标签：规则 host balance classname 一段 随机 disco ribbon 地址
很多场景下，可能根据需要自定义Ribbon的配置，例如修改Ribbon的负载均衡规则等。Spring Cloud Edgware允许使用java代码或属性自定义Ribbon 的配置，两种方式等价。
我们先说使用Java代码写配置类的方式定义负载均衡算法。
复制项目microservive-consumer-movie-ribbon，将ArtifactId修改为microservice-consumer-movie-ribbon-customizing。
1.创建Ribbon的配置类
@Configuration public class RibbonConfiguration { @Bean public IRule ribbonRule() { // 负载均衡规则，改为随机 return new RandomRule(); } }
这里要说一下，很关键。
这个类一定不要放到启动类同目录或同目录的子目录下，也就是@SpringBootApplication注解的子注解@ComponentScan所能扫描到的地方。否则该类中的配置信息将被所有的@RibbonClient共享。
当然了，你要是就想放到@ConponentScan能扫描的目录下，你需要手动exclude掉，告诉springboot,不扫描它。
2.再创建一个空类，并在其上添加@Configuration注解和@RibbonClient注解。
@Configuration @RibbonClient(name="microservice-provider-user",configuration=RibbonConfiguration.class) public class TestConfiguration { }
启动microservice-discovery-eureka.
启动两个或更多microservice-provider-user.
启动microservice-consumer-movie-ribbon-customizing
多次访问http://localhost:8082/log-user-instance,看控制台信息
2019-04-15 19:14:31.268 INFO 10592 --- [nio-8082-exec-9] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:14:31.436 INFO 10592 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:14:31.607 INFO 10592 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:14:31.776 INFO 10592 --- [nio-8082-exec-4] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:14:31.923 INFO 10592 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:14:32.081 INFO 10592 --- [nio-8082-exec-9] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:14:32.269 INFO 10592 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:14:32.437 INFO 10592 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:14:32.592 INFO 10592 --- [nio-8082-exec-4] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:14:32.776 INFO 10592 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:14:32.955 INFO 10592 --- [nio-8082-exec-9] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:14:33.138 INFO 10592 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:14:33.312 INFO 10592 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084
没毛病！
我们再说通过配置yml文件的方式。我的观点是，能用配置的方式，尽量不用Java代码！
改个名字先：microservice-consumer-movie-ribbon-customizing-properties
和上面的方式比较：把上面那俩Java类删咯。在application.yml文件中加上一段。
server: port: 8082 eureka: client: healthcheck: enabled: true serviceUrl: defaultZone: http://localhost:8083/eureka/ instance: prefer-ip-address: true spring: application: name: microservice-consumer-movie # 表示对这个user的Ribbon Client的负载均衡设置为随机 # 如果去掉16行，下面当然往前移两格，表示对所有的设置为随机 microservice-provider-user: ribbon: NFLoadBalancerRuleClassName: com.netflix.loadbalancer.RandomRule
你看，就三行，还是配置方便，快捷。
启动microservice-discovery-eureka
启动两个或多个microservice-provider-user实例
启动microservice-consumer-movie-ribbon-customizing-properties
多次访问http://localhost:8082/log-user-instance.看控制台
2019-04-15 19:27:32.866 INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:27:33.044 INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:33.370 INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:33.558 INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:33.746 INFO 12792 --- [nio-8082-exec-5] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:27:33.945 INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:34.129 INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:27:34.329 INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:34.521 INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:27:34.711 INFO 12792 --- [nio-8082-exec-5] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:27:34.895 INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:35.103 INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:35.289 INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:27:35.504 INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:35.705 INFO 12792 --- [nio-8082-exec-5] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:35.895 INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:36.081 INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:36.279 INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:36.481 INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:27:36.650 INFO 12792 --- [nio-8082-exec-5] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:27:36.863 INFO 12792 --- [nio-8082-exec-7] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:37.057 INFO 12792 --- [nio-8082-exec-8] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081 2019-04-15 19:27:37.250 INFO 12792 --- [nio-8082-exec-1] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8084 2019-04-15 19:27:37.409 INFO 12792 --- [nio-8082-exec-3] c.i.cloud.controller.MovieController : microservice-provider-user:192.168.1.33:8081
还是没毛病！
代码下载地址：https://gitee.com/fengyuduke/my_open_resources/blob/master/ribbon-customizing&properties.zip
标签：规则 host balance classname 一段 随机 disco ribbon 地址
原文地址：https://www.cnblogs.com/fengyuduke/p/10712569.html
