搭建springcloud的demo之Ribbon负载均衡(五)

亦凉 2022-03-10 14:42 321阅读 0赞

## Ribbon的负载均衡算法 ##

**默认简单轮询算法:一台服务器一次**

**Ribbon在工作时分成两步**  
**第一步先选择EurekaServer,它优先选择在同一个区域内负载较少的server;**  
**第二步再根据用户指定的策略,在从server取到的服务注册列表中选择一个地址;**

**参考microservicecloud-provider-dept-8001,新建两份,分别命名为8002,8003**

<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>
      <parent>
        <groupId>com.yt.springcloud</groupId>
        <artifactId>microservicecloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
      </parent>
      <artifactId>microservicecloud-provider-dept-8002</artifactId>
      
      <dependencies>
      
      
      	<dependency>
      		<groupId>com.yt.springcloud</groupId> 
      		<artifactId>microservicecloud-api</artifactId>
      		<version>${project.version}</version>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>junit</groupId>
      		<artifactId>junit</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>mysql</groupId>
      		<artifactId>mysql-connector-java</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>com.alibaba</groupId>
      		<artifactId>druid</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.mybatis.spring.boot</groupId>
      		<artifactId>mybatis-spring-boot-starter</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.boot</groupId>
      		<artifactId>spring-boot-starter-jetty</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.boot</groupId>
      		<artifactId>spring-boot-starter-web</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.boot</groupId>
      		<artifactId>spring-boot-starter-test</artifactId>
      	</dependency>
      	
      	
      	 
      	<dependency>
      		<groupId>org.springframework</groupId>
      		<artifactId>springloaded</artifactId>
      	</dependency>
      	<dependency>
      		<groupId>org.springframework.boot</groupId>
      		<artifactId>spring-boot-devtools</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.cloud</groupId>
      		<artifactId>spring-cloud-starter-eureka</artifactId>
      	</dependency>
      	<dependency>
      		<groupId>org.springframework.cloud</groupId>
      		<artifactId>spring-cloud-starter-config</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.boot</groupId> 
      		<artifactId>spring-boot-starter-actuator</artifactId>
      	</dependency>
      	
      </dependencies>
      
    </project>

<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>
      <parent>
        <groupId>com.yt.springcloud</groupId>
        <artifactId>microservicecloud</artifactId>
        <version>0.0.1-SNAPSHOT</version>
      </parent>
      <artifactId>microservicecloud-provider-dept-8003</artifactId>
      
      <dependencies>
      
      
      	<dependency>
      		<groupId>com.yt.springcloud</groupId> 
      		<artifactId>microservicecloud-api</artifactId>
      		<version>${project.version}</version>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>junit</groupId>
      		<artifactId>junit</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>mysql</groupId>
      		<artifactId>mysql-connector-java</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>com.alibaba</groupId>
      		<artifactId>druid</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.mybatis.spring.boot</groupId>
      		<artifactId>mybatis-spring-boot-starter</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.boot</groupId>
      		<artifactId>spring-boot-starter-jetty</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.boot</groupId>
      		<artifactId>spring-boot-starter-web</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.boot</groupId>
      		<artifactId>spring-boot-starter-test</artifactId>
      	</dependency>
      	
      	
      	 
      	<dependency>
      		<groupId>org.springframework</groupId>
      		<artifactId>springloaded</artifactId>
      	</dependency>
      	<dependency>
      		<groupId>org.springframework.boot</groupId>
      		<artifactId>spring-boot-devtools</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.cloud</groupId>
      		<artifactId>spring-cloud-starter-eureka</artifactId>
      	</dependency>
      	<dependency>
      		<groupId>org.springframework.cloud</groupId>
      		<artifactId>spring-cloud-starter-config</artifactId>
      	</dependency>
      	
      	 
      	<dependency>
      		<groupId>org.springframework.boot</groupId> 
      		<artifactId>spring-boot-starter-actuator</artifactId>
      	</dependency>
      	
