CloudFormation-可能具有嵌套映射？ [英] CloudFormation -- possible to have nested Mappings?

问题描述

是否可以像下面的示例一样在CloudFormation中嵌套映射？

Is it possible to have nested Mappings in CloudFormation, like the following example?

"Mappings" :  
{
    "Regions" : 
    {
        "us-east-1" : 
        {
            "Environments" :
            {
                "dev" : 
                {
                    "ImageId" : "something",
                    "Subnet" : "something"
                },
                "qa" :
                {
                    "ImageId" : "something",
                    "Subnet" : "something"
                }
            }
        },
        "us-west-2" : 
        {
            "Environments" :
            {
                "dev" : 
                {
                    "ImageId" : "something",
                    "Subnet" : "something"
                },
                "qa" :
                {
                    "ImageId" : "something",
                    "Subnet" : "something"
                }
            }
        }
    }
}

当我尝试执行此类操作时，出现以下错误：

When I attempt to do something like this, I get the following error:

模板格式错误：每个Mappings属性必须为字符串或列表。

Template format error: Every Mappings attribute must be a String or a List.

如果嵌套映射不可能，那么在需要两个参数选择的CFT中存储值的最佳方法是什么（例如，取决于两个区域和环境的值）？

If nested Mappings aren't possible, then what is the best way to store values in a CFT that require two parameters to select (such as values that depend on BOTH Region and environment)?

推荐答案

类似这样的东西：

"ImageMap" : {
    "us-east-1" : { "dev" : "ami-11111111", "qa" : "ami-22222222" },
    "us-west-1" : { "dev" : "ami-33333333", "qa" : "ami-44444444" }
 }

然后访问这些值：

"Value" : {
    "Fn::FindInMap" : [
        "ImageMap", { "Ref" : "AWS::Region" }, { "Ref" : "EnvironmentType" }
    ]
}

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