Implementing High Availability and Load Balancing in Helical Insight

In this document, we have explained how we can do load balancing in Helical Insight application using Tomcat. The cluster consists of a set of connected Tomcat Servers that work together so that, in many respects, they can be viewed as a single system. Each node sets to perform the same task, controlled and scheduled by the load balancer.

  1. Tools Used:
    1. Java JDK 1.8
    2. Apache Tomcat servers
    3. Apache httpd server
    4. Mod_jk connector
  2. Download and Install Tomcat:

    3. Download any version of tomcat (7.0+) and install it. This will act as one of the nodes and deploy Helical Insight application in it. In order to understand how to install Helical Insight application, please refer to this blog: Helical Insight Application Installation Guide

    Similarly, download and install another tomcat (version 7.0+) on a different port then already existing port and this will be another node. Again deploy Helical Insight application in it by referring the same Installation blog.

    Note: You are having 2 different tomcats running on different ports. But keep hi-repository and back end Helical Insight database (which stores User Role Management information) as common for both of these tomcat instances.

    Check and confirm that both tomcat instances are running and with both Helical Insight application is accessible.

  3. Download and Install Apache httpd server:

    4. Download apache server (version 2.0 +) and install it.

  4. Download mod_jk :

    Here Download mod_jk as zip or compressed file:

  5. mod_jk installation:

    6. Extract the mod_jk compressed file and copy the file “mod_jk.so” into the httpd server modules directory.

  6. Add mod_jk to the httpd.conf:

    7. Edit the “httpd.conf” file and add following lines:

    LoadModule jk_module modules/mod_jk.so

JkWorkersFile E:\Apache2.2\conf\workers.properties
JkShmFile     E:\Apache2.2\logs\mod_jk.shm
JkLogFile     E:\Apache2.2\logs\mod_jk.log
JkLogLevel    error
JkMount  /status  status
JkMount  /*  balancer

    Note: Modify paths according to your installation directory.

  7. Create the workers.properties file:

In the conf directory of the Apache httpd server, create a new text file with the name “workers.properties”

Edit this “workers.properties” file and put the following lines:

worker.list=balancer,status

worker.tomcat1.type=ajp13
worker.tomcat1.port=8009
worker.tomcat1.host=localhost

worker.tomcat2.type=ajp13
worker.tomcat2.port=8010
worker.tomcat2.host=localhost

worker.balancer.type=lb
worker.balancer.balance_workers=tomcat1,tomcat2

worker.status.type=status

From outside we have 2 visible workers: balancer and stat. All the request that comes to the balancer are managed by the balancer worker.

Restart apache httpd service.

At this point the Apache httpd server is working as a front end of the Tomcat Load Balancer.

Reference :
Apache Tomcat Load Balancing Tutorials

Now the request will get distributed between the various Helical Insight installations via apache tomcat.

If you have any queries please get us at support@helicalinsight.com

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