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Saturday, 31 December 2011

Creating Swap space in Linux / RHEL / CENTOS / Fedora

Creating Swap space

As mentioned before, a swap space can be a partition or a file with pre-allocated space.

Friday, 30 December 2011

Swap Space in Linux / RHEL / CENTOS / Fedora

What is a Swap space?
  • Swap space is harddisk space that extends system RAM.
Swap space or virtual memory is hard disk space that acts as an extension of system RAM. Of course, due to the relative differential in data access on RAM versus hard disk, we prefer not to use swap space if it can be avoided. Nonetheless, it is vital to the proper functioning of a typical Linux system that some swap space  be made available.

Thursday, 29 December 2011

Password protect GRUB / Lock Single User Mode In Linux / RHEL / CENTOS

The primary reasons for password protecting a Linux boot loader are as follows:
  1. Preventing Access to Single User Mode — If attackers can boot the system into single user mode, they are logged in automatically as root without being prompted for the root password.

Wednesday, 28 December 2011

Rescue Linux Installation in RHEL / CENTOS / Fedora

Rescuing a Linux system is an easier task. There are several aspects of rescuing a Linux system.
Here we are going to see how to rescue an installed Linux system when the GRUB is deleted.

Tuesday, 27 December 2011

Enter Single user mode in Linux / RHEL / CENTOS / Fedora

If you are using GRUB bootloader
  • Select the particular kernel to boot in (use up and down arrows in the GRUB splash screen)
  • Now you will find an option "press a to append..". So press the key "a".
  • Now press the space key to add at the bottom of that line.
  • Append the word the "s" or "single" to the end of the kernel line.
  • Press Enter

Change / Hack the Root password in Linux / RHEL / CENTOS / Fedora

Forgot root password

Suppose you want to get into a Linux system. You know nothing about the existing user's or their passwords. You have no idea about these things. Then what will you do??
The only thing you know that the user root exists. So we must find a way to get the root's password.

Thursday, 22 December 2011

NTFS support in Linux (RHEL / CENTOS)

NTFS file system is not supported in RHEL 5 or 6. How do you I enable NTFS support?

To enable NTFS support we need to do a couple of things.

First of all enable the EPEL repo. Click here to learn How to enable the EPEL repo.
Then install the package "ntfs-3g" using yum.

Enabling EPEL repo in RHEL / CENTOS

EPEL - Extra Packages for Enterprise Linux.

What is Extra Packages for Enterprise Linux (or EPEL)?
Extra Packages for Enterprise Linux (or EPEL) is a Fedora Special Interest Group that creates, maintains, and manages a high quality set of additional packages for Enterprise Linux, including, but not limited to, Red Hat Enterprise Linux (RHEL), CentOS and Scientific Linux (SL).
EPEL packages are usually based on their Fedora counterparts and will never conflict with or replace packages in the base Enterprise Linux distributions. EPEL uses much of the same infrastructure as Fedora, including buildsystem, bugzilla instance, updates manager, mirror manager and more.

Monday, 19 December 2011

Install Windows 7 from USB drive using DISKPART

Windows 7 can be installed from a USB drive when the other installation methods are unavailable. We can choose between a memory card, hard drive which is USB compatible etc., and also several 3rd party tools are available for creating a USB bootable Windows 7 installation media, but I am using the "diskpart" command-line tool. Diskpart is a very good tool as it comes along with your install of Windows Vista, 7 and Server 2008.


The RHCSA (RedHat Certified System Administrator) exam is a hands-on, practical exam that lasts 2.5 hours. The exam is performance-based, meaning that candidates must perform tasks on a live system, rather than answering multiple choice questions.


The RHCE (RedHat Certified Engineer) exam is a hands-on, practical exam that lasts 2.0 hours. Candidates are eligible to take the RHCE exam without first having passed the RHCSA exam, but RHCE will not be issued until both credentials are earned by a candidate.

Friday, 14 October 2011

Authentication / Password Protection in Apache

There are many ways you can password protect directories under Apache web server. This is important to keep your file privates from both unauthorized users and search engines (when you do not want to get your data indexed). Here you will see the basics of password protecting a directory on your server. You can use any one of the following method:

Securing Apache Web Server with Encryption

In this blog we are going to discuss about encrypting communications to web server  using TLS/SSL.

