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Exam AWS Certified DevOps Engineer - Professional DOP-C02 All Questions

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Exam AWS Certified DevOps Engineer - Professional DOP-C02 topic 1 question 302 discussion

Exam question from Amazon's AWS Certified DevOps Engineer - Professional DOP-C02
Question #: 302
Topic #: 1
[All AWS Certified DevOps Engineer - Professional DOP-C02 Questions]

A company configured an Amazon S3 event source for an AWS Lambda function. The company needs the Lambda function to run when a new object is created or an existing object is modified in a specific S3 bucket. The Lambda function will use the S3 bucket name and the S3 object key of the incoming event to read the contents of the new or modified S3 object. The Lambda function will parse the contents and save the parsed contents to an Amazon DynamoDB table.

The Lambda function's execution role has permissions to read from the S3 bucket and to write to the DynamoDB table. During testing, a DevOps engineer discovers that the Lambda function does not run when objects are added to the S3 bucket or when existing objects are modified.

Which solution will resolve these problems?

  • A. Create an S3 bucket policy for the S3 bucket that grants the S3 bucket permission to invoke the Lambda function.
  • B. Create a resource policy for the Lambda function to grant Amazon S3 permission to invoke the Lambda function on the S3 bucket.
  • C. Configure an Amazon Simple Queue Service (Amazon SQS) queue as an OnFailure destination for the Lambda function. Update the Lambda function to process messages from the SQS queue and the S3 event notifications.
  • D. Configure an Amazon Simple Queue Service (Amazon SQS) queue as the destination for the S3 bucket event notifications. Update the Lambda function's execution role to have permission to read from the SQS queue. Update the Lambda function to consume messages from the SQS queue.
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Suggested Answer: B 🗳️
by f4b18ba at Nov. 20, 2024, 5:10 p.m.
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f4b18ba
4 days, 9 hours ago
Selected Answer: A
Event Source Mapping and Permission Requirements: For Amazon S3 to invoke a Lambda function, the Lambda function must have a resource-based policy that grants Amazon S3 permission to invoke it. Without this resource-based policy, even if the event source is correctly configured, the Lambda function will not be triggered because S3 is not authorized to invoke it. Resource Policy for Lambda Function: A resource policy on the Lambda function explicitly allows Amazon S3 to invoke the function for the specified bucket events (e.g., object creation or modification). This resolves the issue by enabling S3 to trigger the Lambda function Action - lambda:InvokeFunction allows S3 to invoke the Lambda function. https://docs.aws.amazon.com/lambda/latest/dg/with-s3.html
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