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Linux GRUB and grub.conf troubleshooting - part2

Coming in contact for the first time with a server that fails to boot (from grub configuration errors) can be difficult, if you don't have a copy of the grub.conf at hand.

List available disks at grub prompt


List available disk partition at grub prompt


The above is the INcomplete grub find command. You can also use it to find a grub.conf on the available partitions on each disk.

An example of find command that will find a grub.conf file:


An example of find command that will NOT find a grub.conf file:


Once I know on which disk and partition the grub.conf file resides, I can cat it to have an idea of the GRUB boot configuration:


The above command works mostly as the Linux cat command and it will display the contents of the /boot/grub/grub.conf file on the fist partition from the first disk.

To manage to boot the system from GRUB command line, issue the root/kernel/initrd commands in this sequence, as in the grub.conf file in the stanza that interests you (usually, previous running kernel).