Question

我按照此tutorial设置了一个AWS Lambda函数，该函数在上传到S3时调用并填充DynamoDB。

我尝试使用AWS SAM来实现相同的功能，我需要使用配置信息定义template.yaml文件。使用Cloudformation进行部署时，我一直收到此错误 -

Failed to create the changeset: Waiter ChangeSetCreateComplete failed: Waiter encountered a terminal failure state Status: FAILED. Reason: Circular dependency between resources: [LambdaPerm]

我找不到很多关于此的信息，所以我很难调试。导致此错误的原因是什么？如何解决此问题？这是我的模板配置 -

AWSTemplateFormatVersion: '2010-09-09'
Transform: AWS::Serverless-2016-10-31
Resources:
  Gradebook:
    Type: AWS::Serverless::Function
    Properties:
      FunctionName: LambdaGradebookServerless
      Handler: serverless.LambdaGradebook
      Runtime: java8
      CodeUri: ./target/serverless-0.0.1-SNAPSHOT.jar
      Role: arn:aws:iam::xxxxxxxxxxxx:role/lambda-s3-execution-role
  LambdaPerm:
    Type: AWS::Lambda::Permission
    Properties:
      Action: lambda:InvokeFunction
      FunctionName:
        Ref: Gradebook
      Principal: s3.amazonaws.com
      SourceAccount:
        Ref: AWS::xxxxxxxxxxxx
      SourceArn:
        Fn::Join:
        - ':'
        - - arn
          - aws
          - s3
          - ''
          - ''
          - Ref: gradebookBucket
  gradebookBucket:
    Type: AWS::S3::Bucket
    Properties:
      Bucket: gradebook-lambda
      NotificationConfiguration:
        LambdaConfigurations:
        - Event: s3:ObjectCreated:*
          Function:
            Ref: Gradebook

Answer 1

要避免此循环依赖关系，请单独创建S3存储桶和Lambda函数，然后使用S3 notification configuration更新堆栈。

Answer 2

我得到了循环依赖性错误，结果发现它是我从CloudFormation模板上的资源引用的缺少参数！。

AWS SAM - 资源之间的循环依赖性错误

2 个答案: