集群Eureka构建
1. Eureka集群原理说明
问题：微服务RPC远程服务调用最核心的是什么
高可用，试想你的注册中心只有一个only one， 它出故障了那就呵呵(￣▽￣)"了，会导致整个为服务环境不可用，所以
解决办法：搭建Eureka注册中心集群 ，实现负载均衡+故障容错
2. EurekaServer集群环境构建步骤
2.1 参考cloud-eureka-server7001
2.2 新建cloud-eureka-server7002
<?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>mscloud03</artifactId>
<groupId>com.atguigu.springcloud</groupId>
<version>1.0-SNAPSHOT</version>
</parent>
<modelVersion>4.0.0</modelVersion>
<artifactId>cloud-eureka-server7002</artifactId>
<dependencies>
<!--eureka-server-->
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
</dependency>
<!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
<dependency>
<groupId>com.atguigu.springcloud</groupId>
<artifactId>cloud-api-commons</artifactId>
<version>${project.version}</version>
</dependency>
<!--boot web actuator-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-web</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<!--一般通用配置-->
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-devtools</artifactId>
<scope>runtime</scope>
<optional>true</optional>
</dependency>
<dependency>
<groupId>org.projectlombok</groupId>
<artifactId>lombok</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-test</artifactId>
<scope>test</scope>
</dependency>
<dependency>
<groupId>junit</groupId>
<artifactId>junit</artifactId>
</dependency>
</dependencies>
</project>
3. 修改映射配置
找到C:\Windows\System32\drivers\etc路径下的hosts文件
修改映射配置添加进hosts文件
127.0.0.1 eureka7001.com
127.0.0.1 eureka7002.com
写YML(以前单机)
server:
port: 7001
eureka:
instance:
hostname: localhost #eureka服务端的实例名称
client:
#false表示不向注册中心注册自己。
register-with-eureka: false
#false表示自己端就是注册中心，我的职责就是维护服务实例，并不需要去检索服务
fetch-registry: false
service-url:
#设置与Eureka Server交互的地址查询服务和注册服务都需要依赖这个地址。
defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
7001
server:
port: 7001
eureka:
instance:
hostname: eureka7001.com #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不向注册中心注册自己。
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实例，并不需要去检索服务
service-url:
defaultZone: http://eureka7002.com:7002/eureka/
7002
server:
port: 7002
eureka:
instance:
hostname: eureka7002.com #eureka服务端的实例名称
client:
register-with-eureka: false #false表示不向注册中心注册自己。
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实例，并不需要去检索服务
service-url:
defaultZone: http://eureka7001.com:7001/eureka/
主启动
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.server.EnableEurekaServer;
/**
* @auther zzyy
* @create 2020-01-29 16:14
*/
@SpringBootApplication
@EnableEurekaServer
public class EurekaMain7002
{
public static void main(String[] args)
{
SpringApplication.run(EurekaMain7002.class,args);
}
}
将支付服务8001微服务发布到上面2台Eureka集群配置中
server:
port: 8001
spring:
application:
name: cloud-payment-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource # 当前数据源操作类型
driver-class-name: org.gjt.mm.mysql.Driver # mysql驱动包
url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 123456
eureka:
client:
#表示是否将自己注册进EurekaServer默认为true。
register-with-eureka: true
#是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
fetchRegistry: true
service-url:
#defaultZone: http://localhost:7001/eureka
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版
mybatis:
mapperLocations: classpath:mapper/*.xml
type-aliases-package: com.atguigu.springcloud.entities # 所有Entity别名类所在包
将订单服务80微服务发布到上面2台Eureka集群配置中
server:
port: 80
spring:
application:
name: cloud-order-service
eureka:
client:
#表示是否将自己注册进EurekaServer默认为true。
register-with-eureka: true
#是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
fetchRegistry: true
service-url:
#defaultZone: http://localhost:7001/eureka
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版
测试01
1. 先要启动EurekaServer，7001/7002服务
2. 再要启动服务提供者provider，8001
3. 再要启动消费者，80
4.http://localhost/consumer/payment/get/31
5.ok
支付服务提供者8001集群环境构建
参考cloud-provider-payment8001
新建cloud-provider-payment8002
改POM
<?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>mscloud03</artifactId>
<groupId>com.atguigu.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>
<dependency><!-- 引入自己定义的api通用包，可以使用Payment支付Entity -->
<groupId>com.atguigu.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>
写YML
server:
port: 8002
spring:
application:
name: cloud-payment-service
datasource:
