Tomcat and Apache2 with mod_jk on Ubuntu 14.04

I assume that you have got apache2 and tomcat installed and running on your ubuntu14/ubuntu12 server
I assume that tomcat is running on below URL
http://localhost:8080/tomcat/apps/

Installing and configuring mod_jk 

sudo apt-get install libapache2-mod-jk

First lets enable the redirect port 8443 on Tomcat

Step 1: Configure Tomcat
stop tomcat.
sudo /etc/init.d/tomcat stop

Enable the AJP Connector on the Tomcat container hosting JIRA by uncommenting the following element in $TOMCAT_HOME/conf/server.xml:

<Connector port="8009" URIEncoding="UTF-8" enableLookups="false" protocol="AJP/1.3" />
Start tomcat.
Test that app is accessible on the standard HTTP connector, for example http://appserver:8080. This is to ensure that Tomcat has successfully restarted.

Now we will create our workers.properties file for Apache.

sudo vim /etc/apache2/workers.properties
and paste the below lines in the file

# Define 1 real worker using ajp13
worker.list=worker1
# Set properties for worker (ajp13)
worker.worker1.type=ajp13
worker.worker1.host=localhost
worker.worker1.port=8009

Now to ask Apache to use this worker

sudo vim /etc/apache2/mods-available/jk.conf

change the JkWorkersFile property to /etc/apache2/workers.properties
JkWorkersFile  /etc/apache2/workers.properties
JkLogFile /var/log/apache2/mod_jk.log

Finally to configure the URL Apache should pass through the Tomcat, for this create new site

sudo vim /etc/apache2/sites-available/app.conf

and add the following line in your configuration
<VirtualHost *:80>
.......................................
.......................................
JkMount /tomcat-demo* worker1
</VirtualHost>

Enable the site, execute the below command or create soft link to
a2ensite app.conf

Now, restart the servers

sudo /etc/init.d/tomcat restart
sudo /etc/init.d/apache2 restart

Testing:

Both URL should provide the similar result
http://localhost/tomcat/apps/
http://localhost:8080/tomcat/apps/