ARM template throws incorrect segments lengths for array of storage containers types

Question

I am getting Template validation failed: The template resource 'reports' for type 'Microsoft.WindowsAzure.ResourceStack.Frontdoor.Common.Entities.TemplateGenericProperty`1[System.String]' at line '34' and column '79' has incorrect segment lengths. A nested resource type must have identical number of segments as its resource name. A root resource type must have segment length one greater than its resource name. Please see https://aka.ms/arm-template/#resources for usage details. when I make ARM to create containers from the array in parameters file.

Issue line: "type": "Microsoft.Storage/storageAccounts/blobServices/containers",

Here is my ARM template file.

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "storageAccountName": {
            "type": "string",
            "metadata": {
                "description": "The name of the storage account"
            }
        },
        "storageContaners": {
            "type": "string",
            "metadata": {
                "description": "The name of the blob containers"
            }
        }
    },
    "functions": [],
    "variables": {
    },
    "resources": [
        {
            "name": "[parameters('storageAccountName')]",
            "type": "Microsoft.Storage/storageAccounts",
            "apiVersion": "2021-04-01",
            "location": "[resourceGroup().location]",
            "kind": "StorageV2",
            "sku": {
                "name": "Standard_LRS",
                "tier": "Standard"
            }
        },
        {
            "type": "Microsoft.Storage/storageAccounts/blobServices/containers",
            "apiVersion": "2021-04-01",
            "name": "[parameters('storageContaners')]",
            "dependsOn": [
                "[resourceId('Microsoft.Storage/storageAccounts', parameters('storageAccountName'))]"
            ],
            "properties": {
                "publicAccess": "Blob"
            }
        }
    ],
    "outputs": {}
}

Here is my ARM parameters file.

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
        "storageAccountName": {
            "value": "mystorageaccount"
        },
        "storageContaners": {
            "value":  "reports"
        }
    }
}

I have tried changing name to different types but no luck.
Can anybody please help me to figure it out the cause?

shivappa · Answer 1 · 2021-07-17T18:31:58.913

The name parameters under the nested resources must be one level less than the type.
Here type has 4 level(separated by 3 / ).
So name must have 3 level (separated by 2 /).
"type": "Microsoft.Storage/storageAccounts/blobServices/containers",
"name": "[concat(parameters('storageAccountName'), '/default/', parameters('storageContaners')]",
This applies when having nested resources under parent resource.

ARM template throws incorrect segments lengths for array of storage containers types

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