Cribl Cribl Monitoring & Troubleshooting 2 — Questions and Answers
Question 1: Which Cribl feature enables you to replay events stored in a Persistent Queue after a destination outage is resolved?
- The 'Replay' action on the Persistent Queue in the destination settings (Correct answer)
- The Pipeline Profiler replay button
- The Live Data Capture buffer
- The Event Breaker reset function
Correct answer: The 'Replay' action on the Persistent Queue in the destination settings
Cribl's Persistent Queue includes a Replay action that allows operators to resend queued events to the destination once connectivity is restored.
Question 2: How does the Cribl Pipeline Profiler help with performance troubleshooting?
- It shows the processing time and event count for each function in the pipeline (Correct answer)
- It replays events from the persistent queue
- It generates a schema for incoming events
- It rotates TLS certificates automatically
Correct answer: It shows the processing time and event count for each function in the pipeline
The Pipeline Profiler breaks down per-function processing time and event counts, helping identify bottlenecks within the pipeline.
Question 3: When troubleshooting a Cribl Source that is not receiving events, which diagnostic step should be performed first?
- Verify network connectivity and firewall rules between the source host and the Cribl input port (Correct answer)
- Restart the entire Cribl deployment
- Delete and recreate the pipeline
- Increase the Worker Group node count
Correct answer: Verify network connectivity and firewall rules between the source host and the Cribl input port
Network connectivity and firewall verification is the first step because no data can reach Cribl if the port is blocked or the source cannot reach the input address.
Question 4: What does a high 'Parse Failure' rate on a Cribl Source typically indicate?
- The Event Breaker rules do not match the incoming data format (Correct answer)
- The destination is unavailable
- The Worker node is out of memory
- The TLS certificate has expired
Correct answer: The Event Breaker rules do not match the incoming data format
High parse failure rates indicate that the configured Event Breaker pattern does not match the format of incoming events, causing parsing errors.
Question 5: Which command-line tool included with Cribl can be used to test connectivity from a Worker node to a downstream destination?
- cribl test-connection or standard network tools like curl/nc from the Worker host (Correct answer)
- The Cribl UI deployment wizard
- The Pipeline Profiler CLI
- The Persistent Queue replay command
Correct answer: cribl test-connection or standard network tools like curl/nc from the Worker host
Standard network tools such as curl or netcat (nc) run from the Worker host are used to verify TCP/HTTP connectivity to downstream destinations.
Question 6: In Cribl, what does the 'Throttle' function do when added to a pipeline during troubleshooting?
- It limits the event throughput rate to reduce load on downstream systems (Correct answer)
- It drops all events matching a condition
- It buffers events in memory indefinitely
- It re-routes events to a debug destination
Correct answer: It limits the event throughput rate to reduce load on downstream systems
The Throttle function caps the rate of events passing through the pipeline, useful for temporarily reducing load on struggling downstream destinations.
Cribl Cribl Monitoring & Troubleshooting 2
Which Cribl feature enables you to replay events stored in a Persistent Queue after a destination outage is resolved?