Multi-stage builds concept in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile line to start a new build stage named 'builder'.

Docker

FROM golang:1.20 AS [1]

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

Abuilder

Bruntime

Cbase

Dfinal

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'final' as the first stage name instead of 'builder'.

Omitting the stage name after AS.

The AS builder part names the build stage 'builder' for later reference.

2fill in blank

medium

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

Docker

COPY --from=[1] /app/myapp /usr/local/bin/myapp

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

Aruntime

Bfinal

Cbase

Dbuilder

Attempts:

3 left

💡 Hint

Common Mistakes

Using a stage name that does not exist.

Forgetting to use the --from option.

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

3fill in blank

hard

Fix the error in the Dockerfile line to correctly name the final stage.

Docker

FROM alpine AS [1]

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

Abuilder

Bbuild

Cfinal

Dcompile

Attempts:

3 left

💡 Hint

Common Mistakes

Naming the final stage 'builder' which is confusing.

Using inconsistent stage names.

The final stage is commonly named 'final' to distinguish it from build stages.

4fill in blank

hard

Fill both blanks to complete the multi-stage build Dockerfile snippet.

Docker

RUN go build -o /app/myapp [1] && \
COPY --from=[2] /app/myapp /usr/local/bin/myapp

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A./src

Bbuilder

Cfinal

D./app

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong source path in the build command.

Copying from the wrong stage name.

The build command uses the source directory './src'. The copy command pulls from the 'builder' stage.

5fill in blank

hard

Fill all three blanks to complete the multi-stage Dockerfile for a Go app.

Docker

FROM golang:1.20 AS [1]
WORKDIR /src
COPY . .
RUN go build -o /app/myapp [2]
FROM alpine AS [3]
COPY --from=builder /app/myapp /usr/local/bin/myapp
CMD ["myapp"]

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

Abuilder

B./src

Cfinal

Druntime

Attempts:

3 left

💡 Hint

Common Mistakes

Mixing up stage names.

Using incorrect source path in build command.

The first stage is named 'builder'. The build command uses './src' as source. The final stage is named 'final'.