DCA Practice Questions

The following Docker Compose file is deployed as a stack:

Is this statement correct about this health check definition?

Solution: Health checks test for app health five seconds apart. If the test fails, the container will be restarted three times before it gets rescheduled.

Is this an advantage of multi-stage builds?

Solution.better logical separation of Dockerfile instructions for increased readability

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.

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 controller managing the pod is autoscaled back to delete the unhealthy pod and alleviate load.

Are these conditions sufficient for Kubernetes to dynamically provision a persistentVolume, assuming there are no limitations on the amount and type of available external storage?

Solution: A volume is defined in a pod specification with the key persistentVolume: default.

In Docker Trusted Registry, is this how a user can prevent an image, such as 'nginx:latest’, from being overwritten by another user with push access to the repository?

Solution: Use the DTR web Ul to make all tags in the repository immutable.

Will this command ensure that overlay traffic between service tasks is encrypted?

Solution: docker network create -d overlay -o encrypted=true

Is this a Linux kernel namespace that is disabled by default and must be enabled at Docker engine runtime to be used?

Solution.pid

Is this a type of Linux kernel namespace that provides container isolation?

Solution: Authentication

Will This command list all nodes in a swarm cluster from the command line?

Solution. ‘docker swarm nodes'