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Add documentation section about GRUB chain loading

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Reviewed-by: Aleix Boné <abonerib@bsc.es>
This commit is contained in:
Rodrigo Arias 2024-06-07 10:40:37 +02:00
parent e15a3867d4
commit dd6d8c9735
1 changed files with 16 additions and 2 deletions
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doc/install.md
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@ -151,12 +151,26 @@ And update grub.
# nix build .#nixosConfigurations.xeon02.config.system.build.kexecTree -v
```
## Chain NixOS in same disk
## Chain NixOS in same disk with other systems
To install NixOS on a partition along another system which controls the GRUB,
first disable the grub device, so the GRUB is not installed in the disk by
NixOS (only the /boot files will be generated):
```
boot.loader.grub.device = "nodev";
```
Then add the following entry to the old GRUB configuration:
```
menuentry 'NixOS' {
insmod chain
set root=(hd3,1)
search --no-floppy --label nixos --set root
configfile /boot/grub/grub.cfg
}
```
The partition with NixOS must have the label "nixos" for it to be found. New
system configuration entries will be stored in the GRUB configuration managed
by NixOS, so there is no need to change the old GRUB settings.