Step 1:  Install mod_ssl and httpd

# yum -y install mod_ssl httpd

Thursday, 13 October 2011

Basic web server configuration in RHEL / CENTOS

Packages required – httpd
Daemon - /usr/sbin/httpd
Script -     /etc/init.d/httpd
Ports -       80/tcp (http) , 443/tcp (https)
Configuration - /etc/httpd/*

Wednesday, 5 October 2011

DNS / BIND Server Configuration in RHEL 6 / CENTOS 6

What is DNS?
DNS is called as Domain name system. DNS is name resolution service which resolves human friendly name (such as Example Web Page) into IP  address ( DNS is a hirarchical distributed database that contains
resolving of domain name into IP address.

Why DNS?
Because people and applications try to connect the network computer by  specifying name. DNS has superior scalability,security and compatibility with internet.

Tuesday, 4 October 2011

Install Vuze on Linux

Vuze (previously Azureus) is a BitTorrent client used to transfer files via the BitTorrent protocol. Vuze is written in Java, and uses the Azureus Engine. In addition to downloading data linked to by .torrent files, Azureus allows users to view, publish and share original DVD and HD quality video content. Content is presented through channels and categories containing TV shows, music videos, movies, video games and others. Additionally, if users prefer to publish their original content, they may earn money from it. Azureus was first released in June 2003 at, mostly to experiment with the Standard Widget Toolkit from Eclipse. It later became one of the most popular BitTorrent clients.
The Azureus software was released under the GNU General Public License, and remains as a free software application.

Friday, 29 July 2011

Install JDownloader in RHEL / CentOS 5

JDownloader is open source, platform independent, and written completely in Java. It simplifies downloading files from One-Click-Hosters like or - not only for users with a premium account but also for users who don't pay. It offers downloading in multiple parallel streams, captcha recognition, automated file extraction, and much more. Of course, JDownloader is absolutely free of charge. Additionally, many "link encryption" sites are supported - so you just paste the "encrypted" links and JD does the rest. JDownloader can import CCF, RSDF and the new DLC files. 

Thursday, 28 July 2011

Install Firefox 5 on CentOS 6

By default CentOS 6 comes with firefox 3.6.
Here's how to Install Firefox 5 on CentOS 6:

1. Log on as root.
2. Download firefox-5.0.1.tar.bz2 or later from to Downloads folder.
3. Also download an appropriate version of, in this case the version from Fedora 13 i686 will work:

Saturday, 23 July 2011

Install VLC Media Player on Fedora 15

VLC media player is a free and open source media player and multimedia framework written by the VideoLAN project.
VLC is a portable multimedia player, encoder, and streamer supporting many audio and video codecs and file formats as well as DVDs, VCDs, and various streaming protocols. It is able to stream over networks and to transcode multimedia files and save them into various formats.

Friday, 22 July 2011

Install Adobe (Acrobat PDF) Reader on Fedora 15/14, CentOS/ Redhat (RHEL) 5.6/6

 Adobe Acrobat is a family of application software developed by Adobe Systems to view, create, manipulate, print and manage files in Portable Document Format (PDF). All members of the family, except Adobe Reader (formerly Acrobat Reader), are commercial software; Adobe Reader however, is available as freeware and can be downloaded from Adobe's web site. Adobe Reader enables users to view and print PDF files but has negligible PDF creation capabilities.

Install Google Chrome on CentOS5 & RHEL5

Google Chrome is a web browser developed by Google that uses the WebKit layout engine. It was first released as a beta version for Microsoft Windows on September 2, 2008, and the public stable release was on December 11, 2008. In September 2008, Google released a large portion of Chrome's source code, including its V8 JavaScript engine, as an open source project entitled Chromium. This move enabled third-party developers to study the underlying source code and to help port the browser to the Mac OS X and Linux operating systems.Chromium implements a similar feature set as Chrome, but lacks built-in automatic updates, built-in PDF reader and Google branding, and most noticeably has a blue-colored logo in place of the multicolored Google logo.

Install Firefox 5 or 4 in RHEL, CentOS, Fedora

Mozilla Firefox is a free and open source web browser descended from the Mozilla Application Suite and managed by Mozilla Corporation. As of March 2011, Firefox is the second most widely used browser, with approximately 30% of worldwide usage share of web browsers.
The latest Firefox features include tabbed browsing, spell checking, incremental find, live bookmarking, a download manager, private browsing, location-aware browsing (also known as "geolocation") based exclusively on a Google service and an integrated search system that uses Google by default in most localizations. Functions can be added through extensions, created by third-party developers of which there is a wide selection, a feature that has attracted many of Firefox's users.
Firefox runs on various operating systems including Microsoft Windows, GNU/Linux, Mac OS X, FreeBSD, and many other platforms. Its current stable release is version 5.0, released on June 21, 2011. Firefox's source code is tri-licensed under the GNU GPL, GNU LGPL, or Mozilla Public License.
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