Eureka Eureka Server online combat -1 [expansion]

Others 2019-10-03 19:08:50 views: null

1, ready to work

PS: In order to be lazy, pom each file must rely on the public relies on the following configuration:

<parent>
   <groupId>org.springframework.boot</groupId>
   <artifactId>spring-boot-starter-parent</artifactId>
   <version>2.0.3.RELEASE</version>
   <relativePath/> 
</parent>

<properties>
   <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
   <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
   <java.version>1.8</java.version>
   <spring-cloud.version>Finchley.RELEASE</spring-cloud.version>
</properties>

<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>

 

1.1, due to the need to dynamically modify the configuration, there is need to create a config-server project, pom-dependent as follows:

<! - plus arranged above common dependency ->
<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
        </dependency>
</dependencies>　　
<build>
    <plugins>
        <plugin>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-maven-plugin</artifactId>
        </plugin>
    </plugins>
</build>

 

1.2, config-server project to start classes as follows:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;

/**
 * 程序入口
 */
@SpringBootApplication
@EnableConfigServer
public class ConfigServerApplication {

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

 

1.3, add a project profile, resource path: config-server \ src \ main \ resources \ bootstrap.yml

spring:
  application:
    name: config-server
  profiles:
    active: native
server:
  port: 8888

Here if you do not understand the differences between files bootstrap.yml / properties and application.yml / properties of recommended here look at this article: https://blog.csdn.net/ThinkWon/article/details/100007093

For demonstration effect, where the use of native profile, that is, use to store configuration files, default storage location is resources \ config directory. In addition, to demonstrate the dynamic expansion eureka server, you also need to create a eureka-server project and eureka-client project.

 

1.4, eureka-server project, pom configuration is as follows:

<! - plus arranged above common dependency ->
<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
</dependencies>

<build>
       <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
       </plugins>
</build>

 

1.4.1, eureka-server project started categories:

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaServerApplication {

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

 

1.4.2, eureka-server project configuration file, path: eureka-server \ src \ main \ resources \ bootstrap.yml, eureka-server \ src \ main \ resources \ application.yml

bootstrap.yml:

spring:
  application:
    name: eureka-server
  cloud:
    config:
      uri: http://localhost:8888
management:
  endpoints:
    web:
      exposure:
        include: '*'

application.yml:

Eureka: 
  Server: 
    Use the peer -eureka-Nodes-Update-interval The MS-: 10000 # 600000 default is 10 minutes, 10 seconds in order to verify to here, 
# peerUpdateTask specified scheduled time interval for refreshing the configuration file from the node peerEurekaNodes configuration information

 

1.5, eureka-client project, pom file configuration is as follows:

<! - plus arranged above common dependency ->
<dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
        </dependency>
</dependencies>

<build>
       <plugins>
            <plugin>
                <groupId>org.springframework.boot</groupId>
                <artifactId>spring-boot-maven-plugin</artifactId>
            </plugin>
       </plugins>
</build>

 

1.5.1, eureka-client project started categories:

import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;
import org.springframework.cloud.netflix.eureka.EurekaClientConfigBean;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

@RestController
@RequestMapping("/query")
@SpringBootApplication
@EnableDiscoveryClient
public class EurekaClientApplication {

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

    @Autowired
    private EurekaClientConfigBean eurekaClientConfigBean;

    @GetMapping("/eureka-server")
    public Object getEurekaServerUrl() {
        return eurekaClientConfigBean.getServiceUrl();
    }
}

 

1.5.2, eureka-client project configuration file, path: eureka-client \ src \ main \ resources \ bootstrap.yml, eureka-client \ src \ main \ resources \ application.yml

bootstrap.yml:

spring:
  application:
    name: eureka-client
  cloud:
    config:
      uri: http://localhost:8888
management:
  endpoints:
    web:
      exposure:
        include: '*'

application.yml:

Eureka: 
  Client: 
    Eureka -service-poll-interval The URL-seconds The-: 10 # default is 300 seconds, where 10 seconds in order to verify to

 

