tomcat 7 setup guide

Tomcat Setup guide
this setup was done on centos 7

Tomcat 7
This is my own setup guide for my server.
you can change according to your need

Download the package from https://tomcat.apache.org/download-70.cgi

Choose “Core” -> tar.gz to download

Tomcat 7.0 is designed to run on Java SE 6 and later. So download the appropriate version

For more info, you can Read the RELEASE-NOTES and the RUNNING.txt file in the distribution for more details.

For easy installation, I download rpm and use localinstall from Oracle website

# yum localinstall jdk-7u80-linux-x64.rpm

Installation

1      Extract the file and put it at /opt

# tar -zxvf apache-tomcat-7.0.62.tar.gz



2   Install tomcat native

# cd /opt/apache-tomcat-7.0.62/bin
# tar -zxvf tomcat-native.tar.gz
# cd tomcat-native-1.1.33-src/jni/native

Build tc-native requires three components to be installed:
- APR library
- OpenSSL libraries
- Java SE Development Kit (JDK)

# yum install apr-devel openssl-devel

Now proceed to install the native using this command

# ./configure --with-apr=/usr/bin/apr-1-config --with-java-home=/usr/java/jdk1.7.0_80/ --with-ssl=yes --prefix=/usr

p/s:- Update the java location accordingly

3    Install common-daemon-native

# cd /opt/apache-tomcat-7.0.62/bin
# tar –zxvf commons-daemon-native.tar.gz
# cd commons-daemon-1.0.15-native-src/unix
# ./configure
# cp jsvc ../..

Tuning

1       Edit /opt/apache-tomcat-7.0.62/conf/server.xml

Search connectionTimeout and change the value to 600000

Search maxThreads and change the value to 500 (if got enable)

2       Edit /conf/context.xml

Change all <Context>

To <Context swallowOutput="true">

( it is use to redirect system err to catalina)

3       Edit conf/logging.properties, and add this

1catalina.org.apache.juli.AsyncFileHandler.rotatable = true

( it is use to rotate the log)

4       Create setenv.sh at bin directory and add this into it

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JAVA_OPTS="-Xms4096m -Xmx4096m -XX:MaxPermSize=512m -Dorg.jboss.resolver.warning=true -Dsun.rmi.dgc.client.gcInterval=3600000 -Dsun.rmi.dgc.server.gcInterval=3600000 -Dsun.lang.ClassLoader.allowArraySyntax=true -Dhttp.maxConnections=500 -XX:+UseConcMarkSweepGC -XX:+CMSIncrementalMode"

# Set the -Xms and -Xmx the same, around 50% to 80% of total memory

# Set the PermSize to either 256 or 512, increase it if there’s OutOfMemoryError PermGen space in log

# to see gc memory, add "-XX:+PrintGCDetails -XX:+PrintGCTimeStamps -verbose:gc -Xloggc:/tmp/gc.log"

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Startup script

# vim /etc/init.d/tomcat

#!/bin/sh

#

# Tomcat startup script

#

# chkconfig: - 85 15

# description: Tomcat Server

# processname: tomcat

#

# To use this script run it as root - it will switch to the specified user

#

# Either modify this script for your requirements or just ensure that

# the following variables are set correctly before calling the script.

#define where tomcat is - this is the directory containing directories log, bin, conf etc

CATALINA_HOME=${CATALINA_HOME:-"/opt/tomcat"}

export CATALINA_HOME

#define the user under which jboss will run, or use 'RUNASIS' to run as the current user

TOMCAT_USER=${TOMCAT_USER:-"tomcat"}

export TOMCAT_USER

#make sure java is in your path

JAVA_HOME=${JAVA_HOME:-"/usr/java/jdk"}

export JAVA_HOME

case "$1" in

start)

    $CATALINA_HOME/bin/daemon.sh start

    ;;

stop)

    $CATALINA_HOME/bin/daemon.sh stop

    rm -rf $TOMCAT_HOME/work/*

    ;;

restart)

    $0 stop

    i=0

    while [ `ps ax|grep -v grep|grep jsvc|wc -l` -gt 0 -a $i -lt 60 ]

    do

     sleep 1

     (( i += 1 ))

    done

    /usr/bin/killall -9 jsvc

    $0 start

    ;;

*)

    echo "usage: $0 (start|stop|restart|help)"

esac



edit the java location and tomcat location
then change its permission

# chmod 755 /etc/init.d/tomcat
then create tomcat user

# useradd –s /sbin/nologin tomcat

Change tomcat permission to tomcat

# chown -R tomcat:tomcat apache-tomcat-7.0.62



Add to startup list

# chkconfig --add tomcat

# chkconfig --level 2345 tomcat on

Connect to mysql

Get the JDBC driver and put to lib
http://www.mysql.com/products/connector/

Edit conf/context.xml
Add under <Context swallowOutput="true">
Below is the example format

--------------------------------------------------------------------------------------------------------------
<Resource name="jdbc/TestDB" auth="Container" type="javax.sql.DataSource"
maxActive="100" maxIdle="30" maxWait="10000"
username="javauser" password="javadude" driverClassName="com.mysql.jdbc.Driver"
url="jdbc:mysql://localhost:3306/javatest"/>

--------------------------------------------------------------------------------------------------------------

change the word in red accordingly

maxActive = Maximum number of database connections in pool. Make sure you configure your.

mysqld max_connections large enough to handle all of your db connections. Set to -1 for no limit.
maxIdle = Maximum number of idle database connections to retain in pool. Set to -1 for no limit.
maxWait = Maximum time to wait for a database connection to become available in ms, An Exception is thrown if this timeout is exceeded. Set to -1 to wait indefinitely.

Apache

Install apache and fine tune it

1. Install MOD_JK connector

# yum install httpd-devel

Go to https://tomcat.apache.org/download-connectors.cgi and download the source
Configure, make and make install
copy binary file to /etc/http/modules

p/s = if got error saying "error: Cannot find the WebServer"
use this function to find apxs
# find / -iname apxs
then install using this command
# configure --with-apxs=/usr/bin/apxs

# chmod 755 /etc/httpd/modules/mod_jk.so


Create workers.properties
Change the node name according to the same as the servers name. If you follow the startup, location is define in mod_jk.conf

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worker.list=worker1,node1,node2,status #node name you want to use add this in server.xml
worker.jkstatus.type=status

#node1
worker.node1.port=8009
worker.node1.host=10.0.3.129
worker.node1.type=ajp13
worker.node1.lbfactor=1
worker.node1.ping_mode=A
#worker.node1.cachesize=10

#node2
worker.node2.port=8009
worker.node2.host=10.0.3.130
worker.node2.type=ajp13
worker.node2.lbfactor=3
worker.node2.ping_mode=A
#worker.node2.cachesize=10

# Load-balancing behaviour
worker.worker1.type=lb
worker.worker1.balance_workers=node1,node2
worker.worker1.sticky_session=1

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Create mod_jk.conf

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LoadModule jk_module modules/mod_jk.so

<IfModule mod_jk.c>
JkWorkersFile /data/sys/etc/httpd/workers.properties
JkShmFile /var/log/httpd/mod_jk.shm
JkLogFile /var/log/httpd/mod_jk.log
JkLogLevel info,debug
JkLogStampFormat "[%a %b %d %H:%M:%S %Y] "


JkMount /app/* worker1 #mount this url, edit as neccessary
# DO NOT MOUNT EVERYTHING!
</IfModule>

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