached. Help Please!!! test_json.txt

New-AzResourceGroupDeployment : 5:46:56 PM - The deployment 'test' failed with error(s). Showing 1 out of 1 error(s).

Status Message: Unable to process template language expressions for resource

'/subscriptions/RemovedSubscriptionId/resourceGroups/RG-AZNetworkAutomation/providers/Microsoft.Network/virtualNetworks/ernest_vnet0' at line '45'

and column '9'. 'The template language function 'copyIndex' has an invalid argument. The provided copy name 'subnetCopy' doesn't exist in the resource. Please see

https://aka.ms/arm-resource-loops for usage details.' (Code:InvalidTemplate)

CorrelationId: b0f0c1bd-db69-4e8f-976c-89a35433608a

At C:\Users\Ernest\Documents\Azure\AZ104_Study\test_deploy.ps1:45 char:1

New-AzResourceGroupDeployment -ResourceGroupName RG-AZNetworkAtomatio ...


    + CategoryInfo          : NotSpecified: (:) [New-AzResourceGroupDeployment], Exception

    + FullyQualifiedErrorId : Microsoft.Azure.Commands.ResourceManager.Cmdlets.Implementation.NewAzureResourceGroupDeploymentCmdlet

hossein jalilian 8,155 Reputation points

2024-08-06T22:22:49.56+00:00
Thanks for posting your question in the Microsoft Q&A forum.

When calling the deployment script, ensure you're passing the correct parameters:

New-AzResourceGroupDeployment ` -ResourceGroupName "RG-AZNetworkAutomation" ` -TemplateFile "path/to/your/template.json" ` -vnetName "ernest_vnet0" ` -location "eastus" ` -vnetAddressPrefix @("10.0.0.0/16") ` -subnets @( @{name="subnet1"; addressPrefix="10.0.1.0/24"}, @{name="subnet2"; addressPrefix="10.0.2.0/24"} )

This structure should resolve the error you're encountering with the copyIndex function

Please don't forget to close up the thread here by upvoting and accept it as an answer if it is helpful

Ernest Hedgepeth 0

Hi Hossein and thank you for your response. I'm using a PowerShell script that prompts the user to input the parameters that populate the parameters file. Below is the parameter file that was used when deploying the template that generated the error.

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
      "vnetLocation": {
        "value": "eastus"
      },
      "vnetCount": {
        "value": 6
      },
      "vnetNamePrefix": {
        "value": "ernest_vnet"
      },
      "vnetAddressSpacePrefix": {
        "value": "10.0"
      },
      "subnetCount": {
        "value": 2
      },
      "subnetNamePrefix": {
        "value": "subnet"
      }
    }
  }

KapilAnanth-MSFT 47,201 Reputation points Microsoft Employee

2024-08-26T14:10:35.6466667+00:00

@Ernest Hedgepeth ,

Welcome to the Microsoft Q&A Platform. Thank you for reaching out & I hope you are doing well.

I understand that you would like to use Nested Copy function in ARM template.

Unfortunately, You can't use a copy loop for a child resource.

See : Iteration for a child resource

Instead, I would suggest you create the VNET and the subnets individually

Cheers,

Kapil

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