Eureka實戰-1【Eureka Server線上擴容】

来源:https://www.cnblogs.com/idoljames/archive/2019/10/03/11620140.html
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1、準備工作 PS:為了偷懶,每個pom文件都要依賴的公共依賴配置放在下麵: 1.1、由於需要動態修改配置,這裡需要創建config-server工程,pom依賴如下: 1.2、config-server工程啟動類如下: 1.3、添加項目配置文件,資源路徑:config-server\src\mai ...


1、準備工作

PS:為了偷懶,每個pom文件都要依賴的公共依賴配置放在下麵:

<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、由於需要動態修改配置,這裡需要創建config-server工程,pom依賴如下:

<!-- 加上上面的公共依賴配置 -->
<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工程啟動類如下:

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

/**
 * 程式入口
 */
@SpringBootApplication
@EnableConfigServer
public class ConfigServerApplication {

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

 

1.3、添加項目配置文件,資源路徑:config-server\src\main\resources\bootstrap.yml

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

這裡如果不明白bootstrap.yml/properties與application.yml/properties的文件區別,這裡推薦看一下這篇文章:https://blog.csdn.net/ThinkWon/article/details/100007093

為了便於演示效果,這裡使用native的profile,即使用文件來存儲配置,預設存放位置是resources\config目錄下。另外為了演示eureka server的動態擴容,還需要創建eureka-server工程和eureka-client工程。

 

1.4、eureka-server工程,pom配置如下:

<!-- 加上上面的公共依賴配置 -->
<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工程啟動類:

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工程配置文件,路徑: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:
    peer-eureka-nodes-update-interval-ms: 10000 #預設是10分鐘即600000,這裡為了驗證改為10秒,
#    指定peerUpdateTask調度的時間間隔,用於從配置文件刷新peerEurekaNodes節點的配置信息

 

1.5、eureka-client工程,pom文件配置如下:

<!-- 加上上面的公共依賴配置 -->
<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工程啟動類:

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工程配置文件,路徑: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-url-poll-interval-seconds: 10 #預設為300秒,這裡為了驗證改為10秒

 

2、添加config-server配置文件

2.1、添加eureka-client配置文件,路徑: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,路徑: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

從配置文件可以看出,eureka-server一共有三個實例,都是兩兩互相註冊,1-2、2-3、1-3。

 

3、啟動工程

分別啟動工程:config-server,eureka-server,eureka-client。

啟動config-server命令:

  mvn spring-boot:run

啟動eureka-server命令:

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

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

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

按照profiles啟動的時候會報錯

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]

這是因為這裡為了後續演示擴容方便,peer1的fetchRegistry及fetchRegistry的屬性設置為true的緣故,如果是standalone的eureka server,不想看到這個錯誤,可以自行設置為false。

訪問:localhost:8761

可以看到,此時eureka-server已經有了三個實例。

啟動eureka-client命令:

  mvn spring-boot:run

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

 可以看到,得到是三個server實例,為了方便這裡使用的是native的profile,如果有修改文件,需要重啟後才能生效,如果使用的是git倉庫或者是GitHub倉庫,則無需重啟config-server。 

 


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  • 1.前言 什麼是熱更新 游戲或者軟體更新時,無需重新下載客戶端進行安裝,而是在應用程式啟動的情況下,在內部進行資源或者代碼更新 Unity目前常用熱更新解決方案 HybridCLR,Xlua,ILRuntime等 Unity目前常用資源管理解決方案 AssetBundles,Addressable, ...
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