2, add the config-server configuration file

2.1, adding eureka-client configuration file, path: config-server \ src \ main \ resources \ config \ eureka-client.yml

server:
  port: 8081

spring:
  application:
    name: eureka-client1

eureka:
  client:
    serviceUrl:
#      defaultZone: http://localhost:8761/eureka/ # one eureka server
#      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/ # two eureka server
      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/,http://localhost:8763/eureka/ # three eureka server

 

2.2、添加eureka-server配置文件，路径：config-server\src\main\resources\config\eureka-server-peer1.yml，config-server\src\main\resources\config\eureka-server-peer2yml，config-server\src\main\resources\config\eureka-server-peer3.yml

config-server\src\main\resources\config\eureka-server-peer1.yml：

server:
  port: 8761

spring:
  application:
    name: eureka-server
eureka:
  instance:
    hostname: localhost
    preferIpAddress: true
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
#      defaultZone: http://localhost:8761/eureka/ # one eureka server
#      defaultZone: http://localhost:8762/eureka/ # two eureka server
      defaultZone: http://localhost:8762/eureka/,http://localhost:8763/eureka/ # three eureka server
  server:
      waitTimeInMsWhenSyncEmpty: 0
      enableSelfPreservation: false

config-server\src\main\resources\config\eureka-server-peer2.yml：

server:
  port: 8762

eureka:
  instance:
    hostname: localhost
    preferIpAddress: true
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
#      defaultZone: http://localhost:8761/eureka/ # two eureka server
      defaultZone: http://localhost:8761/eureka/,http://localhost:8763/eureka/ # three eureka server
  server:
      waitTimeInMsWhenSyncEmpty: 0
      enableSelfPreservation: false

config-server\src\main\resources\config\eureka-server-peer3.yml：

server:
  port: 8763

eureka:
  instance:
    hostname: localhost
    preferIpAddress: true
  client:
    registerWithEureka: true
    fetchRegistry: true
    serviceUrl:
      defaultZone: http://localhost:8761/eureka/,http://localhost:8762/eureka/ # three eureka server
  server:
      waitTimeInMsWhenSyncEmpty: 0
      enableSelfPreservation: false

As can be seen from the configuration file, eureka-server instance of a total of three, are registered with each other twenty-two, 1-2,2-3,1-3.

 

3. Start project

Start each project: config-server, eureka-server, eureka-client.

Start config-server command:

　　mvn spring-boot:run

Start eureka-server command:

　　mvn spring-boot:run -Dspring.profiles.active=peer1

　　mvn spring-boot:run -Dspring.profiles.active=peer2

　　mvn spring-boot:run -Dspring.profiles.active=peer3

According to the start time profiles will complain

2019-10-03 17:10:07.519 ERROR 15853 --- [           main] com.netflix.discovery.DiscoveryClient    : DiscoveryClient_EUREKA-SERVER/10.2.240.30:eureka-server:8761 - was unable to refresh its cache! status = Cannot execute request on any known server

com.netflix.discovery.shared.transport.TransportException: Cannot execute request on any known server
    at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:112) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$6.execute(EurekaHttpClientDecorator.java:137) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.getApplications(EurekaHttpClientDecorator.java:134) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.DiscoveryClient.getAndStoreFullRegistry(DiscoveryClient.java:1051) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.DiscoveryClient.fetchRegistry(DiscoveryClient.java:965) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:414) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.DiscoveryClient.<init>(DiscoveryClient.java:269) [eureka-client-1.9.2.jar:1.9.2]
    at org.springframework.cloud.netflix.eureka.CloudEurekaClient.<init>(CloudEurekaClient.java:63) [spring-cloud-netflix-eureka-client-2.0.0.RELEASE.jar:2.0.0.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration.eurekaClient(EurekaClientAutoConfiguration.java:269) [spring-cloud-netflix-eureka-client-2.0.0.RELEASE.jar:2.0.0.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$ee9298f0.CGLIB$eurekaClient$0(<generated>) [spring-cloud-netflix-eureka-client-2.0.0.RELEASE.jar:2.0.0.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$ee9298f0$$FastClassBySpringCGLIB$$c9690964.invoke(<generated>) [spring-cloud-netflix-eureka-client-2.0.0.RELEASE.jar:2.0.0.RELEASE]
    at org.springframework.cglib.proxy.MethodProxy.invokeSuper(MethodProxy.java:228) [spring-core-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.context.annotation.ConfigurationClassEnhancer$BeanMethodInterceptor.intercept(ConfigurationClassEnhancer.java:361) [spring-context-5.0.7.RELEASE.jar:5.0.7.RELEASE]
    at org.springframework.cloud.netflix.eureka.EurekaClientAutoConfiguration$RefreshableEurekaClientConfiguration$$EnhancerBySpringCGLIB$$ee9298f0.eurekaClient(<generated>) [spring-cloud-netflix-eureka-client-2.0.0.RELEASE.jar:2.0.0.RELEASE]

