Targeting specific stages in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile line to name the build stage.

Docker

FROM alpine AS [1]

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

Astart

Bfinal

Cbuilder

Dbase

Attempts:

3 left

💡 Hint

Common Mistakes

Using reserved words like 'start' or 'final' without context.

The AS builder names the stage 'builder' so it can be referenced later.

2fill in blank

medium

Complete the COPY command to copy files from the 'builder' stage.

Docker

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

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

Abuilder

Bstart

Cbase

Dfinal

Attempts:

3 left

💡 Hint

Common Mistakes

Using a stage name that does not exist.

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

3fill in blank

hard

Fix the error in the FROM line to correctly name the stage.

Docker

FROM node AS [1]

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

Abuild_stage

Bbuild stage

Cbuild.stage

Dbuild-stage

Attempts:

3 left

💡 Hint

Common Mistakes

Using spaces or dots in stage names.

Stage names cannot have spaces or dots. Underscores are allowed, so 'build_stage' is correct.

4fill in blank

hard

Fill both blanks to copy from the 'builder' stage and set the working directory.

Docker

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

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Abuilder

B/app

C/src

Dfinal

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up source and destination paths.

The COPY command uses --from=builder to copy files from the 'builder' stage. The WORKDIR is set to /app to work inside that directory.

5fill in blank

hard

Fill all three blanks to define a multi-stage build with a named stage, copy from it, and set the final command.

Docker

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

FROM alpine
COPY --from=[2] /app/main /usr/local/bin/main
CMD ["[3]"]

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

Abuilder

Cmain

Dstart

Attempts:

3 left

💡 Hint

Common Mistakes

Using different names for the stage and COPY source.

Incorrect CMD syntax.

The first stage is named 'builder'. The COPY command uses --from=builder to get the built binary. The CMD runs the binary named 'main'.