Removing images in Docker - Mini Project: Build & Apply

Removing Docker Images

📖 Scenario: You are managing Docker images on your local machine. Over time, unused images take up space. You want to clean up by removing specific images safely.

🎯 Goal: Learn how to list Docker images, select an image by its ID, and remove that image using Docker commands.

📋 What You'll Learn

List Docker images using the docker images command

Identify the image ID of a specific image

Remove a Docker image using the docker rmi command with the image ID

💡 Why This Matters

🌍 Real World

Docker images can accumulate and use disk space. Removing unused images helps keep your system clean and efficient.

💼 Career

Knowing how to manage Docker images is essential for DevOps roles to maintain healthy container environments.

1

List Docker images

Run the command docker images to list all Docker images on your machine.

Docker

# Run the command to list Docker images
# Your code here

Need a hint?

Use the docker images command to see all images.

2

Identify the image ID

From the list of images, find the image ID of the image named hello-world. Assign this ID to a variable called image_id in your shell.

Docker

docker images
# Assign the image ID of 'hello-world' to a variable called image_id
# Your code here

Need a hint?

Use docker images --filter=reference=hello-world --format "{{.ID}}" to get the image ID.

3

Remove the Docker image

Use the command docker rmi with the variable image_id to remove the hello-world image.

Docker

docker images
image_id=$(docker images --filter=reference=hello-world --format "{{.ID}}")
# Remove the image using docker rmi and image_id
# Your code here

Need a hint?

Use docker rmi $image_id to remove the image.

4

Verify image removal

Run docker images again to verify that the hello-world image has been removed.

Docker

docker images
image_id=$(docker images --filter=reference=hello-world --format "{{.ID}}")
docker rmi $image_id
# Verify removal by listing images again
# Your code here

Need a hint?

After removal, hello-world should no longer appear in the list.