Distroless images concept in Docker - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the Dockerfile line to use a distroless base image for a Go app.

Docker

FROM gcr.io/distroless/[1]

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

Abase

Bnodejs

Cpython3

Dubuntu

Attempts:

3 left

💡 Hint

Common Mistakes

Choosing a full OS image like 'ubuntu' instead of distroless base.

The base distroless image is a minimal image without a package manager or shell, ideal for Go apps.

2fill in blank

medium

Complete the Dockerfile line to copy the binary into the distroless image.

Docker

COPY [1] /app/

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

Amain.go

Bapp_binary

Capp

DDockerfile

Attempts:

3 left

💡 Hint

Common Mistakes

Copying source code files instead of the compiled binary.

You copy the compiled binary (e.g., app_binary) into the image, not source files.

3fill in blank

hard

Fix the error in the Dockerfile command to run the app in a distroless image.

Docker

CMD ["[1]"]

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

Abash

B/usr/bin/python3

C/app/app_binary

D/bin/sh

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to run shell commands in distroless images.

Distroless images do not have shells like /bin/sh. You must run the binary directly, e.g., /app/app_binary.

4fill in blank

hard

Fill both blanks to create a multi-stage Dockerfile using distroless.

Docker

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

FROM gcr.io/distroless/[2]
COPY --from=builder /app/[1] /app/[1]

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

Aapp_binary

Bbase

Cnodejs

Dmain.go

Attempts:

3 left

💡 Hint

Common Mistakes

Using source file names or wrong distroless variants.

The binary is named app_binary and the distroless base image is base.

5fill in blank

hard

Fill all three blanks to complete the Dockerfile for a distroless Node.js app.

Docker

FROM node:18 AS build
WORKDIR /app
COPY package.json package-lock.json ./
RUN npm install
COPY . .
RUN npm run build

FROM gcr.io/distroless/[1]
COPY --from=build /app/[2] /app/[2]
CMD ["[3]", "/app/[2]/index.js"]

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

Anodejs

Bdist

Cnode

Dbase

Attempts:

3 left

💡 Hint

Common Mistakes

Using 'base' image for Node.js or wrong CMD command.

The distroless image for Node.js is nodejs, the build output folder is dist, and the command to run is node.