微服务架构eureka集群高可用配置

工具：idea

环境：java8、maven3

版本：spring boot 1.5.15.RELEASE

1.搭建spring boot eureka项目

2. pom.xml添加相应依赖，如下：

<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
    <modelVersion>4.0.0</modelVersion>

    <groupId>webapp</groupId>
    <artifactId>eureka</artifactId>
    <version>0.0.1-SNAPSHOT</version>
    <packaging>jar</packaging>

    <name>eureka</name>
    <description>Demo project for Spring Boot</description>

    <parent>
        <groupId>org.springframework.boot</groupId>
        <artifactId>spring-boot-starter-parent</artifactId>
        <version>1.5.15.RELEASE</version>
        <relativePath/> <!-- lookup parent from repository -->
    </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>Edgware.SR4</spring-cloud.version>
    </properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-eureka-server</artifactId>
        </dependency>
        <dependency>
            <groupId>org.projectlombok</groupId>
            <artifactId>lombok</artifactId>
            <optional>true</optional>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-security</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-test</artifactId>
            <scope>test</scope>
        </dependency>
    </dependencies>

    <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>

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

</project>

3.修改配置文件后缀为yml，application.yml内容如下：

spring:
  application:
    name: eureka-server
security:
  user:
    name: admin
    password: 123456
eureka:
  p1:
    hostname: server1
    port: 1111
  p2:
    hostname: server2
    port: 1112
  p3:
    hostname: server3
    port: 1113

4. 新建application-peer1.yml、application-peer2.yml、application-peer3.yml

application-peer1.yml：

server:
  port: 1111
eureka:
  instance:
    hostname: ${eureka.p1.hostname}
  client:
    service-url:
      defaultZone: http://${security.user.name}:${security.user.password}@${eureka.p2.hostname}:${eureka.p2.port}/eureka/,http://${security.user.name}:${security.user.password}@${eureka.p3.hostname}:${eureka.p3.port}/eureka/

application-peer2.yml：

server:
  port: 1112
eureka:
  instance:
    hostname: ${eureka.p2.hostname}
  client:
    service-url:
      defaultZone: http://${security.user.name}:${security.user.password}@${eureka.p1.hostname}:${eureka.p1.port}/eureka/,http://${security.user.name}:${security.user.password}@${eureka.p3.hostname}:${eureka.p3.port}/eureka/

application-peer3.yml：

server:
  port: 1113
eureka:
  instance:
    hostname: ${eureka.p3.hostname}
  client:
    service-url:
      defaultZone: http://${security.user.name}:${security.user.password}@${eureka.p1.hostname}:${eureka.p1.port}/eureka/,http://${security.user.name}:${security.user.password}@${eureka.p2.hostname}:${eureka.p2.port}/eureka/

service-url这里是重点，我将server1的service-url设置为server2、server3，将server2的设置为server1、server3，将server3的设置为server1、server2。以此完成3个server服务间的相互注册 。

4. 本地模拟域名配置：

由于我们使用了http://server1这种写法，需要配一下host:

5. 启动类配置@EnableEurekaServer：

package webapp;

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

@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {

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

6. 分别配置和启动3个eureka服务

peer2和peer3类似以上设置，最后如下：

7.分别启动3个服务

8.分别访问各自的端口

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可以看到图上registered-replicas和available-replicas分别有了对方的地址。

eureka服务端的配置就这样就OK了。