      </dependencies>
      
    </project>

**新建8002/8003数据库,各自微服务分别连接各自的数据库**

DROP DATABASE IF EXISTS cloudDB02;
    CREATE DATABASE cloudDB02 CHARACTER SET UTF8;
    USE cloudDB02;
    CREATE TABLE dept(
    	deptno BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    	dname VARCHAR(60),
    	db_source VARCHAR(60)
    );
    
    INSERT INTO dept(dname,db_source)VALUES ('开发部',DATABASE());
    INSERT INTO dept(dname,db_source)VALUES ('人事部',DATABASE());
    INSERT INTO dept(dname,db_source)VALUES ('财务部',DATABASE());
    INSERT INTO dept(dname,db_source)VALUES ('市场部',DATABASE());
    INSERT INTO dept(dname,db_source)VALUES ('运维部',DATABASE());
    
    SELECT * FROM dept;

DROP DATABASE IF EXISTS cloudDB03;
    CREATE DATABASE cloudDB03 CHARACTER SET UTF8;
    USE cloudDB03;
    CREATE TABLE dept(
    	deptno BIGINT NOT NULL PRIMARY KEY AUTO_INCREMENT,
    	dname VARCHAR(60),
    	db_source VARCHAR(60)
    );
    
    INSERT INTO dept(dname,db_source)VALUES ('开发部',DATABASE());
    INSERT INTO dept(dname,db_source)VALUES ('人事部',DATABASE());
    INSERT INTO dept(dname,db_source)VALUES ('财务部',DATABASE());
    INSERT INTO dept(dname,db_source)VALUES ('市场部',DATABASE());
    INSERT INTO dept(dname,db_source)VALUES ('运维部',DATABASE());
    
    SELECT * FROM dept;

**修改8002的yml**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70]

server:
      port: 8002                                         # 当前微服务的端口
      
    mybatis:
      config-location: classpath:mybatis/mybatis.cfg.xml # mybatis配置文件所在路径
      type-aliases-package: com.yt.springcloud.entity    # 所有饿entity实体类所在包
      mapper-locations:
      - classpath:mybatis/mapper/**/*.xml                # mapper映射文件
    
    spring:
      application:
       name: microservicecloud-dept                      # 对外暴露的微服务的名字(很重要)
      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/cloudDB02        # 数据库名称
       username: root
       password: hannong
       dbcp2:
        min-idle: 5                                      # 数据库连接池的最小维持连接数 
        initial-size: 5                                  # 初始化连接数
        max-total: 5                                     # 最大连接数
        max-wait-millis: 200                             # 等待连接获取的最大超时时间
        
    eureka:
       client:   #客户端注册进eureka服务列表内
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/      #去注册中心的地址
          #defaultZone:7001,7002,7003 去注册中心的地址
       instance: 
          instance-id: microservicecloud-dept8002        #修改eureka的服务路径名称
          prefer-ip-address: true                        #访问路径可以显示ip地址
    
    info:
       app.name: yt-microservicecloud                    #
       company.name: www.yt.com                          #
       build.artifactId: $project.artifactId$            #
       build.version: $project.version$                  #

**修改8003的yml**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 1]

server:
      port: 8003                                         # 当前微服务的端口
      
    mybatis:
      config-location: classpath:mybatis/mybatis.cfg.xml # mybatis配置文件所在路径
      type-aliases-package: com.yt.springcloud.entity    # 所有饿entity实体类所在包
      mapper-locations:
      - classpath:mybatis/mapper/**/*.xml                # mapper映射文件
    
    spring:
      application:
       name: microservicecloud-dept                      # 对外暴露的微服务的名字(很重要)
      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/cloudDB03        # 数据库名称
       username: root
       password: hannong
       dbcp2:
        min-idle: 5                                      # 数据库连接池的最小维持连接数 
        initial-size: 5                                  # 初始化连接数
        max-total: 5                                     # 最大连接数
        max-wait-millis: 200                             # 等待连接获取的最大超时时间
        
    eureka:
       client:   #客户端注册进eureka服务列表内
        service-url:
          defaultZone: http://eureka7001.com:7001/eureka/,http://eureka7002.com:7002/eureka/,http://eureka7003.com:7003/eureka/      #去注册中心的地址
          #defaultZone:7001,7002,7003 去注册中心的地址
       instance: 
          instance-id: microservicecloud-dept8003        #修改eureka的服务路径名称
          prefer-ip-address: true                        #访问路径可以显示ip地址
    
    info:
       app.name: yt-microservicecloud                    #
       company.name: www.yt.com                          #
       build.artifactId: $project.artifactId$            #
       build.version: $project.version$                  #

