SpringCloud - 服务注册与发现（Eureka）

其他 2020-04-11 18:07:03 阅读次数: 0

 

Eureka Server

<?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>

	<groupId>com.imooc</groupId>
	<artifactId>eureka</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<packaging>jar</packaging>

	<name>eureka</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.M3</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>
		<spring-cloud.version>Finchley.M2</spring-cloud.version>
	</properties>

	<dependencies>
		<dependency>
			<groupId>org.springframework.cloud</groupId>
			<artifactId>spring-cloud-starter-netflix-eureka-server</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>

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

	<repositories>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

	<pluginRepositories>
		<pluginRepository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</pluginRepository>
		<pluginRepository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</pluginRepository>
	</pluginRepositories>

</project>
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
    register-with-eureka: false
  server:
    # 如果在开发模式下不希望一会上线一会下线的客户端被认为是在线。那就这样设置。
    # 是要在服务中心的配置里面写在application.yml，eureka.server.enable-self-preservation:false配置注意只能在开发环境把它关闭，生成环境不要关闭了一定要打开，方便做微服务的调用，不会出现错误
    enable-self-preservation: false
spring:
  application:
    name: eureka
server:
  port: 8761
package com.imooc.eureka;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;

@SpringBootApplication
@EnableEurekaServer
public class EurekaApplication {

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

后台启动： nohup java -jar xx.jar > /dev/null 2>&1 & 其中2代表标注错误，1代表标准输出：2>&1为将错误输出行为重定向到标准输出 而/dev/null代表垃圾桶，&代表后台运行，nohup代表终端关闭也不挂断程序 整体理解：使程序在后台运行且不保存输出文件（标准错误重定向到标准输出，而标准输出重定向到/dev/null，即不保存）

5e900a8e0001a91319201080.jpg (1920×1080)

 

Eureka Client

5e900ae900018efd19201080.jpg (1920×1080)

<?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>

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

	<name>client</name>
	<description>Demo project for Spring Boot</description>

	<parent>
		<groupId>org.springframework.boot</groupId>
		<artifactId>spring-boot-starter-parent</artifactId>
		<version>2.0.0.M3</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>
		<spring-cloud.version>Finchley.M2</spring-cloud.version>
	</properties>

	<dependencies>
		<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-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>

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

	<repositories>
		<repository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</repository>
		<repository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

	<pluginRepositories>
		<pluginRepository>
			<id>spring-snapshots</id>
			<name>Spring Snapshots</name>
			<url>https://repo.spring.io/snapshot</url>
			<snapshots>
				<enabled>true</enabled>
			</snapshots>
		</pluginRepository>
		<pluginRepository>
			<id>spring-milestones</id>
			<name>Spring Milestones</name>
			<url>https://repo.spring.io/milestone</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</pluginRepository>
	</pluginRepositories>

</project>
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
#  instance:
#    hostname: clientName
spring:
  application:
    name: client
package com.imooc.client;

import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.client.discovery.EnableDiscoveryClient;

@SpringBootApplication
@EnableDiscoveryClient
public class ClientApplication {

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

高可用

5e900d410001d26c19201080.jpg (1920×1080)

5e900d9a0001be5719201080.jpg (1920×1080)

这里以三台高可用来举例

Eureka Server 1

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8762/eureka/, http://localhost:8763/eureka/
    register-with-eureka: false
  server:
    enable-self-preservation: false
spring:
  application:
    name: eureka
server:
  port: 8761

Eureka Server 2

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/, http://localhost:8763/eureka/
    register-with-eureka: false
  server:
    enable-self-preservation: false
spring:
  application:
    name: eureka
server:
  port: 8762

Eureka Server 3

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/, http://localhost:8762/eureka/
    register-with-eureka: false
  server:
    enable-self-preservation: false
spring:
  application:
    name: eureka
server:
  port: 8763

Eureka Client

eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/, http://localhost:8762/eureka/, http://localhost:8763/eureka/
#  instance:
#    hostname: clientName
spring:
  application:
    name: client

5e900dc30001a14819201080.jpg (1920×1080)

5e5f2d7d000123f019201080.jpg (1920×1080)

附

分布式系统中为啥需要服务发现，这个问题我也反复思考过。后来也在网上找到答案了。 现在A是一个，B是多节点的（也就是集群）。怎么A去找B呢，那么就是自己写匹配，一个一个写。但是由于B不仅多，还可能会动态变化，把B的IP地址写到A里面，是不好的，因为地址可能少，也可能变。 现在的话，有注册中心，会自动的注册上去。

5e9014df00013e4319201080.jpg (1920×1080)

5d8099cf0001f3a019201080.jpg (1920×1080)

5e034e400001ccaf19201080.jpg (1920×1080)

5d187de40001c2b619201080.jpg (1920×1080)

  • SpringCloud的调用方式：REST，其他语言可实现Eureka的客户端。
Lux_Sun
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