Which of following statements is true about the architecture of Docker?

The docker command executes REST API calls.

The architecture is client-server.

Docker containers are run as root.

The daemon must be run as root.

What is the general rule regarding running the Secure Shell (SSH) daemon inside a container.

It is not recommended because a container should ideally run a single process.

You can run SSH, but never allow sessions using the root user.

It is the recommended way to gain access to the terminal of a running container.

What options are available for getting source code into Docker Containers?

Create a custom docker image with the source code or create a data volume pointing to your dev machine.

Use the Dockerfile "EMBEDCODE" instruction.

Create a custom container with the source code and use the "mount" command to point to your dev machine.

You've been tasked with authoring a Dockerfile image which will encapsulate numerous networking tools which will be used to troubleshoot communication between containers. Which Dockerfile instruction(s) is, or are, best suited for defining what a derived container will execute?

The CMD instruction, because the image is multi-purpose in nature.

The ENTRYPOINT instruction, because the CMD instruction requires the presence of /bin/bash, whereas the ENTRYPOINT instruction does not.

A combination of the CMD and ENTRYPOINT instructions, because it's always necessary to provide a default execution parameter.

What's the good analogy for docker exec ?

Allows you to run additional processes in a container.

Allows you to run additional processes outside a container.

It's similar to installing software.

Allows you to run additional processes in new containers.

What syntax can be used to convert a Dockerfile into an Image?

docker build -t <image_name>:<tag_name> .

docker create -t <image_name>:<tag_name> .

docker run -t <image_name>:<tag_name> .

docker convert -t <image_name>:<tag_name> .

What is the major advantage of the ADD instruction over the COPY instruction?

The ADD instruction has remote URL support.

The ADD instruction creates fewer layers than COPY .

The COPY instruction is depricated.

The COPY instruction has remote URL support.

What happens if multiple ENTRYPOINT instructions are specified in one, single-stage Dockerfile?

Only the last ENTRYPOINT instruction has any effect.

Only the first ENTRYPOINT instruction has any effect.

All ENTRYPOINT instructions are processed in order and all have an effect on the container.

You use the EXPOSE instruction in the Dockerfile to set up containers to receive network traffic. Does that automatically publish container ports on the host?

No, you must explicitly publish ports to the host when you run a container.

By default, the host machine will listen on all incoming ports.

Yes, all ports in the EXPOSE instruction are automatically published.

Only standard ports 80 and 443 are automatically published.

What is the function of the CMD instruction if the ENTRYPOINT instruction is also used?

CMD instructions get interpreted as arguments to ENTRYPOINT .

CMD instructions override ENTRYPOINT instructions.

CMD instructions are used to create the environment in which ENTRYPOINT instructions run.

Where are created, modified, and deleted files stored in a container?

In the top most layer from the image it was created from.

In a volume mounted in the container

In the bottom most layer from the image it was created from.

Which of the following correctly describes a Docker container?

An instance of an application created from a Docker image.

A text file describing the dependencies of an application.

An online registry of Docker images.

A package consisting of an application and all its dependencies.

You use EXPOSE instructions in Dockerfile to document which ports need mapping for your containerized applications to work. How can you launch containers from these images and automatically map exposed ports?

Use the docker run command with the -P flag

Use the docker run command with the -expose-all runtime flag.

Use the docker run command with the -map-all flag.

Use the docker run command with the --port runtime flag.

Which Docker CLI commands can be used in a sequence to create a Docker image?

docker container run , and docker container commit .

docker container run , and docker image commit .

docker container ls , and docker image commit .

docker container diff , and docker container commit .

Which of the following commands will successfully build an image with the name "myimage"?

docker build --tag-image myimage

Which of the following best describes a Docker Image?

A read-only template for starting one or more containers.

A data volume that can be mounted inside of a container.

A point-to-time snapshot of a container used for backups.

A read-write template for starting one or more containers.

What is a dangling image?

An image that's not associated with a tag.

An intermediate part of the chain of image layer.

An image that's not associated with a volume.

An image that's not associated with a running container.

Which of the following explains the relationship between a Docker image and Docker container?

A Docker container is a running instance of an image.

A Docker container is used to start a Docker image.

A Docker container is a collection of image layers.

A docker container is two or more images that share a common execution environment.

What is the purpose of an image?

To provide the filesystem for an application.

To provide a traditional process for an application.

To provide the network configuration for an application's network stack.

To provide an isolated process for an application.

Getting Started with Docker and Dockerfile

Authored by Khachatur Ashotyan

Professional Development, Computers, Specialty

Professional Development

Used 11+ times

Getting Started with Docker and Dockerfile

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MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Key benefits of Docker for web developers includes:

Consistency between envionments.

Simplify working with multiple framework versions.

Setup a development environment quickly.

All of these.

Ship code faster.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which of following statements is untrue about Docker.

By default, Docker doesn't create containers in user namespaces because not all Linux distributions enable user namespace sin their kernel.

User namespaces allow a container's process to be privileged in its own user namespace, whilst remaining non-privileged in the host's user namespace.

Docker creates a sub-directory in its data root so that newly created objects are owned by the UID/GID at the top of the docker-remap user's subordinate ranges.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which of the following statements regarding the ephemerality of containers is FALSE?

Containerized applications tend to be easier to scale.

Containers starts ridiculously fast.

Containers require IT Ops to build individual instances.

Containers can be packaged and instantiated directly from developer IDEs.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

How does the dockerd expose the Docker API?

gRPC on a Unix socket.

As a versioned HTTP(S) REST interface.

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

What key concepts does Docker rely on?

Images and containers

Images and virtual machines

Images and archives

Virtual machines and LXC

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Docker containers can be started and stopped.

True

False

MULTIPLE CHOICE QUESTION

45 sec • 1 pt

Which component of the Docker implements the Docker API.

The Docker daemon.

The Docker client.

containerd

The OCI layer.

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Getting Started with Docker and Dockerfile

Key benefits of Docker for web developers includes:

Which of following statements is untrue about Docker.

Which of the following statements regarding the ephemerality of containers is FALSE?

How does the dockerd expose the Docker API?

What key concepts does Docker rely on?

Docker containers can be started and stopped.

Which component of the Docker implements the Docker API.

What is the atomic unit of scheduling in Docker.

Which component of the Docker interfaces with the kernel primitives that are used to build containers?

Which of following statements is true about the architecture of Docker?

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