Auf meinem Centos 7 läuft ein Tomcat 9-Server.
Wenn ich den Befehl abgebe, htopwird ein Tomcat-Prozess mehrmals aufgeführt und ich möchte verstehen, warum er mehrmals angezeigt wird
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
Aktivieren Sie den Tomcat-Dienst für den automatischen Start beim Systemstart.
systemctl enable tomcat
Antwort1
Sie sollten den Inhalt der folgenden Datei in Ihrem Tomcat-Home überprüfen: $CATALINA_HOME/conf/server.xml (führen Sie einfach „locate server.xml“ aus, wenn Sie nicht sicher sind, wo sie sich befindet) und überprüfen Sie die maxThreads- und minSpareThreads-Einstellungen in Ihrer Datei.
Im Grunde wird es hauptsächlich bei Tomcat-Setups mit hoher Auslastung/hoher Anzahl gleichzeitiger Benutzer verwendet. Die Einstellung dient lediglich dazu, Tomcat die Mindest- und Höchstzahl an Threads mitzuteilen, die er benötigt/erstellen kann, um die HTTP-Anfragen zu verarbeiten.
hoffe das beantwortet deine Frage