DCA Data Analysis & Reporting 3

Question 1

You want to filter `docker events` to only show events for a specific container image. Which flag do you use?

Accepted Answer

--filter image=<name>

Answer

`docker events --filter image=<name>` restricts output to events involving that specific image.

Question 2

Which metric is NOT reported by `docker stats`?

Accepted Answer

Number of open file descriptors

Answer

`docker stats` reports CPU %, memory, network I/O, and block I/O but does not show open file descriptor counts.

Question 3

When using the `gelf` log driver, logs are sent to which type of endpoint?

Accepted Answer

A Graylog Extended Log Format UDP/TCP endpoint

Answer

The `gelf` driver sends logs in Graylog Extended Log Format to a Graylog or compatible GELF endpoint.

Question 4

A container's health check is reporting `unhealthy`. Which command gives you the detailed health check output history?

Accepted Answer

docker inspect <container>

Answer

`docker inspect` includes a `Health` field with the last five health check results and their output.

Question 5

What format does `docker inspect` use to output container metadata by default?

Accepted Answer

JSON

Answer

`docker inspect` outputs container metadata as a JSON array by default.

DCA - Docker Certified Associate Exam Practice Test