Module 1

Question 1

Container

Answer 1

A container is an executable unit of software in which application code is packaged, along with its libraries and dependencies, in common ways so that it can be run anywhere, whether on a desktop, on-premises, or in the cloud.

Question 2

Benefits of containers

Answer 2

• Lightweight
• Portable and platform independent
• Support modern development and architecture
• Improve utilization

Question 3

Docker

Answer 3

Docker is an open-source community that develops container technologies. It is a company that provides enterprise software.

Question 4

Dockerfile

Answer 4

•Text file that contains all the commands a user would call on the command line to create the image. •Blueprint from which an image is built. •Outlines all the steps to be taken to build the desired image; Docker then builds that image.

Question 5

Image

Answer 5

• Immutable file that contains the source code, libraries, and dependencies that are necessary for an application to run.
• That immutability means that images are read-only; if users change an image, a new image is created.
• In a sense, images are templates or blueprints for a container. Users can also think of images as snapshots of a container. A container is therefore a running image. Since images are read-only, a write layer is placed on top of images to enable the container to execute.

Question 6

What is a container registry?

Answer 6

A container registry is used for the storage and distribution of named container images. They can be public or private and hosted or self-hosted.

Question 7

When storing an image in a registry, users___the image to the registry.

Answer 7

push

Question 8

When retrieving an image from a registry, users___the image

Answer 8

“pull”

Question 9

The image name usually consists of three parts

Answer 9

hostname/repository:tag

Question 10

Which is abenefitof containers?

Answer 10

They supply portabilitybetween different platforms and clouds.

Question 11

What is one of the reasons that containers are considered a better option than virtual machines?

Answer 11

C.Containers are small and do not consume as many resources.

Question 12

Which of the following defines a read-only file that holds code, libraries, and dependencies required by an application to run?

Answer 12

A container image

Question 13

Which of the following is true regarding containers?

Answer 13

Containers do not require a guest operating system.

Question 14

What are the operating system primitives that enable virtualization in the Linux Kernel?

Answer 14

namespacesand cgroups

Question 15

Physical hardware is traditionally virtualized by which of the following?

Answer 15

Hypervisors

Question 16

Which of the following is a platform used for container orchestration?

Answer 16

Kubernetes

Question 17

What is an important difference between containers and virtual machines?

Answer 17

Containers virtualize the operating system and VMs virtualize the hardware.

Question 18

What is a Dockerfile?

Answer 18

A text file that contains the instructions needed to create a new container image.

Question 19

Which of the following isconsideredimmutable?

Answer 19

Image