Config分布式配置中心
Config分布式配置中心
微服务意味着要将单位应用中的业务拆分成一个个子服务,每个服务的粒度相对较小,因此系统中会出现大量的服务。由于每个服务都需要必要的配置信息才能运行,所以一套集中式的、动态的配置管理设施是必不可少的。
SpringCloud提供了ConfigServer来解决这个问题,我们每一个微服务自己带着一个application.yml,上百个微服务的配置文件管理起来难度大。
SpringCloud Config为微服务架构中的微服务提供集中化的外部配置支持,配置服务器为各个不同微服务应用的所有环境提供了一个中心化的外部配置。
Config配置中心搭建
创建子项目(cloud-config-center-3344)
pom.xml
<?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">
<parent>
<artifactId>cloud2020</artifactId>
<groupId>com.atguigu.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-config-center-3344</artifactId>
<dependencies>
<!--添加消息总线RabbitMQ支持-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bus-amqp</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>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
</project>
创建application.yml配置文件
server:
port: 3344
spring:
application:
name: cloud-config-center #注册进Eureka服务器的微服务名
cloud:
config:
server:
git:
uri: https://gitee.com/scProgrammer/springcloud-config.git #git仓库的名字
search-paths:
- springcloud-config
label: master
eureka:
client:
service-url:
defaultZone: http://localhost:7001/eureka
创建主启动类ConfigCenterMain3344
@SpringBootApplication
@EnableConfigServer
public class ConfigCenterMain3344 {
public static void main(String[] args) {
SpringApplication.run(ConfigCenterMain3344.class,args);
}
}
修改host文件
Config客户端配置与测试
新建子项目(cloud-config-client-3355)
pom.xml
<dependencies>
<!-- 添加消息总线RabbitMQ支持-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-bus-amqp</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-config</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</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-actuator</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
</dependencies>
application.yml是用户级的资源配置项
bootstrap.yml是系统级的,优先级更加高
创建bootstrap.yml
server:
port: 3355
spring:
application:
name: config-client
cloud: #客户端配置
config:
label: master #分支名称
name: config #配置文件名称
profile: dev #读取后缀名称
uri: http://localhost:3344 #配置中心地址
eureka:
client:
service-url:
defaultZone: http://localhost:7001/eureka
创建主启动类ConfigClientMain3355
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
@SpringBootApplication
@EnableEurekaClient
public class ConfigClientMain3355 {
public static void main(String[] args) {
SpringApplication.run(ConfigClientMain3355.class,args);
}
}
创建业务类ConfigClientController
@RestController
public class ConfigClientController {
@Value("${config.info}")
private String configInfo;
@GetMapping("/configInfo")
public String getConfigInfo() {
return configInfo;
}
}
运行
分布式配置的动态刷新问题
- Linux运维修改GitHub上的配置文件内容做调整
- 刷新3344,发现ConfigServer配置中心立刻响应
- 刷新3355,发现ConfigClient客户端没有任何响应
- 3355没有变化除非自己重启或者重新加载
- 微服务一定要避免客户端重启
Config动态刷新(手动版)
子项目(cloud-config-client-3355)修改yml暴露端口
#暴露端口
management:
endpoints:
web:
exposure:
include: "*"
给业务类ConfigClientController加上注解
@RestController
@RefreshScope //自动刷新
public class ConfigClientController {
@Value("${config.info}")
private String configInfo;
@GetMapping("/configInfo")
public String getConfigInfo() {
return configInfo;
}
}
运行
在GitHub上修改完成后win+r输入cmd
在DOS窗口下输入
curl -X POST "http://localhost:3355/actuator/refresh"
3355客户端刷新就能收到最新的配置。