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Fastest Way to Gain Root Access in RHCSA7 Exam

This blog post describes the fastest way that I know to change the root password on a RHEL7 platform if you do not know or have forgotten the root password. A typical use case is the RHCSA 7 exam.

Accessing Cisco Secure ACS 5.X Internals

Cisco Secure Access Control System is based on CentOS. This post will show you how to access the Bash shell as root, and explores the underlying filesystem layout and utilities which make up this product..

Using FedUp to Update an EFI Boot Stub System to Fedora 19

FedUp (FEDora UPgrader) is the new tool for upgrading existing Fedora installs in Fedora 18 and above releases. It replaces all the previously recommended upgrade methods, i.e. PreUpgrade, DVD, USB, etc., that were available in previous Fedora releases. By the way, the Anaconda installer was totally redesigned for Fedora 18 and no longer has built-in upgrade functionality in Fedora 18 or later releases. Such functionality was delegated to FedUp. In this post, I demonstrate how to use FedUp to upgrade an EFI Boot Stub (EFISTUB) Fedora 18 system to an EFI Boot Stub Fedora 19 system. The EFI Boot Stub

UEFI Memory V E820 Memory

In this post I discuss the differences between how UEFI hands off memory to the Linux Kernel and how old-fashioned BIOSes handled off memory via E820.

Fedora 16 GPT, GRUB2 and BIOS Boot Partition

This post discusses the requirement for a GPT BIOS Boot Partition by GRUB2 in order to boot a BIOS-based system.