diff --git a/201-vmss-scale-existing/azuredeploy.json b/201-vmss-scale-existing/azuredeploy.json
index 91ee58375889..27c524fab936 100644
--- a/201-vmss-scale-existing/azuredeploy.json
+++ b/201-vmss-scale-existing/azuredeploy.json
@@ -1,37 +1,74 @@
 {
   "$schema":"https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
   "contentVersion":"1.0.0.0",
-  "parameters":{
-    "existingVMSSName":{
-      "type":"string",
-      "metadata":{
-        "description":"Name of existing VM Scale Set"
-      }
-    },
-    "newCapacity":{
-      "type":"int",
-      "metadata":{
-        "description":"Number of desired VM instances"
-      }
-    },
-    "vmSku": {
+  "parameters": {
+    "namingInfix": {
       "type": "string",
-      "defaultValue": "Standard_D1_v2",
       "metadata": {
-        "description": "Size of VMs in the VM Scale Set."
+        "description": "Naming infix of existing VM Scale Set."
       }
     }
   },
   "resources":[
     {
-      "type":"Microsoft.Compute/virtualMachineScaleSets",
-      "apiVersion":"2017-03-30",
-      "name":"[parameters('existingVMSSName')]",
-      "location":"[resourceGroup().location]",
-      "sku":{
-        "name":"[parameters('vmSku')]",
-        "tier":"Standard",
-        "capacity":"[parameters('newCapacity')]"
+      "type": "Microsoft.Insights/autoscaleSettings",
+      "apiVersion": "2015-04-01",
+      "name": "autoscalewad",
+      "location": "[resourceGroup().location]",
+      "properties": {
+        "name": "autoscalewad",
+        "targetResourceUri": "[resourceId('Microsoft.Compute/virtualMachineScaleSets/', parameters('namingInfix'))]",
+        "enabled": true,
+        "profiles": [
+          {
+            "name": "Profile1",
+            "capacity": {
+              "minimum": "1",
+              "maximum": "10",
+              "default": "1"
+            },
+            "rules": [
+              {
+                "metricTrigger": {
+                  "metricName": "Percentage CPU",
+                  "metricNamespace": "",
+                  "metricResourceUri": "[resourceId('Microsoft.Compute/virtualMachineScaleSets/', parameters('namingInfix'))]",
+                  "timeGrain": "PT1M",
+                  "statistic": "Average",
+                  "timeWindow": "PT5M",
+                  "timeAggregation": "Average",
+                  "operator": "GreaterThan",
+                  "threshold": 60
+                },
+                "scaleAction": {
+                  "direction": "Increase",
+                  "type": "ChangeCount",
+                  "value": "3",
+                  "cooldown": "PT1M"
+                }
+              },
+              {
+                "metricTrigger": {
+                  "metricName": "Percentage CPU",
+                  "metricNamespace": "",
+                  "metricResourceUri": "[resourceId('Microsoft.Compute/virtualMachineScaleSets/', parameters('namingInfix'))]",
+                  "timeGrain": "PT1M",
+                  "statistic": "Average",
+                  "timeWindow": "PT5M",
+                  "timeAggregation": "Average",
+                  "operator": "LessThan",
+                  "threshold": 30
+                },
+                "scaleAction": {
+                  "direction": "Decrease",
+                  "type": "ChangeCount",
+                  "value": "1",
+                  "cooldown": "PT5M"
+                }
+              }
+            ]
+          }
+        ]
       }
     }
   ]
diff --git a/201-vmss-scale-existing/azuredeploy.parameters.json b/201-vmss-scale-existing/azuredeploy.parameters.json
index 7a2d68fb4135..df8521222958 100644
--- a/201-vmss-scale-existing/azuredeploy.parameters.json
+++ b/201-vmss-scale-existing/azuredeploy.parameters.json
@@ -2,11 +2,8 @@
