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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com.xu.eureka.EurekaApplication
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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:\SoureCode\Learn\eureka-server\target\classes started by xuyq in E:\SoureCode\Learn\eureka-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)
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