Data Analysis & Reporting Flashcards

Which open-source tool is commonly used to collect per-container resource metrics and expose them to Prometheus in a Docker environment?

Answer: cAdvisor

cAdvisor (Container Advisor) collects per-container CPU, memory, and network metrics and exposes a Prometheus endpoint.

You run `docker logs --since 2h api`. What does this output?

Answer: Logs generated in the past 2 hours of wall-clock time

`--since 2h` filters logs to those produced within the last 2 hours of real (wall-clock) time.

Which `docker events` filter would show only container die events?

Answer: --filter type=container --filter event=die

Combining `--filter type=container` and `--filter event=die` precisely targets container die events.

What does the `PIDS` column in `docker stats` output represent?

Answer: Number of processes or threads running inside the container

The `PIDS` column shows how many processes or threads are currently running inside that container.

When configuring the `awslogs` log driver, which option specifies the CloudWatch log group name?

Answer: awslogs-group

The `awslogs-group` option sets the CloudWatch Logs group where container logs are sent.

You need to extract the container's IP address from `docker inspect` output using a Go template. Which template expression is correct?

Answer: {{.NetworkSettings.IPAddress}}

The IP address lives at `{{.NetworkSettings.IPAddress}}` in the inspect JSON structure.

Which `docker system df` flag shows a detailed breakdown per image, container, and volume?

Answer: -v

`docker system df -v` adds a verbose per-item breakdown instead of aggregated totals.