SpringCloud分布式微服务云架构 第七篇: 高可用的分布式配置中心(Spring Cloud

一、准备工作

继续使用上一篇文章的工程创建一个eureka-server工程用作服务注册中心。

在其pom.xml文件引入Eureka的起步依赖spring-cloud-starter-netflix- eureka-server代码如下:

<?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>com.forezp</groupId>  
    <artifactId>config-server</artifactId>  
    <version>0.0.1-SNAPSHOT</version>  
    <packaging>jar</packaging>  
  
    <name>config-server</name>  
    <description>Demo project for Spring Boot</description>  
  
    <parent>  
        <groupId>com.forezp</groupId>  
        <artifactId>sc-f-chapter7</artifactId>  
        <version>0.0.1-SNAPSHOT</version>  
    </parent>  
  
    <dependencies>  
        <dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>  
        </dependency>  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-web</artifactId>  
        </dependency>  
        <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>  
  
  
  
</project>  
 

server:  
  port: 8889  
  
eureka:  
  instance:  
    hostname: localhost  
  client:  
    registerWithEureka: false  
    fetchRegistry: false  
    serviceUrl:  
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/  

@EnableEurekaServer  
@SpringBootApplication  
public class EurekaServerApplication {  
  
    public static void main(String[] args) {  
        SpringApplication.run(EurekaServerApplication.class, args);  
    }  
}  
 

二、改造config-server

在其pom.xml文件加上EurekaClient的起步依赖spring-cloud-starter-netflix-eureka-client代码如下:

<dependencies>  
        <dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>  
        </dependency>  
        <dependency>  
            <groupId>org.springframework.boot</groupId>  
            <artifactId>spring-boot-starter-web</artifactId>  
        </dependency>  
        <dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-config-server</artifactId>  
        </dependency>  
  
    </dependencies>  

spring.application.name=config-server  
server.port=8888  
  
spring.cloud.config.server.git.uri=https://github.com/forezp/SpringcloudConfig/  
spring.cloud.config.server.git.searchPaths=respo  
spring.cloud.config.label=master  
spring.cloud.config.server.git.username= your username  
spring.cloud.config.server.git.password= your password  
eureka.client.serviceUrl.defaultZone=http://localhost:8889/eureka/  

 后需要在程序的启动类Application加上@EnableEureka的注解。

三、改造config-client

将其注册微到服务注册中心作为Eureka客户端需要pom文件加上起步依赖spring-cloud-starter-netflix-eureka-client代码如下

<dependencies>  
        <dependency>  
            <groupId>org.springframework.cloud</groupId>  
            <artifactId>spring-cloud-starter-config</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-client</artifactId>  
        </dependency>  
    </dependencies>  

spring.application.name=config-client  
spring.cloud.config.label=master  
spring.cloud.config.profile=dev  
#spring.cloud.config.uri= http://localhost:8888/  
  
eureka.client.serviceUrl.defaultZone=http://localhost:8889/eureka/  
spring.cloud.config.discovery.enabled=true  
spring.cloud.config.discovery.serviceId=config-server  
server.port=8881  

 spring.cloud.config.discovery.enabled 是从配置中心读取文件。

spring.cloud.config.discovery.serviceId 配置中心的servieId即服务名。

这时发现在读取配置文件不再写ip地址而是服务名这时如果配置服务部署多份通过负载均衡从而高可用。

依次启动eureka-servr,config-server,config-client

访问网址http://localhost:8889/ 

foo version 3