Tomcat16-Multiple-Instances

Running Multiple Tomcat Instances on a Single Server Setup

• Be sure you have installed JDK-8 and check the following variables

# env | grep JAVA
JAVA_HOME=/opt/jdk8

# env | grep JRE
JRE_HOME=/opt/jdk8/jre

• Add tomcat user and group

# groupadd tomcat
# useradd -M -s /sbin/nologin -g tomcat -d /opt/tomcat tomcat

• Have the tomcat base downloaded to your machine and extreact those to /opt/tomcat-src
• In my case I already have tomcat downloaded. So I am going to extract those

# mkdir /opt/tomcat-src
# tar -xzvf ~/apache-tomcat-8.5.11.tar.gz -C tomcat-src/ --strip-components=1

• Let us create 2 directories for our tomcat instances

# mkdir /opt/tomcat{1,2}

• Copy the contents of tomcat-src to tomcat1 and tomcat2

# cp -prf /opt/tomcat-src/* /opt/tomcat1
# cp -prf /opt/tomcat-src/* /opt/tomcat2

• Let us change the permissions of some directories in tomcat1 and tomcat2

# cd tomcat1/
# chgrp -R tomcat conf
# chmod g+rwx conf/
# chmod g+r conf/*
# chown -R tomcat work/ temp/ logs/

# cd tomcat2/
# chgrp -R tomcat conf
# chmod g+rwx conf/
# chmod g+r conf/*
# chown -R tomcat work/ temp/ logs/

• Now we need to change the configs to change the ports as we know each instance should have some distinct ports to listen on.

[TOMCAT1]

Shutdown Port ->      7005
Web Port  ->      7080
Redirect Port ->      7443
AJP Conn. Port ->      7009

[TOMCAT2]

Shutdown Port   ->      8005
Web Port        ->      8080
Redirect Port   ->      8443
AJP Conn. Port  ->      8009

• Please refer to Basic Clustering to know how to change the ports also to know how can these tomcat instances be run in a clustered environment to balance the load