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Data Analysis & Reporting Flashcards

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  1. Which log driver is the default for Docker containers when no driver is explicitly configured?

    Answer: json-file

    By default, Docker uses the `json-file` log driver, storing logs as JSON on the host filesystem.

  2. You want `docker logs` to follow output in real time, similar to `tail -f`. Which flag do you use?

    Answer: --follow

    `docker logs --follow` (or `-f`) continuously streams new log output as the container produces it.

  3. A Swarm service is running 5 replicas. Which command retrieves aggregated logs from all replicas?

    Answer: docker service logs

    `docker service logs` aggregates log output from all replicas of a Swarm service.

  4. When the `json-file` log driver is configured with `max-size=10m` and `max-file=3`, what happens when logs exceed 10MB?

    Answer: The log file rotates and old files are deleted when count exceeds 3

    Docker rotates the log file at `max-size` and keeps only `max-file` rotated files, deleting the oldest.

  5. Which command would report the total number of images, containers, and volumes on a Docker host?

    Answer: docker info

    `docker info` provides a comprehensive summary including counts of images, containers, and volumes.

  6. You need to time-limit `docker events` to only show events that occurred in a specific window. Which flags accomplish this?

    Answer: --since and --until

    `docker events --since` and `--until` bound the time range of events returned.

  7. Which storage location on the host holds `json-file` log driver output for a container?

    Answer: /var/lib/docker/containers//-json.log

    The `json-file` driver writes logs to `/var/lib/docker/containers//-json.log` on the host.

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