HOWTO_Quick_GRUB
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Contents |
Step 1: Install GRUB
Install grub:
# emerge -n grub
In this case, or to prevent it from possibly happening, remove the CFLAGS for the emerge.
# CFLAGS="" emerge grub
Step 2: The GRUB Prompt
A user may decided to use grub-install or they can set up grub manually.
After it finishes installing then run the GRUB prompt:
# grub
Once you're in the prompt type the following in order:
root (hdx,y) setup (hdx) quit
Of course don't actually put in (hdx,y). Replace x with the hard drive type and location.
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hda is the common device for an IDE disk, a subsequent drive will be hdb, or sda if you have no IDE hard disk. ID numbering starts at 0 for the "first" hard-disk.
The mapping of device against grub number is listed in /boot/grub/device.map, so /dev/sda1 can very well end up in (hd2,0).
You can use grubs auto-complete feature to discover what partitions/drives it sees. When you type in the root command, hit the tab key twice
root (hd<TAB><TAB>
If the drive does not show up in the map file and you deal with dynamically attached devices such as USB memory, do the following: delete /boot/grub/device.map and invoke grub like this grub --device-map=/boot/grub/device.map. This will re-generate the map file considering all dynamic drives.
Step 3: The GRUB Configuration File
After this you need to edit the grub.conf file which is located in /boot/grub and you can get to it by using your favorite editor.
nano /boot/grub/grub.conf
If this comes up blank, your boot partion is probably not mounted. Try:
mount /dev/hda1 /boot nano /boot/grub/grub.conf
note: You must be root to edit this file (obviously).
This is a sample configuration:
| File: /boot/grub/grub.conf |
timeout 30 default 0 fallback 1 splashimage=/boot/grub/splash.xpm.gz title Gentoo Linux kernel (hd0,0)/boot/vmlinuz-2.6.10-gentoo-r1 root=/dev/hda2 title Windows rootnoverify (hd1,0) chainloader +1 |
Gentoo also permits run level to be set using text names, not the standard numbers (although the names to map to numbers). To do this, use the softlevel variable. e.g. to boot to runlevel user;
title Gentoo Linux kernel (hd0,0)/boot/vmlinuz-2.6.10-gentoo-r1 root=/dev/hda2 softlevel=user
To see the services that will be started for each level, enter;
# rc-update show
at the console.
See Also
- Configuring the Bootloader from Gentoo Handbook
External links
- GRUB Manual
- GRUB homepage
- Grub wiki
- Linux+Win+Grub HowTo
- Linux Recovery and Boot Disk Creation with Grub.
- Win32 Grub
- Booting with GRUB
- WinGRUB
- GRUB Installer for Windows
- GRUB for DOS - Bridging DOS/Windows to Unix/Linux
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