你能在ARM模板中做嵌套复制循环吗？

Question

我正在尝试动态生成路径映射，以便将传入流量路由到App Gateway的正确后端池。

例如，我们有20个租户，我们允许每个后端池有5个租户，这意味着我们将生成4个后端池。

我需要动态创建路径映射，使后端池1服务于租户1-5，后端池2服务于租户6-10，依此类推。

我想要生成的期望数组是：

[
    [ "tenant1", "tenant2", "tenant3", "tenant4", "tenant5"],
    ["tenant6", "tenant7", "tenant8", "tenant9", "tenant10"],
    ["tenant11", "tenant12", "tenant13", "tenant14", "tenant15"],
    ["tenant16", "tenant17", "tenant18", "tenant19", "tenant20"]
]

有了这个数组，我就可以创建后端池并连接子数组字符串，以形成所需的路径映射。

下面是其中一个尝试的快速原型。

{
  "$schema": "https://schema.management.azure.com/schemas/2015-01-01/deploymentTemplate.json#",
  "contentVersion": "1.0.0.0",
  "parameters": {
  },
  "variables": {
    "totalTenants": 20,
    "tenantsPerBackendPool": 5,
    "copy": [
      {
        "name": "outerCopy",
        "count": "[div(variables('totalTenants'), variables('tenantsPerBackendPool'))]",
        "input": {
          "copy": {
            "count": "[variables('totalTenants')]",
            "name": "innerCopy",
            "input": "[if(equals(div(copyIndex('innerCopy'), 5), copyIndex('outerCopy')), concat('/tenant', copyIndex('innerCopy'), '/*'), json('null'))]"
          }
        }
      }
    ]
  },
  "resources": [
    // Multiple backend pools will be created here, and use the path mappings to route correctly
  ],
  "outputs": {
    "pathMappings": {
      "type": "array",
      "value": "[variables('outerCopy')]"
    }
  }
}

然而，我得到了以下异常：New-AzResourceGroupDeployment: 16:01:18 - Error: Code=InvalidTemplate; Message=Deployment template language expression evaluation failed: 'The template language function 'copyIndex' has an invalid argument. The provided copy name 'innerCopy' doesn't exist in the resource.

Answer 1

我很确定你不能在操作中使用嵌套方法，但我认为你可以生成你想要的数组数组：

{
    "$schema": "https://schema.management.azure.com/schemas/2019-04-01/deploymentTemplate.json#",
    "contentVersion": "1.0.0.0",
    "parameters": {},
    "variables": {
        "totalTenants": 20,
        "tenantsPerBackendPool": 5,
        "copy": [
            {
                "name": "firstPass",
                "count": "[variables('totalTenants')]",
                "input": "[concat('/tenant', copyIndex('firstPass', 1), '/*')]"
            },
            {
                "name": "finalpass",
                "count": "[div(variables('totalTenants'), variables('tenantsPerBackendPool'))]",
                "input": "[take(skip(variables('firstPass'), mul(variables('tenantsPerBackendPool'), copyIndex('finalPass'))), variables('tenantsPerBackendPool'))]"
            }
        ]
    },
    "resources": [ ],
    "outputs": {
        "firstPass": {
            "type": "array",
            "value": "[variables('firstPass')]"
        },
        "finalPass": {
            "type": "array",
            "value": "[variables('finalpass')]"
        }
    }
}

有帮助吗？