Online Access Free Docker.DCA.v2022-05-03.q65 Practice Test (Page 6)

DCA Exam Question 21

Which statement is true about DTR garbage collection?

A.Garbage collection removes unused volumes from cluster nodes

B.Garbage collection removes exited containers from cluster nodes.

C.Garbage collection removes DTR images that are older than a configurable of days

D.Garbage collection removes unreferenced image layers from DTR's backend storage.

DCA Exam Question 22

A docker service 'web' is running with a scale factor of 1 (replicas = 1).
Bob intends to use the command 'docker service update --replicas=3 web'.
Alice intends to use the command 'docker service scale web=3'.
How do the outcomes oft these two commands differ?

A.Bob's command updates the number of replicas of the 'web' service to 3. Alice's command results in an error.

B.Bob's command only updates the service definition, but no new replicas are started. Alice's command results in the actual scaling up of the 'web' service.

C.Both Bob's and Alice's commands result in exactly the same outcome, which is 3 instances of the 'web' service.

D.Bob's command results in an error. Alice's command updates the number of replicas of the 'web' service to 3.

DCA Exam Question 23

You created a new service named 'http' and discover it is not registering as healthy. Will this command enable you to view the list of historical tasks for this service?
Solution: 'docker service inspect http'

A.Yes

B.No

DCA Exam Question 24

You are running only Kubernetes workloads on a worker node that requires maintenance, such as installing patches or an OS upgrade
Which command must be run on the node to gracefully terminate all pods on the node, while marking the node as unschedulable?

A.'kubectl cordon <node name>'

B.'docker swarm leave'

C.'docker node update --availability drain <node name>'

D.'kubectl drain <node name>'

DCA Exam Question 25

A persistentVolumeClaim (PVC) is created with the specification storageClass: "", and size requirements that cannot be satisfied by any existing persistentVolume.
Is this an action Kubernetes takes in this situation?
Solution: The PVC remains unbound until a persistentVolume that matches all requirements of the PVC becomes available.