Templates AWS Cloudformation:Fn::在Fn::FindInMap语句中联接?
正在尝试在Fn::FindInMap中使用Fn::Join,如下所示:Templates AWS Cloudformation:Fn::在Fn::FindInMap语句中联接?,templates,amazon-web-services,amazon-cloudformation,Templates,Amazon Web Services,Amazon Cloudformation,正在尝试在Fn::FindInMap中使用Fn::Join,如下所示: "SubnetId": { "Fn::FindInMap": [ { "Ref": "OrganizationName" }, "AZ", { "Fn::Join": [ "", [ {
"SubnetId": {
"Fn::FindInMap": [
{
"Ref": "OrganizationName"
},
"AZ",
{
"Fn::Join": [
"",
[
{
"Ref": "Environment"
},
{
"Ref": "Member1AZ"
}
]
]
}
]
}
OrganizationName、Environment和Member1AZ都是参数。本质上,它应该连接到我的映射并生成,例如:
"SubnetId" : { "Fn::FindInMap" : [ "Organization2", "AZ", "prod1c" ]}
但是,它似乎没有将Fn::Join的输出作为Fn::FindInMap上的单个实体,如果我硬编码模板的该部分,它将正确验证
A client error (ValidationError) occurred when calling the ValidateTemplate operation: Template error: every Fn::FindInMap object requires three parameters, the map name, map key and the attribute for return value
我的映射如下:
Mappings" : {
"OrganizationDefaults" : {
"AZ" : {
"prod1a" : "subnet-foobar1",
"qa1a" : "subnet-foobar2",
"prod1c" : "subnet-foobar3",
"qa1c" : "subnet-foobar4"
}
},
"OrganizationTwo" : {
"AZ" : {
"prod1a" : "subnet-foobar5",
"qa1a" : "subnet-foobar6",
"prod1c" : "subnet-foobar7",
"qa1c" : "subnet-foobar8"
}
},
},
有人能帮上忙吗,或者以前做过类似的事情吗?对于列出的任何组织,我都需要使用相同的模板,因此映射应该可以为我解决这个问题,如果我能正确地做到这一点。我建议您重构映射,以避免嵌套的Fn::Join
Mappings" : {
"OrganizationDefaults" : {
"1a" : {
"prod" : "subnet-foobar1",
"qa" : "subnet-foobar2"
},
"1c"
"prod" : "subnet-foobar3",
"qa" : "subnet-foobar4"
}
},
"OrganizationTwo" : {
"1a" : {
"prod" : "subnet-foobar5",
"qa" : "subnet-foobar6"
},
"1c" : {
"prod" : "subnet-foobar7",
"qa" : "subnet-foobar8"
}
},
},
这简化了您的参考
"SubnetId" : { "Fn::FindInMap" : [ { "Ref" : "OrganizationName" }, { "Ref" : "Member1AZ" }, { "Ref" : "Environment" }]}
虽然我同意@Jason的观点,在您的情况下,地图布局的重构是您的最佳解决方案,但在有些情况下,CloudFormation中地图的2D限制可能会受到限制,因此我将在这里发布一个可能的解决方案 截至本文发布之日,内在函数仅支持以下嵌套函数:
Fn::FindInMap
Ref
Join
会给您带来上面发布的稍微隐晦的错误。但是,由于可以嵌套FindInMap
调用,因此可以通过创建另一个查找映射来实现映射的“第三维”:
Mappings" : {
"OrganizationDefaults" : {
"AZ" : {
"prod1a" : "subnet-foobar1",
"qa1a" : "subnet-foobar2",
"prod1c" : "subnet-foobar3",
"qa1c" : "subnet-foobar4"
}
},
"OrganizationTwo" : {
"AZ" : {
"prod1a" : "subnet-foobar5",
"qa1a" : "subnet-foobar6",
"prod1c" : "subnet-foobar7",
"qa1c" : "subnet-foobar8"
}
},
"EnvMemberMap" : {
"prod": {
"1a" : "prod1a",
"1c" : "prod1c",
},
"qa": {
"1a" : "qa1a",
"1c" : "qa1c",
}
}
},
然后按如下方式执行地图检索:
"SubnetId": {
"Fn::FindInMap": [
{
"Ref": "OrganizationName"
},
"AZ",
{
"Fn::FindInMap": [
"EnvMemberMap",
{
"Ref": "Environment"
},
{
"Ref": "Member1AZ"
}
]
}
]
}
同意,这意味着如果需要为映射执行字符串concat,则可以将其拆分为多个映射。