Spring Cloud负载均衡
- 客户端负载均衡
- 服务端负载均衡
- 调度算法
- 特性
客户端负载均衡
- 优势
稳定性高 - 不足
升级成本高
服务端负载均衡
- 优势
统一维护,成本低 - 不足
一旦故障,影响大
调度算法
- 先来先服务(First Come First Served)
- 最早截止时间优先(Earliest deadline first)
- 最短保留时间优先(Shortest remaining time first)
- 固定优先级(Fixed Proority)
- 轮训(Round-Robin)
- 多级别队列(Multilevel Queue)
非对称负载(Asymmetric load)
- 分布式拒绝服务攻击保护
- 直接服务返回
- 健康检查
- 优先级队列
配置ribbon client与service provider直连方式
1.service provider端
我的Maven配置
<?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">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>spring-cloud-lesson-6-service-provider</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-cloud-lesson-6-service-provider</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<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-client</artifactId>
</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.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2.配置application.properties文件
##服务提供方
spring.application.name=spring-cloud-service-provider
##服务端口
server.port=9090
##关闭注册
eureka.client.enabled=false
3.创建测试类
package com.example.web.controller;
import com.example.domain.User;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RequestParam;
import org.springframework.web.bind.annotation.RestController;
/**
* 服务提供方
*/
@RestController
public class ServiceProviderController {
@GetMapping("/greeting")
public String greeting(@RequestParam User user){
return "Greeting,"+user;
}
}
ribbon client端配置
1.我的Maven配置
<?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">
<modelVersion>4.0.0</modelVersion>
<parent>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-parent</artifactId>
<version>2.1.3.RELEASE</version>
<relativePath/> <!-- lookup parent from repository -->
</parent>
<groupId>com.example</groupId>
<artifactId>spring-cloud-lesson-6</artifactId>
<version>0.0.1-SNAPSHOT</version>
<name>spring-cloud-lesson-6</name>
<description>Demo project for Spring Boot</description>
<properties>
<java.version>1.8</java.version>
<spring-cloud.version>Greenwich.SR1</spring-cloud.version>
</properties>
<dependencies>
<dependency>
<groupId>org.springframework.boot</groupId>
<artifactId>spring-boot-starter-actuator</artifactId>
</dependency>
<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-client</artifactId>
</dependency>
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</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.springframework.boot</groupId>
<artifactId>spring-boot-maven-plugin</artifactId>
</plugin>
</plugins>
</build>
</project>
2.配置application.properties
##服务提供方
spring.application.name=spring-cloud-ribbon-client
##服务端口
server.port=8080
##关闭注册
eureka.client.enabled=false
##服务提供方主机
service-provider.host=localhost
##提供方端口
service-provider.port=9090
service-provider.name=spring-cloud-service-provider
###配置服务提供方的ribbon
spring-cloud-service-provider.ribbon.listOfServers=\
http://${service-provider.host}:${service-provider.port}
3.创建连接测试类
package com.example.web.Controller;
import com.example.domain.User;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.beans.factory.annotation.Value;
import org.springframework.web.bind.annotation.GetMapping;
import org.springframework.web.bind.annotation.RestController;
import org.springframework.web.client.RestTemplate;
@RestController
public class ClientController {
@Autowired
private RestTemplate restTemplate;
@Value("${service-provider.host}")
private String serviceProviderHost;
@Value("${service-provider.port}")
private Integer serviceProviderPort;
@GetMapping("")
public String index(){
User user=new User();
user.setId(1L);
user.setName("ss");
return restTemplate.postForObject("http://"+serviceProviderHost+":"+serviceProviderPort+"/greeting",
user,String.class);
}
}
Netflix Ribbon
1.引入Maven依赖
<dependency>
<groupId>org.springframework.cloud</groupId>
<artifactId>spring-cloud-starter-netflix-ribbon</artifactId>
</dependency>
2.激活Ribbon客户端@RibbonClients({@RibbonClient(name="spring-cloud-service-provider")})
3.配置Ribbon客户端application.properties
##服务提供方
spring.application.name=spring-cloud-ribbon-client
##服务端口
server.port=8080
##关闭注册
eureka.client.enabled=false
##服务提供方主机
service-provider.host=localhost
##提供方端口
service-provider.port=9090
service-provider.name=spring-cloud-service-provider
###配置服务提供方的ribbon
spring-cloud-service-provider.ribbon.listOfServers=\
http://${service-provider.host}:${service-provider.port}