使用 ARM 範本在擴展集中建立虛擬機器

本文將逐步解說如何使用 ARM 範本來建立虛擬機器擴展集。

Azure Resource Manager 範本是一個 JavaScript 物件標記法 (JSON) 檔案，會定義專案的基礎結構和設定。 範本使用宣告式語法。 您可以描述預期的部署，而不需要撰寫程式設計命令順序來建立部署。

如果您的環境符合必要條件，而且您很熟悉 ARM 範本，請選取 [部署至 Azure] 按鈕。 範本會在 Azure 入口網站中開啟。

必要條件

如果您沒有 Azure 訂用帳戶，請在開始前建立免費帳戶。

ARM 範本

Azure Resource Manager 範本是一個 JavaScript 物件標記法 (JSON) 檔案，會定義專案的基礎結構和設定。 範本使用宣告式語法。 您可以描述預期的部署，而不需要撰寫程式設計命令順序來建立部署。

ARM 範本可讓您部署相關資源的群組。 在單一範本中，您可以建立虛擬機器擴展集、安裝應用程式，並設定自動縮放規則。 使用變數和參數，就可以重複使用此範本來更新現有的、或建立其他的擴展集。 您可以透過 Azure 入口網站、Azure CLI 或 Azure PowerShell，或從持續整合 / 持續傳遞 (CI/CD) 管線部署範本。

檢閱範本

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {
      "location": {
        "type": "string",
        "defaultValue": "[resourceGroup().location]",
        "metadata": {
          "description": "Location for all resources"
        }
      },
      "vmSku": {
        "type": "string",
        "defaultValue": "Standard_D2s_v3",
        "metadata": {
          "description": "Size of VMs in the VM Scale Set."
        }
      },
      "vmssName": {
        "type": "string",
        "metadata": {
          "description": "String used as a base for naming resources (9 characters or less). A hash is prepended to this string for some resources, and resource-specific information is appended."
        }
      },
      "instanceCount": {
        "type": "int",
        "defaultValue": 1,
        "minValue": 1,
        "maxValue": 100,
        "metadata": {
          "description": "Number of VM instances (100 or less)."
        }
      },
      "adminUsername": {
        "type": "string",
        "metadata": {
          "description": "Admin username on all VMs."
        }
      },
      "authenticationType": {
        "type": "string",
        "defaultValue": "sshPublicKey",
        "allowedValues": [
          "sshPublicKey",
          "password"
        ],
        "metadata": {
          "description": "Type of authentication to use on the Virtual Machine. SSH key is recommended."
        }
      },
      "adminPasswordOrKey": {
        "type": "securestring",
        "metadata": {
          "description": "SSH Key or password for the Virtual Machine. SSH key is recommended."
        }
      },
      "securityType": {
          "type": "string",
          "defaultValue": "TrustedLaunch",
          "allowedValues": [
            "Standard",
            "TrustedLaunch"
          ],
          "metadata": {
            "description": "Security Type of the Virtual Machine."
          }
      },
      "_artifactsLocation": {
        "type": "string",
        "defaultValue": "[deployment().properties.templatelink.uri]",
        "metadata": {
          "description": "The base URI where artifacts required by this template are located"
        }
      },
      "_artifactsLocationSasToken": {
        "type": "securestring",
        "defaultValue": "",
        "metadata": {
          "description": "The sasToken required to access _artifactsLocation.  When the template is deployed using the accompanying scripts, a sasToken will be automatically generated"
        }
      }
    },
    "variables": {
      "addressPrefix": "10.0.0.0/16",
      "subnetPrefix": "10.0.0.0/24",
      "networkApiVersion": "2020-11-01",
      "virtualNetworkName": "[concat(parameters('vmssName'), 'vnet')]",
      "publicIPAddressName": "[concat(parameters('vmssName'), 'pip')]",
      "subnetName": "[concat(parameters('vmssName'), 'subnet')]",
      "loadBalancerName": "[concat(parameters('vmssName'), 'lb')]",
      "publicIPAddressID": "[resourceId('Microsoft.Network/publicIPAddresses',variables('publicIPAddressName'))]",
