閱讀675 返回首頁    go 阿裏雲 go 技術社區[雲棲]

SpringCloud--分布式配置中心(Spring Cloud Config)

一、簡介

在分布式係統中，spring cloud config 提供一個服務端和客戶端去提供可擴展的配置服務。我們可用用配置服務中心區集中的管理所有的服務的各種環境配置文件。配置服務中心采用Git的方式存儲配置文件，因此我們很容易部署修改，有助於對環境配置進行版本管理。

二、構建Config Server

創建一個spring-boot項目，取名為config-server,其pom.xml:
```<?xml version="1.0" encoding="UTF-8"?>
xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0

<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>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-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>

<dependencyManagement>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-dependencies</artifactId>
            <version>Camden.SR6</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>


在程序的入口Application類加上@EnableConfigServer注解開啟配置服務器。

@SpringBootApplication
@EnableConfigServer
public class ConfigServerApplication {

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

}

需要在配置中心配置下：

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

         spring.cloud.config.server.git.uri：配置git倉庫地址
         spring.cloud.config.server.git.searchPaths：配置倉庫路徑
         spring.cloud.config.label：配置倉庫的分支
         spring.cloud.config.server.git.username：訪問git倉庫的用戶名
         spring.cloud.config.server.git.password：訪問git倉庫的用戶密碼

遠程倉庫https://github.com/forezp/SpringcloudConfig/ 中又個文件config-client-dev.properties文件中有一個屬性：

foo = foo version 3

啟動程序：訪問https://localhost:8888/foo/dev

```{"name":"foo","profiles":["dev"],"label":"master",
"version":"792ffc77c03f4b138d28e89b576900ac5e01a44b","state":null,"propertySources":[]}

證明配置服務中心可以從遠程程序獲取配置信息。

http請求地址和資源文件映射如下:

    /{application}/{profile}[/{label}]
    /{application}-{profile}.yml
    /{label}/{application}-{profile}.yml
    /{application}-{profile}.properties
    /{label}/{application}-{profile}.properties

三、構建一個config client

重新創建一個springboot項目，取名為config-client,其pom文件：
```<?xml version="1.0" encoding="UTF-8"?>
xsi:schemaLocation="https://maven.apache.org/POM/4.0.0 https://maven.apache.org/xsd/maven-4.0.0.xsd">
4.0.0

<groupId>com.forezp</groupId>
<artifactId>config-client</artifactId>
<version>0.0.1-SNAPSHOT</version>
<packaging>jar</packaging>

<name>config-client</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-config</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>



其配置文件：
```spring.application.name=config-client
spring.cloud.config.label=master
spring.cloud.config.profile=dev
spring.cloud.config.uri= https://localhost:8888/
server.port=8881

 spring.cloud.config.label 指明遠程倉庫的分支
 spring.cloud.config.profile

      dev開發環境配置文件
      test測試環境
      pro正式環境
 spring.cloud.config.uri= https://localhost:8888/ 指明配置服務中心的網址。

程序的入口類：

@RestController
public class ConfigClientApplication {

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

    @Value("${foo}")
    String foo;
    @RequestMapping(value = "/hi")
    public String hi(){
        return foo;
    }
}

打開網址訪問：https://localhost:8881/hi，網頁顯示：

foo version 3

這就說明，config-client從config-server獲取了foo的屬性，而config-server是從git倉庫讀取的,如圖：

本文源碼下載：
https://github.com/forezp/SpringCloudLearning/tree/master/chapter6

最後更新：2017-08-13 22:26:50

  上一篇：go  你不得不知的推進DevOps實踐的四大趨勢
  下一篇：go  阿裏雲ECS無法連接阿裏雲數據庫的一般原因