Useful Tutorials on Linux and UNIX for Beginners and Experts Alike

Looking for high-quality Linux and UNIX tutorials? This article tells you where to find more than 30 must-see Linux and UNIX tutorials online.

Linux

Linux and UNIX Training for Beginners

Free Linux Tutorials for Beginners

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Tips To Protect Linux Servers Physical Console Access

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.

Set BIOS Password

The BIOS is boot firmware, designed to be the first code run by a PC when powered on. It controls many important system parameters, including which devices the system will try to boot from, and in which order. Assign a password to prevent any unauthorized changes to the BIOS configuration. Reboot the server. Press special key like F2 (this key may vary from system to system). Go to BIOS configuration menu to add a password. Save and close the bios by pressing F10 (again key may vary)

Set GRUB Boot Loader Password Continue reading

Cloning and Copying VirtualBox virtual machines

This article explains how to clone and copy VirtualBox VMs (virtual machines).

The techniques described in this article were tested on a Windows XP Pro SP2 host operating system using VirtualBox version 2.0.4. The details may vary if you use a Linux or some other host OS.


Introduction

Cloning and copying VirtualBox VMs is not as straight forward or obvious as it is with VMWare Desktop and this subject has created a lot of confusion in the support forums. This is because:

  • There is no single VirtualBox command for VM cloning.
  • The documentation is vague.
  • A couple of the VirtualBox commands are poorly named.

The good news is that the underlying technology is just great and with a little understanding copying and cloning VMs is quite easy.

This article explains how to copy an existing VM containing an installed and configured guest OS. Before starting it helps to have a basic understanding of VirtualBox virtual machines. Continue reading