amazon-web-services - 如果存储桶存在，如何强制 CloudFormation 创建一个具有相似名称的新存储桶？

Question

有人可以帮助我如何制作一个模板，其中 cloudformation 自动创建一个具有相似名称的新存储桶。例如，如果我的存储桶的名称是 myownbucket，cloudformation 是否可以自动创建一个名为 myownbucket1 的新存储桶(如果已经有一个名为 myownbucket 的存储桶)。谢谢

Answer 1

要通过 cloudformation 在 AWS 资源管理中创建或更新现有存储桶，您需要在 cfn.yaml/json 中拥有自定义资源。

  S3Checking:
    Type: 'Custom::CheckS3Bucket'
    Properties:
      ServiceToken: !GetAtt CustomResourceS3Function.Arn
      Bucket: !Ref NotifyBucket

CustomResourceS3Function 看起来像这样

 CustomResourceLambdaFunction:
    Type: 'AWS::Lambda::Function'
    Properties:
      Handler: index.lambda_handler
      Role: !GetAtt LambdaIAMRole.Arn
      Code:
        ZipFile: |
            from __future__ import print_function
            import json
            import boto3
            import cfnresponse

            SUCCESS = "SUCCESS"
            FAILED = "FAILED"

            print('Loading function')
            s3 = boto3.resource('s3')

            def lambda_handler(event, context):
                print("Received event: " + json.dumps(event, indent=2))
                responseData={}
                try:
                      print("Request Type:",event['RequestType'])
                      bucket_name=event['ResourceProperties']['Bucket']
                      bucket=event['ResourceProperties']['Bucket']
                      update_delete_buckets(bucket_name)
                      responseData={'Bucket':Bucket}
                      print("Sending response to custom resource")
                    responseStatus = 'SUCCESS'
                except Exception as e:
                    print('Failed to process:', e)
                    responseStatus = 'FAILED'
                    responseData = {'Failure': 'Something bad happened.'}
                cfnresponse.send(event, context, responseStatus, responseData)

            def update_delete_buckets(bucket):
                bucket_obj = s3.Bucket(bucket)
                if bucket_obj.creation_date:
                  print("The bucket exists")
                else:
                   print("The bucket does not exist")
                   s3.create_bucket(Bucket=bucket)

      Runtime: python3.9
      Timeout: 50