Azure FrontDoor：如何设置内部有多个实例的后端池？

Question

我使用 ARM 模板启动基础架构即代码，之前我的所有部署都是使用 Powershell 进行的。希望你能帮我解决这个问题。

我想部署 {2 个应用服务 + Azure FrontDoor]。在 FrontDoor-Backendpool 中，我想定义 2 个应用程序服务。在我的代码下方：

{
"$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
"contentVersion": "1.0.0.0",
"parameters": {
    "location": {
        "type": "array",
        "metadata": {
            "description": "array of region"
        },
        "defaultValue": [
            "centralus",
            "eastus"
        ]
    },
    "Stage": {
        "type": "string",
        "metadata": {
            "description": "Stage dev, prod"
        },
        "allowedValues": [
            "Dev",
            "Prod"
        ],
        "defaultValue": "Dev"
    }
},
"functions": [],
"variables": {
    "appServicePlanName": "[concat('AppServicePlan-', parameters('Stage'),'-')]",
    "appServiceName": "[concat('AppService-', parameters('Stage'), '-')]",
    "frontDoorName": "[concat('FrontDoor-', parameters('Stage'), uniqueString(resourceGroup().id))]"
},
"resources": [
    { // App Service Plan
        "type": "Microsoft.Web/serverfarms",
        "name": "[concat(variables('appServicePlanName'),parameters('location')[copyIndex()])]",
        "apiVersion": "2018-02-01",
        "copy": {
            "count": "[length(parameters('location'))]",
            "name": "copy multiple"
        },
        "location": "[parameters('location')[copyIndex()]]",
        "sku": {
            "name": "F1",
            "capacity": 1
        },
        "tags": {
            "cost": "[parameters('Stage')]"
        },
        "properties": {
            "name": "[concat(variables('appServicePlanName'),parameters('location')[copyIndex()])]"
        }
    },
    { // App Services
        "type": "Microsoft.Web/sites",
        "name": "[concat(variables('appServiceName'), parameters('location')[copyIndex()])]",
        "apiVersion": "2018-11-01",
        "copy": {
            "name": "Copy website",
            "count": "[length(parameters('location'))]"
        },
        "location": "[parameters('location')[copyIndex()]]",
        "tags": {
            "cost": "[parameters('Stage')]"
        },
        "dependsOn": [
            "[resourceId('Microsoft.Web/serverfarms', concat(variables('appServicePlanName'),parameters('location')[copyIndex()]))]"
        ],
        "properties": {
            "name": "[concat(variables('appServiceName'), parameters('location')[copyIndex()])]",
            "serverFarmId": "[resourceId('Microsoft.Web/serverfarms', concat(variables('appServicePlanName'),parameters('location')[copyIndex()]))]"
        }
    },
    { // Front Door
        "type": "Microsoft.Network/frontDoors",
        "apiVersion": "2020-05-01",
        "name": "[variables('frontDoorName')]",
        "location": "global",
        "properties": {
            "routingRules": [
                {
                    "name": "routingRule1",
                    "properties": {
                        "frontendEndpoints": [
                            {
                                "id": "[resourceId('Microsoft.Network/frontDoors/frontendEndpoints', variables('frontDoorName'), 'frontendEndpoint1')]"
                            }
                        ],
                        "acceptedProtocols": [
                            "Http",
                            "Https"
                        ],
                        "patternsToMatch": [
                            "/*"
                        ],
                        "routeConfiguration": {
                            "@odata.type": "#Microsoft.Azure.FrontDoor.Models.FrontdoorForwardingConfiguration",
                            "forwardingProtocol": "MatchRequest",
                            "backendPool": {
                                "id": "[resourceId('Microsoft.Network/frontDoors/backendPools', variables('frontDoorName'), 'backendPool1')]"
                            }
                        },
                        "enabledState": "Enabled"
                    }
                }
            ],
            "healthProbeSettings": [
                {
                    "name": "healthProbeSettings1",
                    "properties": {
                        "path": "/",
                        "protocol": "Http",
                        "intervalInSeconds": 120
                    }
                }
            ],
            "loadBalancingSettings": [
                {
                    "name": "loadBalancingSettings1",
                    "properties": {
                        "sampleSize": 4,
                        "successfulSamplesRequired": 2
                    }
                }
            ],
            "backendPools": [
                {
                    "id": "backendPool1",
                    "name": "backendPool1",
                    "properties": {
                        "copy": [
                            {
                                "name": "backends",
                                "count": "[length(parameters('location'))]",
                                "input": {
                                    "address": "[concat(variables('appServiceName'), parameters('location')[copyIndex()], '.azurewebsites.net') ]",
                                    "httpPort": 80,
                                    "httpsPort": 443,
                                    "weight": 50,
                                    "priority": 1,
                                    "enabledState": "Enabled"
                                }
                            }
                        ],
                        "loadBalancingSettings": {
                            "id": "[resourceId('Microsoft.Network/frontDoors/loadBalancingSettings', variables('frontDoorName'), 'loadBalancingSettings1')]"
                        },
                        "healthProbeSettings": {
                            "id": "[resourceId('Microsoft.Network/frontDoors/healthProbeSettings', variables('frontDoorName'), 'healthProbeSettings1')]"
                        }
                    }
                }
            ],
            "frontendEndpoints": [
                {
                    "name": "frontendEndpoint1",
                    "properties": {
                        "hostName": "[concat(variables('frontDoorName'), '.azurefd.net')]",
                        "sessionAffinityEnabledState": "Enabled"
                    }
                }
            ],
            "enabledState": "Enabled"
        }
    }

],
"outputs": {}

}

如您所见，我在参数 location 上进行迭代以创建我的 AppService 计划和 AppService，它运行良好。所以我想对 BackEndpool 做同样的事情。

这是让我头疼的部分代码

address": "[concat(variables('appServiceName'), parameters('location')[copyIndex()], '.azurewebsites.net') ]",

里面有问题，但我不知道为什么。返回的错误是：错误：代码=无效模板； Message=部署模板语言表达式求值失败：'模板语言函数 'copyIndex' 的参数无效。资源中不存在提供的副本名称“”。请参阅 https://aka.ms/arm-copy for usage details.'. Please see https://aka.ms/arm-template-expressions 了解使用详情。

我的灵感来自 MS 官方文档 link from MS 关于如何修复它的任何想法？谢谢

Answer 1

您需要在 backendPools 部分对 copyIndex 的调用中包含 copy 名称属性。这就是为什么说“提供的副本名称 '' 不存在”。属性副本的处理方式与资源副本略有不同。

"loopName 属性使您能够指定 copyIndex 是指资源迭代还是属性迭代。如果没有为 loopName 提供值，则使用当前资源类型迭代。提供在属性上迭代时 loopName 的值。” 资料来源：https://docs.microsoft.com/en-us/azure/azure-resource-manager/templates/template-functions-numeric#copyindex

parameters('location')[copyIndex('backends')]

Azure FrontDoor：如何设置内部有多个实例的后端池？

Azure FrontDoor: how to set up backendPool with multiple instance inside?

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