SpringCloud第八篇-Spring Cloud Config集群

概述

上一篇文章讲述了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，当服务实例很多时，都从配置中心读取文件，这时可以考虑将配置中心做成一个微服务，将其集群化，从而达到高可用，架构图如下：

项目准备

• config-eureka-server：eureka-server拷贝之前的工程命名为config-eureka-server，用作服务注册中心，端口修改为8889
• config-server服务配置服务端

• config-client 服务配置客户端

  相对于上一篇我们只是在pom中加入了注册中心的依赖，并且在启动类上加上@EnableEurekaClient注解启用注册中心

config-server

pom

<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>4.0.0modelVersion>

    <groupId>com.bamboogroupId>
    <artifactId>config-serverartifactId>
    <packaging>jarpackaging>
    <version>1.0-SNAPSHOTversion>


    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>1.5.2.RELEASEversion>
        <relativePath/> 
    parent>

    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
        <java.version>1.8java.version>
    properties>

    <dependencies>


        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>

        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-eurekaartifactId>
        dependency>


        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-config-serverartifactId>
        dependency>

    dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloudgroupId>
                <artifactId>spring-cloud-dependenciesartifactId>
                <version>Camden.SR6version>
                <type>pomtype>
                <scope>importscope>
            dependency>
        dependencies>
    dependencyManagement>


    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>

    <repositories>
        <repository>
            <id>spring-milestonesid>
            <name>Spring Milestonesname>
            <url>https://repo.spring.io/milestoneurl>
            <snapshots>
                <enabled>falseenabled>
            snapshots>
        repository>
    repositories>

project>

application.properties

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

#配置中心
eureka.client.serviceUrl.defaultZone=http://localhost:8889/eureka/

java

package com.bamboo;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.config.server.EnableConfigServer;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

/**
 * Created by xialeme on 2017/10/25.
 */
@SpringBootApplication
@EnableConfigServer//注解开启配置服务器的功能
@EnableEurekaClient//启动注册中心客户端
public class ConfigServerApplication {

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

config-client

pom

<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">

    <groupId>com.bamboogroupId>
    <version>1.0-SNAPSHOTversion>
    <modelVersion>4.0.0modelVersion>
    <artifactId>config-clientartifactId>


    <parent>
        <groupId>org.springframework.bootgroupId>
        <artifactId>spring-boot-starter-parentartifactId>
        <version>1.5.2.RELEASEversion>
        <relativePath/> 
    parent>

    <properties>
        <project.build.sourceEncoding>UTF-8project.build.sourceEncoding>
        <project.reporting.outputEncoding>UTF-8project.reporting.outputEncoding>
        <java.version>1.8java.version>
    properties>

    <dependencies>
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-configartifactId>
        dependency>

        
        <dependency>
            <groupId>org.springframework.cloudgroupId>
            <artifactId>spring-cloud-starter-eurekaartifactId>
        dependency>


        
        <dependency>
            <groupId>org.springframework.bootgroupId>
            <artifactId>spring-boot-starter-testartifactId>
            <scope>testscope>
        dependency>
    dependencies>

    <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloudgroupId>
                <artifactId>spring-cloud-dependenciesartifactId>
                <version>Dalston.RC1version>
                <type>pomtype>
                <scope>importscope>
            dependency>
        dependencies>
    dependencyManagement>

    <build>
        <plugins>
            <plugin>
                <groupId>org.springframework.bootgroupId>
                <artifactId>spring-boot-maven-pluginartifactId>
            plugin>
        plugins>
    build>

    <repositories>
        <repository>
            <id>spring-milestonesid>
            <name>Spring Milestonesname>
            <url>https://repo.spring.io/milestoneurl>
            <snapshots>
                <enabled>falseenabled>
            snapshots>
        repository>
    repositories>

project>

bootstrap.properties

配置文件bootstrap.properties，注意是bootstrap。

spring.application.name=config-client
spring.cloud.config.label=master
spring.cloud.config.profile=dev
#配置请求的地址
#spring.cloud.config.uri= http://localhost:8888/

##配置中心，启用发现，请求的服务是config-server
eureka.client.serviceUrl.defaultZone=http://localhost:8889/eureka/
spring.cloud.config.discovery.enabled=true
spring.cloud.config.discovery.serviceId=config-server


server.port=8881

-eureka.client.serviceUrl.defaultZone 加上服务注册地址为http://localhost:8889/eureka/
- spring.cloud.config.discovery.enabled 是从配置中心读取文件。
- spring.cloud.config.discovery.serviceId 配置中心的servieId，即服务名。

java

package com.bamboo;

import org.springframework.beans.factory.annotation.Value;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
import org.springframework.web.bind.annotation.RequestMapping;
import org.springframework.web.bind.annotation.RestController;

/**
 * Created by xialeme on 2017/10/25.
 */
@SpringBootApplication
@RestController
@EnableEurekaClient//启动注册中心客户端
public class ConfigClientApplication {

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

    @Value("${foo}")
    String foo;
    //提供客户端调用的接口
    @RequestMapping(value = "/hello")
    public String hi(){
        return foo;
    }
}

运行并查看结果

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

访问http://localhost:8881/hello，浏览器显示：

foo version 2