Reducing image size strategies in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile line to use a minimal base image.

Docker

FROM [1]

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

Acentos:latest

Bubuntu:latest

Calpine:latest

Ddebian:latest

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a full OS base image like ubuntu increases image size.

Using alpine:latest as the base image helps reduce image size because Alpine Linux is very small and lightweight.

2fill in blank

medium

Complete the command to remove unnecessary package lists after installation to reduce image size.

Docker

RUN apk add --no-cache curl && rm -rf [1]

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

A/var/cache/apk/*

B/usr/local/bin/*

C/tmp/*

D/etc/apk/*

Attempts:

3 left

💡 Hint

Common Mistakes

Removing wrong directories that don't reduce image size.

Removing /var/cache/apk/* clears cached package files, reducing image size.

3fill in blank

hard

Fix the error in the Dockerfile line to combine commands and reduce image layers.

Docker

RUN apt-get update && apt-get install -y curl [1] apt-get clean

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

A||

B;

C|

D&&

Attempts:

3 left

💡 Hint

Common Mistakes

Using ';' continues even if previous commands fail.

Using && chains commands so the next runs only if the previous succeeds, combining steps into one layer.

4fill in blank

hard

Fill both blanks to create a multi-stage build that copies only the final binary.

Docker

FROM golang:1.20 AS builder
RUN go build -o app .
FROM [1]
COPY --from=builder [2] /app

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

Aalpine:latest

B/app

C/app/app

Dubuntu:latest

Attempts:

3 left

💡 Hint

Common Mistakes

Using a large base image in the final stage increases size.

The final stage uses alpine:latest for a small image, and copies the built binary /app/app from the builder.

5fill in blank

hard

Fill all three blanks to create a Dockerfile snippet that cleans cache and removes build dependencies.

Docker

RUN apt-get update && apt-get install -y build-essential curl && \
    make build && \
    apt-get purge -y [1] && \
    rm -rf [2] && \
    apt-get autoremove -y && \
    rm -rf [3]

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

Abuild-essential

B/var/lib/apt/lists/*

C/tmp/*

Dcurl

Attempts:

3 left

💡 Hint

Common Mistakes

Not removing build dependencies or cache increases image size.

Removing build-essential and cleaning /var/lib/apt/lists/* and /tmp/* reduces image size by deleting build tools and cache.