Docker Compose: Managing Multi-Container Applications

Docker Compose is a tool that allows you to define and manage multi-container applications using a simple YAML configuration file.

Why Use Docker Compose?

• Manages multiple containers with a single command.
• Defines services, networks, and volumes in a single file.
• Improves workflow for local development and testing.

How Docker Compose Works?

Docker Compose uses a YAML file to define services, networks, and volumes for a multi-container application.

1. Installing Docker Compose

Docker Compose comes pre-installed with Docker Desktop. To install it separately, follow the instructions on the official website.

2. Creating a docker-compose.yml File

Below is an example `docker-compose.yml` file for a simple web application:

version: '3.8'
services:
  web:
    image: nginx
    ports:
      - "8080:80"
  db:
    image: mysql
    environment:
      MYSQL_ROOT_PASSWORD: example
        

3. Running Docker Compose

Use the following command to start the services defined in your `docker-compose.yml`:

docker-compose up -d
        

Conclusion

Docker Compose simplifies multi-container application management. In the next post, we will explore how to use Docker Compose with environment variables and networking.