Development vs production Dockerfiles - Interactive Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile line to set the base image for development.

Docker

FROM [1]

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

Anode:18-alpine

Bubuntu:latest

Cpython:3.12-slim

Dnginx:stable

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a base image unrelated to the app language.

The development Dockerfile often uses a lightweight Node.js image like node:18-alpine for faster builds and smaller size.

2fill in blank

medium

Complete the command to copy source code into the container in the development Dockerfile.

Docker

COPY [1] /app

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Asrc/

Bdist/

Cnode_modules/

Dconfig/

Attempts:

3 left

💡 Hint

Common Mistakes

Copying built files instead of source code.

In development, we copy the src/ folder to have the latest source code inside the container.

3fill in blank

hard

Fix the error in the production Dockerfile line that installs dependencies.

Docker

RUN npm [1] --production

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

Arun

Bupdate

Cinstall

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using npm run or npm start instead of install.

The correct command to install dependencies is npm install --production to install only production packages.

4fill in blank

hard

Fill both blanks to set the working directory and expose the port in the production Dockerfile.

Docker

WORKDIR [1]
EXPOSE [2]

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A/app

B3000

C8080

D/usr/src/app

Attempts:

3 left

💡 Hint

Common Mistakes

Using development paths or wrong ports.

Production Dockerfiles often use /usr/src/app as the working directory and expose port 3000 for the app.

5fill in blank

hard

Fill all three blanks to create a multi-stage production Dockerfile that builds and runs the app.

Docker

FROM node:18-alpine AS builder
WORKDIR [1]
COPY package.json .
RUN npm install
COPY . .
RUN npm run build

FROM node:18-alpine
WORKDIR [2]
COPY --from=builder [1]/[3] ./
CMD ["node", "dist/index.js"]

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

A/app

B/usr/src/app

Cdist

Dsrc

Attempts:

3 left

💡 Hint

Common Mistakes

Using different working directories or copying wrong folders.

The builder and final stages use /usr/src/app as working directory. The built files are in dist folder copied from builder.