     "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
     "contentVersion": "1.0.0.0",
     "parameters": {
-        "existingVMSSName": {
-            "value": "GET-PREREQ-existingVmssName"
-        },
-        "newCapacity": {
-            "value": 3
+        "namingInfix": {
+            "value": "GET-PREREQ-namingInfix"
         }
     }
 }
diff --git a/201-vmss-scale-existing/prereqs/.settings.json b/201-vmss-scale-existing/prereqs/.settings.json
new file mode 100644
index 000000000000..154e82537a39
--- /dev/null
+++ b/201-vmss-scale-existing/prereqs/.settings.json
@@ -0,0 +1,4 @@
+{
+    "comment": "If prereqs need to be deployed to the same resourceGroup as the rest of the sample set the PrereqResourceGroupNameSuffix property to an empty string - otherwise you can omit this file",
+    "PrereqResourceGroupNameSuffix": ""
+}
\ No newline at end of file
diff --git a/201-vmss-scale-existing/prereqs/prereq.azuredeploy.json b/201-vmss-scale-existing/prereqs/prereq.azuredeploy.json
index 6e641ac889cd..544978f15db9 100644
--- a/201-vmss-scale-existing/prereqs/prereq.azuredeploy.json
+++ b/201-vmss-scale-existing/prereqs/prereq.azuredeploy.json
@@ -1,221 +1,251 @@
 {
-    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
-    "contentVersion": "1.0.0.0",
-    "parameters": {
-        "adminUsername": {
-            "type": "string",
-            "metadata": {
-                "description": "Name of existing VM Scale Set"
-            }
-        },
-        "adminPassword": {
-            "type": "securestring",
-            "metadata": {
-                "description": "Number of desired VM instances"
-            }
-        }
+  "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
+  "contentVersion": "1.0.0.0",
+  "parameters": {
+    "vmSku": {
+      "type": "string",
+      "defaultValue": "Standard_A1",
+      "metadata": {
+        "description": "Size of VMs in the VM Scale Set."
+      }
+    },
+    "ubuntuOSVersion": {
+      "type": "string",
+      "defaultValue": "16.04-LTS",
+      "allowedValues": [
+        "14.04.4-LTS",
+        "16.04-LTS"
+      ],
+      "metadata": {
+        "description": "The Ubuntu version for the VM. This will pick a fully patched image of this given Ubuntu version. Allowed values are: 15.10, 14.04.4-LTS."
+      }
+    },
+    "vmssName": {
+      "type": "string",
+      "metadata": {
+        "description": "String used as a base for naming resources. Must be 3-61 characters in length and globally unique across Azure. A hash is prepended to this string for some resources, and resource-specific information is appended."
+      },
+      "maxLength": 61
+    },
+    "instanceCount": {
+      "type": "int",
+      "metadata": {
+        "description": "Number of VM instances (100 or less)."
+      },
+      "maxValue": 100
+    },
+    "adminUsername": {
+      "type": "string",
+      "metadata": {
+        "description": "Admin username on all VMs."
+      }
     },
-    "variables": {
-        "namingInfix": "existingvmss",
-        "virtualNetworkName": "[concat(variables('namingInfix'), 'vnet')]",
-        "publicIPAddressName": "[concat(variables('namingInfix'), 'pip')]",
-        "subnetName": "[concat(variables('namingInfix'), 'subnet')]",
-        "loadBalancerName": "[concat(variables('namingInfix'), 'lb')]",
-        "natPoolName": "[concat(variables('namingInfix'), 'natpool')]",
-        "bePoolName": "[concat(variables('namingInfix'), 'bepool')]"
+    "authenticationType": {
+      "type": "string",
+      "defaultValue": "sshPublicKey",
+      "allowedValues": [
+        "sshPublicKey",
+        "password"
+      ],
+      "metadata": {
+        "description": "Type of authentication to use on the Virtual Machine. SSH key is recommended."
