Linux grub: Difference between revisions
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[[ | [[Category:Linux|Grub]] | ||
[[ | [[Category:Grub|Linux]] | ||
=grub rescue>= | =grub rescue>= | ||
The problem: | The problem: | ||
< | <syntaxhighlight lang=bash> | ||
... | ... | ||
Entering rescue mode... | Entering rescue mode... | ||
grub rescue> | grub rescue> | ||
</ | </syntaxhighlight> | ||
| Line 13: | Line 13: | ||
Find your devices: | Find your devices: | ||
< | <syntaxhighlight lang=bash> | ||
grub rescue> ls | grub rescue> ls | ||
</ | </syntaxhighlight> | ||
===Find the directory where the normal.mod file resides=== | ===Find the directory where the normal.mod file resides=== | ||
In this example we have LVM and the /boot/grub is in VG vg-root and the LV lv-root. | In this example we have LVM and the /boot/grub is in VG vg-root and the LV lv-root. | ||
< | <syntaxhighlight lang=bash> | ||
grub rescue> ls (lvm/vg--root-lv--root)/boot/grub/i386-pc | grub rescue> ls (lvm/vg--root-lv--root)/boot/grub/i386-pc | ||
... normal.mod ... | ... normal.mod ... | ||
</ | </syntaxhighlight> | ||
===Set the prefix to the right place=== | ===Set the prefix to the right place=== | ||
< | <syntaxhighlight lang=bash> | ||
grub rescue> set prefix=(lvm/vg--root-lv--root)/boot/grub | grub rescue> set prefix=(lvm/vg--root-lv--root)/boot/grub | ||
</ | </syntaxhighlight> | ||
===Now you can load and start the module called "normal"=== | ===Now you can load and start the module called "normal"=== | ||
< | <syntaxhighlight lang=bash> | ||
grub rescue> insmod normal | grub rescue> insmod normal | ||
grub rescue> normal | grub rescue> normal | ||
</ | </syntaxhighlight> | ||
If the menu not occurs you get something like this: | If the menu not occurs you get something like this: | ||
< | <syntaxhighlight lang=bash> | ||
GNU GRUB version 1.99,5.11.0.175.2.0.0.42.2 | GNU GRUB version 1.99,5.11.0.175.2.0.0.42.2 | ||
| Line 44: | Line 44: | ||
grub> | grub> | ||
</ | </syntaxhighlight> | ||
==Normal grub is bootet, now start the Kernel== | ==Normal grub is bootet, now start the Kernel== | ||
Example for LVM: | Example for LVM: | ||
< | <syntaxhighlight lang=bash> | ||
insmod gzio | insmod gzio | ||
insmod part_msdos | insmod part_msdos | ||
| Line 56: | Line 56: | ||
linux /boot/vmlinuz-4.4.0-53-generic root=/dev/mapper/vg--root-lv--root ro | linux /boot/vmlinuz-4.4.0-53-generic root=/dev/mapper/vg--root-lv--root ro | ||
initrd /boot/initrd.img-4.4.0-53-generic | initrd /boot/initrd.img-4.4.0-53-generic | ||
</ | </syntaxhighlight> | ||
Example for ZFS-Root: | Example for ZFS-Root: | ||
< | <syntaxhighlight lang=bash> | ||
insmod gzio | insmod gzio | ||
insmod part_msdos | insmod part_msdos | ||
| Line 66: | Line 66: | ||
linux /ROOT/ubuntu-15.04@/boot/vmlinuz-4.4.0-57-generic root=ZFS=rpool/ROOT/ubuntu-15.04 boot=zfs zfs_force=1 ro quiet splash nomdmonddf nomdmonisw $vt_handoff | linux /ROOT/ubuntu-15.04@/boot/vmlinuz-4.4.0-57-generic root=ZFS=rpool/ROOT/ubuntu-15.04 boot=zfs zfs_force=1 ro quiet splash nomdmonddf nomdmonisw $vt_handoff | ||
initrd /ROOT/ubuntu-15.04@/boot/initrd.img-4.4.0-57-generic | initrd /ROOT/ubuntu-15.04@/boot/initrd.img-4.4.0-57-generic | ||
</ | </syntaxhighlight> | ||
Latest revision as of 17:51, 25 November 2021
grub rescue>
The problem:
...
Entering rescue mode...
grub rescue>
Get into the normal grub
Find your devices:
grub rescue> ls
Find the directory where the normal.mod file resides
In this example we have LVM and the /boot/grub is in VG vg-root and the LV lv-root.
grub rescue> ls (lvm/vg--root-lv--root)/boot/grub/i386-pc
... normal.mod ...
Set the prefix to the right place
grub rescue> set prefix=(lvm/vg--root-lv--root)/boot/grub
Now you can load and start the module called "normal"
grub rescue> insmod normal
grub rescue> normal
If the menu not occurs you get something like this:
GNU GRUB version 1.99,5.11.0.175.2.0.0.42.2
Minimal BASH-like line editing is supported. For the first word, TAB
lists possible command completions. Anywhere else TAB lists possible
device or file completions.
grub>
Normal grub is bootet, now start the Kernel
Example for LVM:
insmod gzio
insmod part_msdos
insmod lvm
insmod ext2
set root='lvmid/KAlPF4-Qb8I-Sx41-10cC-lACw-Msoh-3qEohv/pmE9Nt-rLG3-FlNM-CwOT-hy42-gSnm-fZSn3l'
linux /boot/vmlinuz-4.4.0-53-generic root=/dev/mapper/vg--root-lv--root ro
initrd /boot/initrd.img-4.4.0-53-generic
Example for ZFS-Root:
insmod gzio
insmod part_msdos
insmod zfs
set root='hd0,msdos4'
linux /ROOT/ubuntu-15.04@/boot/vmlinuz-4.4.0-57-generic root=ZFS=rpool/ROOT/ubuntu-15.04 boot=zfs zfs_force=1 ro quiet splash nomdmonddf nomdmonisw $vt_handoff
initrd /ROOT/ubuntu-15.04@/boot/initrd.img-4.4.0-57-generic
