All IT projects needs a bug tracking (or issue tracking, or defect tracking) system. Sure, we need a bug tracking system for a software development project. But, what about a sysadmin team, dba team, network team? They all need some help to track their work, and issues of their system, database and network. I’ve listed [...] Read More: Top 10 Open Source Bug Tracking System

tcpdump command is also called as packet analyzer. tcpdump command will work on most flavors of unix operating system. tcpdump allows us to save the packets that are captured, so that we can use it for future analysis. The saved file can be viewed by the same tcpdump command. We can also use open source [...] Read More: Packet Analyzer: 15 TCPDUMP Command Examples

Question: How do I lookup the wwn address of my HBA card installed on the Linux system. I need this information to create zoning on my fiber channel switch.
Answer: Use one of the following methods to view the HBA WWN address on Linux.

Method 1: /sys/class/scsi_host/host{n}/device/fc_host:host{n}/port_name File
On Redhat 5 and above (including OEL and CentOS), the [...] Read More: HBA WWN: How to Find Qlogic or Emulex HBA Card WWN Address on Linux

When you install any software from source, you typically execute commands like — “make”, “make install”, “make clean”, etc. Have you wondered what all these make commands are really making? Sure, we know that it is trying to compile and install the software. But, why make? What does it really do?
For compiling a single C [...] Read More: Can You Make It? Compile C Programs on Linux Using Make Command

If you are a system administrator, or IT manager, or someone who is responsible for IT infrastructure, you should implement an enterprise level monitoring solution.
The shell script you’ve written that does a ps -ef and sends you an email might do the basic job, but it doesn’t count as monitoring.
If you want to be proactive, [...] Read More: 10 Things Any Monitoring Software Should Do (Nagios Does it)

IPC stands for Inter-process Communication.
This technique allows the processes to communicate with each another.
Since each process has its own address space and unique user space, how does the process communicate each other?
The answer is Kernel, the heart of the Linux operating system that has access to the whole memory. So we can request the kernel [...] Read More: 10 IPCS Command Examples (With IPC Introduction)

RAID stands for Redundant Array of Inexpensive (Independent) Disks.
On most situations you will be using one of the following four levels of RAIDs.

RAID 0
RAID 1
RAID 5
RAID 10 (also known as RAID 1+0)

This article explains the main difference between these raid levels along with an easy to understand diagram.

In all the diagrams mentioned below:

A, B, C, [...] Read More: RAID 0, RAID 1, RAID 5, RAID 10 Explained with Diagrams

Snort is a free lightweight network intrusion detection system for both UNIX and Windows.
In this article, let us review how to install snort from source, write rules, and perform basic testing.

1. Download and Extract Snort
Download the latest snort free version from snort website. Extract the snort source code to the /usr/src directory as shown [...] Read More: Snort: 5 Steps to Install and Configure Snort on Linux

As part of our on-going VMware series of articles, we earlier discussed about how to install VMware ESXi server, and  how to install vSphere Client.
In this article, let us see how to create a new datastore using vSphere client.

1. View Existing ESXi VMware Datastores
Launch vSphere Client -> Click on the top node in the left [...] Read More: VMware ESXi 4: How to Add VMFS Datastore Using vSphere Client ( with Screenshots )

Question: Can you provide me a shell script that will accept oracle credentials, sql query to be executed and displays the output?
Answer: The shell script given below prompts some basic information and displays the output of the SQL.
You can use the same concept and hard-code some of these values in the shell-script itself and even [...] Read More: Unix Shell Script to Execute Oracle SQL Query