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高可用的分布式配置中心(Spring Cloud Config)
上一篇內容講述，一個服務如何從配置中心讀取文件，配置中心如何從遠程Git讀取配置文件，當服務很多時，都需要同時從配置中心讀取文件的時候，這時我們可以考慮將配置中心做成一個微服務，並且將其集群化，從而達到高可用，架構圖如下：
一、準備工作
繼續使用上一篇文章的工程，創建一個eureka-server工程，用作服務中心。
其pom.xml:
<?xml version="1.0" encoding="UTF-8"?>
<project xmlns="https://maven.apache.org/POM/4.0.0" xmlns:xsi="https://www.w3.org/2001/XMLSchema-instance"
xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://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: https://${eureka.instance.hostname}:${server.port}/eureka/
入口類：
@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,將其注冊問服務：
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=https://localhost:8889/eureka/
三、改造config-client
將其注冊微 eureka服務，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= https://localhost:8888/
eureka.client.serviceUrl.defaultZone=https://localhost:8889/eureka/
spring.cloud.config.discovery.enabled=true
spring.cloud.config.discovery.serviceId=config-server
server.port=8881
spring.cloud.config.discovery.enabled 是非從配置中心讀取文件
spring.cloud.config.discovery.serviceId 配置中心的servieId，即服務名
這時發現，在讀取配置文件不再寫ip地址，而是服務名，這時如果配置服務部署多份，通過負載均衡，從而高可用。
一次啟動eureka-servr,config-server,config-client
訪問網址：https://localhost:8889/
訪問https://localhost:8881/hi，瀏覽器顯示：
foo version 3
本文源碼下載：
https://github.com/forezp/SpringCloudLearning/tree/master/chapter7
文章來源：https://blog.csdn.net/forezp/article/details/70037513
最後更新：2017-08-14 12:32:15