How to Bind Port 80 to Tomcat 7 in Ubuntu

Default tomcat installation uses 8080 port. This is not preferred way when you present your web application over a top-level domain. I needed this information for my new sites gamenism.com/game and onlineuml.net/modeler. Below I am describing how to bind port 80 to Tomcat 7.

• Backup /var/lib/tomcat7/conf/server.xml
• Open /var/lib/tomcat7/conf/server.xml for editing. Find the part beginning with "<Connector"
  As highlighted below, change the value of port attribute to 80.
  
  <Connector port="80" protocol="HTTP/1.1"    connectionTimeout="20000"   
      URIEncoding="UTF-8"   
      redirectPort="8443" />

• Backup /etc/default/tomcat7 file
• Open /etc/default/tomcat7 file for editing. 

• Find the line containing "AUTHBIND" property. This line should be commented. Uncomment it.
• Set AUTHBIND property to YES. This is required to bind a port to a process which is less than 1023.
  
  AUTHBIND=yes

• Restart tomcat 7
  
  sudo /etc/init.t/tomcat7 restart