type: com.alibaba.druid.pool.DruidDataSource # 当前数据源操作类型
driver-class-name: org.gjt.mm.mysql.Driver # mysql驱动包
url: jdbc:mysql://localhost:3306/db2019?useUnicode=true&characterEncoding=utf-8&useSSL=false
username: root
password: 123456
eureka:
client:
#表示是否将自己注册进EurekaServer默认为true。
register-with-eureka: true
#是否从EurekaServer抓取已有的注册信息，默认为true。单节点无所谓，集群必须设置为true才能配合ribbon使用负载均衡
fetchRegistry: true
service-url:
defaultZone: http://eureka7001.com:7001/eureka,http://eureka7002.com:7002/eureka # 集群版
#defaultZone: http://localhost:7001/eureka # 单机版
mybatis:
mapperLocations: classpath:mapper/*.xml
type-aliases-package: com.atguigu.springcloud.entities # 所有Entity别名类所在包
主启动
package com.atguigu.springcloud;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
/**
* @auther zzyy
* @create 2020-01-27 19:50
*/
@SpringBootApplication
@EnableEurekaClient
public class PaymentMain8002
{
public static void main(String[] args)
{
SpringApplication.run(PaymentMain8002.class,args);
}
}
业务类
直接从8001粘
修改8001/8002的Controller
8001
package com.atguigu.springcloud.controller;
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
/**
* @auther zzyy
* @create 2020-01-27 21:17
*/
@RestController
@Slf4j
public class PaymentController
{
@Value("${server.port}")
private String serverPort;
@Resource
private PaymentService paymentService;
@PostMapping(value = "/payment/create")
public CommonResult create(@RequestBody Payment payment)
{
int result = paymentService.create(payment);
log.info("*****插入操作返回结果:" + result);
if(result > 0)
{
return new CommonResult(200,"插入成功,返回结果"+result+"\t 服务端口："+serverPort,payment);
}else{
return new CommonResult(444,"插入失败",null);
}
}
@GetMapping(value = "/payment/get/{id}")
public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id)
{
Payment payment = paymentService.getPaymentById(id);
log.info("*****查询结果:{}",payment);
if (payment != null) {
return new CommonResult(200,"查询成功"+"\t 服务端口："+serverPort,payment);
}else{
return new CommonResult(444,"没有对应记录,查询ID: "+id,null);
}
}
}
8002
package com.atguigu.springcloud.controller;
import com.atguigu.springcloud.entities.CommonResult;
import com.atguigu.springcloud.entities.Payment;
import com.atguigu.springcloud.service.PaymentService;
import lombok.extern.slf4j.Slf4j;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.*;
import javax.annotation.Resource;
/**
* @auther zzyy
* @create 2020-01-27 21:17
*/
@RestController
@Slf4j
public class PaymentController
{
@Value("${server.port}")
private String serverPort;
@Resource
private PaymentService paymentService;
@PostMapping(value = "/payment/create")
public CommonResult create(@RequestBody Payment payment)
{
int result = paymentService.create(payment);
log.info("*****新增结果:" + result);
if(result > 0)
{
return new CommonResult(200,"插入成功,返回结果"+result+"\t 服务端口："+serverPort,payment);
}else{
return new CommonResult(444,"插入失败",null);
}
}
@GetMapping(value = "/payment/get/{id}")
public CommonResult<Payment> getPaymentById(@PathVariable("id") Long id)
{
Payment payment = paymentService.getPaymentById(id);
log.info("*****查询结果:{}",payment);
if (payment != null) {
return new CommonResult(200,"查询成功"+"\t 服务端口："+serverPort,payment);
}else{
return new CommonResult(444,"没有对应记录,查询ID: "+id,null);
}
}
}
负载均衡
bug
订单服务访问地址不能写死
//public static final String PAYMENT_SRV = "http://localhost:8001";
// 通过在eureka上注册过的微服务名称调用
public static final String PAYMENT_SRV = "http://CLOUD-PAYMENT-SERVICE";
使用@LoadBalanced注解赋予RestTemplate负载均衡的能力
ApplicationContextBean
package com.atguigu.springcloud.config;
import org.springframework.cloud.client.loadbalancer.LoadBalanced;
import org.springframework.context.annotation.Bean;
import org.springframework.context.annotation.Configuration;
import org.springframework.web.client.RestTemplate;
/**
* @auther zzyy
* @create 2020-01-28 16:22
*/
@Configuration
public class ApplicationContextBean
{
@Bean
@LoadBalanced //使用@LoadBalanced注解赋予RestTemplate负载均衡的能力
public RestTemplate getRestTemplate()
{
return new RestTemplate();
}
}
提前说一下Ribbon的负载均衡功能
测试02
1. 先要启动EurekaServer，7001/7002服务
2. 再要启动服务提供者provider，8001/8002服务
3. http://localhost/consumer/payment/get/31
4. 结果
4.1 负载均衡效果达到
4.2 8001/8002端口交替出现
5. 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。O(∩_∩)O
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