不間斷重啟springboot項目

前提：

服務至少要部署兩台機上，當其中一台下線后，由另一台提供對外服務

 

1，依賴

<parent>
    <groupId>org.springframework.boot</groupId>
    <artifactId>spring-boot-starter-parent</artifactId>
    <version>2.2.2.RELEASE</version>
</parent>


 <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=*

 

 

#微服務上線請求

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

 

#微服務下線請求

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 小知識
>eureka 清理過期服務的時間間隔是0s，即不清理實例

eureka.server.eviction-interval-timer-in-ms 

 

>eureka 客戶端配置

eureka 服務端如果發現客戶端在這個時間段內沒有收到心跳，會將客戶端下線
默認值90s

eureka.instance.lease-expiration-duration-in-seconds

 

>客戶端通過eureka.instance.lease-renewal-interval-in-seconds 
每隔這個時間會主動心跳一次，默認值為30s，更新自己的狀態。