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SpringCloud 集成 Eureka Server

深色風信子 2024-06-17 10:43:23

简介SpringCloud 集成 Eureka Server

SpringCloud 集成 Eureka Server

1 pom.xml
2 application.yml
3 appliction.java
4 启动

Eureka的优点：

简单易用：Eureka设计简单，容易上手和部署。
高可用性：Eureka支持高可用性配置，通过使用多个Eureka服务器实例来提供容错和故障恢复能力。
快速注册和发现：Eureka使用心跳机制来快速注册和发现服务，可以实时感知服务实例的变化。
社区支持：Eureka作为Netflix开源项目的一部分，有一个活跃的开发社区，提供技术支持和持续改进。

Eureka的缺点：
缺乏健壮性：在某些复杂网络环境下，Eureka的心跳机制可能导致一些问题，如延迟或数据不一致性。
功能有限：相对于其他服务注册中心，Eureka的功能相对较少，它主要专注于服务的注册和发现，缺乏一些高级功能。

Nacos的优点：
功能丰富：Nacos提供了广泛的功能，包括服务注册和发现、配置管理、动态路由等，可以满足更复杂的分布式系统需求。
可扩展性：Nacos支持集群部署和水平扩展，可以应对大规模系统和高并发流量。
健康检查：Nacos提供了健康检查机制，能够监测和移除不可用的服务实例，提高系统的可用性。
支持多种语言：Nacos支持多种编程语言和开发框架，适用于各种技术栈和开发团队。

Nacos的缺点：
复杂性：由于功能丰富，Nacos相对于Eureka而言更复杂一些，对于初学者来说上手和配置可能需要一些时间和学习成本。
较大的资源消耗：Nacos需要更多的系统资源来运行，特别是在大规模部署和高并发环境下，可能需要更多的计算和存储资源。

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 https://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>3.0.6</version>
		<relativePath/> <!-- lookup parent from repository -->
	</parent>

	<groupId>com.xu</groupId>
	<artifactId>eureka-server</artifactId>
	<version>0.0.1-SNAPSHOT</version>
	<name>eureka</name>

	<description>Eureka Server</description>

	<properties>
		<java.version>17</java.version>
		<spring-cloud.version>2022.0.2</spring-cloud.version>
	</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-server</artifactId>
		</dependency>

		<dependency>
			<groupId>com.github.ben-manes.caffeine</groupId>
			<artifactId>caffeine</artifactId>
			<version>3.1.6</version>
		</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>

	<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.graalvm.buildtools</groupId>
				<artifactId>native-maven-plugin</artifactId>
			</plugin>
			<plugin>
				<groupId>org.springframework.boot</groupId>
				<artifactId>spring-boot-maven-plugin</artifactId>
				<configuration>
					<excludes>
						<exclude>
							<groupId>org.projectlombok</groupId>
							<artifactId>lombok</artifactId>
						</exclude>
					</excludes>
				</configuration>
			</plugin>
		</plugins>
	</build>
	<repositories>
		<repository>
			<id>netflix-candidates</id>
			<name>Netflix Candidates</name>
			<url>https://artifactory-oss.prod.netflix.net/artifactory/maven-oss-candidates</url>
			<snapshots>
				<enabled>false</enabled>
			</snapshots>
		</repository>
	</repositories>

</project>

2 application.yml

# 服务端口
server:
  port: 9000

# 服务名字
spring:
  application:
    name: eureka-server

# Eureka 配置
eureka:
  dashboard:
    enabled: true
  instance:
    # 防止 The replica size seems to be empty. Check the route 53 DNS Registry 提示
    prefer-ip-address: true
    hostname: 127.0.0.1
  client:
    # false 表示不向注册中心注册自己。
    register-with-eureka: false
    # false 表示自己端就是维护服务实例的注册中心，不需要去检索服务。
    fetch-registry: false
    service-url:
      defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
  server:
    # 自我保护机制
    enable-self-preservation: false
    # 自我保护系数（默认0.85）
    renewal-percent-threshold: 0.85
    # 扫描失效服务时间间隔（单位毫秒，默认60*1000）60秒
    eviction-interval-timer-in-ms: 30000
    # 设置eureka server同步失败的等待时间，默认5分钟，在这期间它不向客户端提供服务注册信息
    wait-time-in-ms-when-sync-empty: 5
    # 设置eureka server同步失败的重试次数，默认为5次
    number-of-replication-retries: 5

