Category: Linux Booting

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Working with dracut in RHEL7

Introduction dracut – low-level tool for generating an initramfs image Create an initramfs for the kernel with the version . If is omitted, then the version of the actual running kernel is used. If is omitted or empty, then the default location /boot/initramfs-.img is used.

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Mastering Grub – Part 5 – Grub Security

Grub Security Authentication and authorization in GRUB By default, the boot loader interface is accessible to anyone with physical access to the console: anyone can select and edit any menu entry, and anyone can get direct access to a GRUB shell prompt.  For most systems, this...

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Mastering GrUB – Part 4 – Grub Configuration Syntax and Commands

1. Grub Configuration syntax and semantics GRUB uses a special syntax for specifying disk drives which can be accessed by BIOS. Because of BIOS limitations, GRUB cannot distinguish between IDE, ESDI, SCSI, or others. You must know yourself which BIOS device is equivalent to which OS...

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Mastering GrUB – Part 3 – Grub Booting and Images

Booting GRUB from the network The following instructions don’t work for *-emu, i386-qemu,i386-coreboot, i386-multiboot,mips_loongson, mips-arc and mips_qemu_mips to generate a netbootable directory, run:       grub2-mknetdir –net-directory=/srv/tftp –subdir=/boot/grub -d /usr/lib/grub/<platform> E.g.  for i386-pc:     grub2-mknetdir –net-directory=/srv/tftp –subdir=/boot/grub -d /usr/lib/grub/i386-pc Then follow instructions printed out by grub2-mknetdir on...

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Mastering Grub – Part 2 – Grub Configurations

1. Grub Configurations GRUB is configured using ‘grub.cfg’, usually located under ‘/boot/grub’. This file is quite flexible, but most users will not need to write the whole thing by hand. 1.1  Simple configuration handling The program ‘grub2-mkconfig’ generates ‘grub.cfg’ upgrading a distribution, and will discover available...

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Mastering Grub – Part 1 – Introduction and Overview of Grub Boot Loader

1. Introduction to Grub Briefly, a “boot loader” is the first software program that runs when a computer starts. It is responsible for loading and transferring control to an operating system “kernel” software (such as Linux or GNU Mach). The kernel, in turn, initializes the rest...

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Linux Administration Information Center

Booting Tasks Read – Unexpected Server Reboots of RHEL servers on HP Read – Linux Admin Reference – RedHat Linux Grub Loader Storage Responsibilities Read – Understand Device Mapper and DM-Multipath Read – Identifying Disk Errors in Linux Read – Identify if linux was installed on...

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Linux Admin Reference – RedHat Linux Grub Loader

1. How to re-install GRUB bootloader on the Master Boot Record(MBR) in rescue mode? The most common reason to reinstall GRUB is  a disk failure and an accidental overwrite on MBR . In addition, there is also a hardware-specific reason that a SATA controller is not running in the...

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