Tengo un servidor Tomcat 9 ejecutándose en mi Centos 7.
Cuando emito el htopcomando, tengo un proceso de Tomcat que aparece varias veces y me gustaría entender por qué aparece varias veces.
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.servicio
[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
Habilite el servicio Tomcat para que se inicie automáticamente al iniciar el sistema.
systemctl enable tomcat
Respuesta1
Es posible que desee verificar el contenido del siguiente archivo en su inicio de Tomcat: $CATALINA_HOME/conf/server.xml (simplemente localice server.xml si no está seguro de dónde está) y verifique las configuraciones de maxThreads y minSpareThreads en su archivo.
Básicamente, se usa principalmente en usuarios de carga pesada/alta concurrencia: configuraciones de Tomcat. La configuración es solo para indicarle a Tomcat el mínimo y el máximo de subprocesos que necesita/puede generar para manejar las solicitudes http.
Espero que esto responda a su pregunta