create azure vm scale set into existing vnet.json

{
  "$schema": "http://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json",
  "contentVersion": "1.0.0.0",
  "parameters": {
    "vmSku": {
      "type": "string",
      "defaultValue": "Standard_F1",
      "metadata": {
        "description": "Size of VMs in the VM Scale Set."
      }
    },
    "vmssName": {
      "type": "string",
      "metadata": {
        "description": "Globally unique dns name for the scale set. Must be 3-61 characters in length and globally unique across Azure."
      },
      "maxLength": 61
    },
    "instanceCount": {
      "type": "int",
      "metadata": {
        "description": "Number of VM instances (100 or less)."
      },
      "defaultValue": 2,
      "maxValue": 100
    },
    "adminUsername": {
      "type": "string",
      "metadata": {
        "description": "Admin username on all VMs."
      }
    },
    "adminPassword": {
      "type": "securestring",
      "metadata": {
        "description": "Admin password on all VMs."
      }
    },
    "existingVnetResourceGroupName": {
      "type": "string",
      "metadata": {
        "description": "Name of the resourceGroup for the existing virtual network to deploy the scale set into."
      }
    },
    "existingVnetName": {
      "type": "string",
      "metadata": {
        "description": "vName of the existing virtual network to deploy the scale set into."
      }
    },
    "existingSubnetName": {
      "type": "string",
      "metadata": {
        "description": "Name of the existing subnet to deploy the scale set into."
      }
    }
  },
  "variables": {
    "publicIPAddressName": "pip",
    "loadBalancerName": "loadBalancer",
    "loadBalancerFrontEndName": "loadBalancerFrontEnd",
    "loadBalancerBackEndName": "loadBalancerBackEnd",
    "loadBalancerProbeName": "loadBalancerHttpProbe",
    "loadBalancerNatPoolName": "loadBalancerNatPool"
  },
  "resources": [
    {
      "type": "Microsoft.Compute/virtualMachineScaleSets",
      "name": "[parameters('vmssName')]",
      "location": "[resourceGroup().location]",
      "apiVersion": "2017-03-30",
      "dependsOn": [
        "[resourceId('Microsoft.Network/loadBalancers', variables('loadBalancerName'))]"
      ],
      "sku": {
        "name": "[parameters('vmSku')]",
        "capacity": "[parameters('instanceCount')]"
      },
      "properties": {
        "overprovision": "true",
        "upgradePolicy": {
          "mode": "Manual"
        },
        "virtualMachineProfile": {
          "storageProfile": {
            "imageReference": {
              "publisher": "MicrosoftWindowsServer",
              "offer": "WindowsServer",
              "sku": "2016-Datacenter",
              "version": "latest"
            }
          },
          "osProfile": {
            "computerNamePrefix": "[parameters('vmssName')]",
            "adminUsername": "[parameters('adminUsername')]",
            "adminPassword": "[parameters('adminPassword')]"
          },
          "networkProfile": {
            "networkInterfaceConfigurations": [
              {
                "name": "nic",
                "properties": {
                  "primary": true,
                  "ipConfigurations": [
                    {
                      "name": "ipconfig",
                      "properties": {
                        "subnet": {
                          "id": "[resourceId(parameters('existingVnetResourceGroupName'), 'Microsoft.Network/virtualNetworks/subnets', parameters('existingVnetName'), parameters('existingSubNetName'))]"
                        },
                        "loadBalancerBackendAddressPools": [
                          {
                            "id": "[concat('/subscriptions/', subscription().subscriptionId,'/resourceGroups/', resourceGroup().name, '/providers/Microsoft.Network/loadBalancers/', variables('loadBalancerName'), '/backendAddressPools/', variables('loadBalancerBackEndName'))]"
                          }
                        ],
                        "loadBalancerInboundNatPools": [
                          {
                            "id": "[concat('/subscriptions/', subscription().subscriptionId,'/resourceGroups/', resourceGroup().name, '/providers/Microsoft.Network/loadBalancers/', variables('loadBalancerName'), '/inboundNatPools/', variables('loadBalancerNatPoolName'))]"
                          }
                        ]
                      }
                    }
                  ]
                }
              }
            ]
          }
        }
      }
    },
    {
      "type": "Microsoft.Network/publicIPAddresses",
      "name": "[variables('publicIPAddressName')]",
      "location": "[resourceGroup().location]",
      "apiVersion": "2017-04-01",
      "properties": {
        "publicIPAllocationMethod": "Dynamic",
        "dnsSettings": {
          "domainNameLabel": "[toLower(parameters('vmssName'))]"
        }
      }
    },
    {
      "type": "Microsoft.Network/loadBalancers",
      "name": "[variables('loadBalancerName')]",
      "location": "[resourceGroup().location]",
      "apiVersion": "2017-04-01",
      "dependsOn": [
        "[variables('publicIPAddressName')]"
      ],
      "properties": {
        "frontendIPConfigurations": [
          {
            "name": "[variables('loadBalancerFrontEndName')]",
            "properties": {
              "publicIPAddress": {
                "id": "[resourceId('Microsoft.Network/publicIPAddresses', variables('publicIPAddressName'))]"
              }
            }
          }
        ],
        "backendAddressPools": [
          {
            "name": "[variables('loadBalancerBackendName')]"
          }
        ],
        "probes": [
          {
            "name": "[variables('loadBalancerProbeName')]",
            "properties": {
              "protocol": "Tcp",
              "port": 80,
              "intervalInSeconds": 5,
              "numberOfProbes": 2
            }
          }
        ],
        "inboundNatPools": [
          {
            "name": "[variables('loadBalancerNatPoolName')]",
            "properties": {
              "frontendIPConfiguration": {
                "id": "[concat(resourceId('Microsoft.Network/loadBalancers', variables('loadBalancerName')), '/frontendIPConfigurations/', variables('loadBalancerFrontEndName'))]"
              },
              "protocol": "tcp",
              "frontendPortRangeStart": 50000,
              "frontendPortRangeEnd": 50019,
              "backendPort": 22
            }
          }
        ]
      }
    }
  ]
}