Installations Soon after downloading the Java EE on Ubuntu machine through the website the file (~48 MB) called java_ee_sdk-6-web-unix.sh. An attempt to run the shell script resulted in the following error. Could not locate a suitable Java runtime. Please ensure that you have Java 6 or newer installed on your system and accessible in your PATH or by setting JAVA_HOME This requires installation of Java 6 by using the following command (another roughly 55 MB). $ sudo apt-get install sun-java6-jdk Now going back to the Java EE installation through the following command. $ sh java_ee_sdk-6-web-unix.sh Going through the clicks (one has to only write the password for admin account and the proxy if any). Rest of the information is filled in by default. Verifying Installation Now go to the web browser and type the following in the address box. http://localhost:4848 If you changed the value of admin control panel port. Please replace 4848 with the port number you specified during in...

Virtualization dates back to the introduction of CP/CMS later renamed IBM VM-370. VM-370 provided two key ingredients. Multiprogramming and extended machine with better interface with the hardware[1]. The recent interest in Virtualization came on the back drop of energy conservation and providing services to users. The explosive growth of the needs of internet and data centers has fueled this renewed interest in Virtualization. Virtualization Software Already have experimented with a virtual machine player VMware Player marketed by VMware Inc. Using this we installed FreeBSD, Ubuntu, Gentoo on top of Windows XP. Whats the next step towards Virtualization? Hypervisor? Hypervisors are of two basic types. Type one are those which provide direct interface between the Guest OS and the hardware. While the type two hypervisor has a host OS onto which the virtualization software is installed and then the guest OS is installed. VMware ESX and GSX are examples of type 1 and type 2 hypervis...

PLEASE NOTE THAT IF YOU ARE USING DIRECT CONNECTION TO THE INTERNET THEN THE FOLLOWING POST DOES NOT APPLY. TRYING TO SET THE SETTINGS MAY LEAD TO DISRUPTIONS / DISCONNECTION FROM THE INTERNET. How and where should I change proxy settings in Linux? This is a most frequent question posed by newbie (and not so new) Linux users ? This mountain can be scaled in three steps. Step 1 Using proxy to get simply connected to the internet Just change proxy setting in Firefox and/ or browser of your choice and start using internet. Ignore the rest of urges of Linux to get updates etc and life will be cool and simple. Of course life cannot continue to be so simple. One has to after all install programs etc. Step 2 Adding proxy for system-wide settings Now the next step is to setup proxy for "system-wide" setting. If using GNOME got to the System-> Preferences -> Network Proxy. Typical settings could be ip address/ host name of the proxy server and port name (t...

In the early nineties Linux was a hobby, which in the words of Linus Torvalds might never be professional like GNU. It took off and shook the foundations of empires aspiring to bleed every penny by selling server operating system. The contributions of open source community have caused severe headache for software companies. Apache Foundation is one such name. How much does it cost to setup a web server? Around the cost of a LAMP, compare this with the cost of aptly named vamp or is it WAMP?  What jinn did the lamp raise? What changes did it trigger? A very simple question is how come Ethernet and Networks were around in the seventies but it took just a couple of years after Linux for Internet to raise it head? The answers to all these questions is there was no LAMP earlier. LAMP stands for Linux Apache MySQL PHP (Python / Perl).  This is open source combination which gives a head start to web development environment. LAMPs have been around for not very long but the LAMP was...