+      }
     },
-    "resources": [{
-            "type": "Microsoft.Network/virtualNetworks",
-            "name": "[variables('virtualNetworkName')]",
-            "location": "[resourceGroup().location]",
-            "apiVersion": "2016-03-30",
+    "adminPasswordOrKey": {
+      "type": "securestring",
+      "metadata": {
+        "description": "SSH Key or password for the Virtual Machine. SSH key is recommended."
+      }
+    }
+  },
+  "variables": {
+    "vmssName": "[parameters('vmssName')]",
+    "namingInfix": "[toLower(substring(concat(parameters('vmssName'), uniqueString(resourceGroup().id)), 0, 9))]",
+    "longNamingInfix": "[toLower(parameters('vmssName'))]",
+    "addressPrefix": "10.0.0.0/16",
+    "subnetPrefix": "10.0.0.0/24",
+    "virtualNetworkName": "[concat(variables('namingInfix'), 'vnet')]",
+    "publicIPAddressName": "[concat(variables('namingInfix'), 'pip')]",
+    "subnetName": "[concat(variables('namingInfix'), 'subnet')]",
+    "loadBalancerName": "[concat(variables('namingInfix'), 'lb')]",
+    "publicIPAddressID": "[resourceId('Microsoft.Network/publicIPAddresses',variables('publicIPAddressName'))]",
+    "lbID": "[resourceId('Microsoft.Network/loadBalancers',variables('loadBalancerName'))]",
+    "natPoolName": "[concat(variables('namingInfix'), 'natpool')]",
+    "bePoolName": "[concat(variables('namingInfix'), 'bepool')]",
+    "natStartPort": 50000,
+    "natEndPort": 50119,
+    "natBackendPort": 22,
+    "nicName": "[concat(variables('namingInfix'), 'nic')]",
+    "ipConfigName": "[concat(variables('namingInfix'), 'ipconfig')]",
+    "frontEndIPConfigID": "[concat(variables('lbID'),'/frontendIPConfigurations/loadBalancerFrontEnd')]",
+    "osType": {
+      "publisher": "Canonical",
+      "offer": "UbuntuServer",
+      "sku": "[parameters('ubuntuOSVersion')]",
+      "version": "latest"
+    },
+    "imageReference": "[variables('osType')]",
+    "linuxConfiguration": {
+      "disablePasswordAuthentication": true,
+      "ssh": {
+        "publicKeys": [
+          {
+            "path": "[concat('/home/', parameters('adminUsername'), '/.ssh/authorized_keys')]",
+            "keyData": "[parameters('adminPasswordOrKey')]"
+          }
+        ]
+      }
+    }
+  },
+  "resources": [
+    {
+      "type": "Microsoft.Network/virtualNetworks",
+      "name": "[variables('virtualNetworkName')]",
+      "location": "[resourceGroup().location]",
+      "apiVersion": "2017-04-01",
+      "properties": {
+        "addressSpace": {
+          "addressPrefixes": [
+            "[variables('addressPrefix')]"
+          ]
+        },
+        "subnets": [
+          {
+            "name": "[variables('subnetName')]",
             "properties": {
-                "addressSpace": {
-                    "addressPrefixes": [
-                        "10.0.0.0/16"
-                    ]
-                },
-                "subnets": [{
-                    "name": "[variables('subnetName')]",
-                    "properties": {
-                        "addressPrefix": "10.0.0.0/24"
-                    }
-                }]
+              "addressPrefix": "[variables('subnetPrefix')]"
             }
-        },
-        {
-            "type": "Microsoft.Network/publicIPAddresses",
-            "name": "[variables('publicIPAddressName')]",
-            "location": "[resourceGroup().location]",
-            "apiVersion": "2016-03-30",
+          }
+        ]
+      }
+    },
+    {
+      "type": "Microsoft.Network/publicIPAddresses",
+      "name": "[variables('publicIPAddressName')]",
+      "location": "[resourceGroup().location]",
+      "apiVersion": "2017-04-01",
+      "properties": {
+        "publicIPAllocationMethod": "Dynamic",
+        "dnsSettings": {
+          "domainNameLabel": "[variables('longNamingInfix')]"
+        }
+      }
+    },
+    {
+      "type": "Microsoft.Network/loadBalancers",
+      "name": "[variables('loadBalancerName')]",
+      "location": "[resourceGroup().location]",
+      "apiVersion": "2017-04-01",
+      "dependsOn": [
+        "[resourceId('Microsoft.Network/publicIPAddresses', variables('publicIPAddressName'))]"
+      ],
+      "properties": {
+        "frontendIPConfigurations": [
+          {
+            "name": "LoadBalancerFrontEnd",
             "properties": {