3 appliction.java

package com.xu.eureka;

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

/**
 * @author hyacinth
 */
@EnableEurekaServer
@SpringBootApplication
public class EurekaApplication {

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

}

4 启动

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 =========|_|==============|___/=/_/_/_/
 :: Spring Boot ::                (v3.0.6)

2023-05-18T11:54:34.761+08:00  INFO 27992 --- [  restartedMain] com.xu.eureka.EurekaApplication          : Starting EurekaApplication using Java 17.0.7 with PID 27992 (E:SoureCodeLearneureka-server	argetclasses started by xuyq in E:SoureCodeLearneureka-server)
2023-05-18T11:54:34.765+08:00  INFO 27992 --- [  restartedMain] com.xu.eureka.EurekaApplication          : No active profile set, falling back to 1 default profile: "default"
2023-05-18T11:54:34.824+08:00  INFO 27992 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : Devtools property defaults active! Set 'spring.devtools.add-properties' to 'false' to disable
2023-05-18T11:54:34.824+08:00  INFO 27992 --- [  restartedMain] .e.DevToolsPropertyDefaultsPostProcessor : For additional web related logging consider setting the 'logging.level.web' property to 'DEBUG'
2023-05-18T11:54:35.801+08:00  INFO 27992 --- [  restartedMain] o.s.cloud.context.scope.GenericScope     : BeanFactory id=92ee8310-e18b-3993-a1c2-03e356109b2c
2023-05-18T11:54:36.288+08:00  INFO 27992 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat initialized with port(s): 9000 (http)
2023-05-18T11:54:36.295+08:00  INFO 27992 --- [  restartedMain] o.apache.catalina.core.StandardService   : Starting service [Tomcat]
2023-05-18T11:54:36.295+08:00  INFO 27992 --- [  restartedMain] o.apache.catalina.core.StandardEngine    : Starting Servlet engine: [Apache Tomcat/10.1.8]
2023-05-18T11:54:36.353+08:00  INFO 27992 --- [  restartedMain] o.a.c.c.C.[Tomcat].[localhost].[/]       : Initializing Spring embedded WebApplicationContext
2023-05-18T11:54:36.354+08:00  INFO 27992 --- [  restartedMain] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1528 ms
2023-05-18T11:54:37.157+08:00  INFO 27992 --- [  restartedMain] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON encoding codec LegacyJacksonJson
2023-05-18T11:54:37.160+08:00  INFO 27992 --- [  restartedMain] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON decoding codec LegacyJacksonJson
2023-05-18T11:54:37.288+08:00  INFO 27992 --- [  restartedMain] c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec XStreamXml
2023-05-18T11:54:37.288+08:00  INFO 27992 --- [  restartedMain] c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec XStreamXml
2023-05-18T11:54:38.026+08:00  INFO 27992 --- [  restartedMain] o.s.b.d.a.OptionalLiveReloadServer       : LiveReload server is running on port 35729
2023-05-18T11:54:38.123+08:00  INFO 27992 --- [  restartedMain] DiscoveryClientOptionalArgsConfiguration : Eureka HTTP Client uses RestTemplate.
2023-05-18T11:54:38.211+08:00  INFO 27992 --- [  restartedMain] o.s.c.n.eureka.InstanceInfoFactory       : Setting initial instance status as: STARTING
2023-05-18T11:54:38.240+08:00  INFO 27992 --- [  restartedMain] com.netflix.discovery.DiscoveryClient    : Initializing Eureka in region us-east-1
