SpringCloud负载均衡笔记

SpringCloud的负载均衡组件用的是Ribbon，这个东西就是服务消费者。它只是一个配置用的中转器，放在 Zuul 和 Eureka Client 之间用来转发的，它里面写了好多规则，用来指定负载的规则。

首先，Zuul：

application.yml

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:7087/eureka/

server:

  port:

spring:

  application:

    name: service-zuul

zuul:

  host:

    maxTotalConnections:

    maxPerRouteConnections:

  routes:

    api-a:

      path: /dbmeta/**

      serviceId: service-ribbon

    api-b:

      path: /kylin/**

      serviceId: service-kylin

ribbon:

  eureka:

    enabled: false

service-ribbon:

  ribbon:

    listOfServers: http://localhost:7088,http://localhost:7091

    ConnectTimeout: 10000

    ReadTimeout: 30000

    MaxTotalHttpConnections: 10000

    MaxConnectionsPerHost: 60000

Application

package com.shinho;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.boot.builder.SpringApplicationBuilder;

import org.springframework.cloud.netflix.eureka.EnableEurekaClient;

import org.springframework.cloud.netflix.zuul.EnableZuulProxy;

@EnableZuulProxy

@SpringBootApplication

public class DbzuulApplication {

    public static void main(String[] args) {

        SpringApplication.run(DbzuulApplication.class,args);

    }

}

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">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.shinho</groupId>

    <artifactId>dbzuul</artifactId>

    <version>0.0.1</version>

    <packaging>jar</packaging>

    <name>dbzuul</name>

    <description>Demo project for Spring Boot</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.0.0.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

        <spring-cloud.version>Finchley.M9</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>org.springframework.cloud</groupId>

            <artifactId>spring-cloud-starter-netflix-zuul</artifactId>

        </dependency>

        <dependency>

            <groupId>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-expression</artifactId>

            <version>4.3.14.RELEASE</version>

        </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>

    <repositories>

        <repository>

            <id>spring-snapshots</id>

            <name>Spring Snapshots</name>

            <url>https://repo.spring.io/snapshot</url>

            <snapshots>

                <enabled>true</enabled>

            </snapshots>

        </repository>

        <repository>

            <id>spring-milestones</id>

            <name>Spring Milestones</name>

            <url>https://repo.spring.io/milestone</url>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </repository>

    </repositories>

    <pluginRepositories>

        <pluginRepository>

            <id>spring-snapshots</id>

            <name>Spring Snapshots</name>

            <url>https://repo.spring.io/snapshot</url>

            <snapshots>

                <enabled>true</enabled>

            </snapshots>

        </pluginRepository>

        <pluginRepository>

            <id>spring-milestones</id>

            <name>Spring Milestones</name>

            <url>https://repo.spring.io/milestone</url>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </pluginRepository>

    </pluginRepositories>

</project>

然后，Ribbon客户端

application.yml

eureka:

  client:

    serviceUrl:

      defaultZone: http://localhost:7087/eureka

server:

  port: 7090

spring:

  application:

    name: service-ribbon

Config类

package com.config;

import org.springframework.cloud.netflix.ribbon.ZonePreferenceServerListFilter;

import org.springframework.context.annotation.Bean;

import org.springframework.context.annotation.Configuration;

import com.netflix.client.config.IClientConfig;

import com.netflix.loadbalancer.BestAvailableRule;

import com.netflix.loadbalancer.IPing;

import com.netflix.loadbalancer.IRule;

import com.netflix.loadbalancer.PingUrl;

import com.netflix.loadbalancer.Server;

import com.netflix.loadbalancer.ServerList;

import com.netflix.loadbalancer.ServerListSubsetFilter;

import com.shinho.DbribbonApplication;

@Configuration

public class MyConfig {

    @Bean

    public IRule ribbonRule() {

        return new BestAvailableRule();

    }

    @Bean

    public IPing ribbonPing() {

        return new PingUrl();

    }

    @Bean

    public ServerList<Server> ribbonServerList(IClientConfig config) {

        return new DbribbonApplication.BazServiceList(config);

    }

    @Bean

    public ServerListSubsetFilter serverListFilter() {

        ServerListSubsetFilter filter = new ServerListSubsetFilter();

        return filter;

    }

}

Application

package com.shinho;

import org.springframework.boot.SpringApplication;

import org.springframework.boot.autoconfigure.SpringBootApplication;

import org.springframework.cloud.netflix.ribbon.RibbonClient;

import com.config.MyConfig;

import com.netflix.client.config.IClientConfig;

import com.netflix.loadbalancer.ConfigurationBasedServerList;

@SpringBootApplication

@RibbonClient(name = "service-ribbon", configuration = MyConfig.class)

public class DbribbonApplication {

    public static void main(String[] args) {

        SpringApplication.run(DbribbonApplication.class, args);

    }

    public static class BazServiceList extends ConfigurationBasedServerList {

        public BazServiceList(IClientConfig config) {

            super.initWithNiwsConfig(config);

        }

    }

}

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">

    <modelVersion>4.0.0</modelVersion>

    <groupId>com.shinho</groupId>

    <artifactId>dbribbon</artifactId>

    <version>0.0.1</version>

    <packaging>jar</packaging>

    <name>dbribbon</name>

    <description>Demo project for Spring Boot</description>

    <parent>

        <groupId>org.springframework.boot</groupId>

        <artifactId>spring-boot-starter-parent</artifactId>

        <version>2.0.0.RELEASE</version>

        <relativePath/> <!-- lookup parent from repository -->

    </parent>

    <properties>

        <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>

        <project.reporting.outputEncoding>UTF-8</project.reporting.outputEncoding>

        <java.version>1.8</java.version>

        <spring-cloud.version>Finchley.M9</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>org.springframework.boot</groupId>

            <artifactId>spring-boot-starter-test</artifactId>

            <scope>test</scope>

        </dependency>

        <dependency>

            <groupId>org.springframework</groupId>

            <artifactId>spring-expression</artifactId>

            <version>4.3.14.RELEASE</version>

        </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>

    <repositories>

        <repository>

            <id>spring-snapshots</id>

            <name>Spring Snapshots</name>

            <url>https://repo.spring.io/snapshot</url>

            <snapshots>

                <enabled>true</enabled>

            </snapshots>

        </repository>

        <repository>

            <id>spring-milestones</id>

            <name>Spring Milestones</name>

            <url>https://repo.spring.io/milestone</url>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </repository>

    </repositories>

    <pluginRepositories>

        <pluginRepository>

            <id>spring-snapshots</id>

            <name>Spring Snapshots</name>

            <url>https://repo.spring.io/snapshot</url>

            <snapshots>

                <enabled>true</enabled>

            </snapshots>

        </pluginRepository>

        <pluginRepository>

            <id>spring-milestones</id>

            <name>Spring Milestones</name>

            <url>https://repo.spring.io/milestone</url>

            <snapshots>

                <enabled>false</enabled>

            </snapshots>

        </pluginRepository>

    </pluginRepositories>

</project>

客户端就和其它的一样了，注意客户端的Service-id不要和Ribbon的重复，Ribbon的Service-id是要单独的哦。

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