我怎樣才能創建Cloudformation模板參數IAM角色下拉

Question

我正在尋找一種方式，列出在Cloudformation模板的現有IAM角色以類似的方式，以上市說EC2密鑰對。下面是什麼，我既EC2密鑰對和IAM角色試圖然而Cloudformation拋出一個錯誤，指出「角色名」不存在的例子。

"KeyName": { 
    "Description" : "Choose a Key Pair that is available in this region", 
    "Type": "AWS::EC2::KeyPair::KeyName", 
    "ConstraintDescription": "Must be the name of an existing EC2 Key Pair" 
}, 
"ServiceRole": { 
    "Description" : "Choose an IAM Role that is available in this region", 
    "Type": "AWS::IAM::Role::RoleName", 
    "ConstraintDescription": "Must be the name of an existing IAM Role" 
}, 

Screenshot of Cloudformation Interface 任何想法，如果這是可能實現的？

Answer 1

並非所有類型在下拉列表的支持，IAM角色是不支持的類型。所以你無法獲得IAM角色的下拉菜單。相反，你將不得不使用一個簡單的文本框。

這裏是一個支持的參數類型的當前列表：

• String
• Number
• List<Number>
• CommaDelimitedList
• AWS::EC2::AvailabilityZone::Name
• AWS::EC2::Image::Id
• AWS::EC2::Instance::Id
• AWS::EC2::KeyPair::KeyName
• AWS::EC2::SecurityGroup::GroupName
• AWS::EC2::SecurityGroup::Id
• AWS::EC2::Subnet::Id
• AWS::EC2::Volume::Id
• AWS::EC2::VPC::Id
• AWS::Route53::HostedZone::Id
• List<AWS::EC2::AvailabilityZone::Name>
• List<AWS::EC2::Image::Id>
• List<AWS::EC2::Instance::Id>
• List<AWS::EC2::SecurityGroup::GroupName>
• List<AWS::EC2::SecurityGroup::Id>
• List<AWS::EC2::Subnet::Id>
• List<AWS::EC2::Volume::Id>
• List<AWS::EC2::VPC::Id>
• List<AWS::Route53::HostedZone::Id>

來源：http://docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/parameters-section-structure.html