privateDNShubLinkPolicyDeployINE.json

{
  "properties": {
    "displayName": "Private DNS - deployINE virtual network link",
    "policyType": "Custom",
    "mode": "All",
    "description": "Automatically create a link to a selected virtual network when a private DNS zone is created. This is useful when DNS zones need to be linked to a hub virtual network where DNS forwarders have been deployed.",
    "parameters": {
      "virtualNetworkLinkName": {
        "type": "String",
        "metadata": {
          "displayName": "Virtual Network Link Name",
          "description": "The name of the virtual network link to create"
        }
      },
      "targetVnet": {
        "type": "String",
        "metadata": {
          "displayName": "Target virtual network",
          "description": "The target virtual network for Private DNS zone connections"
        }
      }
    },
    "policyRule": {
      "if": {
        "field": "type",
        "equals": "Microsoft.Network/privateDnsZones"
      },
      "then": {
        "effect": "deployIfNotExists",
        "details": {
          "type": "Microsoft.Network/privateDnsZones/virtualNetworkLinks",
          "name": "[parameters('virtualNetworkLinkName')]",
          "roleDefinitionIds": [
            "/providers/Microsoft.Authorization/roleDefinitions/4d97b98b-1d4f-4787-a291-c67834d212e7"
          ],
          "existenceCondition": {
            "field": "Microsoft.Network/privateDnsZones/virtualNetworkLinks/virtualNetwork.id",
            "equals": "[parameters('targetVnet')]"
          },
          "deployment": {
            "properties": {
              "mode": "incremental",
              "template": {
                "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
                "contentVersion": "1.0.0.0",
                "parameters": {
                  "privateDNSZoneName": {
                    "type": "string"
                  },
                  "virtualNetworkLinkName": {
                    "type": "string"
                  },
                  "targetVnetId": {
                    "type": "string"
                  }
                },
                "resources": [
                  {
                    "name": "[concat(parameters('privateDNSZoneName'), '/', parameters('virtualNetworkLinkName'))]",
                    "type": "Microsoft.Network/privateDnsZones/virtualNetworkLinks",
                    "apiVersion": "2018-09-01",
                    "tags": {},
                    "location": "global",
                    "properties": {
                      "virtualNetwork": {
                        "id": "[parameters('targetVnetId')]"
                      },
                      "registrationEnabled": false
                    }
                  }
                ]
              },
              "parameters": {
                "privateDNSZoneName": {
                  "value": "[field('name')]"
                },
                "virtualNetworkLinkName": {
                  "value": "[parameters('virtualNetworkLinkName')]"
                },
                "targetVnetId": {
                  "value": "[parameters('targetVnet')]"
                }
              }
            }
          }
        }
      }
    }
  }
}