如何在 CloudFormation 模板中使用來自 SSM StringList 的值？

Question

假設我在 SSM ParameterStore 中有一個參數。 該參數有一個 StringList 作為值並描述一個服務，例如 (bucket_name, request_url)

"serviceA" = "bucket_name_A, https://www.request.com/A"

現在，在 CloudFormation 中，我想從這個字符串列表中定義我的存儲桶的名稱。

"S3FTSE100Intraday1min": {
            "Type": "AWS::S3::Bucket",
            "Properties": {
                "BucketName": {
                    "Fn::GetAtt": [
                        "My_SSM_ParameterStore_Logical_ID",
                        "Value"
                    ]
                },
                ...

但顯然這將返回完整的bucket_name_A ，而不僅僅是bucket_name_A

如何訪問要在 CloudFormation 模板中使用的字符串列表中的參數之一？

Answer 1

在起草這個問題時，我開始研究 Fn:: 方法

（來源： https : //docs.aws.amazon.com/AWSCloudFormation/latest/UserGuide/intrinsic-function-reference-split.html ）

我有一個想法：

"bucket_name_A, https://www.request.com/A"是： "bucket_name_A, https://www.request.com/A" : "bucket_name_A, https://www.request.com/A"

• 使用Fn::GetAtt => "bucket_name_A, https://www.request.com/A"檢索Fn::GetAtt列表值
• 使用Fn::Split => ["bucket_name_A", "https://www.request.com/A"]將其拆分為一個列表
• 使用Fn::Select => "bucket_name_A"選擇第一個值

它有效！ 下面是cloudformation模板：

SSM Parameter Store ：

"SSMTestBucketName": {
            "Type": "AWS::SSM::Parameter",
            "Properties": {
                "Name": "StringList_Test_Bucket_Name",
                "Type": "StringList",
                "Value": "test-ssm-stringlist-bucket, https://www.requesturl.com"
            }
        }

S3 Bucket ：

"S3TestBucket": {
            "Type": "AWS::S3::Bucket",
            "Properties": {
                "BucketName": {
                    "Fn::Select": [
                        "0",
                        {
                            "Fn::Split": [
                                ",",
                                {
                                    "Fn::GetAtt": [
                                        "SSMTestBucketName",
                                        "Value"
                                    ]
                                }
                            ]
                        }
                    ]
                },
                "BucketEncryption": {
                    "ServerSideEncryptionConfiguration": [
                        {
                            "ServerSideEncryptionByDefault": {
                                "SSEAlgorithm": "AES256"
                            }
                        }
                    ]
                },
                "PublicAccessBlockConfiguration": {
                    "BlockPublicAcls": true,
                    "BlockPublicPolicy": true,
                    "IgnorePublicAcls": true,
                    "RestrictPublicBuckets": true
                },
                "LifecycleConfiguration": {
                    "Rules": [
                        {
                            "Status": "Enabled",
                            "Transitions": [
                                {
                                    "TransitionInDays": "30",
                                    "StorageClass": "STANDARD_IA"
                                }
                            ]
                        }
                    ]
                }
            }
        }