**启动3个eureka集群配置区**  
**启动3个Dept微服务并各自测试通过**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 2]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 3]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 4]  
**启动microservicecloud-consumer-dept-80:[http://localhost:8003/dept/list][http_localhost_8003_dept_list]**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 5]  
**客户端通过Ribbon完成负载均衡并访问上一步的Dept微服务**

## 总结:Ribbon其实就是一个软负载均衡的客户端组件,它可以和其他所需请求的客户端结合使用,和eureka结合只是其中的一个实例; ##

## Ribbon核心组件IRule:根据特定算法中从服务列表中选取一个要访问的服务; ##

**默认的简单轮询算法,改成随机算法**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 6]

package com.yt.springcloud.cfgbeans;
    
    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;
    
    import com.netflix.loadbalancer.IRule;
    import com.netflix.loadbalancer.RandomRule;
    
    @Configuration//其实就是ApplicationContext.xml
    public class ConfigBean {
    	
    	/**
    	 * RestTemplate提供了多种便捷访问远程Http服务的方法
    	 * 是一种简单便捷的访问restful服务模板类,是Spring提供的用于访问Rest服务的客户端模板工具集
    	 * @return
    	 */
    	@Bean
    	@LoadBalanced//ribbon是客户端的负载均衡工具,所以在rest去访问微服务的时候,自带负载均衡,这个注解是开启负载均衡的
    	public RestTemplate getRestTemplate() {
    		return new RestTemplate();
    	}
    	
    	/**
    	 * 有显示的声明算法,就覆盖默认的轮询算法
    	 * @return
    	 */
    	@Bean
    	public IRule myRule() {
    		
    		//return new RoundRobinRule();//轮询算法
    		return new RandomRule();//随机算法
    	}
    
    }

## Ribbon自定义算法 ##

**修改microservicecloud-consumer-dept-80**  
**主启动类添加@RibbonClient**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 7]

package com.yt.springcloud;
    
    import org.springframework.boot.SpringApplication;
    import org.springframework.boot.autoconfigure.SpringBootApplication;
    import org.springframework.cloud.netflix.eureka.EnableEurekaClient;
    import org.springframework.cloud.netflix.ribbon.RibbonClient;
    
    import com.yt.myrule.MySelfRule;
    
    @SpringBootApplication
    @EnableEurekaClient
    //在启动该微服务的时候就能去加载我们的自定义Ribbon配置类，从而使配置生效
    @RibbonClient(name="MICROSERVICECLOUD-DEPT",configuration=MySelfRule.class)
    public class DeptConsumer80_App {
    	
    	public static void main(String[] args) {
    		SpringApplication.run(DeptConsumer80_App.class, args);
    	}
    
    }

**注意配置细节**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 8]

package com.yt.myrule;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import com.netflix.loadbalancer.IRule;
    import com.netflix.loadbalancer.RandomRule;
    
    //自定义负载均衡算法类
    @Configuration
    public class MySelfRule {
    	
    	@Bean
    	public IRule myRule() {
    		return new RandomRule();//Ribbon默认是轮询,我自定义为随机
    	}
    
    }

**启动3个eureka集群和8001,8002,8003,80等**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 9]  
**自定义规则深度解析**  
**创建RandomRule\_YT**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 10]

package com.yt.myrule;
    
    import java.util.List;
    
    import com.netflix.client.config.IClientConfig;
    import com.netflix.loadbalancer.AbstractLoadBalancerRule;
    import com.netflix.loadbalancer.ILoadBalancer;
    import com.netflix.loadbalancer.Server;
    
    public class RandomRule_YT extends AbstractLoadBalancerRule{
    
    	// total = 0 // 当total==5以后，我们指针才能往下走，
    	// index = 0 // 当前对外提供服务的服务器地址，
    	// total需要重新置为零，但是已经达到过一个5次，我们的index = 1
    	// 分析：我们5次，但是微服务只有8001 8002 8003 三台，OK？
    	// 
    	
    	private int total = 0; 			// 总共被调用的次数，目前要求每台被调用5次
    	private int currentIndex = 0;	// 当前提供服务的机器号
    
