Docker Compose

In previous lessons, we have learned how to create and run single Docker containers. However, in real-world scenarios, applications often require multiple containers, each serving a specific function or component. Here is where Docker Compose comes into play.

What is Docker Compose?

Docker Compose is a tool that allows you to define and run multi-container Docker applications. It is written in YAML (Yet Another Markup Language) and provides a way to configure the services, networks, and dependencies of your application.

How Does Docker Compose Work?

With Docker Compose, you can define a docker-compose.yml file that specifies the configuration of your application's services and their relationships. Each service in the file represents a different container that makes up your application.

Here is an example of a basic docker-compose.yml file:

1version: '3'
2
3services:
4  service1:
5    image: my-image1
6    ports:
7      - 8080:8080
8  service2:
9    image: my-image2
10    ports:
11      - 8081:8081

xxxxxxxxxx

class Main {

  public static void main(String[] args) {

    // Replace with your Docker Compose configuration here

    String dockerComposeConfig = "" +

      "version: '3'

" +

      "services:

" +

      "  service1:

" +

      "    image: my-image1

" +

      "    ports:

" +

      "      - 8080:8080

" +

      "  service2:

" +

      "    image: my-image2

" +

      "    ports:

" +

      "      - 8081:8081";

​

    System.out.println(dockerComposeConfig);

  }

}