Installation of Tomcat7 : using port 80

 Installation Tomcat using apt-get  
 sudo apt-get install tomcat7  

 Install the package using apt-get  
 sudo apt-get install tomcat7-docs  
 sudo apt-get install tomcat7-examples  
 sudo apt-get install tomcat7-admin  

 The above instruction is more than enough to install the tomcat. If any error happened please follow the below the instructions.  
 Setup the JDK path for Tomcat   
 sudo nano /etc/default/tomcat7 : add the JDK path inside the file  
 Set the path   
 sudo nano ~/.bashrc  
 export CATALINA_HOME=/usr/share/tomcat7  

 Stop Server:  
 sudo /etc/init.d/tomcat7 stop  

 Start Server:  
 sudo /etc/init.d/tomcat7 start  

 Folder locations of tomcat :  
 Tomcat bin and lib file location :  
 /usr/share/tomcat7  

 Tomcat xml file :  
 /etc/tomcat7  

 Tomcat config and webapp files:  
 /var/lib/tomcat7/  

 Tomcat JDK and Path Setup   
 sudo nano /etc/default/tomcat7  

 To Run Tomcat on port 80  
 <Connector port="8080" protocol="HTTP/1.1"  
 connectionTimeout="20000" redirectPort=  
 "8443" />  
 Change 8080 to 80 in /config/server.xml file  
  AND  

 Remove the comment using :  
 sudo nano /etc/default/tomcat7 and   
 change #AUTHBIND=no  
 as AUTHBIND=yes  

 To remove all the files   
 sudo apt-get purge libtomcat7-java tomcat6 tomcat6-admin tomcat6-docs tomcat6-examples tomcat7 tomcat7-admin tomcat7-common tomcat7-docs tomcat7-examples tomcat7-user  
 To check what are the process running on port 80  
 netstat -tulpn | grep :80  
 Server.XML user name and password  
 <role rolename="manager-gui"/>  
 <user username="Dhanu" password="" roles="manager-gui"/>  
 <role rolename="admin-gui"/>  
 <user username="Dhanu" password="" roles="admin-gui"/> 

 
 NOTE:  
 Change the Heap memory in tomcat :  
 sudo nano /etc/default/tomcat7 and change the line on -Xms value  
 JAVA_OPTS="-Djava.awt.headless=true -Xmx2048m -XX:+UseConcMarkSweepGC"  
 In Default It’s limited to 128MB.