A production container is writing logs to stdout, but the logs are not appearing in docker logs. The container was started with: docker run -d --log-driver journald myapp. The administrator checks journalctl and finds the logs there. What is the most likely reason docker logs shows nothing?

The application writes to stderr instead of stdout.

The journald logging driver does not write to the container's local log files, so docker logs cannot retrieve them.

The container is not running, so docker logs cannot retrieve logs.

The --log-driver flag is not supported by the Docker daemon.

LPIC-3 Virtualization and Containerization

Domain 2Objective 3

352.3 Docker (weight: 9) LPIC-3-VIRTUALIZATION Practice Questions (Page 4)

Part of the Topic 352: Container Virtualization domain, which makes up ~32% of our current practice bank. Linux Professional Institute does not publish an official question count, but from its 90-minute exam (~35–60 total, ~11–19 in this domain), expect 3–5 from this objective — we provide 24 practice questions to prepare you well beyond it. (estimate)

24questions here

5free pages

9concepts

Questions 16–20

16foundation · easy
In the Docker client-server architecture, which component is responsible for managing containers, images, and networks on a host?
Select an answer first
17expert · hard
A production container is writing logs to stdout, but the logs are not appearing in docker logs. The container was started with: docker run -d --log-driver journald myapp. The administrator checks journalctl and finds the logs there. What is the most likely reason docker logs shows nothing?
Select an answer first
18foundation · easy
Which Docker network type provides the most isolation by giving each container its own network namespace and a virtual interface?
Select an answer first
19foundation · easy
Which command creates a new custom Docker network?
Select an answer first
20application · easy
A DevOps engineer needs to troubleshoot why a containerized application is failing to start. The container exits immediately after launch. Which command provides the most direct view of the application's output to diagnose the issue?
Select an answer first

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352.3 Docker (weight: 9) LPIC-3-VIRTUALIZATION Practice Questions (Page 4)

Questions 16–20

In the Docker client-server architecture, which component is responsible for managing containers, images, and networks on a host?

A production container is writing logs to stdout, but the logs are not appearing in docker logs. The container was started with: docker run -d --log-driver journald myapp. The administrator checks journalctl and finds the logs there. What is the most likely reason docker logs shows nothing?

Which Docker network type provides the most isolation by giving each container its own network namespace and a virtual interface?

Which command creates a new custom Docker network?

A DevOps engineer needs to troubleshoot why a containerized application is failing to start. The container exits immediately after launch. Which command provides the most direct view of the application's output to diagnose the issue?

Keep studying — Topic 352: Container Virtualization