标签:SpringCloud boot eureka 2020 7001 org Eureka com cloud
Eureka服务注册与发现
1、Eureka基础知识
2、单机Eureka构建步骤
2.1 新建服务注册中心(eurekaServer端)
1、新建cloud-eureka-server7001模块
Eureka1.X和2.X的对比说明
2、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.liukai.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-eureka-server7001</artifactId>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>com.liukai.springcloud</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
</dependencies>
</project>
3、application.yml
server:
port: 7001
eureka:
instance:
hostname: localhost #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不想注册中心注册自己
fetch-registry: false #false表示自己端就是注册中心,我的职责就是维护服务器实例,并不需要去检索服务
service-url:
# 设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址。
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/ # 单机版
4、主启动类EurekaMain7001
package com.liukai.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
/**
* @author liukai
* @version 1.0.0
* @ClassName EurekaMain7001.java
* @Description TODO
* @createTime 2021年03月20日 16:00:00
*/
@SpringBootApplication
@EnableEurekaServer // 表明7001这个模块是一个服务注册中心
public class EurekaMain7001 {
public static void main(String[] args) {
SpringApplication.run(EurekaMain7001.class);
}
}
5、启动:
2.2 EurekaClient端cloud-provider-payment8001将注册进EurekaServer7001成为服务提供者provider
1、修改cloud-provider-payment8001的pom.xml,添加如下
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server Eureka客户端-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
2、修改cloud-provider-payment8001的yml文件,修改为以下
server:
port: 8001
spring:
application:
name: cloud-payment-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: org.gjt.mm.mysql.Driver
url: jdbc:mysql://localhost:3306/cloud2020?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: root
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: com.liukai.springcloud.entities # 所有Entity 别名类所在包
eureka:
client:
register-with-eureka: true
fetchRegistry: true
service-url:
defaultZone: http://localhost:7001/eureka
3、cloud-provider-payment8001的主启动类添加 @EnableEurekaClient 注解
4、启动测试:先启动7001,再启动8001
可以发现cloud-payment-service注册成功了
2.3 EurekaClient端cloud-consumer-order80注册进EurekaServer成为服务消费者consumer
1、修改cloud-consumer-order80的pom.xml,添加如下代码
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
2、修改cloud-consumer-order80的yml,修改为如下
server:
port: 80
spring:
application:
name: cloud-order-service
# 需要先搭建好EurekaServer后在用得着这个
eureka:
client:
# 表示是否要将自己注册进EurekaServer,默认为true
register-with-eureka: true
# 是否从EurekaServer中抓取已有信息,默认为true。单节点无所谓,集群必须设置true才能配合Ribbon使用负载均衡。
fetchRegistry: true
service-url:
defaultZone: http://localhost:7001/eureka
3、cloud-consumer-order80的主启动类添加 @EnableEurekaClient 注解
4、启动测试:先启动7001,在启动8001,最后启动80
cloud-order-service注册成功
3、集群Eureka构建步骤
Eureka集群原理说明
解决办法:搭建Eureka注册中心集群,实现负载均衡+故障容错
3.1 参考cloud-eureka-server7001新建cloud-eureka-server7002
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">
<parent>
<artifactId>cloud2020</artifactId>
<groupId>com.liukai.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-eureka-server7002</artifactId>
<dependencies>
<!-- https://mvnrepository.com/artifact/org.springframework.cloud/spring-cloud-starter-eureka-server -->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<dependency>
<groupId>com.liukai.springcloud</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-web -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-devtools -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<!-- https://mvnrepository.com/artifact/org.projectlombok/lombok -->
