ARM Template Copy with Array - azure

Question

I am trying to deploy a number of Private DNS resources in Azure using the following code:
"variables": {
"blobDNSName": "privatelink.blob.core.windows.net",
"databaseDNSName": "privatelink.database.core.windows.net",
"datafactoryDNSName": "privatelink.datafactory.core.windows.net",
"dfsDNSName": "privatelink.dfs.core.windows.net",
"keyvaultDNSName": "privatelink.vaultcore.core.windows.net",
"blobTags": {
"value": {
"Application": "Monitor",
"CostCentre": "[parameters('costCentre')]",
"Criticality": "[parameters('criticality')]",
"Owner": "[parameters('owner')]",
"Project": "[parameters('project')]",
"Enviroment": "[parameters('environment')]"
}
},
"databaseTags": {
"value": {
"Application": "SQL",
"CostCentre": "[parameters('costCentre')]",
"Criticality": "[parameters('criticality')]",
"Owner": "[parameters('owner')]",
"Project": "[parameters('project')]",
"Enviroment": "[parameters('environment')]"
}
},
"datafactoryTags": {
"value": {
"Application": "Data Factory",
"CostCentre": "[parameters('costCentre')]",
"Criticality": "[parameters('criticality')]",
"Owner": "[parameters('owner')]",
"Project": "[parameters('project')]",
"Enviroment": "[parameters('environment')]"
}
},
"dfsTags": {
"value": {
"Application": "Data Lake",
"CostCentre": "[parameters('costCentre')]",
"Criticality": "[parameters('criticality')]",
"Owner": "[parameters('owner')]",
"Project": "[parameters('project')]",
"Enviroment": "[parameters('environment')]"
}
},
"keyvaultTags": {
"value": {
"Application": "Key Vault",
"CostCentre": "[parameters('costCentre')]",
"Criticality": "[parameters('criticality')]",
"Owner": "[parameters('owner')]",
"Project": "[parameters('project')]",
"Enviroment": "[parameters('environment')]"
}
},
"dnsArray": {
"value": [
{
"dns": "[variables('blobDNSName')]",
"tags": "[variables('blobTags')]"
},
{
"dns": "[variables('databaseDNSName')]",
"tags": "[variables('databaseTags')]"
},
{
"dns": "[variables('datafactoryDNSName')]",
"tags": "[variables('datafactoryTags')]"
},
{
"dns": "[variables('dfsDNSName')]",
"tags": "[variables('dfsTags')]"
},
{
"dns": "[variables('keyvaultDNSName')]",
"tags": "[variables('keyvaultTags')]"
}
]
}
and:
"resources": [
{
"type": "Microsoft.Network/privateDnsZones",
"apiVersion": "[utils.apiVersion('Microsoft.Network', 'privateDnsZones')]",
"name": "[variables('dnsArray')[copyIndex('dnsCopy')].dns]",
//"tags": "[[copyIndex('dnsCopy')].tags]",
"copy": {
"name": "dnsCopy",
"count": "[length(variables('dnsArray'))]"
},
"location": "global",
"properties": {
"maxNumberOfRecordSets": 25000,
"maxNumberOfVirtualNetworkLinks": 1000,
"maxNumberOfVirtualNetworkLinksWithRegistration": 100,
"numberOfRecordSets": 1,
"numberOfVirtualNetworkLinks": 0,
"numberOfVirtualNetworkLinksWithRegistration": 0,
"provisioningState": "Succeeded"
}
}]
The error I get is:
Deployment template validation failed: 'The template resource '[variables('dnsArray')[copyIndex('dnsCopy')].value.dns]' at line '150' and column '9' is not valid: The language expression property '0' can't be evaluated, property name must be a string.. Please see https://aka.ms/arm-template-expressions for usage details.'. (Code: InvalidTemplate)
Which is occurring on this line:
"name": "[variables('dnsArray')[copyIndex('dnsCopy')].dns]",
Is what I am trying to attempt possible?

Answer 1

I've managed to solve the issue after much head scratching and in case anyone encounters such an issue:
{
"type": "Microsoft.Network/privateDnsZones",
"apiVersion": "[utils.apiVersion('Microsoft.Network', 'privateDnsZones')]",
"name": "[variables('dnsArray').value[copyIndex('dnsCopy')].dns]",
"tags": "[variables('dnsArray').value[copyIndex('dnsCopy')].tags.value]",
"copy": {
"name": "dnsCopy",
"count": "[length(variables('dnsArray').value)]"
},
"location": "global",
"properties": {
"maxNumberOfRecordSets": 25000, "maxNumberOfVirtualNetworkLinks": 1000,
"maxNumberOfVirtualNetworkLinksWithRegistration": 100,
"numberOfRecordSets": 1,
"numberOfVirtualNetworkLinks": 0,
"numberOfVirtualNetworkLinksWithRegistration": 0,
"provisioningState": "Succeeded"
}
}
Note the use of value after dnsArray