SpringCloud的学习-高可用的分布式配置中心(7)
之前只是单纯的让某个配置中心从GIT上获取配置文件,然后有一个客户端Client使用从GIT上的配置文件。但是随着服务的增多,如果都使用同一个配置中心,万一此配置中心挂了,那么依赖此配置中心的所有微服务系统就全部崩溃了。所以,为了避免这种情况的出现,那么就部署多个配置中心,防止某个配置中心节点故障导致的整个系统的崩溃的情况。因此,需要把配置中心与微服务Client 都注册到注册中心中统一管理,架构图如下:
一,搭建注册中心
同样新建项目,项目名称为eureka-server
1.1 导入依赖
<?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 http://maven.apache.org/xsd/maven-4.0.0.xsd">
<modelVersion>4.0.0</modelVersion>
<groupId>com.example</groupId>
<artifactId>config</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>config</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-netflix-eureka-server</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>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-netflix-eureka-server</artifactId>
<version>2.1.1.RELEASE</version>
</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>
1.2 配置application.yml
server:
port: 8880
eureka:
instance:
hostname: localhost
client:
registerWithEureka: false
fetchRegistry: false
serviceUrl:
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
1.3 添加注解
添加@EnableEurekaServer即可
@EnableEurekaServer
二,配置config-server
2.1 修改Pom文件配置
在Pom中添加其他依赖
<dependencies>
<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>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
</dependencies>
2.2 修改application.yml文件
到注册中心注册
eureka:
client:
serviceUrl:
defaultZone: http://localhost:8880/eureka/
2.3 添加注解
在启动类上添加注解
@SpringBootApplication
@EnableEurekaClient
@EnableConfigServer
public class ConfigserverApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigserverApplication.class, args);
}
}
三,配置config-client
3.1 添加依赖
Client端也需要添加注册中心
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
3.2 修改bootstrap.properties配置文件
注意是bootstrap.properties配置文件
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:8880/eureka/
spring.cloud.config.discovery.enabled=true
spring.cloud.config.discovery.serviceId=config-server
server.port=8881
3.3 修改启动类
@SpringBootApplication
@EnableEurekaClient
@RestController
@RefreshScope
public class ConfigclientApplication {
public static void main(String[] args) {
SpringApplication.run(ConfigclientApplication.class, args);
}
@Value("${hello}")
private String hello;
@RequestMapping("/hh")
public String hh(){
return hello;
}
}
四,测试
访问 http://localhost:8881/hh
将会显示
world