Docker Review

Question 1

What is containerization?

Answer 1

• mechanism for packaging an application with dependencies– runs in its own isolated environment
• ensures app or processes can run reliably regardless of the host environment

Question 2

What is a Docker image?

Answer 2

• blueprint of everything container needs to run

- like a snapshot

Question 3

What is a Docker Container?

Answer 3

Docker Container is a standardized unit that can be created on the fly to deploy a particular application or environment.

• built from images
• stateless, scalable, portable
• secure, lightweight
• loosely coupled

Question 4

what is docker-compose?

Answer 4

• tool that makes creating and managing multi-container apps easier
• includes key info. (environment variables, ports, volumes)

Question 5

what are docker volumes?

Answer 5

• files that exist on the host file system outside of container
• a way to persist data & share data between containers

Question 6

What is the benefit to an image being built in Layers?

Answer 6

• when building an image, it will reuse layers if files have been unchanged
• reduces build time

Question 7

What is a container registry?

Answer 7

a repository: used to store and access container images

Question 8

How to save a Docker container state?

Answer 8

a docker commit