Compose file versioning in Docker - Mini Project: Build & Apply

Compose file versioning

📖 Scenario: You are setting up a Docker Compose file to run a simple web application. You want to specify the version of the Compose file format to ensure compatibility with your Docker environment.

🎯 Goal: Create a Docker Compose file with a specific version, add a service configuration, and display the version used.

📋 What You'll Learn

Create a Docker Compose file with version '3.8'

Add a service named 'web' using the 'nginx:latest' image

Print the Compose file version to confirm

💡 Why This Matters

🌍 Real World

Docker Compose files are used to define and run multi-container Docker applications. Specifying the version ensures compatibility with Docker features.

💼 Career

Understanding Compose file versioning helps in configuring containerized applications reliably, a key skill for DevOps roles.

1

Create the Compose file with version

Create a dictionary called compose_file with a key version set to the string '3.8'.

Docker

# Your code here

Need a hint?

Use a Python dictionary with the key 'version' and value '3.8'.

2

Add a service configuration

Add a key services to the compose_file dictionary. Set it to a dictionary with a key web whose value is another dictionary with the key image set to 'nginx:latest'.

Docker

compose_file = {
    'version': '3.8'
}
# Your code here

Need a hint?

Remember to nest dictionaries for services and the web service configuration.

3

Access the Compose file version

Create a variable called version_used and set it to the value of the version key in the compose_file dictionary.

Docker

compose_file = {
    'version': '3.8',
    'services': {
        'web': {
            'image': 'nginx:latest'
        }
    }
}
# Your code here

Need a hint?

Use dictionary key access to get the version value.

4

Print the Compose file version

Write a print statement to display the text "Compose file version: " followed by the value of version_used.

Docker

compose_file = {
    'version': '3.8',
    'services': {
        'web': {
            'image': 'nginx:latest'
        }
    }
}
version_used = compose_file['version']
# Your code here

Need a hint?

Use string concatenation or f-string to combine the text and variable.