[英]CloudFormation — possible to have nested Mappings?
Is it possible to have nested Mappings in CloudFormation, like the following example?是否可以在 CloudFormation 中嵌套映射,如下例所示?
"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"
}
}
}
}
}
When I attempt to do something like this, I get the following error:当我尝试做这样的事情时,我收到以下错误:
Template format error: Every Mappings attribute must be a String or a List.模板格式错误:每个映射属性都必须是字符串或列表。
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)?如果嵌套映射是不可能的,那么在需要选择两个参数的 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)?
I ended up doing it like this:我最终这样做了:
"Mappings" :
{
"dev" :
{
"us-east-1" :
{
"ImageId" : "something",
"Subnet" : "something"
},
"us-west-2" :
{
"ImageId" : "something",
"Subnet" : "something"
}
},
"qa" :
{
"us-east-1" :
{
"ImageId" : "something",
"Subnet" : "something"
},
"us-west-2" :
{
"ImageId" : "something",
"Subnet" : "something"
}
}
}
The important point here is that the objects alternate between "mappings" and keys". So in this situation, "dev" is a Mapping, "us-east-1" is a key, "ImageId" is a mapping, and "something" is a key. Mapping names cannot have non-alphanumeric characters, so Region names cannot be Mappings. Thus, using the environment as the first parameter and using the region name as the second parameter is mandatory.这里的重点是对象在“映射”和“键”之间交替。所以在这种情况下,“dev”是一个映射,“us-east-1”是一个键,“ImageId”是一个映射,而“东西" 是一个键。映射名称不能有非字母数字字符,所以区域名称不能是映射。因此,使用环境作为第一个参数,使用区域名称作为第二个参数是强制性的。
It seems to me like the Mappings section of CloudFormation has a lot of really strange arbitrary rules, and it surprises me that it isn't more flexible, but there you have it.在我看来,CloudFormation 的 Mappings 部分有很多非常奇怪的任意规则,令我惊讶的是它并没有更灵活,但你有它。
Faced the same issue.面临同样的问题。 Found the following in the Fn::FindInMap documentation在Fn::FindInMap 文档中找到以下内容
The intrinsic function Fn::FindInMap returns the value corresponding to keys in a two-level map that is declared in the Mappings section.内部函数 Fn::FindInMap 返回与在 Mappings 部分声明的两级映射中的键对应的值。
So basically:所以基本上:
The following will work:以下将起作用:
Mappings:
map_name:
level_1_key:
level_2_key:
"value"
But 3 levels won't.但是3级不会。
Mappings:
map_name:
level_1_key:
level_2_key:
level_3_key:
"value"
Something like this:像这样的东西:
"ImageMap" : {
"us-east-1" : { "dev" : "ami-11111111", "qa" : "ami-22222222" },
"us-west-1" : { "dev" : "ami-33333333", "qa" : "ami-44444444" }
}
and then to access these values:然后访问这些值:
"Value" : {
"Fn::FindInMap" : [
"ImageMap", { "Ref" : "AWS::Region" }, { "Ref" : "EnvironmentType" }
]
}
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