不间断重启springboot项目

前提：

服务至少要部署两台机上，当其中一台下线后，由另一台提供对外服务

1，依赖

 <dependencies>
        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-eureka-client</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-web</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.cloud</groupId>
            <artifactId>spring-cloud-starter-netflix-hystrix</artifactId>
        </dependency>

        <dependency>
            <groupId>org.springframework.boot</groupId>
            <artifactId>spring-boot-starter-actuator</artifactId>
        </dependency>
    </dependencies>




 <dependencyManagement>
        <dependencies>
            <dependency>
                <groupId>org.springframework.cloud</groupId>
                <artifactId>spring-cloud-dependencies</artifactId>
                <version>Hoxton.SR3</version>
                <type>pom</type>
                <scope>import</scope>
            </dependency>


        </dependencies>
    </dependencyManagement>

application.yml 配置

management.endpoint.shutdown.enabled=true
management.endpoint.health.show-details=always
management.endpoints.web.exposure.include=*

#微服务上线请求
curl -H "Content-Type:application/vnd.spring-boot.actuator.v2+json;charset=UTF-8" -X POST http://localhost:2{{ port }}/actuator/service-registry?status=UP

#微服务下线请求
curl -H "Content-Type:application/vnd.spring-boot.actuator.v2+json;charset=UTF-8" -X POST http://localhost:2890/actuator/service-registry?status=DOWN

#eureka 小知识
>eureka 清理过期服务的时间间隔是0s，即不清理实例
```yaml
eureka.server.eviction-interval-timer-in-ms 

```

>eureka 客户端配置

eureka 服务端如果发现客户端在这个时间段内没有收到心跳，会将客户端下线
默认值90s
```yaml
eureka.instance.lease-expiration-duration-in-seconds

```

>客户端通过eureka.instance.lease-renewal-interval-in-seconds 
每隔这个时间会主动心跳一次，默认值为30s，更新自己的状态。