新增用例
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罗祥
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2019-01-11 11:16:14.320 INFO 13496 --- [nio-8010-exec-4] c.n.e.registry.AbstractInstanceRegistry : Registered instance SERVER/DESKTOP-8JGSFLJ:server:8010 with status UP (replication=true)
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2019-01-11 11:16:15.084 INFO 13496 --- [ Thread-41] c.n.e.registry.AbstractInstanceRegistry : Registered instance SERVER/DESKTOP-8JGSFLJ:server:8020 with status UP (replication=true)
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2019-01-11 11:16:15.085 INFO 13496 --- [ Thread-41] c.n.e.registry.AbstractInstanceRegistry : Registered instance SERVER/DESKTOP-8JGSFLJ:server:8030 with status UP (replication=true)
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# eureka 高可用注册中心的搭建
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## 一、项目结构
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eureka-server为服务注册中心，负责服务的管理；
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eureka-client 为eureka客户端；
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## 二、三步搭建eureka 高可用注册中心
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这里我们以单机伪集群的方式搭建，让三个单机注册中心互相注册，实现注册中心的高可用。配置示意图如下：
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#### 2.1 引入eureka服务端依赖
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```xml
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
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</dependency>
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```
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#### 2.2 创建三份配置文件，分别代表不同注册中心的配置
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application-01.yml:
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```yaml
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spring:
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application:
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name: server
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server:
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port: 8010
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eureka:
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server:
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# 关闭自我保护机制 开发的时候可以开启 保证不可用的服务能够及时剔除
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enable-self-preservation: false
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instance:
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hostname: 127.0.0.1
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client:
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serviceUrl:
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defaultZone: http://localhost:8020/eureka/,http://192.168.200.228:8030/eureka/
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```
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application-02.yml
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```yaml
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spring:
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application:
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name: server
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server:
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port: 8020
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eureka:
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server:
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# 关闭自我保护机制 开发的时候可以开启 保证不可用的服务能够及时剔除
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enable-self-preservation: false
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instance:
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hostname: localhost
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client:
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serviceUrl:
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defaultZone: http://127.0.0.1:8010/eureka/,http://192.168.200.228:8030/eureka/
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```
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application-03.yml
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```yaml
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spring:
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application:
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name: server
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server:
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port: 8030
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eureka:
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server:
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# 关闭自我保护机制 开发的时候可以开启 保证不可用的服务能够及时从列表中剔除
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enable-self-preservation: false
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instance:
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hostname: 192.168.200.228
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client:
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serviceUrl:
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defaultZone: http://127.0.0.1:8010/eureka/,http://localhost:8020/eureka/
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```
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需要注意的是Eureka互相注册要求各个Eureka实例的eureka.instance.hostname不同，如果相同，则会被Eureka标记为unavailable-replicas（不可用副本）。
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#### 2.3 启动类上增加注解@EnableEurekaServer激活eureka服务端自动配置
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```java
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@SpringBootApplication
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@EnableEurekaServer
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public class EurekaServerApplication {
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public static void main(String[] args) {
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SpringApplication.run(EurekaServerApplication.class, args);
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}
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}
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```
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## 三、三步搭建eureka 客户端
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#### 3.1 引入eureka客户端依赖
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```xml
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
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</dependency>
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```
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#### 3.2 eureka 客户端配置,指定注册中心地址
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```yaml
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server:
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port: 8040
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# 指定服务命名
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spring:
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application:
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name: eureka-client
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# 指定注册中心地址
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eureka:
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client:
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serviceUrl:
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defaultZone: http://127.0.0.1:8010/eureka/,http://localhost:8020/eureka/,http://192.168.200.228:8030/eureka/
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```
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#### 3.3 启动类上增加注解@EnableDiscoveryClient激活eureka客户端自动配置
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```java
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@SpringBootApplication
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@EnableDiscoveryClient
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public class EurekaClientApplication {
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public static void main(String[] args) {
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SpringApplication.run(EurekaClientApplication.class, args);
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}
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}
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```
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## 4.启动项目
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### 4.1 这里我们可以采用命令行方式指定配置，分别启动三个注册中心
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### 4.2 高可用集群搭建成功的判定
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这里需要主要的是仅仅status中出现其他注册中心时，并不一定是搭建成功的，**一定是当注册中心的DS Replicas 和 available replicas中显示其余的注册中心时候**，才代表搭建成功。
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#### **4.2.1 点击下面注册中心的可用实例列表中的地址，访问链接分以下几个情况：**
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1. hostname和prefer-ip-address都没有配置，则访问 主机名:服务名:端口号，
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```
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如：http://desktop-8jgsflj:8761/info
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```
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2. 配置了hostname而没有配置prefer-ip-address，则访问 hostname:服务名:端口号，
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如：http://server:8761/info
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3. 如果配置了prefer-ip-address，则访问 ipAddress:服务名:端口号，
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如：http://192.168.200.228:8761/info
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8010 注册中心：
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8020 注册中心：
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8030 注册中心：
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### 4.3 prefer-ip-address 参数说明
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在有的配置示例中，配置了prefer-ip-address为true。
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```properties
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eureka.instance.prefer-ip-address=true
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```
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在多机器独立部署的情况下是没有问题的，配置prefer-ip-address为ture，代表发现服务时候优先按照ip去搜寻，对于多集群而言，可以保证尽快准确搜索到服务。而对于单机部署来说，ip地址都是相同的，这会导致其余注册中心出现在unavailable-replicas(不可用副本)中。所以单机部署时候不建议开启这个参数（默认值为false），多机部署时候可以开启。
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@ -0,0 +1,98 @@
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# eureka 服务的注册与发现
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## 一、项目结构
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eureka-server为服务注册中心，负责服务的管理；
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eureka-client 为eureka客户端；
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## 二、三步搭建eureka 服务注册中心
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#### 2.1 引入eureka服务端依赖
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```xml
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-starter-netflix-eureka-server</artifactId>
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</dependency>
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```
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#### 2.2 eureka 服务端配置
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```yaml
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server:
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port: 8010
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eureka:
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instance:
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hostname: localhost
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client:
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# 设置为false,代表不向注册中心注册自己
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register-with-eureka: false
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# 注册中心主要用于维护服务，并不需要检索服务，所以设置为false
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fetch-registry: false
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serviceUrl:
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defaultZone: http://${eureka.instance.hostname}:${server.port}/eureka/
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```
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#### 2.3 启动类上增加注解@EnableEurekaServer激活eureka服务端自动配置
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```java
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@SpringBootApplication
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@EnableEurekaServer
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public class EurekaServerApplication {
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public static void main(String[] args) {
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SpringApplication.run(EurekaServerApplication.class, args);
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}
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}
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```
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## 三、三步搭建eureka 客户端
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#### 3.1 引入eureka客户端依赖
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```xml
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<dependency>
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<groupId>org.springframework.cloud</groupId>
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<artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
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</dependency>
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```
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#### 3.2 eureka 客户端配置
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```yaml
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server:
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port: 8020
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# 指定服务命名
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spring:
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application:
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name: eureka-client
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# 指定注册中心地址
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eureka:
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client:
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serviceUrl:
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defaultZone: http://localhost:8010/eureka/
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```
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#### 3.3 启动类上增加注解@EnableDiscoveryClient激活eureka客户端自动配置
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```java
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@SpringBootApplication
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@EnableDiscoveryClient
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public class EurekaClientApplication {
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public static void main(String[] args) {
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SpringApplication.run(EurekaClientApplication.class, args);
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}
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}
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```
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## 4.启动项目
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#### 4.1 进入注册中心控制台，查看服务注册情况
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