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Linux GRUB and grub.conf troubleshooting - part1 https://forum.ivorde.com/linux-grub-and-grub-conf-troubleshooting-part1-t45.html |
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Author: | debuser [ Mon Jan 04, 2010 10:37 am ] |
Post subject: | Linux GRUB and grub.conf troubleshooting - part1 |
Troubleshooting GRUB requires knowing how grub works. Looking at a sample grub.conf file, we can see the commands that grub will accept at command line prompt. Code: node1# cat /boot/grub/grub.conf # grub.conf generated by anaconda # # Note that you do not have to rerun grub after making changes to this file # NOTICE: You do not have a /boot partition. This means that # all kernel and initrd paths are relative to /, eg. # root (hd0,0) # kernel /boot/vmlinuz-version ro root=/dev/sda1 # initrd /boot/initrd-version.img #boot=/dev/sda default=1 timeout=5 serial --unit=0 --speed=9600 terminal --timeout=5 serial console title Memtest86+ (1.26) root (hd0,0) kernel /boot/memtest86+-1.26 ro root=LABEL=/ idle=poll console=ttyS1,115200 title Red Hat Enterprise Linux AS (2.6.9-42.ELsmp) root (hd0,0) kernel /boot/vmlinuz-2.6.9-42.ELsmp ro root=LABEL=/ console=tty0 console=ttyS0,9600n8 initrd /boot/initrd-2.6.9-42.ELsmp.img One thing to know about grub is that it's configuration file (grub.conf) reside in the /boot directory. In some cases /boot is a directory on the root filesystem, or a filesystem of it's own. From grub's point of view, there is a difference. If /boot is a directory on the root filesystem (like above), then all paths in grub.conf will be relative to /. If /boot is a standalone filesystem, then all paths will be relative to /boot (instead of /boot/vmlinuz-2.6.9-42.ELsmp, it will be /vmlinuz-2.6.9-42.ELsmp). For each stanza, there is the root command which defines where is the /boot directory for that specific Linux OS(disk & partition). After that, the kernel and initrd define where are the kernel image and the initial ram disk + other parameters, relative paths from /boot directory/filesystem. |
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