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Tomcat8 setenv.sh
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# | |
# Cutom Environment Variables for Tomcat | |
# | |
############################################ | |
export JAVA_HOME=/usr/lib/jvm/java-7-oracle/jre | |
export PATH=${JAVA_HOME}/bin:${PATH} | |
############################################ | |
# | |
# JAVA_OPTS | |
# You could do all this in one export command | |
# But I am going to be long winded and explain | |
# Why and add links | |
# | |
# Oracle Notes | |
# - https://docs.oracle.com/javase/8/docs/technotes/tools/windows/java.html | |
# - A good visual | |
# https://redstack.wordpress.com/2011/01/06/visualising-garbage-collection-in-the-jvm/ | |
############################################# | |
# -server | |
# Select the java HotSpot Server JVM | |
# The 64-bit version of the JDK support only the Server VM, | |
# so in that case the option is implicit | |
# ... so it's redundant to today's world but it make me feel good. | |
export JAVA_OPTS="-server" | |
# -Xms/Xmx | |
# Xms Sets the initial size of the Heap | |
# Xmx sets the Maximum size of the Heap. | |
# http://stackoverflow.com/questions/16087153/what-happens-when-we-set-xmx-and-xms-equal-size | |
# http://crunchify.com/jvm-tuning-heapsize-stacksize-garbage-collection-fundamental/ | |
export JAVA_OPTS="$JAVA_OPTS -Xms1024M -Xmx1024M" | |
# -NewSize/MaxNewSize | |
# Set the size of the young generation | |
# Most newly created objects are made here | |
# Objects taht did not become unreachbale and survice the young | |
# Generation heap are copied to the Old Generation | |
# See http://www.cubrid.org/blog/dev-platform/understanding-java-garbage-collection | |
# https://redstack.wordpress.com/2011/01/06/visualising-garbage-collection-in-the-jvm/ | |
export JAVA_OPTS="$JAVA_OPTS -XX:NewSize=512m -XX:MaxNewSize=512m" | |
# -PermSize/MaxPermSize | |
# Store classes and interned character strings | |
# http://stackoverflow.com/questions/12114174/what-does-xxmaxpermsize-do | |
# Warning! | |
# Decprecated in Java 8!! replace -XX:MetaspaceSize !!! | |
export JAVA_OPTS="$JAVA_OPTS -XX:PermSize=256m -XX:MaxPermSize=256m" | |
# -UseConcMarkSweepGC | |
# Also called the low latency GC since pausing time is very short | |
# When this is enabled it also enabled | |
# -XX:+UseParNewGC Potentially speed up your generation GC | |
# by a factor equal to the number of CPUS | |
# (see http://stackoverflow.com/questions/2101518/difference-between-xxuseparallelgc-and-xxuseparnewgc) | |
# http://www.cubrid.org/blog/dev-platform/understanding-java-garbage-collection/ | |
export JAVA_OPTS="$JAVA_OPTS -XX:+UseConcMarkSweepGC" | |
# -XX:+CMSIncrementalMode | |
# | |
# I am not going to set this one but it's worthe mentioning | |
# It has been deprecated in Java 8. It is useful when you have 1 or 2 | |
# CPU machine. It helps reduce latency by doing smaller garbage collections | |
# see thies sites for details | |
# http://www.fixdeveloper.com/2014/03/jvm-tuning-cmsincrementalmode-overrides.html | |
# http://www.oracle.com/technetwork/java/javase/gc-tuning-6-140523.html#icms | |
# -CMSClassUnloadingEnabled | |
# In an old school java program classes are forever. But with | |
# Modern languages like Groovy... Classes are created at runtime, every | |
# scirpt may create a few new classes. With this set the PermGen space will | |
# Be garbage collecte3d. Without this you have a memory Leak. | |
# | |
# Must also have UseConcMarkSweepGC set for this to work. | |
# | |
# http://stackoverflow.com/questions/3334911/what-does-jvm-flag-cmsclassunloadingenabled-actually-do | |
export JAVA_OPTS="$JAVA_OPTS -XX:+CMSClassUnloadingEnabled" | |
# -DisableExlicitGC | |
# Explicit calls to System.gc() are completely ignored | |
# | |
# http://stackoverflow.com/questions/12847151/setting-xxdisableexplicitgc-in-production-what-could-go-wrong | |
export JAVA_OPTS="$JAVA_OPTS -XX:+DisableExplicitGC" | |
# -HeapDumpPath | |
# Set the file where the heap dump will write out its error | |
export JAVA_OPTS="$JAVA_OPTS -XX:HeapDumpPath=/10x13/logs/tomcat8/java_heapdump_pid_%p.log" | |
# -java.awt.headless | |
# Basically tell the JVM not to load awt libraries | |
# Your server is not a desktop app, there is more to this rule than that. | |
# If you want to go into it check out. | |
# https://blog.idrsolutions.com/2013/08/what-is-headless-mode-in-java/ | |
# http://www.oracle.com/technetwork/articles/javase/headless-136834.html | |
export JAVA_OPTS="$JAVA_OPTS -Djava.awt.headless=true" | |
# -java.security.egd | |
# This one is abit of a debate | |
# If you don't set this it will use /dev/random on startup | |
# which can block and make tomcat startup slower. | |
# But it's technically more secure... but no one has shown | |
# a way to break the results of urandom which is faster. | |
# For more details see. | |
# http://www.2uo.de/myths-about-urandom/ | |
export JAVA_OPTS="$JAVA_OPTS -Djava.security.egd=file:/dev/./urandom" | |
################################################# | |
# CATALINA_OPTS | |
# This are basically JAVA_OPTS but only used by tomcat | |
# and only run on Tomcat start see | |
# http://stackoverflow.com/questions/11222365/catalina-opts-vs-java-opts-what-is-the-difference | |
# for more details | |
# | |
################################################ | |
# -jmcremot.. | |
# Turn onthe jmxremote so you can use JConsole or VisualVM | |
# to monito the jvm remotely | |
# See | |
# https://tomcat.apache.org/tomcat-7.0-doc/monitoring.html | |
# http://www.mkyong.com/tomcat/jconsole-jmx-remote-access-on-tomcat/ | |
# http://www.javaworld.com/article/2072322/from-jconsole-to-visualvm.html | |
export CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote" | |
export CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote.port=9090" | |
export CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote.authenticate=false" | |
export CATALINA_OPTS="$CATALINA_OPTS -Dcom.sun.management.jmxremote.ssl=false" | |
#This gets the local IP address | |
IP_ADDR=`ip route get 8.8.8.8 | awk '{print $NF; exit}'` | |
export CATALINA_OPTS="$CATALINA_OPTS -Djava.rmi.server.hostname=$IP_ADDR" | |
export CATALINA_HOME=/10x13/apps/tomcat8 | |
export CATALINA_OUT=/10x13/logs/tomcat8/catalina.out | |
export CATALINA_PID=/var/run/tomcat8/tomcat.pid |
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