2023-05-18T11:54:38.240+08:00  INFO 27992 --- [  restartedMain] com.netflix.discovery.DiscoveryClient    : Client configured to neither register nor query for data.
2023-05-18T11:54:38.249+08:00  INFO 27992 --- [  restartedMain] com.netflix.discovery.DiscoveryClient    : Discovery Client initialized at timestamp 1684382078248 with initial instances count: 0
2023-05-18T11:54:38.281+08:00  INFO 27992 --- [  restartedMain] c.n.eureka.DefaultEurekaServerContext    : Initializing ...
2023-05-18T11:54:38.284+08:00  INFO 27992 --- [  restartedMain] c.n.eureka.cluster.PeerEurekaNodes       : Adding new peer nodes [http://127.0.0.1:9000/eureka/]
2023-05-18T11:54:38.369+08:00  INFO 27992 --- [  restartedMain] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON encoding codec LegacyJacksonJson
2023-05-18T11:54:38.370+08:00  INFO 27992 --- [  restartedMain] c.n.d.provider.DiscoveryJerseyProvider   : Using JSON decoding codec LegacyJacksonJson
2023-05-18T11:54:38.370+08:00  INFO 27992 --- [  restartedMain] c.n.d.provider.DiscoveryJerseyProvider   : Using XML encoding codec XStreamXml
2023-05-18T11:54:38.370+08:00  INFO 27992 --- [  restartedMain] c.n.d.provider.DiscoveryJerseyProvider   : Using XML decoding codec XStreamXml
2023-05-18T11:54:38.472+08:00  INFO 27992 --- [  restartedMain] c.n.eureka.cluster.PeerEurekaNodes       : Replica node URL:  http://127.0.0.1:9000/eureka/
2023-05-18T11:54:38.477+08:00  INFO 27992 --- [  restartedMain] c.n.e.registry.AbstractInstanceRegistry  : Finished initializing remote region registries. All known remote regions: []
2023-05-18T11:54:38.478+08:00  INFO 27992 --- [  restartedMain] c.n.eureka.DefaultEurekaServerContext    : Initialized
2023-05-18T11:54:38.490+08:00  INFO 27992 --- [  restartedMain] o.s.b.a.e.web.EndpointLinksResolver      : Exposing 1 endpoint(s) beneath base path '/actuator'
2023-05-18T11:54:38.538+08:00  INFO 27992 --- [  restartedMain] o.s.c.n.e.s.EurekaServiceRegistry        : Registering application EUREKA-SERVER with eureka with status UP
2023-05-18T11:54:38.552+08:00  INFO 27992 --- [      Thread-15] o.s.c.n.e.server.EurekaServerBootstrap   : isAws returned false
2023-05-18T11:54:38.553+08:00  INFO 27992 --- [      Thread-15] o.s.c.n.e.server.EurekaServerBootstrap   : Initialized server context
2023-05-18T11:54:38.553+08:00  INFO 27992 --- [      Thread-15] c.n.e.r.PeerAwareInstanceRegistryImpl    : Got 1 instances from neighboring DS node
2023-05-18T11:54:38.553+08:00  INFO 27992 --- [      Thread-15] c.n.e.r.PeerAwareInstanceRegistryImpl    : Renew threshold is: 1
2023-05-18T11:54:38.553+08:00  INFO 27992 --- [      Thread-15] c.n.e.r.PeerAwareInstanceRegistryImpl    : Changing status to UP
2023-05-18T11:54:38.558+08:00  INFO 27992 --- [      Thread-15] e.s.EurekaServerInitializerConfiguration : Started Eureka Server
2023-05-18T11:54:38.567+08:00  INFO 27992 --- [  restartedMain] o.s.b.w.embedded.tomcat.TomcatWebServer  : Tomcat started on port(s): 9000 (http) with context path ''
2023-05-18T11:54:38.568+08:00  INFO 27992 --- [  restartedMain] .s.c.n.e.s.EurekaAutoServiceRegistration : Updating port to 9000
2023-05-18T11:54:38.664+08:00  INFO 27992 --- [  restartedMain] com.xu.eureka.EurekaApplication          : Started EurekaApplication in 4.386 seconds (process running for 4.887)