DCA Data Analysis & Reporting 2

Question 1

Which command shows real-time resource usage statistics for all running containers?

Accepted Answer

docker stats

Answer

`docker stats` streams live CPU, memory, network I/O, and block I/O metrics for running containers.

Question 2

You want to capture a single snapshot of container stats without streaming continuously. Which flag achieves this?

Accepted Answer

--no-stream

Answer

`docker stats --no-stream` outputs one set of stats and exits instead of continuously streaming.

Question 3

Which `docker system` subcommand displays disk usage broken down by images, containers, and volumes?

Accepted Answer

docker system df

Answer

`docker system df` reports disk usage for images, containers, local volumes, and build cache.

Question 4

A developer needs to retrieve the last 50 log lines from a container named `api`. Which command is correct?

Accepted Answer

docker logs --tail=50 api

Answer

`docker logs --tail=50 api` outputs only the last 50 lines from the container's log.

Question 5

Which log driver sends container logs directly to a syslog server?

Accepted Answer

syslog

Answer

The `syslog` log driver forwards container log messages to a syslog-compatible server.

DCA - Docker Certified Associate Exam Practice Test