如何在 CloudFormation 中获取 SSM 文档的 ARN？

Question

我有一个 CloudFormation 模板，可以创建一个 AWS::Events::Rule 和一个 AWS::SSM::Document。我需要为SSM::Rule 提供Targets 的列表，但每个目标都需要一个ARN：

mySSMDocument:
  Type: AWS::SSM::Document
  Properties:
    DocumentType: 'Command'
    Content:
      schemaVersion: '2.2'
      description: "Code that will be run on EC2"
      mainSteps:
        - action: "aws:runShellScript"
          name: runShellScript
          inputs:
            runCommand:
              - 'Some command to execute'
myEventRule:
  Type: AWS::Events::Rule
  Properties:
    Description: "A description for the Rule."
    EventPattern: 
      source:
        - "aws.autoscaling"
      detail-type:
        - "EC2 Instance-terminate Lifecycle Action"
      detail:
        AutoScalingGroupName:
          - !Ref 'someAutoScalingGroupInThisTemplate'
    RoleArn: 'some role ARN'
    State: "ENABLED"
    Targets:
      - Id: "some-unique-id"
        Arn: <-- This is the value that I need to fill in.
        RunCommandParameters:
          RunCommandTargets:
            - Key: "tag: Name"
              Values:
                - 'The name of the EC2 machine'

我认为我需要将<-- This is the value that I need to fill in. 替换为mySSMDocument 的ARN，但我看不到任何从模板本身中检索此值的方法。 The documentation 没有在SSM::Document 上指定任何允许获取ARN 的GetAtt 功能。有谁知道如何解决这个问题？

Answer 1

这是文档的 ARN 模式

arn:${Partition}:ssm:${Region}:${Account}:document/${DocumentName}

示例：

arn:aws:ssm:us-east-2:12345678912:document/demoooo

您可以使用Ref 函数获取文档名称，然后使用Sub 创建最终的 ARN

参考：https://docs.aws.amazon.com/IAM/latest/UserGuide/list_awssystemsmanager.html#awssystemsmanager-resources-for-iam-policies

Answer 2

!Sub arn:${AWS::Partition}:ssm:${AWS::Region}:${AWS::AccountId}:document/${mySSMDocument}

您可以使用return Value for AWS::SSM::Document、Pseudo Parameters for Partition, Region, and AccountId 和Sub intrinsic function 生成ARN format for AWS::SSM::Document