-                "publicIPAllocationMethod": "Dynamic",
-                "dnsSettings": {
-                    "domainNameLabel": "[toLower(substring(concat('existingvmss', uniqueString(resourceGroup().id)), 0, 16))]"
-                }
+              "publicIPAddress": {
+                "id": "[variables('publicIPAddressID')]"
+              }
             }
-        },
-        {
-            "type": "Microsoft.Network/loadBalancers",
-            "name": "[variables('loadBalancerName')]",
-            "location": "[resourceGroup().location]",
-            "apiVersion": "2016-03-30",
-            "dependsOn": [
-                "[concat('Microsoft.Network/publicIPAddresses/', variables('publicIPAddressName'))]"
-            ],
+          }
+        ],
+        "backendAddressPools": [
+          {
+            "name": "[variables('bePoolName')]"
+          }
+        ],
+        "inboundNatPools": [
+          {
+            "name": "[variables('natPoolName')]",
             "properties": {
-                "frontendIPConfigurations": [{
-                    "name": "LoadBalancerFrontEnd",
-                    "properties": {
-                        "publicIPAddress": {
-                            "id": "[resourceId('Microsoft.Network/publicIPAddresses',variables('publicIPAddressName'))]"
-                        }
-                    }
-                }],
-                "backendAddressPools": [{
-                    "name": "[variables('bePoolName')]"
-                }],
-                "inboundNatPools": [{
-                    "name": "[variables('natPoolName')]",
-                    "properties": {
-                        "frontendIPConfiguration": {
-                            "id": "[concat(resourceId('Microsoft.Network/loadBalancers',variables('loadBalancerName')),'/frontendIPConfigurations/loadBalancerFrontEnd')]"
-                        },
-                        "protocol": "Tcp",
-                        "frontendPortRangeStart": 50000,
-                        "frontendPortRangeEnd": 50119,
-                        "backendPort": 3389
-                    }
-                }]
+              "frontendIPConfiguration": {
+                "id": "[variables('frontEndIPConfigID')]"
+              },
+              "protocol": "Tcp",
+              "frontendPortRangeStart": "[variables('natStartPort')]",
+              "frontendPortRangeEnd": "[variables('natEndPort')]",
+              "backendPort": "[variables('natBackendPort')]"
             }
+          }
+        ]
+      }
+    },
+    {
+      "type": "Microsoft.Compute/virtualMachineScaleSets",
+      "name": "[variables('namingInfix')]",
+      "location": "[resourceGroup().location]",
+      "apiVersion": "2017-03-30",
+      "dependsOn": [
+        "[resourceId('Microsoft.Network/loadBalancers/', variables('loadBalancerName'))]",
+        "[resourceId('Microsoft.Network/virtualNetworks/', variables('virtualNetworkName'))]"
+      ],
+      "sku": {
+        "name": "[parameters('vmSku')]",
+        "tier": "Standard",
+        "capacity": "[parameters('instanceCount')]"
+      },
+      "properties": {
+        "overprovision": true,
+        "upgradePolicy": {
+          "mode": "Manual"
         },
-        {
-            "type": "Microsoft.Compute/virtualMachineScaleSets",
-            "name": "existingvmss",
-            "location": "[resourceGroup().location]",
-            "apiVersion": "2017-03-30",
-            "dependsOn": [
-                "[concat('Microsoft.Network/loadBalancers/', variables('loadBalancerName'))]",
-                "[concat('Microsoft.Network/virtualNetworks/', variables('virtualNetworkName'))]"
-            ],
-            "sku": {
-                "name": "Standard_D1_v2",
-                "tier": "Standard",
-                "capacity": 2
+        "virtualMachineProfile": {
+          "storageProfile": {
+            "osDisk": {
+              "createOption": "FromImage",
+              "caching": "ReadWrite"
             },
-            "properties": {
-                "overprovision": true,
-                "upgradePolicy": {
-                    "mode": "Manual"
-                },
-                "virtualMachineProfile": {
-                    "storageProfile": {
-                        "osDisk": {
