The Geek Stuff

How To Install Apache Hadoop Pseudo Distributed Mode on a Single Node

Ramesh Natarajan — Wed, 08 Feb 2012 06:02:51 +0000

Apache Hadoop Pseudo-distributed mode installation helps you to simulate a multi node installation on a single node. Instead of installing hadoop on different servers, you can simulate it on a single server. Before you continue, make sure you understand the hadoop fundamentals, and have tested the standalone hadoop installation. If you’ve already completed the 1st [...]

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How to Prevent SQL Injection Attack (Explained with an Example)

Lakshmanan Ganapathy — Tue, 07 Feb 2012 06:02:39 +0000

This article explains basics of SQL Injection with an example that shows SQL Injection, and provides methods to prevent from these attacks. As the name suggests, this attack can be done with SQL queries. Many web developers are unaware of how an attacker can tamper with the SQL queries. SQL-Injection can be done on a web application [...]

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What is RTOS? – Real Time Operating Systems Basics

Himanshu Arora — Mon, 06 Feb 2012 06:02:09 +0000

Suppose a person is driving a car on a highway at a speed of 70 miles per hour. Now, somehow the car meets with an accident. Fortunately the airbag deployed at the right time and saved the life of the driver. So, we see that airbag is a very good feature in a car which [...]

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How to Install Oracle VM VirtualBox and Create a Virtual Machine

Lakshmanan Ganapathy — Fri, 03 Feb 2012 06:02:47 +0000

Oracle VM VirtualBox is an open source virtualization software that you can install on various x86 systems. You can install Oracle VM Virtualbox on top of Windows, Linux, Mac, or Solaris. Once you install the virtualbox, you can create virtual machines that can be used to run guest operating systems like Windows, Linux, Solaris, etc. [...]

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Apache Hadoop Single Node Standalone Installation Tutorial

Ramesh Natarajan — Wed, 01 Feb 2012 06:02:12 +0000

When you implement Apache Hadoop in production environment, you’ll need multiple server nodes. If you are just exploring the distributed computing, you might want to play around with Hadoop by installing it on a single node. This article explains how to setup and configure a single node standalone Hadoop environment. Please note that you can [...]

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5 Useful Perl 5.10 Features – Say, State, ~~, Defined OR

SathiyaMoorthy — Mon, 30 Jan 2012 06:02:27 +0000

Even though Perl 5.10 is an old release, there are few things that was introduced in Perl 5.10, which you might find it useful. In the future article of this series, we’ll be covering new features of Perl 5.14 These are the 5 new Perl 5.10 features that you might find helpful. 1. Say it [...]

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C Pointer to Pointer, Pointer to Functions, Array of Pointers Explained with Examples

Himanshu Arora — Fri, 27 Jan 2012 06:02:16 +0000

In C programming language, the concept of pointers is the most powerful concept that makes C stand apart from other programming languages. In the part-I of this series we discussed the fundamental concepts around C pointers. In this article, we will try to develop understanding of some of the relatively complex concepts. The following are [...]

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Linux Time Command Examples

Himanshu Arora — Thu, 26 Jan 2012 06:02:45 +0000

There are times when you might want to profile your program on parameters like: Time taken by program in user mode Time taken by program in kernel mode Average memory usage by the program etc On Linux we have a utility ‘time’ that is designed specifically for this purpose. The utility ‘time’ takes a program [...]

How to Setup Rsyslog Remote Logging on Linux (Central Log Server)

Lakshmanan Ganapathy — Wed, 25 Jan 2012 06:02:43 +0000

Every Linux distribution have some kind of logging mechanism that records all the system activities. A while back we provided a list of 20 log files that are stored under /var/log that you might be helpful during troubleshooting. These logs are very critical for sysadmin for troubleshooting purpose. The following are the three common methods to log [...]

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6 Nagios Command Line Options Explained with Examples

Ramesh Natarajan — Mon, 23 Jan 2012 06:02:13 +0000

This article explains various command line options that are available for the nagios command. 1. Start Nagios Daemon Using nagios -d Typically you would execute “service nagios start” to start the Nagios daemon, which really calls the /etc/rc.d/init.d/nagios script. You’ll see the following line inside the /etc/rc.d/init.d/nagios script for the Nagios startup: $NagiosBin -d $NagiosCfgFile [...]

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