Tips To Protect Linux Servers Physical Console Access

Posted on in Categories Debian Linux, Hardware, Howto, Kde, Linux, Linux desktop, Linux distribution, package management, RedHat/Fedora Linux, Sys admin, Tips, Ubuntu Linux last updated March 12, 2009

This is an user contributed article.

Linux computer console is a physical device to operate a computer / server. Here are few steps which, if taken, make it more difficult for an attacker to quickly modify a system from its console.

Linux: Boot a 2TB+ partition or Larger Array Using Grub

Posted on in Categories CentOS, data center, fedora linux, File system, Gentoo Linux, Hardware, High performance computing, Howto, kernel, Linux, Linux Scalability, Linux Virtualization, RedHat/Fedora Linux, Storage, Tips, vmware, xen last updated December 4, 2008

I’ve already written about creating a partition size larger than 2TB under Linux using GNU parted command with GPT. In this tutorial, I will provide instructions for booting to a flat 2TB or larger RAID array under Linux using the GRUB boot loader.

How to edit GRUB Settings with GUI tool QGRUBEditor

Posted on in Categories Download of the day, GNU/Open source, Howto, Linux, Linux desktop last updated December 28, 2007

There is a tiny little program called QGRUBEditor. It is a system GUI tool to view and edit the GRUB boot loader. It offers many features and it is the perfect solution for those who want to change the way GRUB works, without messing with GRUB’s configuration files. This is an excellent tool for a new user.

From the article:

If you’ve been running Linux long enough to have upgraded your system more than once, you probably have several Linux kernels lurking around your system. If you discover that a certain application no longer works for you, you can go back to a previous kernel to try to run your program. GRUB, the boot loader found in most Linux distributions, lets you choose among operating systems and kernels installed on your box. Many people, however, fear that messing with GRUB may ruin their system, because of its many esoteric options, and configuration file text that often contains no help comments. QGRUBEditor can help you view and edit the GRUB boot loader from a graphical user interface.

QGRUBEditor - A visual GUI GRUB configuration editor
(Fig 01: QGRUBEditor in action [image credit official project home page] )

Download QGRUBEditor ~ A visual GUI GRUB configuration editor

Visit official project page to download QGRUBEditor (Found via Linux.com )

GNU Grub: A Beginners Guide And HowTo Collection

Posted on in Categories CentOS, Debian Linux, GNU/Open source, Howto, Links, Linux, Sys admin, Tips last updated September 15, 2007

GNU Grub allows you to have several operating system on system and user can select one to start. Grub allows you to boot different kernels, operating system, floppy / cd boot and network boot. Dedoimedo.com has published article about how to setup and configure GRUB bootloader with multiple operating systems. This article is a compilation of sources and examples that will help you learn about GRUB. New Linux users will probably find the notion of spending hours searching for relevant pieces of information (especially if their PC won’t boot) somewhat frustrating. The goal of this guide is to help provide simple and quick solutions to most common problems regarding multi-boot setups and installation of Linux operating systems:

nixCraft FAQ Roundup April 27, 2007

Posted on in Categories FAQ last updated April 27, 2007

Recently updated/posted Linux and UNIX FAQ (mostly useful to Linux/UNIX new administrators or users) :

Enjoy!

HowTo: Recovering Linux Grub Boot Loader Password

Posted on in Categories CentOS, Debian Linux, Howto, Linux, RedHat/Fedora Linux, Suse Linux, Sys admin, Tips, Troubleshooting, Ubuntu Linux last updated February 20, 2006

If you have, a password protected grub boot loader and you forgot both root and grub password, then you can recover grub-boot loader password using the following method/procedure:

* Use Knoppix cd
* Remove the password from Grub configuration file
* Reboot the system
* Change the root password
* Setup new Grub password if required (optional)

Linux: Recovering Deleted /etc/shadow Password File

Posted on in Categories Data recovery, Howto, Linux, Sys admin, Tips, Troubleshooting last updated December 21, 2005

You may delete a file called /etc/shadow. If you try to boot into a single user mode, system will ask for the maintenance root password. Now imagine this, you do not have a backup of /etc/shadow file. How do you fix such problem in a production environment where time is a critical factor? I will explain how to recover a deleted /etc/shadow file in five easy steps.