Dlaczego tomcat8 na debianie9 uruchamia tyle procesów?

Witajcie,

Mam pytanie dotyczące tomcat 8. Mianowicie niedawno przeniosłem VPS na nowy hosting. Stoi tam tomcat 8. Nie pytajcie dlaczego ale tak musi być i już ;) Sęk w tym, że zużycie RAM na stronie hostingu pokazuje mi 100%. Postanowiłem więc sprawdzić od wewnątrz poprzez narzędzie htop o co chodzi. No i zasadniczo zużycie RAM'u oscyluje w okolicach 1GB (nie jest źle) czyli połowę dostępnej pamięci RAM (tak tak jeden z najtańszych hostingów 2 CPU i 2GB Ram) jednak zaskoczył mnie taki widok:

Tomcat mimo, iż stoją tam tylko dwie mocno statyczne strony (takie typowe wizytówki) jedna to czysty html i css w drugiej jest jeszcze jquery zżera 8% pamięci RAM i uruchamia ponad 30 wątków ... z tego co udało mi się wyczytać to są procesy logowania ale nie mam pojęcia czemu tyle tego jest? Czy ktoś bardziej biegły w tomcat mógłby rzucić okiem i coś podpowiedzieć / wytłumaczyć?

Będę dozgonnie wdzięczny za każdą informację

Przejrzyj logi, bez tego można tylko gdybać. Może np jakiś bot przypuścił atak na twój serwer i próbuje otwierać panel administracyjny tomcata

Hmmm no mam coś takiego:

04-Jan-2018 09:35:10.428 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deploying web application directory /var/lib/tomcat8/webapps/portfolio
04-Jan-2018 09:35:11.734 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner.scanResourcePaths No TLD files were found in resource path [/WEB-INF/].
04-Jan-2018 09:35:11.736 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/var/lib/tomcat8/webapps/portfolio/WEB-INF/lib/urlrewritefilter-4.0.3.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.741 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/var/lib/tomcat8/webapps/portfolio/WEB-INF/lib/ojdbc6.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.742 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/var/lib/tomcat8/webapps/portfolio/WEB-INF/lib/orai18n.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.742 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/var/lib/tomcat8/webapps/portfolio/WEB-INF/lib/activation.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.744 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/var/lib/tomcat8/webapps/portfolio/WEB-INF/lib/postgresql-42.1.4.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.747 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-storeconfig-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.749 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-jni-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.751 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-catalina-jmx-remote-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.753 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-i18n-es-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.755 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-jasper-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.758 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-tribes-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.758 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-websocket-api-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.761 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-annotations-api-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.763 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-catalina-ha-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.764 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-i18n-fr-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.766 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-websocket-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.767 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-servlet-api-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.777 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-catalina-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.778 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-el-api-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.779 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-api-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.781 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-coyote-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.782 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-i18n-ja-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.784 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-jsp-api-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.786 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-jdbc-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.787 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-util-scan-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.792 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-catalina-ant-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.793 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-jasper-el-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.796 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-jaspic-api-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.798 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-util-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.799 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-dbcp-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.800 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/ecj.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.802 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/el-api-3.0.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.804 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/jsp-api-2.3.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.813 FINE [localhost-startStop-1] org.apache.jasper.servlet.TldScanner$TldScannerCallback.scan No TLD files were found in [file:/usr/share/java/tomcat8-juli-8.5.14.jar]. Consider adding the JAR to the tomcat.util.scan.StandardJarScanFilter.jarsToSkip property in CATALINA_BASE/conf/catalina.properties file.
04-Jan-2018 09:35:11.814 INFO [localhost-startStop-1] org.apache.jasper.servlet.TldScanner.scanJars At least one JAR was scanned for TLDs yet contained no TLDs. Enable debug logging for this logger for a complete list of JARs that were scanned but no TLDs were found in them. Skipping unneeded JARs during scanning can improve startup time and JSP compilation time.
DEBUG:Jan 4, 2018 9:35:11 AM:Init
04-Jan-2018 09:35:11.952 INFO [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployDirectory Deployment of web application directory /var/lib/tomcat8/webapps/portfolio has finished in 1,524 ms

Przestawiłem w logging.properties

org.apache.jasper.servlet.TldScanner.level = SEVERE

więc wpisy zniknęły z loga ale dalej w htop jest to samo. Żadnych prób accessa nie ma z adresów innych niż mój więc raczej to nie żaden bot ... jakieś pomysły?

A ile masz tych watkow? ps -eLf | grep java |grep tomcat |wc -l Moze poeksperymentuj z ustawieniami z ponizszego posta jak chcesz zmienjszyc ( u mnie w pracy wersja developerska produktu ma ponad 1000)

https://serverfault.com/questions/644417/how-to-limit-the-number-of-tomcat-threads

Po operacji z Twojego linka zeszło z 34 do 20 ...:) Niestety to jest jakieś absolutne minimum bo ustawienie niższej wartości i tak nic nie daje. No nic pozostaje zostawić to tak jak jest. Przynajmniej teraz wiem co to za wątki i skąd ich tyle.