# 57. 进程监控

在`Spring Boot`模块中，你可以找到两个类来创建通常对进程监控有用的文件：

* `ApplicationPidFileWriter`创建一个包含应用PID的文件（默认位于应用目录，文件名为`application.pid`）。
* `WebServerPortFileWriter`创建一个或多个包含运行的服务器端口的文件（默认位于应用目录，文件名为`application.port`）。

这些writers默认没被激活，但你可以启用它们：

* [55.1 扩展配置](https://docs.spring.io/spring-boot/docs/2.0.0.RELEASE/reference/htmlsingle/#production-ready-process-monitoring-configuration)
* [57.2 以编程方式](https://docs.spring.io/spring-boot/docs/2.0.0.RELEASE/reference/htmlsingle/#production-ready-process-monitoring-programmatically)


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