Eureka集群搭建
Posted xmf3628
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1、Eureka集群搭建
2、Eureka自我保护机制
Eureka集群搭建
高可用集群配置
当注册中心扛不住高并发的时候,这时候 要用集群来扛;
普通操作
我们再新建两个module microservice-eureka-server-2002 microservice-eureka-server-2003
pom.xml 把依赖加下
<dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- 修改后立即生效,热部署 --> <dependency> <groupId>org.springframework</groupId> <artifactId>springloaded</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> </dependency> </dependencies>
2、2002 2003的主启动类EurekaServerApplication_2002,EurekaServerApplication_2003复制修改下;
package com.hmc.microserviceeurekaserver2002;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@EnableEurekaServer
@SpringBootApplication
public class MicroserviceEurekaServer2002Application {
public static void main(String[] args) {
SpringApplication.run(MicroserviceEurekaServer2002Application.class, args);
}
}
3、前面单机的时候 eureka注册中心实例名称 是localhost,现在是集群,不能三个实例都是localhost,这里复杂的办法是搞三个虚拟机,麻烦,这里有简单办法,直接配置本机hosts,来实现本机域名映射;
找到 C:WindowsSystem32driversetc 打开hosts,加配置
127.0.0.1 eureka2001.hmc.com
127.0.0.1 eureka2002.hmc.com
127.0.0.1 eureka2003.hmc.com
4、修改三个项目的application.yml文件,主要是修改 hostname和defaultZone,
2001修改:
server:
port: 2001
context-path: /
eureka:
instance:
# 单机 hostname: localhost #eureka注册中心实例名称
hostname: eureka2001.hmc.com # 集群
client:
register-with-eureka: false #false 由于该应用为注册中心,所以设置为false,代表不向注册中心注册自己。
service-url:
defaultZone: http://eureka2002.hmc.com:2002/eureka/,http://eureka2003.hmc.com:2003/eureka/ # 集群
#单机defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ #设置与Eureka注册中心交互的地址,查询服务和注册服务用到
2002修改:
server:
port: 2002
context-path: /
eureka:
instance:
# u5355u673A hostname: localhost #eurekau6CE8u518Cu4E2Du5FC3u5B9Eu4F8Bu540Du79F0
hostname: eureka2002.hmc.com # u96C6u7FA4
client:
register-with-eureka: false #false u7531u4E8Eu8BE5u5E94u7528u4E3Au6CE8u518Cu4E2Du5FC3uFF0Cu6240u4EE5u8BBEu7F6Eu4E3Afalse,u4EE3u8868u4E0Du5411u6CE8u518Cu4E2Du5FC3u6CE8u518Cu81EAu5DF1u3002
service-url:
defaultZone: http://eureka2001.hmc.com:2001/eureka/,http://eureka2003.hmc.com:2003/eureka/ # u96C6u7FA4
#u5355u673AdefaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ #u8BBEu7F6Eu4E0EEurekau6CE8u518Cu4E2Du5FC3u4EA4u4E92u7684u5730u5740uFF0Cu67E5u8BE2u670Du52A1u548Cu6CE8u518Cu670Du52A1u7528u5230
2003修改:
server:
port: 2003
context-path: /
eureka:
instance:
# u5355u673A hostname: localhost #eurekau6CE8u518Cu4E2Du5FC3u5B9Eu4F8Bu540Du79F0
hostname: eureka2003.hmc.com # u96C6u7FA4
client:
register-with-eureka: false #false u7531u4E8Eu8BE5u5E94u7528u4E3Au6CE8u518Cu4E2Du5FC3uFF0Cu6240u4EE5u8BBEu7F6Eu4E3Afalse,u4EE3u8868u4E0Du5411u6CE8u518Cu4E2Du5FC3u6CE8u518Cu81EAu5DF1u3002
service-url:
defaultZone: http://eureka2001.hmc.com:2001/eureka/,http://eureka2002.hmc.com:2002/eureka/ # u96C6u7FA4
#u5355u673AdefaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ #u8BBEu7F6Eu4E0EEurekau6CE8u518Cu4E2Du5FC3u4EA4u4E92u7684u5730u5740uFF0Cu67E5u8BE2u670Du52A1u548Cu6CE8u518Cu670Du52A1u7528u5230
5、修改服务提供者项目的application.yml,主要修改eureka.client.service-url.defaultZone
eureka:
instance:
hostname: localhost #eureka客户端主机实例名称
appname: microservice-student #客户端服务名
instance-id: microservice-student:1001 #客户端实例名称
prefer-ip-address: true #显示IP
client:
service-url:
defaultZone: http://localhost:2001/eureka #把服务注册到eureka注册中心
最后我们测试下:
启动三个注册中心,以及服务提供者项目;
上面eureka服务搭建,除了yml文件不一样,其他文件都一样,那么我们有什么办法能够将多个eureka服务集合到一个工程中去呢?
