Why Docker in CI/CD matters - Test Your Understanding

Practice - 5 Tasks

1fill in blank

easy

Complete the code to build a Docker image named 'app' from the current directory.

Docker

docker build -t app [1] Dockerfile .

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

A-d

B-f

C-p

D-t

Attempts:

3 left

💡 Hint

Common Mistakes

Using -d which runs containers detached, not for building images.

The -f option specifies the Dockerfile to use. Here, it points to the current directory's Dockerfile.

2fill in blank

medium

Complete the command to run a Docker container named 'web' in detached mode.

Docker

docker run --name web [1] nginx

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

A-it

B-rm

C-p

D-d

Attempts:

3 left

💡 Hint

Common Mistakes

Using -it which runs the container interactively.

The -d option runs the container in detached mode, meaning it runs in the background.

3fill in blank

hard

Fix the error in the command to push the Docker image 'app' to Docker Hub.

Docker

docker push [1]/app

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

Ausername

Bapp

Clatest

Ddocker

Attempts:

3 left

💡 Hint

Common Mistakes

Pushing without username causes 'repository not found' errors.

You must prefix the image name with your Docker Hub username to push it correctly.

4fill in blank

hard

Fill both blanks to create a Dockerfile that uses the 'python:3.12' image and copies 'app.py' into the container.

Docker

FROM [1]
COPY [2] /app.py

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

Apython:3.12

Bapp.py

Cnginx:latest

Drequirements.txt

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong base image or copying wrong files.

The FROM line sets the base image. The COPY line copies the local app.py file into the container.

5fill in blank

hard

Fill all three blanks to define a Docker Compose service named 'web' that builds from the current directory, maps port 5000, and restarts always.

Docker

services:
  web:
    build: [1]
    ports:
      - "[2]:5000"
    restart: [3]

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

A.

B5000

Calways

Dnever

Attempts:

3 left

💡 Hint

Common Mistakes

Wrong build path, incorrect port mapping, or wrong restart policy.

The build path is current directory .. The port mapping exposes port 5000. The restart policy always restarts the container if it stops.