Many parameters are hard to notice, either because they occur at a low level or because they prevent your computer from booting when set wrong. It's through this screen that you can, for instance, rescue a machine with a lost password (unless you've also lost the password for an encrypted drive), force your device into airplane mode, deactivate the USB subsystem, redefine the boot drive, set the kernel version you want to boot, and change many other configuration options. There's rarely a reason to change them, and any changes you make from this screen disappear after you boot.
#Dcommand line edit boot order install#
These boot parameters are auto-generated when you install or update your Linux system. Press the e key on your keyboard to see exactly what parameters are being set. It's GRUB that controls how your operating system (OS) is about to boot. When you first encounter GRUB, it's before your operating system has booted. On most Linux systems, the first software that gets loaded is the Grand Unified Bootloader (GRUB), and it's interactive and customizable. At that point, it's all software, and software is easy to update and modify.
Once it finds a valid hard drive, the motherboard's firmware passes control of booting over to the hard drive. BIOS and UEFI provide an interface for setting preferences, but firmware is mostly permanent. Learning path: Deploy a cluster in Red Hat OpenShift Service on AWS (ROSA)įirmware is called firmware because it's not malleable, or at least not easily.
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