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<!-- https://mvnrepository.com/artifact/org.springframework.boot/spring-boot-starter-test -->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
</dependencies>
</project>
2、修改映射配置,找到C:\Windows\System32\drivers\etc路径下的hosts文件
在末尾添加以下代码,表示将eureka7001.com等映射成为127.0.0.1
127.0.0.1 eureka7001.com
127.0.0.1 eureka7002.com
127.0.0.1 eureka7003.com
3、7002的application.yml
server:
port: 7002
eureka:
instance:
hostname: eureka7002.com #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不想注册中心注册自己
fetch-registry: false #false表示自己端就是注册中心,我的职责就是维护服务器实例,并不需要去检索服务
service-url:
# 设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址。
defaultZone: http://eureka7001.com:7001/eureka/ # 集群版
4、7001的application.yml修改为
server:
port: 7001
eureka:
instance:
hostname: eureka7001.com #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不想注册中心注册自己
fetch-registry: false #false表示自己端就是注册中心,我的职责就是维护服务器实例,并不需要去检索服务
service-url:
# 设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址。
defaultZone: http://eureka7002.com:7002/eureka/ # 集群版,相互守望
5、cloud-eureka-server7002的主启动类EurekaMain7002
package com.liukai.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
/**
* @author liukai
* @version 1.0.0
* @ClassName EurekaMain7002.java
* @Description TODO
* @createTime 2021年03月20日 17:30:00
*/
@SpringBootApplication
@EnableEurekaServer // 表明7001这个模块是一个服务注册中心
public class EurekaMain7002 {
public static void main(String[] args) {
SpringApplication.run(EurekaMain7002.class);
}
}
6、修改8001和80的yml文件,将defaultZone修改为以下
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka
7、测试:依次启动7001,7002,8001,80
因为将eureka7001.com和eureka7002.com都映射到了localhost,所以直接访问http://eureka7001.com:7001/和http://eureka7002.com:7002/,可以发现,7001和7002都启动成功了,并且相互守望,8001和80也都注册进了7001和7002。
获取数据也成功
3.2 支付服务提供者8001集群环境构建
1、参考cloud-provider-payment8001新建cloud-provider-payment8002
2、cloud-provider-payment8002的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.liukai.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-provider-payment8002</artifactId>
<dependencies>
<!-- eureka-client-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
</dependency>
<!-- 引入公共api模块-->
<dependency>
<groupId>com.liukai.springcloud</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</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.mybatis.spring.boot</groupId>
<artifactId>mybatis-spring-boot-starter</artifactId>
</dependency>
<dependency>
<groupId>com.alibaba</groupId>
<artifactId>druid-spring-boot-starter</artifactId>
<version>1.1.10</version>
</dependency>
<!--mysql-connector-java-->
<dependency>
<groupId>mysql</groupId>
<artifactId>mysql-connector-java</artifactId>
</dependency>
<!--jdbc-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-jdbc</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>
3、cloud-provider-payment8002的yml
server:
port: 8002
spring:
application:
name: cloud-payment-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource
driver-class-name: org.gjt.mm.mysql.Driver
url: jdbc:mysql://localhost:3306/cloud2020?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: root
mybatis:
mapper-locations: classpath:mapper/*.xml
type-aliases-package: com.liukai.springcloud.entities # 所有Entity 别名类所在包
eureka:
client:
register-with-eureka: true
fetchRegistry: true
service-url:
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka #集群版
#defaultZone: http://localhost:7001/eureka
4、将8001的以下文件拷贝到8002对应的位置