2019-10-03 17:10:12.759 ERROR 15853 --- [nfoReplicator-0] c.n.d.s.t.d.RedirectingEurekaHttpClient  : Request execution error

com.sun.jersey.api.client.ClientHandlerException: java.net.ConnectException: Connection refused (Connection refused)
    at com.sun.jersey.client.apache4.ApacheHttpClient4Handler.handle(ApacheHttpClient4Handler.java:187) ~[jersey-apache-client4-1.19.1.jar:1.19.1]
    at com.sun.jersey.api.client.filter.GZIPContentEncodingFilter.handle(GZIPContentEncodingFilter.java:123) ~[jersey-client-1.19.1.jar:1.19.1]
    at com.netflix.discovery.EurekaIdentityHeaderFilter.handle(EurekaIdentityHeaderFilter.java:27) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.sun.jersey.api.client.Client.handle(Client.java:652) ~[jersey-client-1.19.1.jar:1.19.1]
    at com.sun.jersey.api.client.WebResource.handle(WebResource.java:682) ~[jersey-client-1.19.1.jar:1.19.1]
    at com.sun.jersey.api.client.WebResource.access$200(WebResource.java:74) ~[jersey-client-1.19.1.jar:1.19.1]
    at com.sun.jersey.api.client.WebResource$Builder.post(WebResource.java:570) ~[jersey-client-1.19.1.jar:1.19.1]
    at com.netflix.discovery.shared.transport.jersey.AbstractJerseyEurekaHttpClient.register(AbstractJerseyEurekaHttpClient.java:56) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.MetricsCollectingEurekaHttpClient.execute(MetricsCollectingEurekaHttpClient.java:73) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.executeOnNewServer(RedirectingEurekaHttpClient.java:118) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.RedirectingEurekaHttpClient.execute(RedirectingEurekaHttpClient.java:79) ~[eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.RetryableEurekaHttpClient.execute(RetryableEurekaHttpClient.java:120) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator$1.execute(EurekaHttpClientDecorator.java:59) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.SessionedEurekaHttpClient.execute(SessionedEurekaHttpClient.java:77) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.shared.transport.decorator.EurekaHttpClientDecorator.register(EurekaHttpClientDecorator.java:56) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.DiscoveryClient.register(DiscoveryClient.java:829) [eureka-client-1.9.2.jar:1.9.2]
    at com.netflix.discovery.InstanceInfoReplicator.run(InstanceInfoReplicator.java:121) [eureka-client-1.9.2.jar:1.9.2]
    at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) [na:1.8.0_151]
    at java.util.concurrent.FutureTask.run(FutureTask.java:266) [na:1.8.0_151]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:180) [na:1.8.0_151]
    at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:293) [na:1.8.0_151]
    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149) [na:1.8.0_151]
    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624) [na:1.8.0_151]
    at java.lang.Thread.run(Thread.java:748) [na:1.8.0_151]

This is because here in order to facilitate subsequent demonstration expansion, the property is set to true peer1 sake of fetchRegistry and fetchRegistry, if it is a standalone eureka server, do not want to see this error, you can set your own is false.

Access: localhost: 8761

It can be seen at this time have three eureka-server instance.

Start eureka-client command:

　　mvn spring-boot:run

Access: localhost: 8081 / query / eureka-server /

 You can see, is to get three server instances, in order to facilitate used here is native of profile, if you have modified file, need to restart to take effect, if you are using or git repository GitHub repository, you do not need to restart the config-server. 

 

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Origin www.cnblogs.com/idoljames/p/11620140.html
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