详解spring-cloud与netflixEureka整合（注册中心）

基础依赖

compile('org.springframework.boot:spring-boot-starter-actuator')
compile('org.springframework.boot:spring-boot-starter-web')
compile('org.springframework.cloud:spring-cloud-starter') 

eureka（单机）

服务端：

依赖

compile('org.springframework.cloud:spring-cloud-starter-netflix-eureka-server') 

application.yml 配置

spring:
 application:
  name: dev
eureka:
 client:
  service-url:
   defaultZone: http://本机ip地址:8761/eureka/ #注册中心地址
  register-with-eureka: false #表明该实例是否应该与尤里卡服务器登记其信息被别人发现。在某些情况下,您不希望您的实例被发现而你想发现其他实例。默认为true
  fetch-registry: false #表明这个客户是否应该从尤里卡服务器获取尤里卡注册表信息。默认为true
server:
 port: 8761

启动类添加 @EnableEurekaServer

客户端：

主要依赖

compile('org.springframework.cloud:spring-cloud-starter-netflix-eureka-client') 

application.yml 配置

eureka:
 client:
  service-url:
   defaultZone: http://eureka服务地址:8761/eureka/

启动类添加 @EnableDiscoveryClient （注册中心通用客户端注解）或 @EnableEurekaClient （只有eureka客户端可用）

eureka（集群）

服务端

主要依赖

compile('org.springframework.cloud:spring-cloud-starter-netflix-eureka-server')
compile('org.springframework.cloud:spring-cloud-starter-netflix-eureka-client')

application.yml 配置

server:
 port: 8761
eureka:
 client:
  register-with-eureka: false
  fetch-registry: false
 server:
  enable-self-preservation: false #使用自我保护，默认true
  peer-node-read-timeout-ms: 5000 #节点读取超时时间，默认200毫秒
---
spring:
 application:
  name: eureka1
 profiles: eureka1
eureka:
 client:
  service-url:
   defaultZone: http://eureka2:8761/eureka/,http://eureka3:8761/eureka/
 instance:
  hostname: eureka1
---
spring:
 application:
  name: eureka2
 profiles: eureka2
eureka:
 client:
  service-url:
   defaultZone: http://eureka1:8761/eureka/,http://eureka3:8761/eureka/
 instance:
  hostname: eureka2
---
spring:
 application:
  name: eureka3
 profiles: eureka3
eureka:
 client:
  service-url:
   defaultZone: http://eureka1:8761/eureka/,http://eureka2:8761/eureka/
 instance:
  hostname: eureka3

eureka.client.service-url.defaultZone 与 eureka.instance.hostsname eureka1、eureka2、eureka3  都再本机的 hosts 文件里事先写好,

例如 eureka1 服务器上的hosts文件
127.0.0.1   localhost localhost.localdomain localhost4 localhost4.localdomain4
::1         localhost localhost.localdomain localhost6 localhost6.localdomain6
127.0.0.1   eureka1
xxx.xxx.x.xx eureka2
xx.xxx.xxx.xx eureka3

启动类同样是添加 @EnableEurekaServer 注意：如果运行 jar 包时需要程序接收命令行参数，一定要再main方法的 SpringApplication.run() 方法 中传入 args 参数

例如：

public static void main(String[] args) {
   SpringApplication.run(QnbbsConsumer.class,args);
}

如果不传入的话在命令行输入 java -jar xxx.jar --参数名=参数值 参数将不起作用从而影响你无法选择写好的环境配置

客户端：

依赖跟单机的一样

application.yml 配置

eureka:
 instance:
  prefer-ip-address: true #是否显示ip
  ip-address: 本机ip #填写本机ip地址
 client:
  service-url:
   defaultZone: http://eureka1:8761/eureka/,http://eureka2:8761/eureka/，http://eureka3:8761/eureka/

启动类注解与单机版一样

客户端注册一台注册中心，同时注册到其他集群中说明成功！

eureka添加 spring-security 权限认证

依赖

compile('org.springframework.cloud:spring-cloud-starter-netflix-eureka-client')
compile('org.springframework.boot:spring-boot-starter-security')
compile('org.springframework.cloud:spring-cloud-starter-netflix-eureka-server') 

application.yml 配置

server:
 port: 8761
spring:
 application:
  name: eureka-server
 security:
  user:
   name: zyn
   password: zyn123...
  #用户名与密码若是不配置，系统会自动生成并打印在控制台日志上

eureka:
 client:
  register-with-eureka: false
  fetch-registry: false
 server:
  enable-self-preservation: false
  peer-node-read-timeout-ms: 5000

management:
 endpoints:
  web:
   base-path: /
   exposure:
    include: '*'
 endpoint:
  health:
   show-details: always
  restart:
   enabled: true
 server:
  port: 8761
---
spring:
 profiles: eureka-jy
eureka:
 client:
  service-url:
   defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-B:8761/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-C:8761/eureka/
 instance:
  hostname: eureka-A
---
spring:
 profiles: eureka-lhn
eureka:
 client:
  service-url:
   defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-A:8761/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-C:8761/eureka/
 instance:
  hostname: eureka-B
---
spring:
 profiles: eureka-zsm
eureka:
 client:
  service-url:
   defaultZone: http://${spring.security.user.name}:${spring.security.user.password}@eureka-A:8761/eureka/,http://${spring.security.user.name}:${spring.security.user.password}@eureka-B:8761/eureka/
 instance:
  hostname: eureka-C

创建一个类并继承 WebSecurityConfigurerAdapter 类，并在此类上添加 @EnableWebSecurity和@Configuration 注解，重写 configure 方法

package com.iteng.eureka.security;​
import org.springframework.context.annotation.Configuration;
import org.springframework.security.config.annotation.web.builders.HttpSecurity;
import org.springframework.security.config.annotation.web.configuration.EnableWebSecurity;
import org.springframework.security.config.annotation.web.configuration.WebSecurityConfigurerAdapter;
​
@EnableWebSecurity
@Configuration
public class WebSecurityConfig extends WebSecurityConfigurerAdapter {
​
  @Override
  protected void configure(HttpSecurity http) throws Exception {
    http.csrf().disable(); // 关闭csrf
    http.authorizeRequests().anyRequest().authenticated().and().httpBasic(); // 开启认证
  }
}

启动类添加注解

@EnableEurekaServer
@EnableWebSecurity

下线服务

http://eureka地址:端口/eureka/apps/服务名/服务地址:服务端口号

实例如下：

erueka注册中心ip: 10.100.1.100

端口: 12000

服务名: CPS-RISK-SERVER

实例id: 192.168.10.54:18883

则向下面的url通过http发送delete命令，可将指定的服务实例删除：
http://10.100.1.100:12000/eureka/apps/CPS-RISK-SERVER/192.168.10.54:18883

变更服务状态

http://eureka地址:端口/eureka/apps/服务名/服务地址/status?value=${value}

其中${value}的取值为：OUT_OF_SERVICE , DOWN , UP

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