Docker containerization in Express - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the base image in the Dockerfile.

Express

FROM [1]

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

Amysql:8

Bnode:18-alpine

Cubuntu:latest

Dpython:3.12

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a Python or MySQL image instead of Node.js.

Using a heavy Ubuntu image unnecessarily.

The base image node:18-alpine is a lightweight Node.js image suitable for Express apps.

2fill in blank

medium

Complete the Dockerfile line to copy your app files into the container.

Express

COPY [1] /app

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A.

Bnode_modules

Cpackage.json

DDockerfile

Attempts:

3 left

💡 Hint

Common Mistakes

Copying only package.json misses other app files.

Copying node_modules is not recommended.

Using . copies all files from the current directory into the container's /app folder.

3fill in blank

hard

Fix the error in the Dockerfile command to install dependencies.

Express

RUN npm [1]

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Ainstall

Bstart

Cbuild

Dtest

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'npm start' instead of 'npm install' in the Dockerfile.

Trying to build or test before installing dependencies.

The command npm install installs all dependencies listed in package.json.

4fill in blank

hard

Fill both blanks to expose the correct port and set the container's working directory.

Express

WORKDIR [1]
EXPOSE [2]

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A/app

B3000

C/usr/src/app

D8080

Attempts:

3 left

💡 Hint

Common Mistakes

Using a wrong working directory path.

Exposing a port not used by the app.

The working directory is set to /app where the app files are copied. Express apps commonly use port 3000.

5fill in blank

hard

Fill both blanks to define the command that starts the Express app.

Express

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

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

Anode

Bapp.js

Cserver.js

Dnpm

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'npm' instead of 'node' in CMD.

Using wrong script file names.

The command uses node to run the main app file app.js.