Consul服务注册用法

1.下载consul

Install Consul | Consul - HashiCorp LearnInstall a Consul agent on your local machine that you will use in subsequent tutorials to explore Consul's core capabilities.

https://learn.hashicorp.com/consul/getting-started/install.html

下载完成之后只有一个exe文件，在该目录下使用consul agent -dev命令运行，或者配置环境变量可以直接运行。

 2.consul的应用

新建服务提供者

 <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>

server:
  port: 8006


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

@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();
    }
}
 
 

新建服务消费者：pom，yml文件同上

 建立远程访问配置项

@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.注册中心异同点

3.1CAP理论：

C:Consistency(强一致性)；

P:Partition tolerance(分区容错)；

A:Availability(可用性)

3.2经典的CAP

AP架构（Eureka）：当网络分区出现后，为了保证可用性，系统B可以返回旧的值，保证了系统的可用性，但是无法满足强一致性

 CP架构（zookeeper和Consul）

当网络出现分区后，为了保证一致性，必须拒接请求，这样就可以满足一致性和分区容错