Greetings

Is it possible to load the kernel and the initramfs from an LVM partition? I am doing some tests and i have setup my CentOS full with LVMs, appart from the /boot partition. In other words

/dev/sda
|
|
----/dev/sda1 --> /boot
|
|---/dev/sda2--->/dev/vg0/lvm_root --> /

I have made a fodler called "kernels" /kernels and inside that folder a i have a kernle with the initrd.

Is it possible to configure Grub to load the kernel and the initramfs from /kernels folder?

Is there any reason you're not using the normal /boot for kernels?

Regardless, should be able to load those kernels from where you want them. Just use the appropriate parameters (initrd, etc.). Make sure you have root set appropriately so that GRUB will know where to find the other filesystems.

Possibly yes, grub2 has a lvm module. But as far as I know grub itself needs an ext2/3 partition to store its own stuff, like before mentioned lvm.mod.
So you still need a small /boot partition.
The question is then, why go through a lot of trouble to put the kernel on the lvm when there is a useful partition already.

Cheers

I believe this used to be the case, but is no longer true.

BTW, the OP did not post what version of GRUB. If this is GRUB Legacy (a.k.a. GRUB 1, a.k.a. GRUB 0.9.x), then no GRUB can not load a kernel from an LVM volume. I unfortunately made the assumption as well that s/he did in fact mean GRUB 2.

If it is in fact GRUB 2, see below, it may give you a start.

https://wiki.archlinux.org/index.php/GRUB#LVM

Each distrubtion has different methods for modifying the GRUB configuration. The Fedora GRUB2 wiki (https://fedoraproject.org/wiki/GRUB_2) may give you help, I couldn't find anything specific to GRUB 2 and CentOS.

I use normal boot for kernels but i am just learning about grub and how it operates. So there is this excerises that shows you have you can instruct grub to load initramfs and kernel from places other than root.

I did create another stabdard partition and completed the excerise but i was just curious how could you possibly load them from an lvm.

For instance, when i made the partition /dev/sdb2 i changed my brub config from

to

but how do you point root to an lvm partition?

See my post above yours, I had posted at the same time. What version of GRUB are we talking about, 1 or 2? With GRUB 1 it is *not* possible to load a kernel image from LVM, with GRUB 2 it is.

1 members found this post helpful.

Hi Goumba

Yes i use Grub2 . Thnaks for the information.

I am not planning to use any lvm partiotionas as boot and my question was pure quriocity.

Thnaks for the info again