Eureka实战-1【Eureka Server在线扩容】
1、准备工作
PS：为了偷懒，每个pom文件都要依赖的公共依赖配置放在下面：
<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、由于需要动态修改配置，这里需要创建config-server工程，pom依赖如下：
<!-- 加上上面的公共依赖配置 -->
<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工程启动类如下：
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、添加项目配置文件，资源路径：config-server\src\main\resources\bootstrap.yml
spring:
application:
name: config-server
profiles:
active: native
server:
port: 8888
这里如果不明白bootstrap.yml/properties与application.yml/properties的文件区别，这里推荐看一下这篇文章：https://blog.csdn.net/ThinkWon/article/details/100007093
为了便于演示效果，这里使用native的profile，即使用文件来存储配置，默认存放位置是resources\config目录下。另外为了演示eureka server的动态扩容，还需要创建eureka-server工程和eureka-client工程。
1.4、eureka-server工程，pom配置如下：
<!-- 加上上面的公共依赖配置 -->
<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工程启动类：
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，路径：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 #默认是10分钟即600000，这里为了验证改为10秒，
# 指定peerUpdateTask调度的时间间隔，用于从配置文件刷新peerEurekaNodes节点的配置信息
1.5、eureka-client工程，pom文件配置如下：
<!-- 加上上面的公共依赖配置 -->
<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工程启动类：
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，路径：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 #默认为300秒，这里为了验证改为10秒
2、添加config-server配置文件
2.1、添加eureka-client配置文件，路径：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
从配置文件可以看出，eureka-server一共有三个实例，都是两两互相注册，1-2、2-3、1-3。
3、启动工程
分别启动工程：config-server，eureka-server，eureka-client。
启动config-server命令：
mvn spring-boot:run
启动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启动的时候会报错
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]
这是因为这里为了后续演示扩容方便，peer1的fetchRegistry及fetchRegistry的属性设置为true的缘故，如果是standalone的eureka server，不想看到这个错误，可以自行设置为false。
访问：localhost:8761
可以看到，此时eureka-server已经有了三个实例。
启动eureka-client命令：
mvn spring-boot:run
访问：localhost:8081/query/eureka-server/
可以看到，得到是三个server实例，为了方便这里使用的是native的profile，如果有修改文件，需要重启后才能生效，如果使用的是git仓库或者是GitHub仓库，则无需重启config-server。
Eureka实战-1【Eureka Server在线扩容】的更多相关文章
- Eureka Server 实现在线扩容
Eureka Server 实现在线扩容 作者:Grey 原文地址: 博客园:Eureka Server 实现在线扩容 CSDN:Eureka Server 实现在线扩容 需求 Eureka 是 Sp ...
- Eureka 客户端连接Eureka服务端时 报Cannot execute request on any known server 解决办法
报Cannot execute request on any known server 这个错,总的来说就是连接Eureka服务端地址不对. 因为配置eureka.client.serviceUrl. ...
- 动态在线扩容root根分区大小的方法详解
前言 本文主要介绍了关于动态在线扩容root根分区大小的相关内容,分享出来供大家参考学习,下面话不都说了,来一起看看详细的介绍吧. ? 1 qemu-img resize yourname.img + ...
- 第一个Eureka程序，Eureka Client的自启动原理和简要过程
https://blog.csdn.net/u011531425/article/details/81675289 在之前的Spring Cloud Config的基础上,搭建简单的Eureka Se ...
- Linux LVM在线扩容
环境: 虚拟化环境,SUSE Linux Enterprise Server 11sp3,直接把虚拟磁盘从100G改成150G. 现有的LVM是100G,/home 的LV需要再加50G. 步骤: f ...
- Eureka -- 浅谈Eureka
目录: 一:Eureka介绍 二:Eureka架构图 三:Eureka组件 四:Eureka作用 五:Eureka和Zookeeper对比 什么是Eureka 引入SpringCloud中文文档介绍 ...
- Springboot搭建Eureka并设置Eureka登录账号密码
Springboot搭建Eureka并设置Eureka登录账号密码 一.创建一个springboot项目 1.可以使用Spring Initializr,用浏览器打开http://start.spri ...
- KingbaseES R3 读写分离集群在线扩容案例
案例说明: 1. 通过sys_basebackup创建新备库. 2. 将备库加入到Cluster nodes管理,可以用kingbase_monitor.sh一键启停. 3. 主备复制切换测试. 此次 ...
- LVM在线扩容
我虚拟机根分区已经使用了35%,现在需要对他进行在线扩容,扩容之后使用率降到30% [root@localhost ~]# dfFilesystem 1K-blocks Used Available ...
随机推荐
- Java多线程之线程协作
Java多线程之线程协作 一.前言 上一节提到,如果有一个线程正在运行synchronized 方法,那么其他线程就无法再运行这个方法了.这就是简单的互斥处理. 假如我们现在想执行更加精确的控制,而不 ...
- 分布式任务调度框架 Azkaban —— Flow 2.0 的使用
一.Flow 2.0 简介 1.1 Flow 2.0 的产生 Azkaban 目前同时支持 Flow 1.0 和 Flow2.0 ,但是官方文档上更推荐使用 Flow 2.0,因为 Flow 1.0 ...
- “adobe premiere中画面和声音不同步” 解决方法
一.背景 之前在segmentfault上过直播课,直播课有录制回播功能:尝试听了下直播课,发现视频太长了,感觉听起来非常花费学员的时间,在回放中其实有一些直播课里面的内容并不需要,所以准备剪辑一下, ...
- IdentityServer3学习记录（搭建IdentityServer项目）
记录下自己尝试搭建identityServer3的过程,便于自己记录遗忘时翻看,也能便于刚接触的新手简单了解下搭建的过程. 更详细的可以参考 https://www.jianshu.com/p/792 ...
- HDU 5126 stars 4维偏序， CDQ套CDQ
题目传送门 题意:在一个星空中,按着时间会出现一些点,现在john想知道,在某个时间内有多少个星星是的坐标是满足条件的.(x1<=x<=x2, y1 <= y <= y2, z ...
- CodeForces 1082 G Petya and Graph 最大权闭合子图。
题目传送门 题意:现在有一个图,选择一条边,会把边的2个顶点也选起来,最后会的到一个边的集合 和一个点的集合 , 求边的集合 - 点的集合最大是多少. 题解:裸的最大权闭合子图. 代码: #inclu ...
- 牛客小白月赛4 C 病菌感染 dfs
链接:https://www.nowcoder.com/acm/contest/134/C来源:牛客网 题目描述 铁子和顺溜上生物课的时候不小心将几滴超级病菌滴到了培养皿上,这可急坏了他们. 培养皿可 ...
- Requests库整理
一.Requests库的安装 win平台下,直接在命令行使用 pip install requests 即可进行安装 成功后测试如下 >>> import requests > ...
- C#开发BIMFACE系列25 服务端API之获取模型数据10：获取楼层对应面积分区列表
系列目录 [已更新最新开发文章,点击查看详细] 在<C#开发BIMFACE系列22 服务端API之获取模型数据7:获取多个模型的楼层信息>中,返回的楼层信息结果中包含了楼层的具体信 ...
- Linux基础提高_系统性能相关命令
w 看系统的负载信息 用于显示已经登陆系统的用户列表,并显示用户正在执行的指令 uptime [root@localhost]#uptime 17:26:07 up 9:02, 3 users, lo ...