Contenido perteneciente al curso Docker avanzado.

Which of the following commands will automatically create a volume when a container is started?

• A. docker container run –name nginxtest –volumes=/app nginx
• B. docker container run –name nginxtest -v /app:mount nginx
• C. docker container run –name nginxtest –volumes myvol:/app:new nginx
• D. docker container run –name nginxtest -v myvol:/app nginx (Correcta)

Which one of the following commands will show a list of volumes for a specific container?

• A. docker container logs nginx –volumes
• B. docker container inspect nginx (Correcta)
• C. docker volume inspect nginx
• D. docker volume logs nginx –containers

Which one of the following commands will result in the volume being removed automatically once the container has exited?

• A. docker run –del -v /foo busybox
• B. docker run –read-only -v /foo busybox
• C. docker run –rm -v /foo busybox
• D. docker run –remove -v /foo busybox

No hay ninguna opción correcta ya que en todos los casos es incorrecta la sintaxis de los volúmenes.

A container named “analytics” that stores results in a volume called “data” was created (docker run -d --name=analytics -v data:/data app1). How are the results accessed in “data” with another container called “app2”?

• A. docker run -d –name=reports –volume=data app2
• B. docker run -d –name=reports –volumes-from=analytics app2 (Correcta)
• C. docker run -d –name=reports –volume=app1 app2
• D. docker run -d –name=reports –mount=app1 app2

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 (Correcta)
• B. docker system prune
• C. docker system free
• D. docker system ps

Which of the following are types of namespaces used by Docker to provide isolation? (Choose 2.)

• A. Host
• B. Network (Correcta)
• C. Process ID (Correcta)
• D. Authentication
• E. Storage

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. (Correcta)

Which of the following namespaces is disabled by default and must be enabled at Docker engine runtime in order to be used?

• A. user (Correcta)
• B. pid
• C. net
• D. mnt

Which of the following statements is true about secrets?

• A. Secrets can be created from any node in the cluster.
• B. Secrets can be modified after they are created.
• C. Secrets are stored unencrypted on manager nodes.
• D. Secrets can be created using standard input (STDIN) and a file. (Correcta)

Following the principle of least privilege, which of the following methods can be used to securely grant access to the specific user to communicate to a Docker engine? (Choose two.)

• A. Utilize the --host 0.0.0.0:2375 option to the Docker daemon to listen on port 2375 over TCP on all interfaces
• B. Utilize openssl to create TLS client and server certificates, configuring the Docker engine to use with mutual TLS over TCP. (Correcta)
• C. Utilize the --host 127.0.0.1:2375 option to the Docker daemon to listen on port 2375 over TCP on localhost
• D. Give the user root access to the server to allow them to run Docker commands as root.
• E. Add the user to the 'docker' group on the server or specify the grouè with the '–group' Docker daemon option. (Correcta)