Introduction In the previous blog post, you learned how to containerize a Spring Boot project with Docker. Now, let's take it a step further and explore Docker Compose, a powerful tool for defining and running multi-container Docker applications. We'll delve into orchestrating multiple Spring Boot microservices using Docker Compose, making it easier to manage, scale, and deploy your application. Prerequisites Ensure you have Docker and Docker Compose installed on your machine. Docker: Install Docker Docker Compose: Install Docker Compose

Step 1: Define Docker Compose YAML Create a 'docker-compose.yml' file in the root of your project to define the services, networks, and volumes for your microservices. Consider including services for your Spring Boot applications, a database, and any other components.

version: '3'

services:
  service1:
    image: your-service1-image
    ports:
      - "8081:8080"
    depends_on:
      - database

  service2:
    image: your-service2-image
    ports:
      - "8082:8080"
    depends_on:
      - database

  database:
    image: postgres:latest
    environment:
      POSTGRES_DB: your-database
      POSTGRES_USER: your-username
      POSTGRES_PASSWORD: your-password

You can Learn more on the docker-compose.yml file here

Step 2: Launch Microservices Run the following command to start your microservices stack:

docker-compose up

Visit http://localhost:8081 and http://localhost:8082 to ensure your microservices are running. Step 3: Scaling Microservices Explore the ability to scale your microservices effortlessly with Docker Compose. Demonstrate how to scale the number of instances for a specific service and observe load balancing in action.

docker-compose up --scale service1=3

Conclusion By orchestrating your Spring Boot microservices with Docker Compose, you've taken a crucial step toward building scalable and maintainable applications. This guide has introduced you to the basics of defining a multi-container environment, launching your microservices stack, and even scaling your services dynamically. As you continue to explore the world of container orchestration, consider diving into more advanced topics like service discovery, health checks, and deploying to a production environment. Happy orchestrating!

Scaling Microservices (Spring Boot) with Docker Compose

"Every great developer you know got there by solving problems they were unqualified to solve until they actually did it." - Patrick McKenzie

December 20, 2023

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