SpringCloud的學習-高可用的分佈式配置中心(7)

之前只是單純的讓某個配置中心從GIT上獲取配置文件，然後有一個客戶端Client使用從GIT上的配置文件。但是隨着服務的增多，如果都使用同一個配置中心，萬一此配置中心掛了，那麼依賴此配置中心的所有微服務系統就全部崩潰了。所以，爲了避免這種情況的出現，那麼就部署多個配置中心，防止某個配置中心節點故障導致的整個系統的崩潰的情況。因此，需要把配置中心與微服務Client 都註冊到註冊中心中統一管理，架構圖如下：

一，搭建註冊中心

同樣新建項目,項目名稱爲eureka-server

1.1 導入依賴

<?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 添加註解
添加@EnableEurekaServer即可

@EnableEurekaServer

二，配置config-server

2.1 修改Pom文件配置
在Pom中添加其他依賴

    <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
到註冊中心註冊

eureka:
  client:
    serviceUrl:
      defaultZone: http://localhost:8880/eureka/

2.3 添加註解
在啓動類上添加註解

@SpringBootApplication
@EnableEurekaClient
@EnableConfigServer
public class ConfigserverApplication {

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

三，配置config-client

3.1 添加依賴
Client端也需要添加註冊中心

        <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 修改啓動類

@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，測試

訪問 http://localhost:8881/hh
將會顯示

world