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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