-                            "createOption": "FromImage"
+            "imageReference": "[variables('imageReference')]"
+          },
+          "osProfile": {
+            "computerNamePrefix": "[variables('namingInfix')]",
+            "adminUsername": "[parameters('adminUsername')]",
+            "adminPassword": "[parameters('adminPasswordOrKey')]",
+            "linuxConfiguration": "[if(equals(parameters('authenticationType'), 'password'), json('null'), variables('linuxConfiguration'))]"
+          },
+          "networkProfile": {
+            "networkInterfaceConfigurations": [
+              {
+                "name": "[variables('nicName')]",
+                "properties": {
+                  "primary": true,
+                  "ipConfigurations": [
+                    {
+                      "name": "[variables('ipConfigName')]",
+                      "properties": {
+                        "subnet": {
+                          "id": "[resourceId('Microsoft.Network/virtualNetworks/subnets', variables('virtualNetworkName'), variables('subnetName'))]"
                         },
-                        "imageReference": {
-                            "publisher": "MicrosoftWindowsServer",
-                            "offer": "WindowsServer",
-                            "sku": "2012-R2-Datacenter",
-                            "version": "latest"
-                        }
-                    },
-                    "osProfile": {
-                        "computerNamePrefix": "existvmss",
-                        "adminUsername": "[parameters('adminUsername')]",
-                        "adminPassword": "[parameters('adminPassword')]"
-                    },
-                    "networkProfile": {
-                        "networkInterfaceConfigurations": [{
-                            "name": "[concat(variables('namingInfix'), 'nic')]",
-                            "properties": {
-                                "primary": true,
-                                "ipConfigurations": [{
-                                    "name": "[concat(variables('namingInfix'), 'ipconfig')]",
-                                    "properties": {
-                                        "subnet": {
-                                            "id": "[resourceId('Microsoft.Network/virtualNetworks/subnets', variables('virtualNetworkName'), variables('subnetName'))]"
-                                        },
-                                        "loadBalancerBackendAddressPools": [{
-                                            "id": "[resourceId('Microsoft.Network/loadBalancers/backendAddressPools', variables('loadBalancerName'), variables('bePoolName'))]"
-                                        }],
-                                        "loadBalancerInboundNatPools": [{
-                                            "id": "[resourceId('Microsoft.Network/loadBalancers/inboundNatPools', variables('loadBalancerName'), variables('natPoolName'))]"
-                                        }]
-                                    }
-                                }]
-                            }
-                        }]
+                        "loadBalancerBackendAddressPools": [
+                          {
+                            "id": "[resourceId('Microsoft.Network/loadBalancers/backendAddressPools', variables('loadBalancerName'), variables('bePoolName'))]"
+                          }
+                        ],
+                        "loadBalancerInboundNatPools": [
+                          {
+                            "id": "[resourceId('Microsoft.Network/loadBalancers/inboundNatPools', variables('loadBalancerName'), variables('natPoolName'))]"
+                          }
+                        ]
+                      }
                     }
+                  ]
                 }
-            }
-        },
-        {
-            "type": "Microsoft.Insights/autoscaleSettings",
-            "apiVersion": "2015-04-01",
-            "name": "cpuautoscale",
-            "location": "[resourceGroup().location]",
-            "dependsOn": [
-                "[concat('Microsoft.Compute/virtualMachineScaleSets/', 'existingvmss')]"
-            ],
-            "properties": {
-                "name": "cpuautoscale",
