Multi-stage builds in Microservices - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to specify the base image for the build stage.

Microservices

FROM [1] AS builder

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

Apython:3.9-slim

Bnode:18-alpine

Cubuntu:latest

Dalpine:edge

Attempts:

3 left

💡 Hint

Common Mistakes

Using a generic OS image like ubuntu without necessary build tools.

Choosing an image that does not match the application language.

The node:18-alpine image is a lightweight base suitable for building Node.js applications in the builder stage.

2fill in blank

medium

Complete the code to copy source files into the builder stage.

Microservices

COPY [1] /app

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

A.

B/src

C/app

D./build

Attempts:

3 left

💡 Hint

Common Mistakes

Using incorrect source paths that do not exist in the build context.

Copying only partial files causing build failures.

The dot . means copying all files from the current directory into the /app directory inside the container.

3fill in blank

hard

Fix the error in the final stage to copy only the built files from the builder stage.

Microservices

COPY --from=[1] /app/dist /app

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

Abuilder

Bfinal

Cbuild

Dsource

Attempts:

3 left

💡 Hint

Common Mistakes

Using a stage name that does not exist causing build errors.

Copying from the wrong stage resulting in missing files.

The --from=builder flag copies files from the stage named builder, which contains the built application.

4fill in blank

hard

Fill both blanks to define the final image and set the working directory.

Microservices

FROM [1]
WORKDIR [2]

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

Anode:18-alpine

B/app

C/usr/src/app

Dubuntu:20.04

Attempts:

3 left

💡 Hint

Common Mistakes

Using a heavy base image increasing final image size.

Not setting the working directory causing command failures.

The final image uses node:18-alpine for a lightweight runtime, and the working directory is set to /usr/src/app where the app files are copied.

5fill in blank

hard

Fill all three blanks to complete the multi-stage Dockerfile snippet for building and running a microservice.

Microservices

FROM [1] AS builder
COPY [2] /src
RUN npm install && npm run build
FROM [3]
COPY --from=builder /src/dist /app
CMD ["node", "/app/index.js"]

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

Anode:18-alpine

B.

Cnode:18-slim

D/src

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up source paths causing copy errors.

Using the same image for both stages increasing image size.

The builder stage uses node:18-alpine for building. The source files are copied from the current directory .. The final stage uses node:18-slim for a smaller runtime image.