SpringCloud integrates Consul to implement service registration center

Reprinted Disclaimer: The source of the article is to carry sacks of teenager

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Write at the beginning

  Continued from the previous article: Spring Cloud integrates Eureka to implement a service registry . With the closed source of Eureka 2.0 stop. As the preferred service registration and discovery component of Spring Cloud, Eureka's status as a prince is not guaranteed.

  In addition to the Zookeeper already introduced, it can be used as the service registry of Spring Cloud Consul 也可以作为 Spring Cloud 的服务注册中心. Although Eureka, Zookeeper, and Consul can all be used as the service registry of Spring Cloud, but 它们的实现原理都是相通的.

Next, let's get to know Consul first.

1. Introduction of Consul

  This article only uses Consul as a Spring Cloud service registry, and other functions will not be introduced.

  Consul official website: https://www.consul.io/intro/index.html . Consul is set by HashiCorp company with development.开源的 分布式服务发现和配置管理系统Go语言

  Consul provides micro-services system 服务治理, 配置中心, 控制总线and other functions. Each of these functions can be used individually or together to build a comprehensive service grid. In short, Consul provides a complete set of service grid solutions.

  Download link: https://www.consul.io/downloads.html

  Attachment: Spring Cloud Consul Chinese Document Reference Manual: https://www.springcloud.cc/spring-cloud-consul.html

Consul advantages:

1. Based on Raft protocol, relatively concise
2. Support health check
3. Support both HTTP and DNS protocol service discovery methods
4. Support KV key-value storage (similar to Redis)
5. Support multiple data centers
6. Provides a visual web management interface
7. Support Linux, Mac, Windows
   

Consul Service Registry Architecture

2. Preparation

1. Consul installation

  Now that you want to use Consul as the service registry of Spring Cloud, you must first install a Consul. Used here Windows 64 bit 版本, just unzip the downloaded file, there is only one after unzip consul.exe 文件. Double-click to open it to run.

  Through the cmd command line, enter the directory where consul.exe is located, and use the command: consul --versionyou can view the version number; through the command: consul agent -devuse the development mode to start.

The startup process, as shown in the figure : Enter the web management page

through http://localhost:8500 :

So far, the Consul client installation is complete. If you are in a Linux environment, you can also install the Consul Linux client.

2. Realize the construction of service registration center based on Consul

2.1 Operation at the service provider

 The module name is defined as:, cloud-providerconsul-payment8006to act as a service provider.

Ⅰ. Pom.xml introduces dependencies

 The introduction of spring-cloud-starter-consul-discoverydependency.

<!--整合 springcloud-consul 依赖-->
<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter-consul-discovery</artifactId>
</dependency>

 
  
  

 
  
  

   
   
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Ⅱ. Application.yml configuration file modification

server:
  port: 8006

spring :
application : #service name
name : consul - provider - payment
cloud :
consul : #consul address
host : localhost
port : 8500
discovery :
service-name : $ { spring.application.name }

Ⅲ. Write the controller

@RestController
@Slf4j
public class PaymentController {
    
    
    @Value("${server.port}")
    private String serverPort;
    @GetMapping(value = "/payment/consul")
    public String paymentConsul(){
    
    
        return "springcloud with consul: "+serverPort+"\t"+ UUID.randomUUID().toString();
    }
}

 
  
  

Ⅳ. Project start

  Start the cloud-providerconsul-payment8006service providing module, and through the Consul web management interface, we can find that the current service has been successfully registered. As shown below:

2.2. Operation on the service consumer

 The module name is defined as:, cloud-consumerconsul-order80to act as a service consumer.

Ⅰ pom.xml introduces dependencies

 With 服务提供模块the same. Also need to introduce spring-cloud-starter-consul-discoverydependencies.

<!--整合 springcloud-consul 依赖-->
<dependency>
	<groupId>org.springframework.cloud</groupId>
	<artifactId>spring-cloud-starter-consul-discovery</artifactId>
</dependency>

 
  
  

Ⅱ. Application.yml configuration file modification

server:
  port: 80
spring:
  application:
    name: consul-consumer-order
  cloud:
    consul:
      host: localhost
      port: 8500
      discovery:
        service-name: ${
    
    spring.application.name}

 
  
  

Ⅲ. Use RestTemplate to make service calls

@Configuration
public class ApplicationContextConfig {
    
    
    @LoadBalanced
    @Bean
    public RestTemplate getRestTemplate(){
    
    
        return new RestTemplate();
    }
}

 
  
  

Ⅳ. Write the controller

@RestController
@Slf4j
public class OrderConsulController {
    
    
    public static final String INVOME_URL = "http://consul-provider-payment";
    @Resource
    private RestTemplate restTemplate;
    @GetMapping("/consumer/payment/consul")
    public String payment (){
    
    
        String result = restTemplate.getForObject(INVOME_URL+"/payment/consul",String.class);
        return result;
    }
}

 
  
  

Ⅴ. Project start

  Start the cloud-consumerconsul-order80consumption module, and through the Consul web management interface, we can also find that the current service has been successfully registered. As shown below:

3. Interface call test

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