      "networkSecurityGroupName": "[concat(parameters('vmssName'), 'nsg')]",
      "bePoolName": "[concat(parameters('vmssName'), 'bepool')]",
      "lbRuleName": "[concat(parameters('vmssName'), 'lbrule')]",
      "lbProbeName": "[concat(parameters('vmssName'), 'lbprobe')]",
      "bePoolConfigID": "[resourceId('Microsoft.Network/loadBalancers/backendAddressPools', variables('loadBalancerName'),variables('bePoolName'))]",
      "lbProbeID": "[resourceId('Microsoft.Network/loadBalancers/probes', variables('loadBalancerName'),variables('lbProbeName'))]",
      "nicName": "[concat(parameters('vmssName'), 'nic')]",
      "ipConfigName": "[concat(parameters('vmssName'), 'ipconfig')]",
      "frontEndIPConfigID": "[resourceId('Microsoft.Network/loadBalancers/frontendIPConfigurations', variables('loadBalancerName'),'loadBalancerFrontEnd')]",
      "osType": {
          "publisher": "Canonical",
          "offer": "0001-com-ubuntu-server-focal",
          "sku": "20_04-lts-gen2",
          "version": "latest"
      },
      "imageReference": "[variables('osType')]",
      "securityProfileJson": {
          "uefiSettings": {
            "secureBootEnabled": true,
            "vTpmEnabled": true
          },
          "securityType": "[parameters('securityType')]"
      },
      "linuxConfiguration": {
        "disablePasswordAuthentication": true,
        "ssh": {
          "publicKeys": [
            {
              "path": "[concat('/home/', parameters('adminUsername'), '/.ssh/authorized_keys')]",
              "keyData": "[parameters('adminPasswordOrKey')]"
            }
          ]
        }
      }
    },
    "resources": [
              {
            "type": "Microsoft.Network/networkSecurityGroups",
            "apiVersion": "2023-04-01",
            "name": "[variables('networkSecurityGroupName')]",
            "location": "[parameters('location')]",
            "properties": {
                "securityRules": [
                    {
                        "name": "AllowPort9000",
                        "properties": {
                            "protocol": "*",
                            "sourcePortRange": "*",
                            "destinationPortRange": "9000",
                            "sourceAddressPrefix": "Internet",
                            "destinationAddressPrefix": "*",
                            "access": "Allow",
                            "priority": 100,
                            "direction": "Inbound"
                        }
                    }
                ]
            }
        },
      {
        "type": "Microsoft.Network/virtualNetworks",
        "apiVersion": "2023-04-01",
        "name": "[variables('virtualNetworkName')]",
        "location": "[parameters('location')]",
        "properties": {
          "addressSpace": {
            "addressPrefixes": [
              "[variables('addressPrefix')]"
            ]
          },
          "subnets": [
            {
              "name": "[variables('subnetName')]",
              "properties": {
                "addressPrefix": "[variables('subnetPrefix')]",
                "networkSecurityGroup": {
                  "id": "[resourceId('Microsoft.Network/networkSecurityGroups', variables('networkSecurityGroupName'))]"
                }
              }
            }
          ]
        }
      },
      {
        "type": "Microsoft.Network/publicIPAddresses",
        "apiVersion": "2023-04-01",
        "name": "[variables('publicIPAddressName')]",
        "location": "[parameters('location')]",
        "sku": {
          "name": "Standard"
        },
        "properties": {

