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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by Ramdev · Published September 1, 2015 · Last modified September 19, 2019
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...
Blog for Unix Admin / Linux Admin / Linux Booting
by Ramdev · Published June 18, 2011 · Last modified October 10, 2015
The function of a boot loader is to locate the Linux kernel, and load it into memory before starting it. Boot loading usually occurs in at least two stages – the BIOS loads the primary boot loader, which loads a secondary boot loader in order...
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...
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...
Linux Admin / Linux Booting / Solaris Booting / Unix Intermediate
by Ramdev · Published April 2, 2022
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...
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...
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...
Linux Admin / Linux Booting / Solaris Booting
by Ramdev · Published September 28, 2015 · Last modified October 10, 2015
1. Invoking grub2-install The program ‘grub2-install’ generates a GRUB core image using‘grub2-mkimage’ and installs it on your system. You must specify the device name on which you want to install GRUB, like this:
Linux Admin / Linux Booting / Linux Disk Management / Linux Troubleshooting
by Ramdev · Published April 29, 2022
This post will help you resolve the Linux file system issue that causing below errors.
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