Named build stages in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile to name the first build stage as 'builder'.

Docker

FROM node:18 AS [1]
WORKDIR /app
COPY package.json ./
RUN npm install

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

Abuilder

Bstage1

Cbuild

Dbase

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'build' or 'base' instead of 'builder' which is the conventional name.

Omitting the AS keyword and stage name.

The AS builder syntax names the build stage 'builder'. This name can be used later to refer to this stage.

2fill in blank

medium

Complete the Dockerfile to copy files from the named build stage 'builder'.

Docker

FROM nginx:alpine
COPY --from=[1] /app/build /usr/share/nginx/html

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

Abuild

Bbase

Cstage1

Dbuilder

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'build' or 'base' which are not the correct stage names.

Forgetting to use the --from option.

The --from=builder option copies files from the build stage named 'builder'.

3fill in blank

hard

Fix the error in the Dockerfile by correctly naming the build stage.

Docker

FROM python:3.12 AS [1]
WORKDIR /app
COPY requirements.txt ./
RUN pip install -r requirements.txt

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

Astage

Bbuild-stage

Cbuilder

Dpython-builder

Attempts:

3 left

💡 Hint

Common Mistakes

Using names with hyphens which can cause issues in some contexts.

Using generic names like 'stage' that are not descriptive.

Using 'builder' as the stage name is a clear and common convention for build stages.

4fill in blank

hard

Fill both blanks to create a multi-stage Dockerfile that builds and then copies from the 'builder' stage.

Docker

FROM golang:1.20 AS [1]
WORKDIR /src
COPY . .
RUN go build -o app

FROM alpine:latest
COPY --from=[2] /src/app /usr/local/bin/app

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

Abuilder

Bbuild

Cstage1

Dbase

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names in the AS and --from parts.

Using generic names like 'build' or 'stage1' inconsistently.

Both blanks should be 'builder' to name the build stage and copy from it correctly.

5fill in blank

hard

Fill all three blanks to create a multi-stage Dockerfile with named stages and copy commands.

Docker

FROM rust:1.70 AS [1]
WORKDIR /app
COPY . .
RUN cargo build --release

FROM debian:buster-slim AS [2]
COPY --from=[3] /app/target/release/myapp /usr/local/bin/myapp

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

Abuilder

Bfinal

Cbuild

Dstage

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up stage names between AS and --from.

Using inconsistent or generic names that don't match.

The first stage is named 'builder', the second stage is 'final', and the copy command uses '--from=builder' to get the built app.