AWS - Lambda
You want to create a Lambda function that processes images uploaded to an S3 bucket. Which combination of settings is required to ensure the Lambda runs automatically when a new image is uploaded?
You want to create a Lambda function that processes images uploaded to an S3 bucket. Which combination of settings is required to ensure the Lambda runs automatically when a new image is uploaded?
hard📝 Best Practice Q15 of 15
Step-by-Step Solution
Solution:
Step 1: Configure S3 event trigger
To run Lambda automatically on uploads, configure S3 to trigger Lambda on 'ObjectCreated' events.Step 2: Assign correct IAM role permissions
Lambda needs an execution role with permissions to read from S3 to process images.Final Answer:
Set S3 event trigger on bucket for 'ObjectCreated' and assign Lambda execution role with S3 read permissions -> Option CQuick Check:
S3 trigger + IAM role = automatic Lambda run [OK]
Quick Trick: Use S3 event triggers with proper IAM role [OK]
Common Mistakes:
- Thinking manual invocation is automatic
- Confusing runtime with event triggers
- Using EC2 unnecessarily for Lambda triggers
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