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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>29.3. 容器中如何优雅关闭 Springboot</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="ch29s02.html" title="29.2. kill 命令演示" /><link rel="next" href="ch29s04.html" title="29.4. 写入PID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">29.3. 容器中如何优雅关闭 Springboot</th></tr><tr><td width="20%" align="left"><a accesskey="p" href="ch29s02.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="ch29s04.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="id2095"></a>29.3. 容器中如何优雅关闭 Springboot</h3></div></div></div>
<p>容器与进程模式并没有什么区别，我们给容器发送终止信号，容器会转发给 Springboot。</p>
<p>理论归理论，我们还是需要亲自实践，这样才能理解更深刻。</p>
<p>准备实验环境和素材，下面是 docker-compose.yaml 编排文件</p>
<pre class="screen">
version: '3.9'
services:
spring:
image: openjdk:latest
container_name: spring
restart: always
hostname: www.netkiller.cn
environment:
TZ: Asia/Shanghai
JAVA_OPTS: -Xms256m -Xmx512m -XX:MetaspaceSize=128m -XX:MaxMetaspaceSize=512m
ports:
- 8099:8080
volumes:
- ./test-0.0.1-SNAPSHOT.jar:/app/test-0.0.1-SNAPSHOT.jar
entrypoint: java -jar /app/test-0.0.1-SNAPSHOT.jar
command:
--spring.profiles.active=dev
--server.port=8080
</pre>
<div class="itemizedlist"><p class="title"><strong>实验步骤</strong></p><ul class="itemizedlist" style="list-style-type: disc; "><li class="listitem">运行容器：docker-compose up</li><li class="listitem">观察容器：docker-compose logs -f</li><li class="listitem">停止容器：</li></ul></div>
<p>运行容器</p>
<pre class="screen">
[root@localhost netkiller.cn]# docker-compose up -d
Starting spring ... done
</pre>
<p>观察容器日志</p>
<pre class="screen">
[root@localhost netkiller.cn]# docker-compose logs -f
spring | Starting...
spring |
spring | . ____ _ __ _ _
spring | /\\ / ___'_ __ _ _(_)_ __ __ _ \ \ \ \
spring | ( ( )\___ | '_ | '_| | '_ \/ _` | \ \ \ \
spring | \\/ ___)| |_)| | | | | || (_| | ) ) ) )
spring | ' |____| .__|_| |_|_| |_\__, | / / / /
spring | =========|_|==============|___/=/_/_/_/
spring | :: Spring Boot :: (v2.5.3)
spring |
spring | 2021-07-29 11:29:34.556 INFO 1 --- [ main] cn.netkiller.Application : Starting Application v0.0.1-SNAPSHOT using Java 16.0.2 on www.netkiller.cn with PID 1 (/app/test-0.0.1-SNAPSHOT.jar started by root in /)
spring | 2021-07-29 11:29:34.559 INFO 1 --- [ main] cn.netkiller.Application : The following profiles are active: dev
spring | 2021-07-29 11:29:35.903 WARN 1 --- [ main] io.undertow.websockets.jsr : UT026010: Buffer pool was not set on WebSocketDeploymentInfo, the default pool will be used
spring | 2021-07-29 11:29:35.921 INFO 1 --- [ main] io.undertow.servlet : Initializing Spring embedded WebApplicationContext
spring | 2021-07-29 11:29:35.921 INFO 1 --- [ main] w.s.c.ServletWebServerApplicationContext : Root WebApplicationContext: initialization completed in 1274 ms
spring | 2021-07-29 11:29:36.411 INFO 1 --- [ main] o.s.b.a.e.web.EndpointLinksResolver : Exposing 1 endpoint(s) beneath base path '/actuator'
spring | 2021-07-29 11:29:36.437 INFO 1 --- [ main] io.undertow : starting server: Undertow - 2.2.9.Final
spring | 2021-07-29 11:29:36.444 INFO 1 --- [ main] org.xnio : XNIO version 3.8.4.Final
spring | 2021-07-29 11:29:36.451 INFO 1 --- [ main] org.xnio.nio : XNIO NIO Implementation Version 3.8.4.Final
spring | 2021-07-29 11:29:36.511 INFO 1 --- [ main] org.jboss.threads : JBoss Threads version 3.1.0.Final
spring | 2021-07-29 11:29:36.547 INFO 1 --- [ main] o.s.b.w.e.undertow.UndertowWebServer : Undertow started on port(s) 8080 (http)
spring | 2021-07-29 11:29:36.560 INFO 1 --- [ main] cn.netkiller.Application : Started Application in 2.48 seconds (JVM running for 2.923)
</pre>
<p>停止容器</p>
<pre class="screen">
[root@localhost netkiller.cn]# docker ps | grep spring
8901384d1973 openjdk:latest "java -jar /app/test…" 3 minutes ago Up About a minute 0.0.0.0:8099->8080/tcp, :::8099->8080/tcp spring
[root@localhost netkiller.cn]# docker stop spring
spring
[root@localhost netkiller.cn]# docker ps | grep spring
</pre>
<p>在观察日志</p>
<pre class="screen">
spring | 2021-07-29 11:31:31.807 INFO 1 --- [ionShutdownHook] io.undertow : stopping server: Undertow - 2.2.9.Final
spring | ==============================
spring | Destroying Spring
spring | ==============================
spring exited with code 143
</pre>
<p>现在可以看到 Springboot 是正常退出的</p>
<p>下面我们再做一个实验 docker kill</p>
<pre class="screen">
[root@localhost netkiller.cn]# docker-compose start
Starting spring ... done
[root@localhost netkiller.cn]# docker-compose logs -f
[root@localhost netkiller.cn]# docker kill spring
spring
</pre>
<p>此时再观察日志，只输出了一行。</p>
<pre class="screen">
spring exited with code 137
</pre>
<p>结论，docker kill = kill -9</p>
<p>现在你应该明白什么时候该使用什么命令终止程序了吧，同时我们在写程序的时候，也应该将程序的运行状态反应出来，在我们停止程序运行的时候，可以去观察进程的状态，而不是半天没有反应，只能怀疑进程死了，必须执行B计划（kill -9）这会造成很多数据丢失的问题。</p>
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