DCA Practice Test

What is one way of directly transferring a Docker Image from one Docker host in another?

A.

'docker push' the image to the IP address of the target host.

B.

'docker commit' to save the image outside of the Docker filesystem. Then transfer the file over to the
target host and 'docker start' to start the container again.

C.

There is no way of directly transferring Docker images between hosts. A Docker Registry must be used
ad an intermediary.

D.

'docker save' the image to save it as TAR file and copy it over to the target host. Then use 'docker load'
to un-TAR the image back as a Docker image.

Which of the following is NOT backed up when performing a Docker Trusted backup operation?

A.

Access control to repos and images

B.

Repository metadata

C.

Image blobs

D.

DTR configurations

A server is running low on disk space. What command can be used to check the disk usage of images,
containers, and volumes for Docker engine?

A.

'docker system df'

B.

'docker system prune'

C.

'docker system free'

D.

'docker system ps'

A user is having problems running Docker. Which of the following will start Docker in debug mode?

A.

Set the debug key to true in the 'daemon.json' file.

B.

Start the 'dockerd' process manually with the '--logging' flag set to debug

C.

Set the logging key to debug in the 'daemon.json' file.

D.

Start the 'dockerd' process manually with the '--raw-logs' flag set to debug

What is the difference between a resource limit and a resource reservation when scheduling services?

A.

A resource limit and a resource reservation can be used interchangeably.

B.

A resource limit is a soft limit for your service, while a reservation is hard limit and the docker engine
will do its best to keep your service at the limit.

C.

A resource limit is used to find a host with adequate resources for scheduling a hard limit for your
service, while a reservation is hard limit for your service.

D.

A resource limit is hard limit for your service, while a reservation is used to find a host with adequate resources for scheduling. Correct