创建一个microservice-eureka-server(三合一)子工程
Pom依赖
<?xml version="1.0" encoding="UTF-8"?> <project xmlns="http://maven.apache.org/POM/4.0.0" xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" xsi:schemaLocation="http://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd"> <modelVersion>4.0.0</modelVersion> <parent> <groupId>com.hmc</groupId> <artifactId>springcloud</artifactId> <version>1.0-SNAPSHOT</version> </parent> <artifactId>microservice-eureka-server</artifactId> <properties> <java.version>1.8</java.version> </properties> <dependencies> <dependency> <groupId>org.springframework.cloud</groupId> <artifactId>spring-cloud-starter-eureka-server</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-test</artifactId> <scope>test</scope> </dependency> <!-- 修改后立即生效,热部署 --> <dependency> <groupId>org.springframework</groupId> <artifactId>springloaded</artifactId> </dependency> <dependency> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-devtools</artifactId> </dependency> </dependencies> <build> <plugins> <plugin> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-maven-plugin</artifactId> </plugin> </plugins> </build> </project>
Yml文件
---
server:
port: 2001
context-path: /
eureka:
instance:
hostname: eureka2001.hmc.com
client:
register-with-eureka: false
service-url:
defaultZone: http://eureka2002.hmc.com:2002/eureka/,http://eureka2003.hmc.com:2003/eureka/
spring:
profiles: eureka2001
---
server:
port: 2002
context-path: /
eureka:
instance:
hostname: eureka2002.hmc.com
client:
register-with-eureka: false
service-url:
defaultZone: http://eureka2001.hmc.com:2001/eureka/,http://eureka2003.hmc.com:2003/eureka/
spring:
profiles: eureka2002
---
server:
port: 2003
context-path: /
eureka:
instance:
hostname: eureka2003.hmc.com
client:
register-with-eureka: false
service-url:
defaultZone: http://eureka2001.hmc.com:2001/eureka/,http://eureka2002.hmc.com:2002/eureka/
spring:
profiles: eureka2003
启动类MicroserviceEurekaServerApplication.java
package com.hmc.microserviceeurekaserver;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
@EnableEurekaServer
@SpringBootApplication
public class MicroserviceEurekaServerApplication {
public static void main(String[] args) {
SpringApplication.run(MicroserviceEurekaServerApplication.class, args);
}
}
Eureka自我保护机制
开发环境,我们经常会遇到这个红色的警告;
当我们长时间为访问服务以及变更服务实例名称的时候,就会出现这个红色警告;
默认情况,如果服务注册中心再一段时间内没有接收到某个微服务实例的心跳,服务注册中心会注销该实例(默认90秒)。
由于正式环境,经常会有网络故障,网络延迟问题发生,服务和注册中心无法正常通信,此时服务是正常的,不应该注销该服务,Eureka这时候,就通过“自我保护模式”来解决问题,当短时间和服务失去通信时,保留服务信息,当恢复网络和通信时候,退出“自我保护模式”;
通过“自我保护模式”,使Eureka集群更加的健壮和稳定;
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