Docker for the Absolute Beginner - Hands-On - Docker Storage - Demo

The video tutorial explores how Docker stores data, focusing on the default folder structure and the role of storage drivers in managing layers. It demonstrates how to build a Docker image from a Python Flask application, highlighting the caching mechanism that optimizes build times by reusing layers. The tutorial also covers how to analyze disk usage using Docker commands, providing insights into actual storage consumption versus reported image sizes.

What is the default directory where Docker stores its data?

• /usr/local/docker

• /opt/docker

• /var/lib/docker

• /etc/docker

Which storage driver is the default for Debian and Ubuntu systems?

• aufs

• btrfs

• overlay2

• zfs

In the AUFS storage driver, where are the actual contents of each layer stored?

• diff folder

• root folder

• layers folder

• mount folder

What command can you use to see the steps followed to create a Docker image?

• docker inspect

• docker build

• docker history

• docker logs

What is the first step in creating a Docker image from a Python Flask application?

• Install Python packages

• Copy source code

• Specify entry point

• Create image from Ubuntu

Why did the second Docker build of the Flask app complete quickly?

• The network speed was faster

• Fewer dependencies were installed

• The image was already built and cached

• The Dockerfile was optimized

What happens when a step in a Dockerfile changes?

• No steps are rebuilt

• Subsequent steps are rebuilt

• All steps are rebuilt from scratch

• Only the changed step is rebuilt

How does Docker handle layers when only the source code changes?

• Rebuilds all layers

• Reuses unchanged layers

• Deletes all layers

• Ignores the change

What command shows the actual disk usage of Docker images?

• docker volume ls

• docker images

• docker ps

• docker system df

What does the 'shared size' column indicate in the Docker system df command?

• Total size of all images

• Size of unused images

• Size shared by multiple images

• Size of individual images