Spring Eureka:轻轻关闭服务 [英] Spring Eureka: gently shutdown a service

问题描述

我有服务A，它使用服务B1和B2(同一服务的两个实例)，所有服务都通过Eureka配置.

I have service A, that is using services B1 and B2 (two instances of same service), all configured via Eureka.

现在，我要轻轻地取下B1(这样A不会遇到处理失败的B1请求的问题/延迟).我想要一个这样的程序:

Now I would like to take B1 gently down (so that A has not problems/delays with handling failing B1 requests). I would like to have such a procedure for that:

1. 告诉B1停止对Eureka进行ping
2. 让尤里卡(Eureka)宣告说B1正在下降
3. 等待直到A获得信息并且不再使用B1
4. 然后关闭B1

我在第1步中遇到问题.如何请求B1停止查验?寻找了一些JMX操作，但没有找到.

I have a problem with step 1. How can I request B1 to stop pinging? Looked for some JMX operation but not found.

(如果我跳过了第1步，只是从Eureka中删除了B1，它将被从注册表中删除，但是由于B1仍然对Eureka执行ping操作，因此它会快速更新)

(If I skipped step 1, and just DELETE B1 from Eureka, it is removed from registry, but it will be quickly renewed, because B1 is still pinging Eureka)

推荐答案

如果将cloud-starter和actuator依赖项添加到项目中

If you add the cloud-starter and actuator depencency to your project

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

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

您将有许多管理端点(由actuator提供). POST到/pause将导致尤里卡中的DOWN状态(感谢cloud-starter).当eureka客户端收到状态时，Ribbon将不会将任何请求路由到您的DOWN服务.发布到/shutdown将正常停止该应用程序.

you will have a number of managing endpoints (provided by actuator). A POST to /pause will result in a status of DOWN in eureka (thanks to cloud-starter). When the eureka clients receive the status, Ribbon won't route any request to your DOWN service. Posting to /shutdown will gracefully stop the application.

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