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Troubleshooting AWS Lambda Function Behavior
In this lab, you will troubleshoot and remediate failures in an AWS Lambda–based media processing workflow. Using CloudWatch Logs, Lambda metrics, IAM policies, and service configuration settings, you will identify the root causes of failed processing events and implement the required fixes to restore successful end-to-end workflow execution.
Lab Info
Table of Contents
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Challenge
Identify Lambda pipeline execution failures
- Trigger the image processing workflow using a test image upload
- Validate that uploaded images are not being processed successfully
- Identify the absence of expected Lambda invocation activity
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Challenge
Diagnose and remediate event handling issues
- Diagnose S3 bucket notification filters preventing event delivery
- Remediate incorrect prefix rules in the event source
- Validate restored event routing to initiate function execution
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Challenge
Diagnose and remediate IAM permission failures
- Diagnose AccessDenied errors using CloudWatch Logs
- Remediate missing S3 and DynamoDB permissions in the execution role
- Validate that IAM policies allow interaction with pipeline resources
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Challenge
Diagnose and remediate runtime and configuration failures
- Diagnose application exceptions caused by missing environment variables
- Remediate function timeouts by adjusting the duration limits
- Validate that runtime configuration allows successful function completion
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Challenge
Inspect failure handling
- Inspect dead-letter queue (DLQ) messages from historical failures
- Remediate CloudWatch Alarm thresholds monitoring the failure path
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