The Complete Practical Docker Guide - Cleaning Up My Docker Setup

This video tutorial covers the process of cleaning up Docker containers and images. It begins with listing stopped containers and using the 'docker container prune' command to remove them. The tutorial then explains how to list Docker images and use the 'docker image prune' command to remove unused images, including the difference between unused and dangling images. The video also discusses the structure of Docker images, focusing on file system layers and how they are removed during cleanup. Finally, the tutorial concludes with a brief introduction to the next lecture, which will cover running a simple 'hello world' container.

What command is used to remove all stopped containers in Docker?

• docker container stop

• docker container remove

• docker container delete

• docker container prune

Which command lists all Docker images available on your system?

• docker images

• docker list images

• docker image list

• docker show images

What is a dangling image in Docker?

• An image that is corrupted

• An image with no corresponding version on Docker Hub

• An image that is not tagged

• An image with no associated containers

What does the 'docker image prune -a' command do?

• Removes all images, including those in use

• Removes only unused images

• Removes all unused images, including dangling ones

• Removes all images from Docker Hub

Why might the log output show more lines than the number of images removed?

• Because Docker lists all images ever used

• Because each image consists of multiple file system layers

• Due to a Docker logging error

• Because images are removed one by one