          "publicIPAllocationMethod": "Static",
          "dnsSettings": {
            "domainNameLabel": "[parameters('vmssName')]"
          }
        }
      },
      {
        "type": "Microsoft.Network/loadBalancers",
        "apiVersion": "2023-04-01",
        "name": "[variables('loadBalancerName')]",
        "location": "[parameters('location')]",
        "sku": {
          "name": "Standard"
        },
        "dependsOn": [
          "[resourceId('Microsoft.Network/publicIPAddresses', variables('publicIPAddressName'))]"
        ],
        "properties": {
          "frontendIPConfigurations": [
            {
              "name": "LoadBalancerFrontEnd",
              "properties": {
                "publicIPAddress": {
                  "id": "[variables('publicIPAddressID')]"
                }
              }
            }
          ],
          "backendAddressPools": [
            {
              "name": "[variables('bePoolName')]"
            }
          ],
          "probes": [
            {
              "name": "[variables('lbProbeName')]",
              "properties": {
                "port": 9000,
                "protocol": "Tcp",
                "numberOfProbes": 2,
                "intervalInSeconds": 5
              }
            }
          ],
          "loadBalancingRules": [
            {
              "name": "[variables('lbRuleName')]",
              "properties": {
                "frontendIPConfiguration": {
                  "id": "[variables('frontEndIPConfigID')]"
                },
                "backendAddressPool": {
                  "id": "[variables('bePoolConfigID')]"
                },
                "probe": {
                  "id": "[variables('lbProbeID')]"
                },
                "loadDistribution": "Default",
                "backendPort": 9000,
                "frontendPort": 9000,
                "protocol": "Tcp",
                "idleTimeoutInMinutes": 4,
                "enableFloatingIP": false,
                "enableTcpReset": false,
                "disableOutboundSnat": false
              }
             }
          ]
        }
      },
      {
        "type": "Microsoft.Compute/virtualMachineScaleSets",
        "apiVersion": "2023-09-01",
        "name": "[parameters('vmssName')]",
        "location": "[parameters('location')]",
        "sku": {
          "name": "[parameters('vmSku')]",
          "tier": "Standard",
          "capacity": "[parameters('instanceCount')]"
        },
        "dependsOn": [
          "[resourceId('Microsoft.Network/loadBalancers', variables('loadBalancerName'))]",
          "[resourceId('Microsoft.Network/virtualNetworks', variables('virtualNetworkName'))]"
        ],
        "properties": {
          "orchestrationMode": "Flexible",
          "platformFaultDomainCount": 1,
          "singlePlacementGroup": false,
          "virtualMachineProfile": {
            "storageProfile": {
              "osDisk": {
                "createOption": "FromImage",
                "caching": "ReadWrite"
              },
              "imageReference": "[variables('imageReference')]"
            },
            "osProfile": {
              "computerNamePrefix": "[parameters('vmssName')]",
              "adminUsername": "[parameters('adminUsername')]",
              "adminPassword": "[parameters('adminPasswordOrKey')]",
              "linuxConfiguration": "[if(equals(parameters('authenticationType'), 'password'), null(), variables('linuxConfiguration'))]"
            },
            "securityProfile": "[if(equals(parameters('securityType'), 'TrustedLaunch'), variables('securityProfileJson'), null())]",
            "networkProfile": {
              "networkApiVersion": "[variables('networkApiVersion')]",
              "networkInterfaceConfigurations": [
                {
                  "name": "[variables('nicName')]",
                  "properties": {
                    "primary": true,
                    "ipConfigurations": [
                      {
                        "name": "[variables('ipConfigName')]",
                        "properties": {
                          "primary": true,
                          "subnet": {
                            "id": "[resourceId('Microsoft.Network/virtualNetworks/subnets', variables('virtualNetworkName'), variables('subnetName'))]"
                          },
                          "loadBalancerBackendAddressPools": [
                            {
                              "id": "[resourceId('Microsoft.Network/loadBalancers/backendAddressPools', variables('loadBalancerName'), variables('bePoolName'))]"
                            }
                          ]
                        }
                      }
                    ]
                  }
                }
              ]
            },
            "extensionProfile": {
              "extensions": [
                {
                  "name": "lapextension",
                  "properties": {
                    "publisher": "Microsoft.Azure.Extensions",
                    "type": "CustomScript",
                    "typeHandlerVersion": "2.0",
                    "autoUpgradeMinorVersion": true,
                    "enableAutomaticUpgrade": true,
                    "settings": {
                      "fileUris": [
                        "[uri(parameters('_artifactsLocation'), concat('installserver.sh', parameters('_artifactsLocationSasToken')))]",
                        "[uri(parameters('_artifactsLocation'), concat('workserver.py', parameters('_artifactsLocationSasToken')))]"
                      ],
                      "commandToExecute": "bash installserver.sh"
                    }
                  }
                }
              ]
            }
          }
        }
      },
      {
        "type": "Microsoft.Insights/autoscaleSettings",
        "apiVersion": "2022-10-01",
        "name": "[concat(parameters('vmssName'), '-autoscalehost')]",
        "location": "[parameters('location')]",
        "dependsOn": [
          "[resourceId('Microsoft.Compute/virtualMachineScaleSets', parameters('vmSSName'))]"
        ],
        "properties": {
          "name": "[concat(parameters('vmssName'), '-autoscalehost')]",
          "targetResourceUri": "[resourceId('Microsoft.Compute/virtualMachineScaleSets', parameters('vmSSName'))]",
          "enabled": true,
          "profiles": [
            {
              "name": "Profile1",
              "capacity": {
                "minimum": "1",
                "maximum": "10",
                "default": "1"
              },
              "rules": [
                {
                  "metricTrigger": {
                    "metricName": "Percentage CPU",
                    "metricResourceUri": "[resourceId('Microsoft.Compute/virtualMachineScaleSets', parameters('vmSSName'))]",
                    "timeGrain": "PT1M",
                    "statistic": "Average",
                    "timeWindow": "PT5M",
                    "timeAggregation": "Average",
                    "operator": "GreaterThan",
                    "threshold": 60
                  },
                  "scaleAction": {
                    "direction": "Increase",
                    "type": "ChangeCount",
                    "value": "1",
                    "cooldown": "PT1M"
                  }
                },
                {
                  "metricTrigger": {
                    "metricName": "Percentage CPU",
                    "metricResourceUri": "[resourceId('Microsoft.Compute/virtualMachineScaleSets', parameters('vmSSName'))]",
                    "timeGrain": "PT1M",
                    "statistic": "Average",
                    "timeWindow": "PT5M",
                    "timeAggregation": "Average",
                    "operator": "LessThan",
                    "threshold": 30
                  },
                  "scaleAction": {
                    "direction": "Decrease",
                    "type": "ChangeCount",
                    "value": "1",
                    "cooldown": "PT1M"
                  }
                }
              ]
            }
          ]
        }
      }
    ]
  }

