docker compose up and down - Mini Project: Build & Apply

Using Docker Compose to Start and Stop Containers

📖 Scenario: You are working on a small web application that uses two services: a web server and a database. You want to manage these services easily using Docker Compose.

🎯 Goal: Learn how to write a simple docker-compose.yml file to define two services, then use docker compose up to start them and docker compose down to stop and remove them.

📋 What You'll Learn

Create a docker-compose.yml file with two services: web and db

The web service uses the nginx:latest image

The db service uses the mysql:5.7 image

Use docker compose up to start the services

Use docker compose down to stop and remove the services

💡 Why This Matters

🌍 Real World

Docker Compose is widely used to manage multi-container applications easily on a developer's machine or in testing environments.

💼 Career

Knowing how to use Docker Compose is essential for DevOps roles to automate and manage containerized applications efficiently.

1

Create the docker-compose.yml file with two services

Create a file named docker-compose.yml with two services: web using the image nginx:latest and db using the image mysql:5.7. Use version '3.8' at the top.

Docker

# Write the docker-compose.yml content here
# Your code here

Need a hint?

Start with version: '3.8', then add services with web and db keys and their images.

2

Add environment variable for MySQL root password

Add an environment variable MYSQL_ROOT_PASSWORD with value example under the db service in docker-compose.yml.

Docker

version: '3.8'
services:
  web:
    image: nginx:latest
  db:
    image: mysql:5.7
    # Add environment variable MYSQL_ROOT_PASSWORD=example below
    # Your code here

Need a hint?

Under db, add environment: and then MYSQL_ROOT_PASSWORD: example.

3

Start the services using docker compose up

Run the command docker compose up -d in the terminal to start the web and db services in detached mode.

Docker

# Run the command to start services in detached mode
# Your code here

Need a hint?

Use docker compose up -d to start services in the background.

4

Stop and remove the services using docker compose down

Run the command docker compose down in the terminal to stop and remove the web and db services.

Docker

# Run the command to stop and remove services
# Your code here

Need a hint?

Use docker compose down to stop and clean up the containers.