How can I set dependencies on child resources in nested ARM template?-CodePudding

I am trying to use nested templates to deploy a resource group and multiple resources within it on subscription level.

Microsoft documentation has an example of deploying resource group and storage account that I'm trying to follow. I am trying to create another inner level of dependency between a Storage Account resource and a Container resource. That is, the container should only be deployed after the deployment of the storage account is finished. Here is simplified version of my template:

{
  "$schema": "https://schema.management.azure.com/schemas/2018-05-01/subscriptionDeploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "rgName": {
      "type": "string"
    },
    "rgLocation": {
      "type": "string"
    },
    "storagePrefix": {
      "type": "string",
      "maxLength": 11
    },
    "containerName": {
      "type": "string"
    }
  },
  "variables": {
    "storageName": "[concat(parameters('storagePrefix'), uniqueString(subscription().id, parameters('rgName')))]"
  },
  "resources": [
    {
      "type": "Microsoft.Resources/resourceGroups",
      "apiVersion": "2021-04-01",
      "name": "[parameters('rgName')]",
      "location": "[parameters('rgLocation')]",
      "properties": {}
    },
    {
      "type": "Microsoft.Resources/deployments",
      "apiVersion": "2021-04-01",
      "name": "storageDeployment",
      "resourceGroup": "[parameters('rgName')]",
      "dependsOn": [
        "[resourceId('Microsoft.Resources/resourceGroups/', parameters('rgName'))]"
      ],
      "properties": {
        "mode": "Incremental",
        "template": {
          "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
          "contentVersion": "1.0.0.0",
          "parameters": {},
          "variables": {},
          "resources": [
            {
              "type": "Microsoft.Storage/storageAccounts",
              "apiVersion": "2021-04-01",
              "name": "[variables('storageName')]",
              "location": "[parameters('rgLocation')]",
              "sku": {
                "name": "Standard_LRS"
              },
              "kind": "StorageV2"
            },
            {
              "type": "Microsoft.Storage/storageAccounts/blobServices/containers",
              "apiVersion": "2021-06-01",
              "name": "[format('{0}/default/{1}', variables('storageName'), parameters('containerName'))]",
              "dependsOn": [
                "[resourceId('Microsoft.Storage/storageAccounts', variables('storageName'))]"
              ]
            }
          ],
          "outputs": {}
        }
      }
    }
  ],
  "outputs": {}
}

When I try to deploy this template using PowerShell script New-AzSubscriptionDeployment, I get the following error:

|  InvalidTemplate - Long running operation failed with status 'Failed'. Additional Info:'Deployment template validation failed: 'The resource 'Microsoft.Storage/storageAccounts/myStorageAccount' is not defined in the template. Please see https://aka.ms/arm-template for usage details.'.'

I kind of know it has to do with the dependsOn part of the container resource. But how can I resolve this problem?

CodePudding user response：

You should be able to use:

"dependsOn": [
  "[variables('storageName')]"
]

Note that will only work if there is no other resource in the template with the same name - otherwise you have to manually construct the full resourceId, like:

[format('{0}/resourceGroups/{1}/providers/Microsoft.Storage/storageAccounts/{2}', subscription().id, parameters('rgName'), variables('storageName'))]

The latter form will always work, just a bit more verbose.

A bit more detail is that the resourceId function doesn't work as you would expect at subscription scope.