SpringCloud开发之路——服务注册与发现之Consul

由于eureka官方已经正式宣布：自2.0起不再维护该项目。https://github.com/Netflix/eureka
所以这里使用Consul 代码Eureka

Consule安装-单机部署：

• 注意这里使用docker 直接运行的，如果不熟悉的请阅读如下文章快速入门
  Centos 7 下安装Docker
  Docker 常用操作
• 使用docker 安装可以统计管理软件，不用把自己的电脑搞得亂七八糟

1.摘取镜像及安装

# 检索镜像
docker search consul
docker pull consule
# 查看镜像
docker images
# 安装
docker run --name consul -p 8500:8500 -v $PWD/data/:/consul/data/ -v$PWD/config:/consul/config -d consul

Consule安装-集群部署：

mkdir /data/docker/consul
touch docker-compose.yml
vim docker-compose.yml

加入如下内容：

version: '3.6'
services:
  consul1:
    image: consul:1.3.0
    container_name: consul1
    restart: always
    network_mode: mynet
    command: agent -server -client=0.0.0.0 -bootstrap-expect=3 -node=consul1 
  consul2:
    image: consul:1.3.0
    container_name: consul2
    network_mode: mynet
    restart: always
    command: agent -server -client=0.0.0.0 -retry-join=consul1 -node=consul2
  consul3:
    image: consul:1.3.0
    container_name: consul3
    network_mode: mynet
    restart: always
    command: agent -server -client=0.0.0.0 -retry-join=consul1 -node=consul3
  consul4:
    image: consul:1.3.0
    container_name: consul4
    network_mode: mynet
    restart: always
    ports:
      - 8500:8500
    command: agent -client=0.0.0.0 -retry-join=consul1 -ui -node=client1

启动：

docker-compose up -d

创建maven工程

结构如下
spring-cloud-consul-parent
----provider
----consumer

image.png

parent pom.xml

    
        org.springframework.boot
        spring-boot-starter-parent
        2.0.6.RELEASE
         
    

    
        UTF-8
        UTF-8
        1.8
        Finchley.SR1
    
    
    
        
            
                org.springframework.cloud
                spring-cloud-dependencies
                ${spring-cloud.version}
                pom
                import
            
        
    

provider相关配置

• pom.xml文件

    
        
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.boot
            spring-boot-starter-actuator
        

        
            org.springframework.boot
            spring-boot-actuator
        
        
            org.springframework.boot
            spring-boot-configuration-processor
        
        
        
            org.springframework.cloud
            spring-cloud-starter-consul-discovery
        
        
        
            org.springframework.cloud
            spring-cloud-starter-consul-config
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.projectlombok
            lombok
            1.18.6
        
    

• application.yml 文件

server:
  port: 9201

• bootstrap.yml 文件

spring:
  application:
    name: springtest-service
  cloud:
    consul:
      host: 192.168.199.214
      port: 8500
      discovery:
        register: true
        hostname: 192.168.199.140
        serviceName: ${spring.application.name}
        port: ${server.port}
        healthCheckPath: /home
        healthCheckInterval: 15s
        tags: urlprefix-/${spring.application.name}
        instanceId: ${spring.application.name}

• SpringtestServiceApplication 文件

@EnableDiscoveryClient
@RestController
@SpringBootApplication
public class SpringtestServiceApplication {

    public static void main(String[] args) {
        SpringApplication.run(SpringtestServiceApplication.class, args);
    }

    @GetMapping("/home")
    public String home() {
        return "Hello World";
    }

    @GetMapping("/test")
    public String test(@RequestParam(value = "id") Integer id) {
        return "test" + id;
    }
}

consumer 相关配置

• pom.xml

    
      
            org.springframework.boot
            spring-boot-starter-web
        
        
            org.springframework.cloud
            spring-cloud-starter-consul-discovery
        
        
            org.springframework.cloud
            spring-cloud-start
        
        
            org.springframework.boot
            spring-boot-starter-test
            test
        
        
            org.springframework.cloud
            spring-cloud-starter-openfeign
        
        
            org.springframework.cloud
            spring-cloud-starter-netflix-hystrix
        
    

• application.yml

server:
  port: 9202

spring:
  application:
    name: springtest-client
  cloud:
    consul:
      host: 192.168.199.214
      port: 8500
      discovery:
        register: false

• MyFeignClient

@FeignClient(name = "springtest-service", fallback = HystrixFeignFallback.class)
public interface MyFeignClient {

    @GetMapping("/home")
    String home();

    @GetMapping("/test")
    String test(@RequestParam("id") Integer id);
}

• HystrixFeignFallback

public class HystrixFeignFallback implements MyFeignClient {
    @Override
    public String home() {
        return "home failure";
    }

    @Override
    public String test(Integer id) {
        return "test failure "+id;
    }
}

• SpringtestClientApplication

@EnableDiscoveryClient
@RestController
@SpringBootApplication
@EnableFeignClients
public class SpringtestClientApplication {

    @Autowired
    private MyFeignClient myFeignClient;

    public static void main(String[] args) {
        SpringApplication.run(SpringtestClientApplication.class, args);
    }

    /**
     * 调用test
     *
     * @param id
     * @return
     */
    @GetMapping("/test")
    public String test(@RequestParam Integer id) {
        return myFeignClient.test(id);
    }

    /**
     * 调用home
     *
     * @return
     */
    @GetMapping("/home")
    public String home() {
        return myFeignClient.home();
    }
}