Docker Certified Associate Certification Training Course - Docker Images

The video tutorial explains Docker images, comparing them to pictures as templates frozen in time. It covers the concept of multi-layered storage in Docker images, where each layer is writable only when running. The tutorial discusses base images, how to create and modify Docker images, and the process of building images from scratch using Docker files. It emphasizes the importance of the base image as a starting point and the use of commands to build and tag images.

What is a Docker image compared to in the video?

• A moving picture

• A frozen template

• A dynamic webpage

• A live stream

What happens to a Docker image when it is run?

• It turns into a container

• It is deleted

• It is archived

• It becomes a static file

What is the role of the top layer in a Docker image?

• It is always read-only

• It is used for logging

• It is writable and can be modified

• It stores metadata

What is a base image in Docker?

• An image with no layers

• The initial image used to build other images

• An image that cannot be modified

• A temporary image

How can you create a Docker image from scratch?

• By using a GUI tool

• By copying an existing image

• By writing a Dockerfile with the 'FROM scratch' command

• By using a pre-built image

What command is used to specify a base image in a Dockerfile?

• ADD

• FROM

• RUN

• COPY

What is the purpose of tagging a Docker image?

• To delete the image

• To compress the image

• To create a backup

• To give the image an alias