aws-cloudformation - EC2 实例 - cloudformation 模板 - 给出错误 "Template validation error: Template error: Unable to get mapping for RegionMap::us-west-2::AMI"

Question

我编写了一个简单的 Cloudformation 模板来使用“映射”。以下是代码。我已登录 us-west-2a (西海岸)并运行我的模板。我有 3 个默认子网。我在映射部分提供的 AMI 是由我创建的:

我预计当我输入 us-west-2a 作为参数时，它应该按照下面的代码选择 ami-fcccdf85 。但它说

模板错误:无法获取 RegionMap::us-west-2::AMI 的映射

 "RegionMap" : {
            "us-east-1"      : { "AMI" : "ami-48b4bf31" },
            "us-west-2a"      : { "AMI" : "ami-fcccdf85" },
            "us-west-1"      : { "AMI" : "ami-48b4bf31" }     
        }

代码:

{
"AWSTemplateFormatVersion": "2010-09-09",
"Description": "EC2 Head Node Instance ",
"Parameters": {
    "AvailabilityZone": {
        "Description": "Availablity Zone",
        "Type": "String"

    },
    "Region":{
        "Description": "Dev/Test/Prod regions",
        "Type": "String"
    },

    "Subnet": {
        "Description": "subnet to launch virtual server in",
        "Type": "AWS::EC2::Subnet::Id"
    }

},
"Mappings" : {
        "RegionMap" : {
            "us-east-1"      : { "AMI" : "ami-48b4bf31" },
            "us-west-2a"      : { "AMI" : "ami-fcccdf85" },
            "us-west-1"      : { "AMI" : "ami-48b4bf31" }     
        }
    },

"Resources": {
    "EC2Instance": {
        "Type": "AWS::EC2::Instance",
        "Properties": {
            "ImageId" : { "Fn::FindInMap" : [ "RegionMap", { "Ref" : "AWS::Region" }, "AMI" ]},
            "SubnetId": {"Ref": "Subnet"},
            "AvailabilityZone": {"Ref": "AvailabilityZone"},
            "Tags": [
                {
                    "Key": "Name",
                    "Value": "Head Node in DEV region"
                }
            ]
            }
        }

},
"Outputs": {
    "InstanceId": {
        "Value": {"Ref": "EC2Instance"},
        "Description": "ID of virtual server"
    },

    "PublicIPAddress": {
        "Value": {"Fn::GetAtt": ["EC2Instance", "PublicIp"]},
        "Description": "public IP address of virtual server"
    }
   }
}

请问有什么建议吗？

Answer 1

您输入的“us-west-2a”删除了 a 应为“us-west-2”的 AMI 是特定于区域的，而不是特定于 AZ(可用区)的，换句话说，您必须指定一个区域。