Config Server

As part of our application development we will use several configuration properties.

Ex:

a) data source properties

b) actuator properties

c) security properties

d) SMTP properties

e) Kafka properties

f) application messages etc..

-> As of now we configured those configuration properties in the application.properties / application.yml file.

-> application.properties / application.yml file will be available within the project

-> When we package our boot application for deployment our configuration properties will be part of that packaged file

Note: If we want to change any configuration properties then we have to package our application again and we have to re-deploy our application (This is not recommended).

-> To avoid this problem we will keep configuration properties outside of the project.

Config server is used to externalize application configuration properties 

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-> Using Config Server we can load Configuration Properties from outside of the project

-> When we want to change any configuration properties we no need to re-package and re-deploy our application.

-> Using Config Server we can de-couple our application and configuration properties

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1) Create Git Hub Repository and keep configuration properties in git hub repo.

Note: We need use application name for configuration properties/yml file name

Ex:

welcome.yml

welcome-dev.yml

welcome-prod.yml

admin.yml

admin-dev.yml

admin-prod.yml

reports.yml

reports-dev.yml

reports-prod.yml

Git Repo URL : https://github.com/debasis/configuration_properties.git

Config Server Project

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1) Create Boot application with below dependencies

a) config-server

b) actuator

2) Write @EnableConfigServer annotation at boot start class

3) Configure below properties in application.yml file

spring:

  cloud:

    config:

      server:

        git:

          uri: https://github.com/debasis/configuration_properties

          clone-on-start: true

management:

  security:

    enabled: false

Microservice To Load Config Properties using Config Server (Config Client App)

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1) Create Boot application with below dependencies

a) config-client

b) web-starter

c) cloud-bootstrap

2) Configure application name, application port, config-server-url, profile

a) bootstrap.yml (app-name & config-server-url)

spring:

  application:

    name: welcome

  cloud:

    config:

      uri: http://localhost:8080

b) application.yml (server port)

server:

  port: 9090

3) Create Rest Controller with required methods

@RestController

@RefreshScope

public class WelcomeRestController {

@Value("${msg:Config Server Not Working}")

private String msg;

@GetMapping("/")

public String getWelcomeMsg() {

return msg;

}

}

4) Run the application and test it.