Image size and minimal base images in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile to use a minimal base image for a Python app.

Docker

FROM [1]
COPY app.py /app.py
CMD ["python", "/app.py"]

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

Anode:latest

Bubuntu:latest

Cdebian:latest

Dpython:3.12-slim

Attempts:

3 left

💡 Hint

Common Mistakes

Using a full OS image like ubuntu increases image size unnecessarily.

Choosing an unrelated base image like node for a Python app.

The python:3.12-slim image is a minimal base image optimized for Python apps, reducing image size.

2fill in blank

medium

Complete the Dockerfile to reduce image size by removing cache after package installation.

Docker

FROM alpine:3.18
RUN apk add --no-cache [1]
CMD ["sh"]

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

Apython3 --cache

Bpython3

Cpython3 --no-cache

Dpython3-cache

Attempts:

3 left

💡 Hint

Common Mistakes

Adding cache flags as part of the package name causes errors.

Not using --no-cache leads to larger images.

The --no-cache flag in apk add prevents caching of the package index, reducing image size.

3fill in blank

hard

Fix the error in the Dockerfile to use a minimal base image for a Node.js app.

Docker

FROM [1]
COPY server.js /server.js
CMD ["node", "/server.js"]

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

Anode:alpine

Bnode:latest

Cnode:slim

Dubuntu

Attempts:

3 left

💡 Hint

Common Mistakes

Using node:latest results in a larger image.

Using ubuntu is not optimized for Node.js apps.

The node:alpine image is a minimal base image for Node.js, reducing image size compared to node:latest.

4fill in blank

hard

Fill both blanks to create a Python Dockerfile that uses a minimal base image and installs packages without cache.

Docker

FROM [1]
RUN apk add --no-cache [2]
CMD ["python3"]

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

Apython:3.12-alpine

Bpython3

C--no-cache

Dpython3-pip

Attempts:

3 left

💡 Hint

Common Mistakes

Using a full Python image increases size.

Not using --no-cache causes larger images.

Use python:3.12-alpine for a minimal Python base image and --no-cache with apk add to avoid cache files.

5fill in blank

hard

Fill all three blanks to create a minimal Dockerfile that copies app files, installs dependencies without cache, and runs the app.

Docker

FROM [1]
COPY [2] /app/
RUN pip install [3] -r /app/requirements.txt
COPY app.py /app/
CMD ["python3", "/app/app.py"]

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

Apython:3.12-alpine

Bapp.py

C--no-cache-dir

Drequirements.txt

Attempts:

3 left

💡 Hint

Common Mistakes

Copying the app.py instead of requirements.txt before installing dependencies.

Not using --no-cache-dir increases image size.

Use python:3.12-alpine for a small base image, copy requirements.txt to install dependencies, and use --no-cache-dir to avoid cache files.