Scenario 11: “S3 Bucket Cross-Region Replication Issue”
Cross-region replication for an S3 bucket is not working as expected.
Possible Solutions:
Confirm IAM roles: Ensure that the IAM roles used for cross-region replication have appropriate permissions on both source and destination buckets.
Verify bucket names: Check that the bucket names and configurations in the replication rules are accurate and match the intended setup.
Check AWS Region Support: Ensure that the source and destination AWS Regions support cross-region replication.
Scenario 12: “CloudFront Distribution Misconfiguration”
Your CloudFront distribution is not serving content as expected.
Possible Solutions:
Check origin settings: Verify that the origin (e.g., S3 bucket, EC2 instance) associated with the CloudFront distribution is correctly configured.
Confirm Cache Behavior settings: Review the Cache Behavior settings to ensure proper cache control headers and caching behaviors.
Check distribution status: Ensure that the CloudFront distribution is in the “Deployed” state and has propagated changes globally.
Scenario 13: “RDS Multi-AZ Failover”
Your RDS Multi-AZ deployment is experiencing a failover event.
Possible Solutions:
Check RDS instance health: Investigate the underlying cause of the primary instance’s failure, such as storage issues or instance health.
Monitor failover duration: Monitor the failover process and check if the secondary instance becomes the new primary.
Review RDS event logs: Examine RDS event logs to understand the details of the failover event.
Scenario 14: “ECS Task Stuck in Pending State”
Your ECS task is stuck in the “PENDING” state and not launching.
Possible Solutions:
Review task definition: Verify that the task definition is valid and does not have any syntax errors or missing configurations.
Check resource availability: Ensure that there are sufficient resources (CPU, memory) available in the ECS cluster to accommodate the task.
Verify IAM roles and permissions: Confirm that the IAM roles associated with the ECS task have the necessary permissions to access other AWS services.
Scenario 15: “API Gateway 500 Internal Server Error”
Your API Gateway endpoint is returning a “500 Internal Server Error.”
Possible Solutions:
Check Lambda function logs: Investigate the Lambda function that is integrated with the API Gateway and review its logs for error messages.
Validate API Gateway settings: Confirm that the API Gateway configuration, including request and response mappings, is set up correctly.
Monitor backend resources: Ensure that the backend resources (e.g., DynamoDB, RDS) used by the Lambda function are available and responsive.
Scenario 16: “CloudWatch Alarm Not Triggering”
Your CloudWatch alarm is not triggering as expected.
Possible Solutions:
Check metric threshold: Review the alarm configuration and verify that the metric threshold is set appropriately to trigger the alarm.
Confirm metric period and evaluation period: Ensure that the metric period and evaluation period are aligned with your monitoring requirements.
Validate IAM permissions: Confirm that the IAM roles used for CloudWatch alarms have the necessary permissions to take the specified action.
Scenario 17: “EBS Volume Detachment Failure”
You are unable to detach an EBS volume from an EC2 instance.
Possible Solutions:
Check instance state: Verify that the EC2 instance is in a “stopped” state before attempting to detach the EBS volume.
Review EC2 instance events: Look for any events related to the EBS volume that might be preventing detachment.
Check volume status: Ensure that the EBS volume is in an “available” state, as you cannot detach a volume if it is in use.
Scenario 18: “Lambda Function Invocation Errors”
Your Lambda function is experiencing invocation errors.
Possible Solutions:
Check function concurrency: Confirm that the Lambda function is not hitting any concurrency limits, and if necessary, adjust the concurrency settings.
Review function permissions: Ensure that the IAM roles associated with the Lambda function have the necessary permissions to access resources.
Monitor function timeout: Monitor the function’s timeout and increase it if the function is reaching the maximum execution time.
Scenario 19: “VPC Peering Connection Issue”
You are unable to establish a VPC peering connection between two VPCs.
Possible Solutions:
Confirm VPC CIDR ranges: Ensure that there is no overlap between the CIDR ranges of the peering VPCs.
Check route tables: Verify that the route tables in both VPCs are correctly configured to route traffic between the peering connections.
Review VPC peering connection status: Check the VPC peering connection status in both VPCs to identify any errors or issues.
Scenario 20: “SNS Topic Subscription Error”
You are unable to subscribe an endpoint to an SNS topic.
Possible Solutions:
Verify endpoint permissions: Ensure that the endpoint (e.g., email address, HTTP/S endpoint) has the necessary permissions to receive messages from the SNS topic.
Check subscription confirmation: If the endpoint requires confirmation (e.g., email subscription), check for confirmation emails or messages and follow the confirmation process.
Review SNS topic policies: Confirm that the SNS topic has appropriate policies that allow the necessary subscriptions.
Acquiring troubleshooting skills in the cloud positively impacts an individual’s personal growth by fostering adaptability, problem-solving abilities, and self-confidence, leading to enhanced professional competence and career advancement.