Updated partial proc_booting-with-configfile-on-different-partition.adoc (#522)

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Anthony McGlone 2023-01-21 14:23:23 +00:00 committed by anthonymcglone
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= Booting the system using a configuration file on a different partition.
If you end up in *GRUB2* boot prompt, it is also possible to boot using a _configfile_ that's located on another
partition, as is often the case with multi-boot systems containing Ubuntu and Fedora. To boot the system using a configuration files on a different partition:
partition, as is often the case with multi-boot systems containing Ubuntu and Fedora. Follow the below procedure
if you need to boot from a configuration file on a different partition.
.Procedure
. Load necessary modules to read the partitions.
. Load the necessary modules to read your system's partitions (you will also need to load `part_msdos` or `part_gpt`, depending on your partition table).
+
* For BTRFS filesystems:
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----
insmod part_msdos
insmod xfs
insmod lvm
grub> insmod btrfs
----
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* For LVM filesystems:
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----
grub> insmod xfs
grub> insmod lvm
----
. Set the root partition.
. Set *GRUB2* root to your `/boot` partition. On UEFI systems, you should set *GRUB2* root to the EFI system partition.
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----
set root='hd0,msdos1'
grub> set root=(hd0,msdos1)
----
. Set the path to the configuration file.
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----
configfile /grub2/grub.cfg
grub> configfile /grub2/grub.cfg
----
.More information
* The *hd0,msdos1* line shows the pertinent _boot_ partition, which holds the `grub.cfg` file. The setting may be different on your system. See also xref:using-grub2-prompt[Using the GRUB2 boot prompt] for more information.
* The *hd0,msdos1* line shows the pertinent `/boot` partition, which holds the `grub.cfg` file. The setting may be different on your system. See also xref:using-grub2-prompt[Using the GRUB2 boot prompt] for more information.