Docker containerization in Flask - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the base image in a Dockerfile for a Flask app.

Flask

FROM [1]

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Aubuntu:20.04

Bnode:latest

Cpython:3.12-slim

Dalpine:latest

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a Node.js or Ubuntu image which is not optimized for Python Flask apps.

The base image python:3.12-slim is a lightweight Python image suitable for Flask apps.

2fill in blank

medium

Complete the code to copy the Flask app files into the Docker image.

Flask

COPY [1] /app

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Aapp.py

B.

CDockerfile

Drequirements.txt

Attempts:

3 left

💡 Hint

Common Mistakes

Copying only requirements.txt or app.py which misses other needed files.

Copying . copies all files from the current directory into the image's /app folder.

3fill in blank

hard

Fix the error in the Dockerfile command to install dependencies.

Flask

RUN pip install -r [1]

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Arequirements.txt

BDockerfile

Capp.py

Dsetup.py

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to install from app.py or Dockerfile which are not package lists.

The dependencies are listed in requirements.txt, so pip installs from that file.

4fill in blank

hard

Fill both blanks to set the working directory and expose the Flask app port.

Flask

WORKDIR [1]
EXPOSE [2]

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A/app

B8080

C5000

D/usr/src/app

Attempts:

3 left

💡 Hint

Common Mistakes

Exposing the wrong port or setting the wrong working directory.

The working directory is set to /app where the app files are copied. Flask's default port is 5000, so we expose that.

5fill in blank

hard

Fill all three blanks to define the command that runs the Flask app inside the container.

Flask

CMD ["[1]", "[2]", "[3]"]

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Apython

Bapp.py

C-m

Dflask

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'flask' directly without python or missing the module flag.

The command runs Python with the script app.py to execute the Flask app.