Layer caching and ordering in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile line to set the base image.

Docker

FROM [1]

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

Aubuntu:20.04

BRUN apt-get update

CCOPY . /app

DEXPOSE 80

Attempts:

3 left

💡 Hint

Common Mistakes

Using RUN or COPY instead of FROM for the base image.

Forgetting to specify a tag for the image.

The FROM instruction sets the base image for the Docker build. 'ubuntu:20.04' is a valid base image.

2fill in blank

medium

Complete the Dockerfile line to copy files into the image.

Docker

COPY [1] /app

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

Aapp/

Bapt-get update

C/app

DRUN

Attempts:

3 left

💡 Hint

Common Mistakes

Using commands like RUN instead of a path.

Using absolute paths incorrectly.

COPY copies files or directories from the source (here 'app/') to the destination inside the image.

3fill in blank

hard

Fix the error in the Dockerfile line to install packages.

Docker

RUN apt-get [1] && apt-get install -y curl

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

Ainstall

Bupgrade

Cupdate

Dremove

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'install' instead of 'update' in the first command.

Using 'remove' which deletes packages.

The command 'apt-get update' updates package lists. 'install' is used later to install packages.

4fill in blank

hard

Fill both blanks to create a cache-friendly Dockerfile line that installs packages.

Docker

RUN apt-get [1] && apt-get [2] -y curl wget

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

Aupdate

Binstall

Cremove

Dupgrade

Attempts:

3 left

💡 Hint

Common Mistakes

Swapping the order of commands.

Using 'remove' or 'upgrade' incorrectly.

First, 'apt-get update' refreshes package lists. Then, 'apt-get install -y' installs the packages.

5fill in blank

hard

Fill all three blanks to create a cache-efficient Dockerfile snippet that copies files, installs dependencies, and cleans up.

Docker

COPY [1] /app
RUN apt-get update && apt-get [2] -y python3-pip && apt-get [3] -y

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

Arequirements.txt

Binstall

Cautoremove

Dupdate

Attempts:

3 left

💡 Hint

Common Mistakes

Copying wrong files.

Using 'update' instead of 'install' for package installation.

Not cleaning up unused packages.

Copy the requirements file first, then install packages, and finally clean unused packages to keep image size small.