How does Spring Boot integrate with a Config Server?

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How can Spring Boot integrate with a Config Server?

1. Add Spring Cloud Config Dependencies:

  • To enable integration with the Config Server, add the necessary Spring Cloud Config dependencies to your Spring Boot project’s pom.xml (for Maven) or build.gradle (for Gradle).
  • Example (Maven):

xml <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-config</artifactId> </dependency>

2. Configure the Config Server URL:

  • In your application.properties or application.yml file, specify the URL of the Config Server that the Spring Boot application will use to fetch configuration properties.
  • Example:

properties spring.cloud.config.uri=http://localhost:8888

3. Enable Spring Cloud Config Client:

  • Spring Boot applications automatically act as config clients when the Spring Cloud Config dependency is included. The application will fetch configurations from the specified Config Server at startup.

4. Organize Configuration Files in the Config Server:

  • Store configuration files in the Config Server’s repository (e.g., Git) with filenames matching the application’s name and environment.
  • Example structure:

/config-repo ├── application.yml ├── my-service-dev.yml ├── my-service-prod.yml

5. Application Fetches Configurations at Startup:

  • When the Spring Boot application starts, it automatically connects to the Config Server and fetches the configuration files based on its spring.application.name and active profile (e.g., dev, prod).
  • The application will fetch the relevant configuration file (e.g., my-service-dev.yml if the active profile is dev).

6. Refresh Configurations Dynamically (Optional):

  • Add the @RefreshScope annotation to beans that should dynamically refresh their configurations when a change occurs.
  • Example:

java @RefreshScope @RestController public class MyController { @Value("${my.config.property}") private String myConfigProperty; }