Why images are blueprints for containers in Docker - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the command to list all Docker images on your system.

Docker

docker [1]

Drag options to blanks, or click blank then click option'

Astart

Brun

Cbuild

Dimages

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'docker run' instead of 'docker images' to list images.

The docker images command shows all images stored locally. Images are the blueprints for containers.

2fill in blank

medium

Complete the command to create a container from an image named 'nginx'.

Docker

docker [1] nginx

Drag options to blanks, or click blank then click option'

Arun

Bimages

Cbuild

Dpull

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'docker build' instead of 'docker run' to start a container.

The docker run command creates and starts a container from an image.

3fill in blank

hard

Fix the error in this Dockerfile line to set the base image to Ubuntu.

Docker

FROM [1]

Drag options to blanks, or click blank then click option'

Aubuntu:latest

Bnginx

Ccontainer

Drun

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'run' or 'container' instead of a valid image name after FROM.

The FROM instruction sets the base image. ubuntu:latest is the correct image name.

4fill in blank

hard

Fill both blanks to create a dictionary comprehension that maps each container name to its status if the status is 'running'.

Docker

{container['[1]']: container['[2]'] for container in containers if container['status'] == 'running'}

Drag options to blanks, or click blank then click option'

Aname

Bstatus

Cid

Dimage

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'id' or 'image' instead of 'name' or 'status'.

We use 'name' as the key and 'status' as the value to map container names to their statuses.

5fill in blank

hard

Fill all three blanks to create a dictionary comprehension that maps each image's tag to its size if the size is greater than 100MB.

Docker

{image['[1]']: image['[2]'] for image in images if image['[3]'] > 100}

Drag options to blanks, or click blank then click option'

Aid

Bsize

Ctag

Dcreated

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'id' or 'created' instead of 'tag' or 'size'.

The key is the image 'tag', the value is 'size', and the condition checks if 'size' is greater than 100MB.