Eureka集群

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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

1、pom.xml 把依赖加下；

<?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.</modelVersion>
<parent>
<groupId>com.jt</groupId>
<artifactId>microservice</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>

<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>

2、2002 2003的主启动类EurekaServerApplication_2002，EurekaServerApplication_2003复制修改下；

package com.jt.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:\Windows\System32\drivers\etc 打开hosts，加配置

127.0.0.1 eureka2001.jt.com
127.0.0.1 eureka2002.jt.com
127.0.0.1 eureka2003.jt.com

修改三个项目的application.yml文件，主要是修改 hostname和defaultZone，

2001修改：

server:
port:
context-path: /eureka:
instance:
hostname: eureka2001.jt.com
client:
register-with-eureka: false
service-url:
defaultZone: http://eureka2002.jt.com:2002/eureka/,http://eureka2003.jt.com:2003/eureka/ # 集群

2002

server:
port:
context-path: /eureka:
instance:
hostname: eureka2002.jt.com
client:
register-with-eureka: false
service-url:
defaultZone: http://eureka2001.jt.com:2001/eureka/,http://eureka2003.jt.com:2003/eureka/

2003

server:
port:
context-path: /eureka:
instance:
hostname: eureka2003.jt.com
client:
register-with-eureka: false
service-url:
defaultZone: http://eureka2001.jt.com:2001/eureka/,http://eureka2002.jt.com:2002/eureka/

骚操作

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.</modelVersion>
<parent>
<groupId>com.jt</groupId>
<artifactId>microservice</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>

<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:
context-path: /
eureka:
instance:
hostname: eureka2001.jt.com
client:
register-with-eureka: false
fetch-registry: false
service-url:
defaultZone: http://eureka2002.jt.com:2002/eureka/,http://eureka2003.jt.com:2003/eureka/
spring:
profiles: eureka2001
---
server:
port:
context-path: /
eureka:
instance:
hostname: eureka2002.jt.com
client:
register-with-eureka: false
fetch-registry: false
service-url:
defaultZone: http://eureka2001.jt.com:2001/eureka/,http://eureka2003.jt.com:2003/eureka/
spring:
profiles: eureka2002
---
server:
port:
context-path: /
eureka:
instance:
hostname: eureka2003.jt.com
client:
register-with-eureka: false
fetch-registry: false
service-url:
defaultZone: http://eureka2001.jt.com:2001/eureka/,http://eureka2002.jt.com:2002/eureka/
spring:
profiles: eureka2003

启动类MicroserviceEurekaServerApplication.java

package com.jt.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);
}}