How to install grub2 on FreeBSD

Yampress · #1 December 20th, 2011, 19:43

How to install grub2, which may be useful to run multiple systems described below. Of course, previously tested by me like everyone my faq.

THE WORKS
All I do the following as root.
Install grub 2 first. I do it with packages

Code:

pkg_add-r grub2

Prepares the directory structure

Code:

cd /boot
mkdir grub
cd grub
touch grub.cfg

For grub.cfg adds the following entry

Code:

set timeout = 3
set default = "0"
menuentry "FreeBSD 8 Server" {
insmod ufs2
     set root = (hd0, 1)
chainloader 1
}

Code:

set root = (hd0, 1)

This is for disk 1, and ~~freebsd~~ FreeBSD installed on the first slice.

Code:

set root = (hd0, 3)

This is for disk 1, and freebsd installed on the third slice.
And just for themselves similarly change the parameters ...

Now copies the files to the right place to /boot/grub

Code:

cp-Rf /usr/local/lib/grub/i386-pc /boot/grub

Before you install grub in the MBR disk must be allowed to overwrite the MBR ~~freebsd~~ FreeBSD
If we do not, ~~freebsd~~ FreeBSD will not be able to install grub in the MBR.

Code:

sysctl kern.geom.debugflags = 16

And that's it. It remains to install grub

Code:

grub-install /dev/ad0

If a message pops up like this, everything is ok

Code:

freebsdserver # grub-install /dev/ad0
Installation finished. No error reported.
freebsdserver #

After installation, it looks like this

Now you can add other systems. windows, linux and bsd other configuration file.

**wblock@** · #2 December 20th, 2011, 21:26

Quote:

Originally Posted by Yampress

Before you install grub in the MBR disk must be allowed to overwrite the MBR ~~freebsd~~ FreeBSD
If we do not, ~~freebsd~~ FreeBSD will not be able to install grub in the MBR.

Code:

sysctl kern.geom.debugflags = 16

That setting actually allows writes to areas of the disk that are in use by geom. Typically that's for the very special case of writing to an important block of a mounted partition. The MBR should not need that, and in fact it should be very rare to need that sysctl at all.

(Some of the misunderstanding is my fault, since I didn't understand it and promoted the misuse in a couple of articles. Sorry about that.)

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The Following 2 Users Say Thank You to Yampress For This Useful Post:
markfisher (January 26th, 2012), wblock@ (December 20th, 2011)