我的 Centos 7 上有一个运行着 Tomcat 9 服务器。
当我发出htop命令时，我有一个 tomcat 进程被列出多次，我想了解为什么它会出现多次
PID USER PRI NI VIRT RES SHR S CPU% MEM% TIME+ Command
18 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:07.27 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
1 root 20 0 5517M 1264M 13248 S 0.0 10.9 1:16.08 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
20 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:01.05 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
33 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.25 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
36 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.36 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
17 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:34.36 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
38 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.86 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
21 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.08 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
42 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.70 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
58 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.22 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
13 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.95 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
35 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.39 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
40 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.31 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
34 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.85 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
37 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.37 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
24 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.09 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
10 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:21.94 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
11 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.90 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
12 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.93 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
14 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.01 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
15 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.02 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
16 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.00 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
19 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.06 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
22 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.02 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
23 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.00 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
25 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.06 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
28 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.00 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
29 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.00 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
31 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.04 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
32 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.04 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
39 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.74 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
41 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.25 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
44 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.12 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
45 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.02 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
46 root 20 0 5517M 1264M 13248 S 0.0 10.9 0:00.00 /docker-java-home/jre/bin/java -Djava.util.logging.config.file=/usr/local/tomcat/conf/logging.properties -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
/etc/systemd/system/tomcat.service
[Unit]
Description=Apache Tomcat Web Application Container
Wants=network.target
After=network.target
[Service]
Type=forking
Environment=JAVA_HOME=/usr/lib/jvm/java-1.8.0-openjdk-1.8.0.222.b10-0.el8_0.x86_64/jre
Environment=CATALINA_PID=/opt/tomcat/temp/tomcat.pid
Environment=CATALINA_HOME=/opt/tomcat
Environment='CATALINA_OPTS=-Xms512M -Xmx1G -Djava.net.preferIPv4Stack=true'
Environment='JAVA_OPTS=-Djava.awt.headless=true'
ExecStart=/opt/tomcat/bin/startup.sh
ExecStop=/opt/tomcat/bin/shutdown.sh
SuccessExitStatus=143
User=tomcat
Group=tomcat
UMask=0007
RestartSec=10
Restart=always
[Install]
WantedBy=multi-user.target
使 Tomcat 服务在系统启动时自动启动。
systemctl enable tomcat
答案1
您可能需要检查 tomcat home 中以下文件的内容：$CATALINA_HOME/conf/server.xml（如果您不确定它在哪里，只需定位 server.xml）并检查文件中的 maxThreads 和 minSpareThreads 设置。
基本上它主要用于高负载/高并发用户 - tomcat 设置。该设置只是告诉 tomcat 处理 http 请求所需/可以产生的线程的最小值和最大值。
希望这能回答你的问题