A process is slow. What would you inspect first?
Clarify whether the delay is new, which requests are affected, and whether the process is using CPU or waiting on something else. Compare process activity with dependency latency and the incident timeline. High load alone does not prove that more CPU will solve the problem.
For our example, a report job slows an API only during business hours. Compare report volume, concurrent requests, and resource contention. State what observation would distinguish expensive computation from storage waiting or an overloaded database.
How can a write fail when a directory looks small?
Inspect the filesystem that actually contains the destination, available space, inode availability, and the process's permissions. A directory listing does not describe every consumer of that filesystem. Also consider an open deleted file still held by a running process.
Imagine a log writer failing after a large deployment. First identify its destination and the filesystem boundary. Do not remove arbitrary files to create space. Explain how you would locate the relevant usage, preserve necessary evidence, and verify that the application can write again.
Why might a file permission change not fix access?
Access depends on the process identity and the path leading to the file, as well as the file's permissions. Directory traversal and deployment ownership can matter. Establish the effective user and the actual path before deciding what permission needs changing.
Our sample service reads a configuration file through a directory accessible only to its owner. Changing the file's read bit alone leaves the directory boundary intact. Explain the narrow intended access and avoid treating world-writable permissions as a general repair.
How would you debug an unreachable service?
Trace name resolution, destination address, listening socket, network path, and application response. A process can be running without listening on the expected interface. A successful request from the server itself may not establish reachability from a remote client.
State where each test originates. If localhost succeeds but a remote connection fails, investigate the listener binding and network controls before rewriting application logic. Keep request timeouts distinct from connection failures and explain which evidence narrows the next step.
Practice exercise
Rehearse a service that returns errors after a deployment. You learn that reads work, writes fail, and CPU is normal. List three competing causes, the smallest read-only observation for each, and the correction each result would justify.
Finish with a recovery check from the affected user's path. Record the cause, the verified repair, and a monitoring signal that would catch recurrence. A list of commands is less useful than a sequence that explains why each command is needed.
Rehearse this answer with Cluegent
Give Cluegent the symptoms one at a time and ask it to act as a mock interviewer. State your hypothesis before requesting another clue, then revise it when the evidence changes.
Try Cluegent for your practice session, then repeat the explanation without suggestions. Judge your answer by its accuracy, evidence, and response to follow-up questions.
Sources checked
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Where Cluegent helps
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Frequently asked questions
How should I practise this topic?
Rehearse a service that returns errors after a deployment. You learn that reads work, writes fail, and CPU is normal. List three competing causes, the smallest read-only observation for each, and the correction each result would justify.
How can Cluegent help with preparation?
Give Cluegent the symptoms one at a time and ask it to act as a mock interviewer. State your hypothesis before requesting another clue, then revise it when the evidence changes.