内部函数引用DeletionPolicy和UpdateReplacePolicy属性 - Amazon CloudFormation
声明参数示例支持的函数
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内部函数引用DeletionPolicy和UpdateReplacePolicy属性

在 Amazon CloudFormation 模板中添加 AWS::LanguageExtensions 转换时，您可以使用内部函数来定义 DeletionPolicy 属性 和 UpdateReplacePolicy 属性 资源属性。

注意

内部函数必须解析为有效的 DeletionPolicy 选项 或 UpdateReplacePolicy 选项。

声明

JSON

{ "DeletionPolicy": IntrinsicFunction }
{ "UpdateReplacePolicy": IntrinsicFunction }

YAML

DeletionPolicy: IntrinsicFunction
UpdateReplacePolicy: IntrinsicFunction

参数

IntrinsicFunction

解析为有效DeletionPolicy 属性或UpdateReplacePolicy 属性选项的内部函数。

示例

定义DeletionPolicy和UpdateReplacePolicy使用Fn:If内部函数

以下示例根据 Fn::If 内部函数中定义的条件设置 DeletionPolicy 属性 和 UpdateReplacePolicy 属性 属性。如果 Stage 参数为 Prod，则 DeletionPolicy 和 UpdateReplacePolicy 属性将设置为 Retain。

JSON

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Transform": "AWS::LanguageExtensions",
    "Parameters": {
        "Stage": {
            "Type": "String",
            "AllowedValues": [
                "Prod",
                "Staging",
                "Dev"
            ]
        }
    },
    "Conditions": {
        "IsProd": {
            "Fn::Equals": [
                {
                    "Ref": "Stage"
                },
                "Prod"
            ]
        }
    },
    "Resources": {
        "Table": {
            "Type": "AWS::DynamoDB::Table",
            "Properties": {
                "KeySchema": [{
                    "AttributeName": "primaryKey",
                    "KeyType": "HASH"
                }],
                "AttributeDefinitions": [{
                        "AttributeName": "primaryKey",
                        "AttributeType": "S"
                }]
            },
            "DeletionPolicy": {
                "Fn::If": [
                    "IsProd",
                    "Retain",
                    "Delete"
                ]
            },
            "UpdateReplacePolicy": {
                "Fn::If": [
                    "IsProd",
                    "Retain",
                    "Delete"
                ]
            }
        }
    }
}

YAML

AWSTemplateFormatVersion: 2010-09-09
Transform: 'AWS::LanguageExtensions'
Parameters:
  Stage:
    Type: String
    AllowedValues:
      - Prod
      - Staging
      - Dev
Conditions:
  IsProd: !Equals 
    - !Ref Stage
    - Prod
Resources:
  Table:
    Type: 'AWS::DynamoDB::Table'
    Properties:
      KeySchema:
        - AttributeName: primaryKey
          KeyType: HASH
      AttributeDefinitions:
        - AttributeName: primaryKey
          AttributeType: S
    DeletionPolicy: !If 
      - IsProd
      - Retain
      - Delete
    UpdateReplacePolicy: !If 
      - IsProd
      - Retain
      - Delete

使用Ref内部函数定义DeletionPolicy和UpdateReplacePolicy属性

以下示例根据 Ref 内部函数解析的值设置 DeletionPolicy 属性 和 UpdateReplacePolicy 属性 属性。如果 DeletionPolicyParam 和 UpdateReplacePolicyParam 参数均设置为 Retain，则 DeletionPolicy 和 UpdateReplacePolicy 属性也设置为 Retain。

JSON

{
    "AWSTemplateFormatVersion": "2010-09-09",
    "Transform": "AWS::LanguageExtensions",
    "Parameters": {
        "DeletionPolicyParam": {
            "Type": "String",
            "AllowedValues": [
                "Delete",
                "Retain",
                "Snapshot"
            ],
            "Default": "Delete"
        },
        "UpdateReplacePolicyParam": {
            "Type": "String",
            "AllowedValues": [
                "Delete",
                "Retain",
                "Snapshot"
            ],
            "Default": "Delete"
        }
    },
    "Resources": {
        "Table": {
            "Type": "AWS::DynamoDB::Table",
            "Properties": {
                "KeySchema": [
                    {
                        "AttributeName": "primaryKey",
                        "KeyType": "HASH"
                }],
                "AttributeDefinitions": [{
                    "AttributeName": "primaryKey",
                    "AttributeType": "S"
                }]
            },
            "DeletionPolicy": {
                "Ref": "DeletionPolicyParam"
            },
            "UpdateReplacePolicy": {
                "Ref": "UpdateReplacePolicyParam"
            }
        }
    }
}

YAML

AWSTemplateFormatVersion: 2010-09-09
Transform: 'AWS::LanguageExtensions'
Parameters:
  DeletionPolicyParam:
    Type: String
    AllowedValues:
      - Delete
      - Retain
      - Snapshot
    Default: Delete
  UpdateReplacePolicyParam:
    Type: String
    AllowedValues:
      - Delete
      - Retain
      - Snapshot
    Default: Delete
Resources:
  Table:
    Type: 'AWS::DynamoDB::Table'
    Properties:
      KeySchema:
        - AttributeName: primaryKey
          KeyType: HASH
      AttributeDefinitions:
        - AttributeName: primaryKey
          AttributeType: S
    DeletionPolicy: !Ref DeletionPolicyParam
    UpdateReplacePolicy: !Ref UpdateReplacePolicyParam

支持的函数

在 DeletionPolicy 或 UpdateReplacePolicy 属性中，您可以使用以下函数：

您还可以使用以下伪参数：

  • AWS::AccountId

  • AWS::Partition

  • AWS::Region