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<?xml version="1.0" encoding="UTF-8" standalone="no"?>
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"><html xmlns="http://www.w3.org/1999/xhtml"><head><meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /><title>29.4. 写入PID文件</title><link rel="stylesheet" type="text/css" href="../docbook.css" /><meta name="generator" content="DocBook XSL Stylesheets Vsnapshot" /><link rel="home" href="../index.html" title="Netkiller Java 手札（版）" /><link rel="up" href="spring.boot.shutdown.html" title="第 29 章 如何优雅停止 Springboot 运行" /><link rel="prev" href="ch29s03.html" title="29.3. 容器中如何优雅关闭 Springboot" /><link rel="next" href="properties/index.html" title="第 30 章 Properties 配置文件" /></head><body><a xmlns="" href="//www.netkiller.cn/">Home</a> | <a xmlns="" href="//netkiller.github.io/">简体中文</a> | <a xmlns="" href="http://netkiller.sourceforge.net/">繁体中文</a> | <a xmlns="" href="/journal/index.html">杂文</a>
| <a xmlns="" href="https://github.com/netkiller">Github</a> | <a xmlns="" href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a> | <a xmlns="" href="https://www.facebook.com/bg7nyt">Facebook</a> | <a xmlns="" href="http://cn.linkedin.com/in/netkiller/">Linkedin</a> | <a xmlns="" href="https://www.youtube.com/user/bg7nyt/videos">Youtube</a> | <a xmlns="" href="//www.netkiller.cn/home/donations.html">打赏(Donations)</a> | <a xmlns="" href="//www.netkiller.cn/home/about.html">About</a><div class="navheader"><table width="100%" summary="Navigation header"><tr><th colspan="3" align="center">29.4. 写入PID文件</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch29s03.html">上一页</a> </td><th width="60%" align="center">第 29 章 如何优雅停止 Springboot 运行</th><td width="20%" align="right"> <a accesskey="n" href="properties/index.html">下一页</a></td></tr></table><hr /></div><table xmlns=""><tr><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=watch&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&repo=netkiller.github.io&type=fork&count=true&size=large" height="30" width="170" frameborder="0" scrolling="0" style="width:170px; height: 30px;" allowTransparency="true"></iframe></td><td><iframe src="//ghbtns.com/github-btn.html?user=netkiller&type=follow&count=true&size=large" height="30" width="240" frameborder="0" scrolling="0" style="width:240px; height: 30px;" allowTransparency="true"></iframe></td><td></td><td><a href="https://zhuanlan.zhihu.com/netkiller"><img src="/images/logo/zhihu-card-default.svg" height="25" /></a></td><td valign="middle"><a href="https://zhuanlan.zhihu.com/netkiller">知乎专栏</a></td><td></td><td></td><td></td><td></td></tr></table><div class="section"><div class="titlepage"><div><div><h3 class="title"><a id="id2096"></a>29.4. 写入PID文件</h3></div></div></div>
<p>我们明白了 kill 的原理后，常常需要与 pid 打交道，使用 ps 命令是可以查看 pid 的，但是当我们运行多个实例的时候会常常搞混，所以最好的方式是让 springboot 把PID写入到文件中。</p>
<pre class="programlisting">
package cn.netkiller;
import org.springframework.boot.SpringApplication;
import org.springframework.boot.autoconfigure.SpringBootApplication;
import org.springframework.boot.context.ApplicationPidFileWriter;
@SpringBootApplication
public class Application {
public static void main(String[] args) {
System.out.println("Starting...");
SpringApplication springApplication = new SpringApplication(Application.class);
springApplication.addListeners(new ApplicationPidFileWriter());
springApplication.run(args);
}
}
</pre>
<p>程序运行后会在当前目录下产生一个 PID 文件</p>
<pre class="screen">
neo@MacBook-Pro-Neo ~/workspace/microservice/test % cat application.pid
44027
</pre>
<p>修改 pid 文件位置可以配置 application.properties </p>
<pre class="screen">
server.port=8080
spring.pid.file=/tmp/spring.pid
</pre>
<p>在启动的时候指定 pid 文件位置</p>
<pre class="programlisting">
SpringApplication application = new SpringApplication(Application.class);
application.addListeners(new ApplicationPidFileWriter("/tmp/app.pid"));
application.run();
</pre>
<p>最后说说容器，容器的进程ID永远是 1 所以配置与否自己斟酌。</p>
<pre class="screen">
[root@localhost netkiller.cn]# docker exec -it spring cat /tmp/spring.pid
1
</pre>
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