Docker containerization for Node.js in Node.js - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile to specify the base image for a Node.js app.

Node.js

FROM [1]

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Anode:18-alpine

Bpython:3.9

Cubuntu:latest

Dnginx:stable

Attempts:

3 left

💡 Hint

Common Mistakes

Using a non-Node.js base image like Python or Nginx.

Forgetting to specify a version tag.

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

2fill in blank

medium

Complete the Dockerfile to copy the package.json file into the container.

Node.js

COPY [1] ./

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Apackage.json

Bsrc/package.json

Capp.js

Dnode_modules

Attempts:

3 left

💡 Hint

Common Mistakes

Copying the wrong file like app.js or node_modules.

Using a wrong path like src/package.json when the file is in the root.

The package.json file is copied from the current directory to the container's working directory.

3fill in blank

hard

Fix the error in the Dockerfile command to install dependencies.

Node.js

RUN npm [1]

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Astart

Btest

Cinstall

Dbuild

Attempts:

3 left

💡 Hint

Common Mistakes

Using npm start which runs the app instead of installing.

Using npm build which is not a standard npm command.

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

4fill in blank

hard

Fill both blanks to set the working directory and copy all app files.

Node.js

WORKDIR [1]
COPY [2] ./

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A/usr/src/app

Bsrc/

C.

D/app

Attempts:

3 left

💡 Hint

Common Mistakes

Using relative paths incorrectly for WORKDIR.

Copying from a wrong source directory like src/ when files are in root.

The working directory is set to /usr/src/app, and all files from the current directory . are copied into it.

5fill in blank

hard

Fill all three blanks to expose port 3000, set environment variable NODE_ENV to production, and define the command to start the app.

Node.js

EXPOSE [1]
ENV NODE_ENV=[2]
CMD ["npm", "[3]"]

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Adevelopment

Bproduction

Cstart

D3000

Attempts:

3 left

💡 Hint

Common Mistakes

Exposing the wrong port number.

Setting NODE_ENV to development instead of production.

Using npm run or other commands instead of npm start.

Port 3000 is exposed, environment variable NODE_ENV is set to production, and the app is started with npm start.