-                "targetResourceUri": "[concat('/subscriptions/',subscription().subscriptionId, '/resourceGroups/',  resourceGroup().name, '/providers/Microsoft.Compute/virtualMachineScaleSets/', 'existingvmss')]",
-                "enabled": true,
-                "profiles": [{
-                    "name": "Profile1",
-                    "capacity": {
-                        "minimum": "1",
-                        "maximum": "10",
-                        "default": "1"
-                    },
-                    "rules": [{
-                            "metricTrigger": {
-                                "metricName": "Percentage CPU",
-                                "metricNamespace": "",
-                                "metricResourceUri": "[concat('/subscriptions/',subscription().subscriptionId, '/resourceGroups/',  resourceGroup().name, '/providers/Microsoft.Compute/virtualMachineScaleSets/', 'existingvmss')]",
-                                "timeGrain": "PT1M",
-                                "statistic": "Average",
-                                "timeWindow": "PT5M",
-                                "timeAggregation": "Average",
-                                "operator": "GreaterThan",
-                                "threshold": 50
-                            },
-                            "scaleAction": {
-                                "direction": "Increase",
-                                "type": "ChangeCount",
-                                "value": "1",
-                                "cooldown": "PT5M"
-                            }
-                        },
-                        {
-                            "metricTrigger": {
-                                "metricName": "Percentage CPU",
-                                "metricNamespace": "",
-                                "metricResourceUri": "[concat('/subscriptions/',subscription().subscriptionId, '/resourceGroups/',  resourceGroup().name, '/providers/Microsoft.Compute/virtualMachineScaleSets/', 'existingvmss')]",
-                                "timeGrain": "PT1M",
-                                "statistic": "Average",
-                                "timeWindow": "PT5M",
-                                "timeAggregation": "Average",
-                                "operator": "LessThan",
-                                "threshold": 30
-                            },
-                            "scaleAction": {
-                                "direction": "Decrease",
-                                "type": "ChangeCount",
-                                "value": "1",
-                                "cooldown": "PT5M"
-                            }
-                        }
-                    ]
-                }]
-            }
+              }
+            ]
+          }
         }
-    ],
-    "outputs": {
+      }
+    }
+  ],
+  "outputs": {
         "existingVmssName": {
             "type": "string",
-            "value": "existingvmss"
+            "value": "[variables('vmssName')]"
+        },
+        "namingInfix": {
+            "type": "string",
+            "value": "[variables('namingInfix')]"
         }
     }
-}
+}
\ No newline at end of file
diff --git a/201-vmss-scale-existing/prereqs/prereq.azuredeploy.parameters.json b/201-vmss-scale-existing/prereqs/prereq.azuredeploy.parameters.json
index cdb415777c63..89713ba4579e 100644
--- a/201-vmss-scale-existing/prereqs/prereq.azuredeploy.parameters.json
+++ b/201-vmss-scale-existing/prereqs/prereq.azuredeploy.parameters.json
@@ -2,12 +2,23 @@
     "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentParameters.json#",
     "contentVersion": "1.0.0.0",
     "parameters": {
-
-        "adminUsername": {
-            "value": "GEN-UNIQUE"
-        },
-        "adminPassword": {
-            "value": "GEN-PASSWORD"
-        }
+      "vmSku": {
+        "value": "Standard_DS2_V2"
+      },
+      "ubuntuOSVersion": {
+        "value": "16.04-LTS"
+      },
+      "vmssName": {
+        "value": "GEN-UNIQUE-32"
+      },
+      "instanceCount": {
+        "value": 2
+      },
+      "adminUsername": {
+        "value": "GEN-UNIQUE"
+      },
+      "adminPasswordOrKey": {
+        "value": "GEN-SSH-PUB-KEY"
+      }
     }
-}
\ No newline at end of file
+  }
\ No newline at end of file