7.consul service registration and discovery

Study B Standing still, Mr. Zhou Yang of Silicon Valley SpringCloud The lecture notes

1. Consul brief introduction

1.1 What is it?

1.2 What can I do?

Service discovery : Provide HTTP and DNS Two ways of discovery
Health monitoring : Support multiple protocols ,HTTP、TCP、Docker、Shell Script customization
KV Storage :key , Value Storage mode
Multi-data center :Consul Support multiple data centers
visualization Web Interface

Official website ：https://www.consul.io/intro/index.html
Download address ：https://www.consul.io/downloads.html
Chinese document ：https://www.springcloud.cc/spring-cloud-consul.html

1.3 Install and run Consul

After downloading, there is only one consul.exe file , Double click on the hard disk path to run , View version information

Use development mode to start :consul agent -dev
You can access... Through the following address Consul Home page ：http://localhost:8500

2. newly build Module Payment services provider8006

2.1 newly build module cloud-providerconsul-payment8006

2.2 Change pom

<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <parent>
        <artifactId>springcloud2020</artifactId>
        <groupId>com.atguigu.springcloud</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>cloud-providerconsul-payment8006</artifactId>

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-consul-discovery -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        </dependency>

        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>


        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

</project>

2.3 Change yml

server:
  port: 8006

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

2.4 Startup class and business class

@SpringBootApplication
@EnableDiscoveryClient
public class PaymentMain8006 {
    
    public static void main(String[] args) {
    
        SpringApplication.run(PaymentMain8006.class,args);
    }
}

@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();
    }
}

2.5 Verification test

http://localhost:8006/payment/consul

3. newly build Module Consumer service order8006

3.1 newly build Modulecloud-consumerconsul-order80

3.2 Change pom

    <dependencies>
        <!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-consul-discovery -->
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-consul-discovery</artifactId>
        </dependency>

        <dependency>
            <groupId>com.atguigu.springcloud</groupId>
            <artifactId>cloud-api-commons</artifactId>
            <version>${project.version}</version>
        </dependency>
        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-devtools</artifactId>
            <scope>runtime</scope>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>

        <!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

3.3 Change yml

server:
  port: 80

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

3.4 Startup class and business class

@SpringBootApplication
@EnableDiscoveryClient
public class OrderConsulMain80 {
    
    public static void main(String[] args) {
    
        SpringApplication.run(OrderConsulMain80.class,args);
    }
}

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

@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;
    }
}

3.5 Verification test

http://localhost/consumer/payment/consul

4. The similarities and differences between the three registries

4.1CAP theory

C:Consistency( Strong consistency )
A:Availability( Usability )
P:Partition tolerance( Partition fault tolerance )
CAP Theory focuses on granularity is data , Rather than the overall system design strategy

4.2 The similarities and differences between the three registries

4.2.1AP(Eureka)

4.2.2 CP(Zookeeper/Consul)