AWS Cloudformation 参数允许值

Question

我正在 AWS Cloudformation 中创建一个堆栈来构建 EC2 实例。因此我需要用户输入某些参数。我的任务是在不同类型之间进行选择。根据这些类型，相应的值将显示在另一个列表中。

我想我可以用以下代码（包括映射）解决这个问题：

"Parameters": {
    "ProjectName": {
        "Description": "Enter the project name.",
        "Type": "String"
    },
    "InstanceType": {
        "Description": "Select your Instance type.",
        "AllowedValues": [
            "t3",
            "m5",
            "r5"
        ],
        "Default": "t3",
        "Type": "String"
    },
    "InstanceTypeSize": {
        "Description": "Select your Instance type size.",
        "AllowedValues":{
            "Fn::Split" : [
                ",",
                    { "Fn::FindInMap": [
                        "Params",
                        {"Ref": "InstanceType"},
                        "values"
                    ]}
                ]
            },
        "Type": "String"
    }
},
"Mappings": {
    "Params": {
        "t3": {
            "values": "t3.nano,t3.micro,t3.small,t3.medium,t3.large,t3.xlarge,t3.2xlarge"
        },
        "m5": {
            "values": "m5.large,m5.xlarge,m5.2xlarge,m5.4xlarge,m5.8xlarge,m5.12xlarge,m5.16xlarge,m5.24xlarge,m5.metal"
        },
        "r5": {
            "values": "r5.large,r5.xlarge,r5.2xlarge,r5.4xlarge,r5.8xlarge,r5.12xlarge,r5.16xlarge,r5.24xlarge,r5.metal"
        }
    }
}

Split

方法返回字符串列表。参数

"AllowedValues"

需要“包含参数允许的值列表的数组”。

有人知道我做错了什么或者错误出在哪里吗？问题是否有替代解决方案？

Answer 1

内部函数Ref不能在Parameters

内部使用

                 { "Fn::FindInMap": [
                        "Params",
                        {"Ref": "InstanceType"},
                        "values"
                    ]}

您必须将实例类型定义为一个大数组

"Parameters": {
    "ProjectName": {
        "Description": "Enter the project name.",
        "Type": "String"
    },
    "InstanceType": {
        "Description": "Select your Instance type.",
        "AllowedValues": [t3.nano,t3.micro,t3.small,t3.medium,t3.large,t3.xlarge,t3.2xlarge,m5.large,m5.xlarge,m5.2xlarge,m5.4xlarge,m5.8xlarge,m5.12xlarge,m5.16xlarge,m5.24xlarge,m5.metal,r5.large,r5.xlarge,r5.2xlarge,r5.4xlarge,r5.8xlarge,r5.12xlarge,r5.16xlarge,r5.24xlarge,r5.metal
        ],
        "Default": "t3",
        "Type": "String"
    },
    "InstanceTypeSize": {
        "Description": "Select your Instance type size.",
        "AllowedValues":{ 
            "Fn::Split" : [
                ",", 
                    { "Fn::FindInMap": [
                        "Params",
                        {"Ref": "InstanceType"},
                        "values"
                    ]}
                ]
            },
        "Type": "String"
    }
}