What is Apache tomcat?

Ans: An ApacheTomcat is an open source web application server which supports J2ee Servlets, JavaServer, Pages (JSP) and API's. Tomcat should not be confused with Apache web server which an HTTP web server.
–From Wikipedia.

Some terminology about Apache tomcat.

An Apache Tomcat can be configured by editing server.xml file. This server.xml file of Tomcat can take as  synonyms to httpd.conf file for Apache web server.

Servlet is defined as a way add dynamic content to a Web server using the Java platform. A servlet container is a compiled, executable program. The servlet container name of Tomcat is called as Catalina.

Prerequisite for Apache tomcat are

  1. java
  2. JDK

Step by step for installing Apache tomcat

Note: Avoide installing tomcat from repositories, always prefer to install it from source downloaded from Apache site.

Step1: Install all the prerequisites

Redhat:

#yum install java

Ubuntu:

#apt-get install java

Step2: Download tomcat source package and uncompress it.


Redhat/Ubuntu
 

Step3: Setup the paths for Catalina and others.
 

Setting catalina paths in Redhat/Ubuntu Linux

CATALINA_HOME=/opt/apache-tomcat-6.0.29
CATALINA_BASE=/opt/apache-tomcat-6.0.29

Setting java paths

Check what java versions are installed in your system

#update-alternatives –config java

This command will display default java version information used in your machine.

Example output :

# update-alternatives –config java

There are two programs which provide 'java'.

Selection Command
———————————————–
1 /usr/lib/jvm/jre-1.4.2-gcj/bin/java
*+2 /usr/lib/jvm/jre-1.6.0-openjdk/bin/java

Enter to keep the current selection[+], or type selection number:

If you see above the default java version is 1.6 so set the path to /usr/lib/jvm/jre-1.6.0-openjdk (* indicates the default version). Now set the path as shown below.

JAVA_HOME=/usr/lib/jvm/jre-1.6.0-openjdk
JDK_HOMe=$JAVA_HOME

Step4: Now start tomcat server

#/opt/apache-tomcat-6.0.29/bin/sartup.sh

Sample output.

Using CATALINA_BASE: /opt/apache-tomcat-5.5.26
Using CATALINA_HOME: /opt/apache-tomcat-5.5.26
Using CATALINA_TMPDIR: /opt/apache-tomcat-5.5.26/temp
Using JRE_HOME:
/usr/lib/jvm/java-1.6.0-openjdk-1.6.0.0/

Step5: By default Apache Tomcat will be hosted on localhost : 8080 port by default. So try to access the site with your favorite web browser

Stay tuned to other posts about troubleshooting tomcat installation.

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