    	/**
    	 * 返回具体服务的服务器(是8001还是8002还是8003) 
    	 * @param lb
    	 * @param key
    	 * @return
    	 */
    	public Server choose(ILoadBalancer lb, Object key)
    	{
    		if (lb == null) {
    			return null;
    		}
    		Server server = null;
    
    		while (server == null) {
    			if (Thread.interrupted()) {
    				return null;
    			}
    			List<Server> upList = lb.getReachableServers();//活着的,可以对外提供服务的服务器
    			List<Server> allList = lb.getAllServers();
    
    			int serverCount = allList.size();//得到服务器的台数
    			if (serverCount == 0) {//为0就不进去
    				/*
    				 * No servers. End regardless of pass, because subsequent passes only get more
    				 * restrictive.
    				 */
    				return null;
    			}
    
    //			int index = rand.nextInt(serverCount);// java.util.Random().nextInt(3);
    //			server = upList.get(index);
    
    			
    //			private int total = 0; 			// 总共被调用的次数，目前要求每台被调用5次
    //			private int currentIndex = 0;	// 当前提供服务的机器号
                if(total < 5)
                {
    	            server = upList.get(currentIndex);
    	            total++;
                }else {
    	            total = 0;
    	            currentIndex++;
    	            if(currentIndex >= upList.size())
    	            {
    	              currentIndex = 0;
    	            }
                }			
    			
    			
    			if (server == null) {
    				/*
    				 * The only time this should happen is if the server list were somehow trimmed.
    				 * This is a transient condition. Retry after yielding.
    				 */
    				Thread.yield();
    				continue;
    			}
    
    			if (server.isAlive()) {
    				return (server);
    			}
    
    			// Shouldn't actually happen.. but must be transient or a bug.
    			server = null;
    			Thread.yield();
    		}
    
    		return server;
    
    	}
    
    	@Override
    	public Server choose(Object key)
    	{
    		return choose(getLoadBalancer(), key);
    	}
    
    	@Override
    	public void initWithNiwsConfig(IClientConfig clientConfig)
    	{
    		// TODO Auto-generated method stub
    
    	}
    
    }

**修改MySelfRule类的返回类**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 11]

package com.yt.myrule;
    
    import org.springframework.context.annotation.Bean;
    import org.springframework.context.annotation.Configuration;
    
    import com.netflix.loadbalancer.IRule;
    
    //自定义负载均衡算法类
    @Configuration
    public class MySelfRule {
    	
    	@Bean
    	public IRule myRule() {
    		return new RandomRule_YT();//Ribbon默认是轮询,我自定义为随机
    	}
    
    }

**启动3个eureka集群,8001,8002,8003,80等**  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 12]

## 总结 ##

![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 13]  
翻译于尚硅谷周阳老师:[https://www.bilibili.com/video/av22613028?from=search&seid=11377756339718254280][https_www.bilibili.com_video_av22613028_from_search_seid_11377756339718254280]

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70]: /images/20220310/ce58eeb95e004c3a8a4171ec2a19f367.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 1]: /images/20220310/ed887dc59b0f47119cb021148bd328c5.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 2]: /images/20220310/1fe313cd7f2a4403ad0e68d7efbd9271.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 3]: /images/20220310/b463923233894535b3b1fabf24116d61.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3l1YW50aW5nXw_size_16_color_FFFFFF_t_70 4]: /images/20220310/6f686a52617f4e1186643f2305c054ae.png
[http_localhost_8003_dept_list]: http://localhost:8003/dept/list
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[https_www.bilibili.com_video_av22613028_from_search_seid_11377756339718254280]: https://www.bilibili.com/video/av22613028?from=search&seid=11377756339718254280