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springcloud eureka注册中心分布式配置

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最近在学习springcloud，做下笔记以及记下遇到的坑。

1.建立maven工程，结构很简单，一个启动类和一个配置文件，结构如下图所示

2.启动类代码如下，需要添加注册中心注解：EnableEurekaServer 

 package com.chendb.eureka;

 import org.springframework.boot.SpringApplication;

 import org.springframework.boot.autoconfigure.SpringBootApplication;

 import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

 @SpringBootApplication

 @EnableEurekaServer

 public class SpringCloudEurekaApplication {

     public static void main(String[] args) {

         SpringApplication.run(SpringCloudEurekaApplication.class, args);

     }

 }

3.配置文件application.yml如下代码，在这里遇到了一个坑，项目能够成功启动，但是访问配置中心一直报404，经过查询，是因为freemarker的viewResolver没有在spring-cloud-netflix-eureka-server-2.1.0.RELEASE.jar中找到模板，导致访问注册中心报404，故需要在配置文件加上

spring:

freemarker:
prefer-file-system-access: false

这里一共配置了三个配置中心，可通过替换配置分别启动，形成分布式 

spring:

  profiles:

    active: dev1

  # freemarker的viewResolver没有在spring-cloud-netflix-eureka-server-1.3.1.RELEASE.jar中找到模板，导致访问注册中心报404

  freemarker:

    prefer-file-system-access: false

---

spring:

  application:

    ###当前服务名

    name: eureka-peer

  profiles: dev

server:

  ##端口号

  port: 10000

---

spring:

  profiles: dev1

  application:

    name: eureka-peer2

server:

  port: 10001

---

spring:

   profiles: dev2

   application:

     name: eureka-peer3

server:

  port: 10002

---

eureka:

  instance:

    hostname: dev1

  client:

    ##检索服务

    fetch-registry: false

    ##是否将自己注册到eureka

    register-with-eureka: false

    ##客户端默认去这个地址找注册中心

    service-url:

      defaultZone: http://localhost:10000/eureka/,http://localhost:10001/eureka/,http://localhost:10002/eureka/

  server:

    ### 当eureka启动时，不能从集群节点中获取到instance注册信息，应该等多久

    wait-time-in-ms-when-sync-empty: 0

    enable-self-preservation: true

    ###eureka多长时间更新一次数据

    peer-eureka-nodes-update-interval-ms: 100000

3.pom.xml文件 

<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>

  <parent>

      <groupId>org.springframework.boot</groupId>

      <artifactId>spring-boot-starter-parent</artifactId>

      <version>2.1.3.RELEASE</version>

      <relativePath/> <!-- lookup parent from repository -->

  </parent>

  <groupId>spring-cloud-eureka-server</groupId>

  <artifactId>spring-cloud-eureka-server</artifactId>

  <version>0.0.1-SNAPSHOT</version>

  <packaging>jar</packaging>

  <name>spring-cloud-eureka-server</name>

  <url>http://maven.apache.org</url>

  <properties>

    <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

    <java.version>1.8</java.version>

    <spring-cloud.version>Greenwich.RELEASE</spring-cloud.version>

  </properties>

    <dependencies>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-actuator</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-web</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-eureka-server</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>

    <repositories>

        <repository>

            <id>spring-milestones</id>

            <name>Spring Milestones</name>

            <url>https://repo.spring.io/milestone</url>

        </repository>

    </repositories>

</project>

4.运行启动类，访问http://localhost:10001即可，如下图

5.配置客户端，客户端代码结构如下

6.客户端启动类的配置文件如下 

 package com.chendb.eureka;

 import org.springframework.boot.SpringApplication;

 import org.springframework.boot.autoconfigure.SpringBootApplication;

 import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

 @SpringBootApplication

 @EnableEurekaClient

 public class SpringCloudEurekaClient {

     public static void main(String[] args) {

         SpringApplication.run(SpringCloudEurekaClient.class, args);

     }

 }
 spring:

   application:

     name: eureka-client

   # freemarker的viewResolver没有在spring-cloud-netflix-eureka-server-1.3.1.RELEASE.jar中找到模板，导致访问注册中心报404

   freemarker:

     prefer-file-system-access: false

 server:

   port: 8001

 eureka:

   client:

     service-url:

       defaultZone: http://localhost:10000/eureka/,http://localhost:10001/eureka/,http://localhost:10002/eureka/

7.启动后可以看到该客户端已经被注册到服务端

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