springcloud学习（五）之hystrix容错机制和spring cloud 配置中心-爱代码爱编程

一.Hystrix容错机制：在不改变各个微服务调用关系的前提下，针对错误情况进行预先的处理

设计原则

1. 服务隔离机制

2. 服务降级机制

3. 熔断机制

4. 提供实时的监控和报警功能

5. 提供实时的配置修改功能

二.Hystrix数据监控需要结合Spring Cloud Actuator提供了对服务的健康监控，数据统计，可以通过hystrix-stream节点获取监控的请求数据，提供了可视化监控界面

1. 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">
    <parent>
        <artifactId>ygdSpringCloud</artifactId>
        <groupId>org.example</groupId>
        <version>1.0-SNAPSHOT</version>
    </parent>
    <modelVersion>4.0.0</modelVersion>

    <artifactId>Hystrix</artifactId>

    <properties>
        <maven.compiler.source>8</maven.compiler.source>
        <maven.compiler.target>8</maven.compiler.target>
    </properties>
    <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-openfeign</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
            <version>2.0.5.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix-dashboard</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>
    </dependencies>

</project>

2.application.yml

server:
  port: 8060
spring:
  application:
    name: hystrix
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/
  instance:
    prefer-ip-address: true
feign:
  hystrix:
    enabled: true
    # s数据监控节点 localhost:8060/actuator/hystrix.stream
management:
  endpoints:
    web:
      exposure:
        include: 'hystrix.stream'

3.启动类

@SpringBootApplication
@EnableFeignClients
@EnableCircuitBreaker //声明启用数据监控
@EnableHystrixDashboard //声明启用可视化数据监控
public class HystrixApplication {
    public static void main(String[] args) {
        SpringApplication.run(HystrixApplication.class,args);
    }
}

4.查看监控数据http://localhost:8060/actuator/hystrix.stream

5.可视化平台http://localhost:8060/hystrix 填入监控的节点：http://localhost:8060/actuator/hystrix.stream

三.Spring Cloud 配置中心

1. 本地配置

server端配置

 <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-config-server</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>

server:
  port: 8762
spring:
  application:
    name: nativeconfigserver
  profiles:
    active: native
  cloud:
    config:
      server:
        native:
          search-locations: classpath:/shared

shared配置文件 configclient-dev.yml

server:
  port: 8070
foo: foo version 1

client端配置文件

 <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-config</artifactId>
            <version>2.0.2.RELEASE</version>
        </dependency>

配置bootstrap.yml文件

spring:
  application:
    name: configclient
  profiles:
    active: dev
    #本地ConfigDServer的访问路径
  cloud:
    config:
      uri: http://localhost:8762
      fail-fast: true

2.远程拉取配置

我们拉取config配置文件

server端配置：

server:
  port: 8888
spring:
  application:
    name: configserver
  cloud:
    config:
      server:
        git:
          #githhub地址
          uri: 
          search-paths: config
          #远程仓库的用户名密码
          username: 
          password: 
        default-label: master
eureka:
  client:
    service-url:
      defaultZone: http://localhost:8761/eureka/