Configure VisualVM on Ubuntu 14.10

VisualVM is a kind of data gathering software for application which are running under the Java Virtual Machines (JVM). This retrieve information related to the Java application, like heap size, heap dumps, RAM utilization, CPU utilization, thread count and so on. There is an special interface that they use for getting information from application ends and gathered information is analyzed and displayed on the VisualVM dashboard. Remote application also can be monitored via VisualVM. Specially user can get snapshot of heat dumps also.
Follow the steps to install VisualVM on Ubuntu server.
# sudo apt-get install visualvm
# which viaualvm
# java -version
 
You can check the java is up & running up using the commands given above. And for testing purpose, I’m here using a Java testing application in the same host. Let’s open the visualVM and configure it to get the information of running applications.
# visualvm
 
if you need any help related to visualVM you can us,
# visualvm – -help

After open the VisualVM, then you will see the terms and condition that should be accepted. Please accept it and go ahead.

C-UsersmaduradPicturesVisualVm License Agreement

After you agreed to the license agreement you will be displayed the VisualVM home page. In this home page you can see the options that you are having on VisualVm. In the Left side all the options are available. The image given below shows the sample home page of VisualVM.
C-UsersmaduradPicturesVisualVM HomePage
To test an application, here I’m going to run a test application which contains a digital clock.

DemoApp

Download this file and extract, then run the testing java application on a terminal, then you will see the Digital clock on a particular application window.
# sudo unzip demo.zip
# cd src/
# javac DemoApp.java
# java DemoApp
 
After running the testing application, you will see the analytics of the application on the VisualVM dashboard. Locally running all the applications are added automatically to the VisualVM. Sample dashboard image is given below.
C-UsersmaduradPicturesVisualVM dashboard.png
In Visual VM dashboard consist of the four tabs. The descriptions for each tabs are given below.
  • Overview : Contains PID, Host name, arguments, heap dumb, so on, this provides basic idea of the running application.
  • Monitor : Processor consuming, memori consuming likewise utilisation detail.
  • Threads : List of entire threads, state of threads, running time, and so on.
  • Sampler : Sampling information, like CPU, memory.
 
Finally, I can state that VisualVM can be used to get analytics and mange Java based applications for maximum throughput.

Configure VisualVM on Ubuntu 14.10

VisualVM is a kind of data gathering software for application which are running under the Java Virtual Machines (JVM). This retrieve information related to the Java application, like heap size, heap dumps, RAM utilisation, CPU utilisation, thread count and so on. There is an special interface that they use for getting information from application ends and gathered information is analysed and displayed on the VisualVM dashboard. Remote application also can be monitored via VisualVM. Specially user can get snapshot of heat dumps also.

Follow the steps to install VisualVM on Ubuntu server.
# sudo apt-get install visualvm
# which viaualvm
# java -version

You can check the java is up & running up using the commands given above. And for testing purpose, I’m here using a Java testing application in the same host. Let’s open the visualVM and configure it to get the information of running applications. Continue reading

Tomcat Server Load-Balancing Using Multiple Tomcat Server Instances in Ubuntu

Hello, in here I’m going to describe how to configure load balancing among multiple Apache tomcat servers, before write this article I searched on web and found many solutions but nothing worked correctly, getting some errors. So then somehow I managed to set up tomcat server load balancing. So here are the steps that I followed to configure load balancing on tomcat servers.

Before configure multiple server load balancing, you have to install and configure multiple tomcat server instances correctly, that has been described on my previous blog post about “How to configure multiple tomcat server instances”
Continue reading

Configure A Upstart File In Ubuntu Server.

Hello Everyone today I’m going to show you how to create a simple upstart file in Ubuntu server for .jar file. So let’s look at the steps for achieve this.

  1. Login to the Ubuntu Machine and go to “/etc/init/” then create a file with your project name and the file extention should be .conf (In here let’s assume the project name is project-test)
    $ cd /etc/init/
    $ sudo vi project-test.conf

    Continue reading

Odoo 8 | Installing And Configuring in Ubuntu Server.

Hello All, Here, I’m going to show you how to install new version of “Odoo” ERP system on Ubuntu server. New version is “Odoo v8” , which contains more reliable features. Now it has been very easy to install and configure. Before installing the Odoo v8 let’s keep a clean installation on Ubuntu latest server version. The Ubuntu latest server version is Ubuntu Server 14.04. In here I have a clean Installation of Ubuntu Server 14.04. Continue reading