高可用的分布式配置中心(Spring Cloud Config)

上一篇内容讲述，一个服务如何从配置中心读取文件，配置中心如何从远程Git读取配置文件，当服务很多时，都需要同时从配置中心读取文件的时候，这时我们可以考虑将配置中心做成一个微服务，并且将其集群化，从而达到高可用，架构图如下：

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，用作服务中心。

其pom.xml:

<?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>eureka-server</artifactId> <version>0.0.1-SNAPSHOT</version> <packaging>jar</packaging> <name>eureka-server</name> <description>Demo project for Spring Boot</description> <parent> <groupId>org.springframework.boot</groupId> <artifactId>spring-boot-starter-parent</artifactId> <version>1.5.2.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> </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-web</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>Dalston.RC1</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> <snapshots> <enabled>false</enabled> </snapshots> </repository> </repositories> </project>

配置文件：

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

入口类：

@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文件下:

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

配置文件,将其注册问服务：

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/

三、改造config-client

将其注册微 eureka服务，pom文件配置：

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

配置文件，bootstrap.properties

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 是非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。

一次启动eureka-servr,config-server,config-client 访问网址：http://localhost:8889/

访问http://localhost:8881/hi，浏览器显示：

foo version 3

本文源码下载： https://github.com/forezp/SpringCloudLearning/tree/master/chapter7

文章来源：http://blog.csdn.net/forezp/article/details/70037513

相关资源：SpringCloud之分布式配置中心Spring Cloud Config高可用配置实例代码