How to modify JVM memory configuration in Tomcat8 under Linux

How to modify the JVM memory configuration in Tomcat8

Tomcat and It is not recommended to configure variables directly in catalina.sh, instead write them in the same directory as catalina ( bin directory) setenv.sh.

So if we want to modify the memory configuration of jvm

then we need to modify the setenv.sh file (not by default, we need to create a new setenv.sh ), write (the size can be modified according to your own situation):

export CATALINA_OPTS="$CATALINA_OPTS -Xms1000m"
export CATALINA_OPTS="$CATALINA_OPTS -Xmx1000m"
export CATALINA_OPTS="$CATALINA_OPTS -XX:MaxPermSize=256m"

After setting, start Tomcat

You will find:

cation directory [/usr/local/apache-tomcat-8.5.33/webapps/manager] has finished in [11] ms
06-Sep-2018 14:18:17.690 信息 [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["http-nio-8088"]
06-Sep-2018 14:18:17.702 信息 [main] org.apache.coyote.AbstractProtocol.start Starting ProtocolHandler ["ajp-nio-8009"]
06-Sep-2018 14:18:17.707 信息 [main] org.apache.catalina.startup.Catalina.start Server startup in 10577 ms
[INFO] Working directory is /usr/local/apache-tomcat-8.5.33
[INFO] War root is /usr/local/apache-tomcat-8.5.33/webapps/cat
Java HotSpot(TM) 64-Bit Server VM warning: ignoring option MaxPermSize=256m; support was removed in 8.0
06-Sep-2018 14:55:15.068 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server version:        Apache Tomcat/8.5.33
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server built:          Aug 12 2018 08:20:08 UTC
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Server number:         8.5.33.0
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log OS Name:               Linux
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log OS Version:            3.10.0-229.el7.x86_64
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Architecture:          amd64
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Java Home:             /usr/local/jdk1.8.0_171/jre
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Version:           1.8.0_171-b11
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log JVM Vendor:            Oracle Corporation
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_BASE:         /usr/local/apache-tomcat-8.5.33
06-Sep-2018 14:55:15.073 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log CATALINA_HOME:         /usr/local/apache-tomcat-8.5.33
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.config.file=/usr/local/apache-tomcat-8.5.33/conf/logging.properties
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.util.logging.manager=org.apache.juli.ClassLoaderLogManager
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djdk.tls.ephemeralDHKeySize=2048
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.protocol.handler.pkgs=org.apache.catalina.webresources
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dorg.apache.catalina.security.SecurityListener.UMASK=0027
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Xms1000m
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Xmx1000m
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -XX:MaxPermSize=256m
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dignore.endorsed.dirs=
06-Sep-2018 14:55:15.074 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.base=/usr/local/apache-tomcat-8.5.33
06-Sep-2018 14:55:15.075 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Dcatalina.home=/usr/local/apache-tomcat-8.5.33
06-Sep-2018 14:55:15.075 信息 [main] org.apache.catalina.startup.VersionLoggerListener.log Command line argument: -Djava.io.tmpdir=/usr/local/apache-tomcat-8.5.33/temp
06-Sep-2018 14:55:15.075 信息 [main] org.apache.catalina.core.AprLifecycleListener.lifecycleEvent The APR based Apache Tomcat Native library which allows optimal performance in production environments was not found on the java.library.path: [/usr/java/packages/lib/amd64:/usr/lib64:/lib64:/lib:/usr/lib]
06-Sep-2018 14:55:15.236 信息 [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["http-nio-8088"]
06-Sep-2018 14:55:15.248 信息 [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
06-Sep-2018 14:55:15.255 信息 [main] org.apache.coyote.AbstractProtocol.init Initializing ProtocolHandler ["ajp-nio-8009"]
06-Sep-2018 14:55:15.257 信息 [main] org.apache.tomcat.util.net.NioSelectorPool.getSharedSelector Using a shared selector for servlet write/read
06-Sep-2018 14:55:15.259 信息 [main] org.apache.catalina.startup.Catalina.load Initialization processed in 602 ms
06-Sep-2018 14:55:15.302 信息 [main] org.apache.catalina.core.StandardService.startInternal Starting service [Catalina]
06-Sep-2018 14:55:15.302 信息 [main] org.apache.catalina.core.StandardEngine.startInternal Starting Servlet Engine: Apache Tomcat/8.5.33
06-Sep-2018 14:55:15.327 信息 [localhost-startStop-1] org.apache.catalina.startup.HostConfig.deployWAR Deploying web application archive [/usr/local/apache-tomcat-8.5.33/webapps/cat.war]
06-Sep-2018 14:55:18.042 信息 [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.
06-Sep-2018 14:55:33.944 警告 [localhost-startStop-1] org.apache.catalina.util.SessionIdGeneratorBase.createSecureRandom Creation of SecureRandom instance for session ID generation using [SHA1PRNG] took [15,876] milliseconds.
Logger file /data/applogs/cat/cat_20180906.log 

[root@localhost bin]# ./startup.sh 
Using CATALINA_BASE:   /usr/local/apache-tomcat-8.5.33
Using CATALINA_HOME:   /usr/local/apache-tomcat-8.5.33
Using CATALINA_TMPDIR: /usr/local/apache-tomcat-8.5.33/temp
Using JRE_HOME:        /usr/local/jdk1.8.0_171/jre
Using CLASSPATH:       /usr/local/apache-tomcat-8.5.33/bin/bootstrap.jar:/usr/local/apache-tomcat-8.5.33/bin/tomcat-juli.jar
Tomcat started.
[root@localhost bin]# uname -a
Linux localhost.localdomain 3.10.0-229.el7.x86_64 #1 SMP Fri Mar 6 11:36:42 UTC 2015 x86_64 x86_64 x86_64 GNU/Linux
[root@localhost bin]# 

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