如何将列表传递给AWS CloudFormation中的嵌套堆栈参数？

Question

我使用嵌套堆栈来创建电子束和应用程序stacks...And，我需要将子网列表传递给电子束和应用程序栈。

主要的json有以下代码..。

"Mappings":{
        "params":{

              "Subnets": {
                    "dev":[
                "subnet-1”,
                "subnet-2”
                ],
                   "test":[
                "subnet-3”,
                "subnet-4”,
                "subnet-5”,
                "subnet-6”
                ],

            "prod":[
                "subnet-7”,
                "subnet-8”,
                "subnet-9”
                ]
                }
        }
      },
 "Parameters":{
    "Environment":{
      "AllowedValues":[
        "prod",
        "preprod",
        "dev"
      ],
      "Default":"prod",
      "Description":"What environment type is it (prod, preprod, test, dev)?",
      "Type":"String"
    }
},
        Resources:{
         "ELBStack": {
               "Type": "AWS::CloudFormation::Stack",
               "Properties": {
                 "TemplateURL": {
                   "Fn::Join":[
                     "",
                     [
                       "https://s3.amazonaws.com/",
                       "myS3bucket",
                       "/ELB.json"
                     ]
                   ]
                 },
                 "Parameters": {
                   "Environment":{"Ref":"Environment"},

                   "ELBSHORTNAME":{"Ref":"ELBSHORTNAME"},
                   "Subnets":{"Fn::FindInMap":[
                                  "params",
                                  "Subnets",
                                  {
                                    "Ref":"Environment"
                                  }
                                ]},
                   "S3Bucket":{"Ref":"S3Bucket"},

                 },
                 "TimeoutInMinutes": "60"
               }
        }

现在，当我使用lambda或cloudformation运行这个json时，我在cloudformation下得到以下错误.

 CREATE_FAILED AWS::CloudFormation::Stack   ELBStack    Value of property Parameters must be an object with String (or simple type) properties

using below lambda


import boto3
import time

date = time.strftime("%Y%m%d")
time = time.strftime("%H%M%S")
stackname = 'FulfillSNSELB'
client = boto3.client('cloudformation')
response = client.create_stack(
    StackName= (stackname + '-' + date + '-' + time),
    TemplateURL='https://s3.amazonaws.com/****/**/myapp.json',
    Parameters=[
        {
            'ParameterKey': 'Environment',
            'ParameterValue': 'dev',
            'UsePreviousValue': False
        }]
)

def lambda_handler(event, context):
    return(response)

Answer 1

您的JSON格式不太好。通过aws cloudformation validate-template (甚至jsonlint.com)运行JSON会很快发现几个基本的语法错误：

1. Resources:{要求密钥被引号包围："Resources": {
2. 有些引号是无效的“智能引号”"subnet-1”,，需要用标准的ASCII引号："subnet-1",替换。
3. (这是您的错误消息所引用的) "ELBStack“资源"S3Object: {"Ref: "S3Bucket"},"中的"S3Object: {"Ref: "S3Bucket"},"对象在其最后一个需要删除的元素之后有一个后缀逗号："S3Object: {"Ref: "S3Bucket"}"

Answer 2

不能将列表传递给嵌套堆栈。您必须将项与内部函数加入连接起来，如下所示：!Join ["separator", [item1, item2, …]]。

在嵌套堆栈中，参数的类型需要是List<Type>。