SpringCloud service registration and discovery of Eureka (a)

The basic architecture of a Eureka

Spring Cloud encapsulates Netflix Eureka module developed to implement the service registration and discovery (please compare Zookeeper).

Eureka using the CS design architecture. Eureka Server as a service registration function of the server, which is a service registry.

And other micro-services system, use the client to connect to Eureka Eureka Server and maintain a heartbeat connection. Such systems maintenance personnel can monitor each micro system service is functioning properly by Eureka Server. SpringCloud some of the other modules (such as Zuul) can be found in other micro-services system through Eureka Server, and implementation of relevant logic.

Two of the three roles in Eureka

    

• Eureka Server service registration and discovery

• Service Provider The service provider will register their services to Eureka, so that the service consumer to find

• Service Consumer service consumer to obtain a list of registered services from Eureka, thereby Consumer Services

Construction of three steps

• Create a eureka-server project

  • pom.xml

  ​
    

   <dependencies>
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-web</artifactId>
          </dependency>
          <dependency>
              <groupId>org.springframework.cloud</groupId>
              <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
          </dependency>
  ​
          <dependency>
              <groupId>org.springframework.boot</groupId>
              <artifactId>spring-boot-starter-test</artifactId>
              <scope>test</scope>
          </dependency>
      </dependencies>
  ​
      <dependencyManagement>
          <dependencies>
              <dependency>
                  <groupId>org.springframework.cloud</groupId>
                  <artifactId>spring-cloud-dependencies</artifactId>
                  <version>${spring-cloud.version}</version>
                  <type>pom</type>
                  <scope>import</scope>
              </dependency>
          </dependencies>
      </dependencyManagement>
  ​
      <build>
          <plugins>
              <plugin>
                  <groupId>org.springframework.boot</groupId>
                  <artifactId>spring-boot-maven-plugin</artifactId>
              </plugin>
          </plugins>
      </build>

   

  • YML

    server:
      port: 8761
    ​
    eureka:
      instance:
        hostname: localhost
      client:
        registerWithEureka: false
        fetchRegistry: false
        serviceUrl:
          defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/

     

  • Startup class

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

     

  • Start results

    

• Create a producer-service

  • pom.xml

     1   <dependencies>
     2         <dependency>
     3             <groupId>org.springframework.boot</groupId>
     4             <artifactId>spring-boot-starter-actuator</artifactId>
     5         </dependency>
     6         <dependency>
     7             <groupId>org.springframework.boot</groupId>
     8             <artifactId>spring-boot-starter-web</artifactId>
     9         </dependency>
    10         <dependency>
    11             <groupId>org.springframework.cloud</groupId>
    12             <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
    13         </dependency>
    14 ​
    15         <dependency>
    16             <groupId>org.springframework.boot</groupId>
    17             <artifactId>spring-boot-starter-test</artifactId>
    18             <scope>test</scope>
    19         </dependency>
    20     </dependencies>
    21 ​
    22     <dependencyManagement>
    23         <dependencies>
    24             <dependency>
    25                 <groupId>org.springframework.cloud</groupId>
    26                 <artifactId>spring-cloud-dependencies</artifactId>
    27                 <version>${spring-cloud.version}</version>
    28                 <type>pom</type>
    29                 <scope>import</scope>
    30             </dependency>
    31         </dependencies>
    32     </dependencyManagement>
    33     <!-- 微服务info内容详细信息 -->
    34     <build>
    35         <finalName>microservicecloud</finalName>
    36         <resources>
    37             <resource>
    38                 <directory>src/main/resources</directory>
    39                 <filtering>true</filtering>
    40             </resource>
    41         </resources>
    42         <plugins>
    43             <plugin>
    44                 <groupId>org.apache.maven.plugins</groupId>
    45                 <artifactId>maven-resources-plugin</artifactId>
    46                 <configuration>
    47                     <delimiters>
    48                         <delimit>$</delimit>
    49                     </delimiters>
    50                 </configuration>
    51             </plugin>
    52         </plugins>
    53     </build>

  • YML

    Eureka: 
      Client: 
        serviceUrl: 
          defaultzone: HTTP: // localhost: 8761 / Eureka / 
      instance:          
        instance -id: product- service8080 # Host Name: The name of the service to modify 
        the prefer -ip-address: to true    # access path to display the IP address of 
    server : 
      Port: 8080 
    the Spring: 
      the Application: 
        name: Product - service 
    # micro-content service info detailed 
    info: 
      the app.name: Product - Servic 
      company.name: www.topcheer.com

     

  • Startup class

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

  • result: