Create a Config Server Application

Oct 13, 2025 by wbrum.org 67 views

Introduction

In this article, we will explore the configuration of a config server application that fetches properties from a GitHub repository. The config server application will be created, pushed to a GitHub repository, and made available for others to clone and use. The application will run on port 8888.

Prerequisites

Before we begin, make sure you have the following prerequisites installed:

Java Development Kit (JDK) 8 or later
Maven 3 or later
Git 2 or later
Spring Boot 2 or later

Create a Config Server Application

To create a config server application, we will use Spring Boot. Spring Boot is a popular framework for building web applications quickly and easily.

Step 1: Create a New Maven Project

Create a new Maven project using your preferred IDE or by running the following command in your terminal:

mvn archetype:generate -DgroupId=com.example -DartifactId=config-server -DarchetypeArtifactId=maven-archetype-quickstart -DinteractiveMode=false

Step 2: Add Spring Boot Dependencies

Add the following dependencies to your pom.xml file:

<dependencies>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-config</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-web</artifactId>
    </dependency>
    <dependency>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-test</artifactId>
        <scope>test</scope>
    </dependency>
</dependencies>

Step 3: Create a Config Server Configuration Class

Create a new class called ConfigServerConfig that will contain the configuration for the config server:

@Configuration
@RefreshScope
public class ConfigServerConfig {
    
    @Value("${config.server.port}")
    private int port;
    
    @Bean
    public ServerProperties serverProperties() {
        return new ServerProperties();
    }
    
    @Bean
    public ConfigServerProperties configServerProperties() {
        return new ConfigServerProperties();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReader configServerPropertiesBeanDefinitionReader() {
        return new ConfigServerPropertiesBeanDefinitionReader();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanPostProcessor configServerPropertiesBeanDefinitionReaderBeanPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanPostProcessorBeanFactoryPostProcessor configServerPropertiesBeanDefinitionReaderBeanPostProcessorBeanFactoryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanPostProcessorBeanFactoryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor();
    }
    
    @Bean
    public ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessor configServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPostProcessor() {
        return new ConfigServerPropertiesBeanDefinitionReaderBeanFactoryPostProcessorBeanDefinitionRegistryPostProcessorBeanFactoryPost<br/>
**Config Server Configuration Q&A**
=====================================

**Q: What is a Config Server?**
---------------------------

A: A Config Server is a centralized application that manages and distributes configuration properties to other applications in a microservices architecture.

**Q: Why do I need a Config Server?**
--------------------------------

A: A Config Server provides several benefits, including:

* Centralized management of configuration properties
* Easy updates and changes to configuration properties
* Reduced coupling between applications
* Improved scalability and flexibility

**Q: How does a Config Server work?**
-----------------------------------

A: A Config Server works by:

* Fetching configuration properties from a centralized repository (e.g. GitHub)
* Providing a REST API for other applications to retrieve configuration properties
* Supporting features like property overriding and refresh

**Q: What are the benefits of using a Config Server?**
------------------------------------------------

A: The benefits of using a Config Server include:

* Improved scalability and flexibility
* Reduced coupling between applications
* Easy updates and changes to configuration properties
* Centralized management of configuration properties

**Q: How do I implement a Config Server using Spring Boot?**
---------------------------------------------------------

A: To implement a Config Server using Spring Boot, you can follow these steps:

* Create a new Spring Boot project
* Add the Spring Boot Config Server dependency
* Configure the Config Server to fetch properties from a centralized repository (e.g. GitHub)
* Create a REST API for other applications to retrieve configuration properties

**Q: What are some common use cases for a Config Server?**
---------------------------------------------------

A: Some common use cases for a Config Server include:

* Managing database connection properties
* Configuring API endpoints and authentication
* Setting up logging and monitoring
* Managing application settings and preferences

**Q: How do I secure a Config Server?**
--------------------------------------

A: To secure a Config Server, you can:

* Use authentication and authorization mechanisms (e.g. OAuth, JWT)
* Encrypt configuration properties
* Use a secure protocol (e.g. HTTPS) for communication
* Implement rate limiting and IP blocking

**Q: What are some best practices for implementing a Config Server?**
----------------------------------------------------------------

A: Some best practices for implementing a Config Server include:

* Use a centralized repository for configuration properties
* Use a consistent naming convention for configuration properties
* Use environment-specific configuration files
* Implement property overriding and refresh

**Q: How do I troubleshoot issues with a Config Server?**
---------------------------------------------------

A: To troubleshoot issues with a Config Server, you can:

* Check the application logs for errors
* Verify that the Config Server is properly configured
* Test the Config Server API using a tool like Postman
* Consult the Spring Boot documentation for troubleshooting tips

**Q: What are some common issues with a Config Server?**
---------------------------------------------------

A: Some common issues with a Config Server include:

* Configuration property not being updated
* Configuration property not being retrieved
* Config Server not starting properly
* Config Server not responding to requests

**Q: How do I upgrade a Config Server?**
-----------------------------------------

A: To upgrade a Config Server, you can:

* Check the Spring Boot documentation for upgrade instructions
* Verify that the new version is compatible with your existing configuration
* Test the new version in a non-production environment
* Deploy the new version to production

**Q: What are some best practices for maintaining a Config Server?**
----------------------------------------------------------------

A: Some best practices for maintaining a Config Server include:

* Regularly update and patch the Config Server
* Monitor the Config Server for performance and security issues
* Test the Config Server regularly
* Consult the Spring Boot documentation for maintenance tips