Grub2

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Autor Siim Soe

GRUB vs GRUB2

GRUB 2's default menu will look familiar to GRUB users but there are a great number of differences beneath the surface.

• On a new install of Ubuntu 9.10 with no other installed operating system, GRUB 2 will boot directly to the login prompt or Desktop. No menu will be displayed.
• Hold down SHIFT to display the menu during boot (formerly ESC in GRUB legacy).
• No /boot/grub/menu.lst. It has been replaced by /boot/grub/grub.cfg.
• There is no "/find boot/grub/stage1" at the grub prompt. Stage 1.5 has been eliminated.
• The main menu file, /boot/grub/grub.cfg, is not meant to be edited, even by 'root'.
• grub.cfg is overwritten anytime there is a update, a kernel is added/removed, or the user runs update-grub
• The user can use a custom file, /etc/grub.d/40_custom, in which the user can place his own entries. This file will not be overwritten.
• The primary configuration file for changing menu display settings is /etc/default/grub.
• There are multiple files for configuring the menu - /etc/default/grub mentioned above, and all the files in the /etc/grub.d/ folder.
• Partition numbering has changed. The first partition is now 1 rather than 0. The first device is still 0, however (no change).
• Automated searches for other operating systems, such as Windows, whenever update-grub is executed.
• No changes made in the configuration files will take effect until the update-grub command is also run.

Mis on uut?

GRUB2 ehk GRand Unified Bootloader on oluliselt erinev tavalisest GRUB'ist. Võrreldes vana versiooniga on lisatud järgnev funktsionaalsus

• Skriptimistugi mis toetab ka tinglikke lauseid (if-else) ja funktsioone
• Dünaamiline moodulite laadimine
• Päästmisrežiim
• Kohandatud menüüd
• Teemad
• Graafiline alglaadur
• LiveCD tõmmiste laadimine otse kõvakettalt
• Seadistusfailide uus struktuur
• Mitte-x86 platvormide tugi (nt PowerPC)
• Universaalne UUID tugi (mitte ainult Ubuntu)

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