Docker 搭建 JDK21 Tomcat 10.1.x 性能调优

2024-06-14 阅读 {{counts.readCount}} 评论 {{counts.commentCount}}
## 前言
听说 JDK21 + Tomcat 10.1.x 性能显著提升
尤其是开启虚拟线程后，可以有20%以上性能提升
正好在部署一台新的服务器，且配置不高
研究本篇先记录下如何部署 Docker + JDK21 + Tomcat 10
并做简单的性能调优

补充一下
目前个人感觉Tomcat跑在Docker下性能损失也很大
直接跑在物理机下明显性能会更强，还没有具体测过
后续可能还想研究一下，直接在物理机部署Tomcat
如何能像Docker一样稳定运行、宕机自动重启
以及性能对比

## 折腾

先随便启动一次，把Tomcat文件复制出来
```shell
# 随便启动一下
docker run -d -p 8080:8080 --name tomcat tomcat:10.1.24-jdk21

# 复制tomcat目录到宿主机
docker cp tomcat:/usr/local/tomcat /root/docker/

# 停止并删除容器
docker stop tomcat
docker rm tomcat
```

接下来正式启动，把上一步得到的宿主机目录映射到虚拟机中
以下参数基于一台轻量云2C4G配置，请根据你的实际情况调整
```shell
# 参数解释
# -Xms500m：设置JVM的初始堆内存为500MB。
# -Xmx3000m：设置JVM的最大堆内存为3000MB。
# -XX:+UseG1GC：启用G1垃圾收集器，这是一种适合大堆内存的收集器，可以提供更可预测的停顿时间。
# -XX:MaxGCPauseMillis=200：设置G1收集器的最大垃圾收集停顿时间为200毫秒，以减少请求处理的延迟。
docker run -d -p 8080:8080 \
    -e "TZ=Asia/Shanghai" \
    -e CATALINA_OPTS="-Xms500m -Xmx3000m -XX:+UseG1GC -XX:MaxGCPauseMillis=200" \
    --restart=always \
    -v /root/docker/tomcat:/usr/local/tomcat \
    -m 3000m \
    --oom-kill-disable \
    --memory-swap=3000m \
    --name tomcat \
    tomcat:10.1.24-jdk21
```

顺便看一眼日志
```shell
docker logs -f tomcat
```

```shell
14-Jun-2024 15:47:45.557 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version name:   Apache Tomcat/10.1.24
14-Jun-2024 15:47:45.565 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server built:          May 9 2024 17:41:23 UTC
14-Jun-2024 15:47:45.566 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Server version number: 10.1.24.0
14-Jun-2024 15:47:45.566 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name:               Linux
14-Jun-2024 15:47:45.569 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version:            5.4.119-20.0009.29
14-Jun-2024 15:47:45.569 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture:          amd64
14-Jun-2024 15:47:45.569 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Java Home:             /opt/java/openjdk
14-Jun-2024 15:47:45.569 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Version:           21.0.3+9-LTS
14-Jun-2024 15:47:45.569 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor:            Eclipse Adoptium
14-Jun-2024 15:47:45.569 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE:         /usr/local/tomcat
14-Jun-2024 15:47:45.570 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME:         /usr/local/tomcat
14-Jun-2024 15:47:45.609 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties
14-Jun-2024 15:47:45.609 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
14-Jun-2024 15:47:45.610 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djdk.tls.ephemeralDHKeySize=2048
14-Jun-2024 15:47:45.610 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources
14-Jun-2024 15:47:45.610 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dorg.apache.catalina.security.SecurityListener.UMASK=0027
14-Jun-2024 15:47:45.610 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: --add-opens=java.base/java.lang=ALL-UNNAMED
14-Jun-2024 15:47:45.610 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: --add-opens=java.base/java.io=ALL-UNNAMED
14-Jun-2024 15:47:45.610 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: --add-opens=java.base/java.util=ALL-UNNAMED
14-Jun-2024 15:47:45.610 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: --add-opens=java.base/java.util.concurrent=ALL-UNNAMED
14-Jun-2024 15:47:45.610 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: --add-opens=java.rmi/sun.rmi.transport=ALL-UNNAMED
14-Jun-2024 15:47:45.611 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Xms500m
14-Jun-2024 15:47:45.611 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Xmx3000m
14-Jun-2024 15:47:45.611 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -XX:+UseG1GC
14-Jun-2024 15:47:45.611 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -XX:MaxGCPauseMillis=200
14-Jun-2024 15:47:45.611 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=/usr/local/tomcat
14-Jun-2024 15:47:45.611 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=/usr/local/tomcat
14-Jun-2024 15:47:45.611 INFO [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=/usr/local/tomcat/temp
14-Jun-2024 15:47:45.615 INFO [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent Loaded Apache Tomcat Native library [2.0.7] using APR version [1.7.0].
14-Jun-2024 15:47:45.620 INFO [main] org.apache.catalina.core.AprLifecycleListener.initializeSSL OpenSSL successfully initialized [OpenSSL 3.0.2 15 Mar 2022]
14-Jun-2024 15:47:46.288 INFO [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8080"]
14-Jun-2024 15:47:46.346 INFO [main] org.apache.catalina.startup.Catalina.load Server initialization in [1094] milliseconds
14-Jun-2024 15:47:46.464 INFO [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
14-Jun-2024 15:47:46.465 INFO [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet engine: [Apache Tomcat/10.1.24]
14-Jun-2024 15:47:46.510 INFO [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8080"]
14-Jun-2024 15:47:46.558 INFO [main] org.apache.catalina.startup.Catalina.start Server startup in [207] milliseconds
```

<br><br>
先申明一下，从这里往下的内容我也是第一次接触
本意是想开启虚拟线程，网传可以有20%性能提升
但我短时间内也无法确定我的配置是否正确
仅供参考！
后期有时间我会单独写一篇虚拟线程相关文章

官方文档地址:
https://tomcat.apache.org/tomcat-10.1-doc/config/executor.html
https://tomcat.apache.org/tomcat-10.1-doc/config/http.html

调优 `server.xml`
```xml
<Executor name="tomcatThreadPool" namePrefix="catalina-exec-"
	className="org.apache.catalina.core.StandardVirtualThreadExecutor"
    maxThreads="600" minSpareThreads="16" maxIdleTime="60000"/>
    
<Connector port="8080" executor="tomcatThreadPool"
       protocol="org.apache.coyote.http11.Http11Nio2Protocol" 
       connectionTimeout="30000"
       redirectPort="8443"
       maxParameterCount="2000"
       maxConnections="1000"
       acceptCount="10000"
       URIEncoding="UTF-8"
	   enableLookups="false"
	   disableUploadTimeout="true"
       />
```
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