Docker Remove Unused Docker Objects

Introduction

In this lab, we will dive into the mysterious world of Docker pruning with a setting inspired by the Victorian era. Our scene is set in the dimly lit streets of London, where a renowned detective is on the trail of unused Docker objects. The detective must navigate through the cluttered Docker containers and images to uncover hidden secrets of unused objects.

Initiating the Investigation

In this step, we guide the students through the process of identifying and removing unused Docker containers, images, volumes, and networks using the docker prune command.

First, let's ensure the docker environment is set up:

docker pull hello-world

Next, students are instructed to remove the unused Docker objects:

1. First, prepare the needed environment using the following commands:

   docker container run hello-world
   docker network create example_network
   docker image pull alpine
   docker container run --name temp_container -d alpine sleep 1000
   

2. Using the docker prune command to remove images and network:

   docker stop temp_container
   docker rm temp_container
   docker image prune -a
   docker network prune
   

Confirming the Investigation

In this step, students will continue the investigation to ensure the unused Docker objects have been successfully pruned.

docker system prune -a

Summary

In this lab, you learned how to identify and remove unused Docker objects to free up disk space and improve system performance. You practiced using Docker prune commands to clean up dangling images, stopped containers, and unused networks. These skills will help you maintain clean and efficient Docker environments in your future projects.