範本中定義了下列資源：

• Microsoft.Network/virtualNetworks
• Microsoft.Network/publicIPAddresses
• Microsoft.Network/loadBalancers
• Microsoft.Compute/virtualMachineScaleSets
• Microsoft.Insights/autoscaleSettings
• Microsoft.Network/networkSecurityGroups

定義擴展集

若要使用範本建立縮放，您可以定義適當的資源。 虛擬機器擴展集資源類型的核心部分是：

屬性	屬性描述	範例範本值
type	要建立的 Azure 資源類型	Microsoft.Compute/virtualMachineScaleSets
NAME	擴展集名稱	myScaleSet
location	要建立擴展集的位置	美國東部
sku.name	每個擴展集執行個體的 VM 大小	標準_A1
sku.capacity	最初要建立的 VM 執行個體數目	2
imageReference	要用於 VM 執行個體的平台或自訂映像	Canonical Ubuntu Server 16.04-LTS
osProfile.computerNamePrefix	每個 VM 執行個體的名稱前置詞	myvmss
osProfile.adminUsername	每個 VM 執行個體的使用者名稱	azureuser
osProfile.adminPassword	每個 VM 執行個體的密碼	P@ssw0rd!

若要自訂擴展集範本，您可以變更 VM 大小或初始容量， 或使用不同的平台或自訂映像。

新增範例應用程式

若要測試您的擴展集，請安裝基本的 Web 應用程式。 當您部署擴展集時，VM 延伸模組可以提供後置部署設定和自動化工作，例如安裝應用程式。 您可以從 Azure 儲存體或 GitHub 下載指令碼，或是在擴充功能執行階段將指令碼提供給 Azure 入口網站。 若要將延伸模組套用至擴展集，請將 extensionProfile 區段新增至上述資源範例。 延伸模組設定檔通常會定義下列屬性：

• 擴充功能類型
• 延伸模組發行者
• 延伸模組版本
• 設定或安裝指令碼的位置
• 在 VM 執行個體上執行的命令

範本會使用自訂指令碼延伸模組來安裝 Bottle、Python web 架構，以及簡單的 HTTP 伺服器。

fileUris 中定義的兩個指令碼 - installserver.sh 和 workserver.py。 會從 GitHub 下載這些檔案，然後 commandToExecute 會執行 bash installserver.sh來安裝和設定應用程式。

部署範本

您也可以使用 Azure CLI 部署 Resource Manager 範本：

# Create a resource group
az group create --name myResourceGroup --location EastUS

# Deploy template into resource group
az deployment group create -g myResourceGroup -f azuredeploy.json --parameters _artifactsLocation=https://raw.githubusercontent.com/Azure/azure-quickstart-templates/master/application-workloads/python/vmss-bottle-autoscale/azuredeploy.json

回答提示以提供擴展集名稱、執行個體計數和 VM 執行個體的管理員認證。 需要幾分鐘的時間才能建立擴展集和支援資源。

驗證部署

若要查看有效的擴展集，請在網頁瀏覽器中存取範例 Web 應用程式。 使用 az network public-ip list 取得負載平衡器的公用 IP 位址，如下所示：

az network public-ip list \
    --resource-group myResourceGroup \
    --query [*].ipAddress -o tsv

在網頁瀏覽器中輸入負載平衡器的公用 IP 位址，格式為 http://publicIpAddress:9000/do_work。 負載平衡器會將流量散發至您的其中一個 VM 執行個體，如下列範例所示：

清除資源

若不再需要，您可以使用 az group delete 移除資源群組、擴展集和所有相關資源，如下所示。 --no-wait 參數不會等待作業完成，就會將控制項傳回給提示字元。 --yes 參數會確認您想要刪除資源，而不另外對您提示將要進行此作業。

az group delete --name myResourceGroup --yes --no-wait

下一步

了解如何在Azure 入口網站中建立彈性擴展集。