Docker DCA Actual Free Exam Questions & Community Discussion

Will this configuration achieve fault tolerance for managers in a swarm?
Solution: an odd number of manager nodes, totaling more than two

Seven managers are in a swarm cluster.
Is this how should they be distributed across three datacenters or availability zones?
Solution: 5-1-1

A company's security policy specifies that development and production containers must run on separate nodes in a given Swarm cluster. Can this be used to schedule containers to meet the security policy requirements?
Solution.label constraints

Is this the purpose of Docker Content Trust?
Solution: Verify and encrypt Docker registry TLS.

You want to create a container that is reachable from its host's network.
Does this action accomplish this?
Solution: Use network attach to access the container on the bridge network.

Will this action upgrade Docker Engine CE to Docker Engine EE?
Solution.Disable the Docker service via 'chkconfig' or 'systemctl'.

One of several containers in a pod is marked as unhealthy after failing its livenessProbe many times. Is this the action taken by the orchestrator to fix the unhealthy container?
Solution: The unhealthy container is restarted.

Does this command create a swarm service that only listens on port 53 using the UDP protocol?
Solution: 'docker service create --name dns-cache -p 53:53/udp dns-cache'

Two pods bear the same label, app: dev.
Will a label selector matching app: dev match both of these pods?

During development of an application meant to be orchestrated by Kubernetes, you want to mount the /data directory on your laptop into a container.
Will this strategy successfully accomplish this?
Solution: Create a PersistentVolume with storageciass: "" and hostPath: /data, and a persistentVolumeClaim requesting this PV. Then use that PVC to populate a volume in a pod

In Kubernetes, to mount external storage to a filesystem path in a container within a pod, you would use a volume in the pod specification. This volume is populated with a persistentVolumeClaim that is bound to an existing persistentVolume. The persistentVolume is defined and managed by the storageClass which provides dynamic or static provisioning of the volume and determines what type of storage will be provided1. Reference:
* Dynamic Volume Provisioning | Kubernetes
Is this a supported user authentication method for Universal Control Plane?
Solution: Docker ID

Will this command display a list of volumes for a specific container?
Solution: docker volume logs nginx --containers'