学习笔记:微服务-22 spring cloud config+kafka+spring cloud bus 消息总线实现配置自动更新

其他 2019-01-30 03:11:04 阅读次数: 0

上节配置了spring cloud config server，集中管理配置文件，当配置文件发生变化时，客户端通过

curl -X POST http://客户端地址:端口/actuator/refresh 可以刷新客户端配置，但是如果微服务多了，一个微服务有多个实例在运行，需要一个个去刷新，采用bus消息总线，可以实现一键刷新所有实例的配置。

原理图：

一、启动kafka （安装参看我的其他文章）

cd  kafka_2.12-2.1.0

启动自带的zookeeper

bin/zookeeper-server-start.sh config/zookeeper.properties &     

启动kafka

bin/kafka-server-start.sh config/server.properties &

查看topic

bin/kafka-topics.sh --zookeeper 127.0.0.1:2181 --list

二、spring cloud config  server 配置

1. 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">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.linbsoft</groupId>
	<artifactId>microservice-config-server-8401</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>microservice-config-server-8401</name>
	<description>Demo project for Spring Boot microservice-microservice-config-server-8401</description>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
		<spring-cloud.version>Greenwich.M3</spring-cloud.version><!-- Finchley.M8 -->
	</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-web</artifactId>
		</dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</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-bus-kafka</artifactId>
</dependency>
    <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-stream-kafka</artifactId>
   </dependency>
		<dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-bus</artifactId>
        </dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-actuator</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>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
		<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

       其中： spring-cloud-starter-bus-kafka  ，spring-cloud-starter-stream-kafka，spring-cloud-bus是对kafka bus总线的支持

2.  application.properties文件

server.port=8401
spring.application.name=MicroserviceConfigServer8401
eureka.client.serviceUrl.defaultZone=http://admin:[email protected]:8101/eureka/,http://admin:[email protected]:8102/eureka/
spring.profiles.active=native
spring.cloud.config.server.native.search-locations=classpath:/config

#以下是gitub获取配置文件

#spring.cloud.config.server.git.uri=https://github.com/XXX/spring-cloud-config
#spring.cloud.config.label=master
#spring.cloud.config.server.git.searchPaths=config-repo
#spring.cloud.config.server.git.username=XXX
#spring.cloud.config.server.git.password=***

spring.cloud.bus.enabled=true
spring.kafka.bootstrap-servers=centos7.linbsoft.com:9092
management.endpoints.web.exposure.include=*
spring.cloud.bus.refresh.enabled=true

3. 启动类加注解

@EnableConfigServer

三、spring cloud config client

自动配置客户端设置

1. 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">
	<modelVersion>4.0.0</modelVersion>
	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.1.1.RELEASE</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>
	<groupId>com.linbsoft</groupId>
	<artifactId>microservice-serverA-8801</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>microservice-serverA-8801</name>
	<description>Demo project for Spring Boot microservice-microservice-serverA-8801</description>

	<properties>
		<project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>
		<project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>
		<java.version>1.8</java.version>
		<spring-cloud.version>Greenwich.M3</spring-cloud.version><!-- Finchley.M8 -->
	</properties>
	<dependencies>
		<dependency>
			<groupId>org.springframework.boot</groupId>
			<artifactId>spring-boot-starter-web</artifactId>
		</dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</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-bus-kafka</artifactId>
</dependency>
         <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-stream-kafka</artifactId>
         </dependency>
        
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-bus</artifactId>
        </dependency>
             <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-actuator-autoconfigure</artifactId>
        </dependency>
<dependency>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
    <dependency>
    <groupId>de.codecentric</groupId>
    <artifactId>spring-boot-admin-starter-client</artifactId>
    <version>2.1.1</version>
  </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>${spring-cloud.version}</version>
				<type>pom</type>
				<scope>import</scope>
			</dependency>
		</dependencies>
	</dependencyManagement>
		<repositories>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>
	<build>
		<plugins>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
			</plugin>
		</plugins>
	</build>
</project>

像server一样，加入了spring-cloud-starter-bus-kafka  ，spring-cloud-starter-stream-kafka，spring-cloud-bus依赖。

2. bootstrap.properties 这个先于从配置服务器取得的配置文件

spring.application.name=MicroserviceServerA8801
server.port=8801
eureka.client.serviceUrl.defaultZone=http://admin:[email protected]:8101/eureka/,http://admin:[email protected]:8102/eureka/
#spring.cloud.config.uri=http://centos7.linbsoft.com:8401
spring.cloud.config.enabled=true
spring.cloud.config.profile=dev
spring.cloud.config.discovery.enabled=true
spring.cloud.config.discovery.serviceId=MicroserviceConfigServer8401
management.endpoints.web.exposure.include=*
management.security.enabled=false
spring.cloud.stream.default-binder=kafka
spring.cloud.bus.enabled=true
spring.kafka.bootstrap-servers=centos7.linbsoft.com:9092
spring.cloud.bus.trace.enabled=true
spring.cloud.bus.refresh.enabled=true

3. 在启动类加入注解

@EnableDiscoveryClient

4. 增加测试类，就是显示姓名，年龄，这两个值是写在配置中心的配置文件中的

@RestController
@RefreshScope
public class TestController {
    
    @Value("${name}")
    private String name;
    @Value("${age}")
    private Integer age;

    @RequestMapping("/test")
    public String test(){
        return this.name+this.age;
    }
}

5.配置中心的配置文件

/microservice-config-server-8401/src/main/resources/config/MicroserviceServerA8801-dev.properties

内容简单两行：

name=linbin
age=88

四.测试

1.配置修改前的config server中配置文件

2.配置修改前测试客户端读取的配置文件

3. 修改配置文件

4. 保存后查看config server已变化

5. 启动刷新，spring cloud config server自动向kafka总线发出消息

（1）为了检测消息，先启动一个消费者进程监控消息

bin/kafka-console-consumer.sh --bootstrap-server localhost:9092 --topic springCloudBusOutput --from-beginning

（2）开启另外一个shell，向spring cloud config server发出刷新配置的post请求

curl -X POST http://centos7.linbsoft.com:8401/actuator/bus-refresh

（3）在（1）的监控shell可以看到向kafka发出的消息

（5）查看客户端是否更新类配置文件

可以看见客户端已更新了配置文件

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转载自blog.csdn.net/oLinBSoft/article/details/86586467
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