Scanning images for vulnerabilities in Docker - Mini Project: Build & Apply

Scanning Docker Images for Vulnerabilities

📖 Scenario: You work in a team that builds software using Docker containers. Before deploying containers to production, you need to check if the Docker images have any security problems. This helps keep the software safe and reliable.

🎯 Goal: Learn how to scan a Docker image for vulnerabilities using a simple command-line tool and understand the scan results.

📋 What You'll Learn

Have Docker installed on your computer

Use the docker command line

Use the docker scan command to check images

💡 Why This Matters

🌍 Real World

Scanning Docker images helps teams find security problems before software is released. This keeps users safe and avoids costly fixes later.

💼 Career

DevOps engineers and developers use image scanning to maintain secure container environments in production.

1

Create a Docker image to scan

Create a Dockerfile with the exact content:
FROM alpine:3.18
This will be the image you scan for vulnerabilities.

Docker

# Create a Dockerfile with the line: FROM alpine:3.18

Need a hint?

The Dockerfile must start with FROM alpine:3.18 exactly.

2

Build the Docker image

Build the Docker image with the tag my-alpine using the command:
docker build -t my-alpine .

Docker

FROM alpine:3.18
# Run the command: docker build -t my-alpine . in your terminal

Need a hint?

Use the terminal to run the build command exactly as shown.

3

Scan the Docker image for vulnerabilities

Use the command docker scan my-alpine to scan the image you built for security issues.

Docker

FROM alpine:3.18
# Run the command: docker scan my-alpine in your terminal

Need a hint?

Run the scan command in your terminal to see the vulnerability report.

4

Display the scan results

Show the output of docker scan my-alpine in your terminal. It should list vulnerabilities or say no vulnerabilities found.

Docker

FROM alpine:3.18
# Paste the output of docker scan my-alpine here

Need a hint?

The scan output usually ends with a message like 'No vulnerabilities found' if the image is safe.