Multiple FROM statements in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile to start a multi-stage build with the base image.

Docker

FROM [1]

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Anode:14

Bubuntu:20.04

Cpython:3.9

Dalpine:latest

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a heavy image for the first stage unnecessarily increases build size.

The FROM instruction starts the build with the specified base image. Here, alpine:latest is a small, efficient base image commonly used for multi-stage builds.

2fill in blank

medium

Complete the Dockerfile to name the first build stage.

Docker

FROM alpine:latest AS [1]

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Afinal

Bbuilder

Cbase

Druntime

Attempts:

3 left

💡 Hint

Common Mistakes

Using final for the first stage name, which is usually reserved for the last stage.

In multi-stage builds, naming the first stage builder is a common practice to indicate it is used for building the application.

3fill in blank

hard

Fix the error in the second FROM statement to use the first stage correctly.

Docker

FROM [1] AS final

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Aalpine:latest

Bubuntu:20.04

Cbuilder

Dnode:14

Attempts:

3 left

💡 Hint

Common Mistakes

Using a base image name instead of the stage name causes build errors.

The second FROM uses the name of the first stage (builder) to copy artifacts from it. Using the stage name allows copying files without rebuilding.

4fill in blank

hard

Fill both blanks to copy the built app from the first stage and set the working directory.

Docker

COPY --from=[1] /app/build /app
WORKDIR [2]

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Abuilder

B/app

C/usr/src/app

Dfinal

Attempts:

3 left

💡 Hint

Common Mistakes

Using the wrong stage name or incorrect working directory path.

The COPY --from=builder copies files from the builder stage. Setting WORKDIR /app sets the working directory for following commands.

5fill in blank

hard

Fill all three blanks to complete the multi-stage Dockerfile that builds and runs a Node.js app.

Docker

FROM node:14 AS [1]
WORKDIR [2]
RUN npm install

FROM [3]
COPY --from=[1] [2] [2]

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Abuilder

B/usr/src/app

Cnode:14

Dfinal

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing stage names or base images causes build or runtime errors.

The first stage is named builder and uses node:14. The working directory is set to /usr/src/app. The second stage starts from node:14 and copies files from the builder stage.