Containerization and Role in CI CD

Question 1

What is a container?

Answer 1

Containers allow any application to be stored in a self-contained environment called a container. The container runs on top of an operating system which is shared among multiple containers, making the environment very efficient.

Question 2

Can multiple apps run on one operating system?

Answer 2

Yes.

Question 3

Are containers virtual machines?

Answer 3

No! There is a clear distinction: a virtual
machines give a separate operating
system to each application whereas
multiple containers can share an
operating system

Question 4

Containers in CI CD

Answer 4

Containers are used in the local environment so different developers all have access to the same environment. Containers are also used to deploy production apps.

Question 5

What is a Docker image?

Answer 5

A Docker image is a static, read-only template that contains a set of instructions for creating a Docker container.

It provides the environment setup, software, libraries, and dependencies that will be installed in the container.

Question 6

How are Docker Images built?

Answer 6

Images are built from a Dockerfile,
which is a script composed of various
commands and arguments that define
the operating system, libraries,
environment variables, and files.

Question 7

Where are Docker Images stored?

Answer 7

Images are often stored and shared through Docker Hub or other container registries, allowing them to be reused by others.

Question 8

What is a Docker Container?