5、将PaymentMain8001修改为PaymentMain8002
package com.liukai.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
/**
* @author liukai
* @version 1.0.0
* @ClassName PaymentMain8001.java
* @Description TODO
* @createTime 2021年03月19日 16:47:00
*/
@SpringBootApplication
@EnableEurekaClient
public class PaymentMain8002 {
public static void main(String[] args) {
SpringApplication.run(PaymentMain8002.class);
}
}
6、测试8002能否访问成功
7、负载均衡
- 修改80端口的OrderController,即将PAYMENT_URL 修改为以下
// 将地址修改为服务的地址,而不是指定某个端口号
public static final String PAYMENT_URL = "http://CLOUD-PAYMENT-SERVICE";
- 修改80端口的java配置类 ApplicationContextConfig ,使用@LoadBalanced注解赋予RestTemplate负载均衡的能力。
// 注入RestTemplate
@Bean
@LoadBalanced
public RestTemplate getRestTemplate(){
return new RestTemplate();
}
8、测试:依次启动7001,7002,8001,8002,80,访问http://localhost/consumer/payment/get/31,发现每次查询的端口号都在8001和8002轮询,每次都不一样
Ribbon和Eureka整合后Consumer可以直接调用服务而不用再关心地址和端口号,且该服务还有负载功能了
4、actuator微服务信息完善
1、修改8001和8002的yml中的eureka部分,添加instance。8001的instance-id为payment8001;8002的instance-id为payment8002。
eureka:
client:
register-with-eureka: true
fetchRegistry: true
service-url:
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka #集群版
#defaultZone: http://localhost:7001/eureka
instance:
instance-id: payment8002
prefer-ip-address: true # 显示ip
可以发现,8001和8002的服务名称发生改变,而且鼠标悬停在payment8001上,页面左下角会显示服务的ip地址和端口号。
5、服务发现Discovery
对于注册进eureka里面的微服务,可以通过服务发现来获得该服务的信息
1、修改cloud-provider-payment8001的Controller,添加如下内容,8002也做相同操作
// 服务发现Discovery
@Resource
private DiscoveryClient discoveryClient;
@GetMapping("/payment/discovery")
public Object discovery(){
List<String> services = discoveryClient.getServices();
services.forEach(System.out::println);
List<ServiceInstance> instances = discoveryClient.getInstances("CLOUD-PAYMENT-SERVICE");
for (ServiceInstance instance : instances) {
log.info("ServiceId:" + instance.getServiceId() + ",Port:" + instance.getPort() + ",Host:" + instance.getHost());
}
return discoveryClient;
}
2、测试,访问http://localhost:8001/payment/discovery,8002同样的可以
6、Eureka自我保护机制
1、故障现象
2、导致原因
一句话:某时刻某一个微服务不可用了,Eureka不会立刻清理,依旧会对该微服务的信息进行保存。属于CAP里面的AP分支
3、怎么禁止自我保护(一般生产环境中不会禁止自我保护)
- 注册中心eureakeServer端7001:出厂默认,自我保护机制是开启的。修改7001的yml文件,将eureka修改为以下。
eureka:
instance:
hostname: eureka7001.com #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不想注册中心注册自己
fetch-registry: false #false表示自己端就是注册中心,我的职责就是维护服务器实例,并不需要去检索服务
service-url:
# 设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址。
defaultZone: http://eureka7002.com:7002/eureka/ # 集群版,相互守望
server:
enable-self-preservation: false # 禁用自我保护模式
eviction-interval-timer-in-ms: 2000 # 将默认保护时间90秒改为2秒
- 生产者客户端eureakeClient端8001:修改8001的yml文件,将eureka修改为以下。
eureka:
client:
register-with-eureka: true
fetchRegistry: true
service-url:
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka #集群版
#defaultZone: http://localhost:7001/eureka
instance:
instance-id: payment8001 # 设置主机名称 http://localhost:8002/actuator/health健康检查
prefer-ip-address: true # 访问路径可以显示IP地址
# Eureka客户端向服务端发送心跳的时间间隔,单位为秒(默认是30秒)
lease-expiration-duration-in-seconds: 1
# Eureka服务端在收到最后一次心跳后等待时间上限,单位为秒(默认是30秒),超时将剔除服务
lease-renewal-interval-in-seconds: 2
- 测试,关闭所有服务,先启动7001,再启动8001。发现7001的eureka关闭了自我保护机制,8001也成功入驻。
* 关闭8001服务,7001的eureka中立马清理掉8001
此笔记的视频地址:尚硅谷SprngCloud(H版&alibaba框架开发教程(大牛讲授SpringCloud))
标签:SpringCloud,boot,eureka,2020,7001,org,Eureka,com,cloud 来源: https://blog.csdn.net/Cool_Boy23955/article/details/115028975
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