Ashok Sharma wrote:
Am using Fedora 4 kernel 2.6.16.13 and kernel panics
when I try to boot from rebuilt kernel
The error msg is device-mapper missing from kernel?
How do I fix this problem
During the kernel build phase, did you switch on the support for Device
Mapper Support which is under the Multi-device Support (RAID and LVM) --->
Besides that you might have to generate a new initrd depending on the
distro you use.
Regards,
V. Ananda Krishnan
--- Ashok Sharma <aks6d@xxxxxxxxxxx> wrote:
I am getting the Msg device mapper missing from
kernel
How do I fix this problem
Ashok
--- rohit hooda <rohit13hooda@xxxxxxxxxxxxxx>
wrote:
On Tue, 09 May 2006 Jesper Juhl wrote :
On 5/8/06, Arjan van de Ven <arjan@xxxxxxxxxxxxx>
wrote:
On Mon, 2006-05-08 at 08:25 -0300, Jeronimo
Zucco
wrote:
Arjan van de Ven wrote:
May be this is caused by UDEV support.
usually when this happens you forgot to use
an initrd.
The easiest way to do that is to just do
"make install" as last step in
building the kernel, that makes an initrd
for
you and also adds the
kernel and initrd correctly to grub.conf
And if you not want use initrd ?
why don't you? Can you explain what you have
against using an initrd?
I don't know what Jeronimo has against initrd's,
but I can tell you
what I have against them.
An initrd complicates things.
It's one more thing to remember to build.
It's one more thing that can potentially break.
If you just build into the kernel whatever you
need
to get to the
point of mounting the root fs (or want to have
available early) and
then anything else you need as modules, then an
initrd is pretty
pointless, and it's a much more simple setup IMO.
Fedora requires an initrd for several parts;
udev
is one of them,
mount-by-label another, selinux a third.
I'm not a Fedora user, so I don't know what
initrd
assumptions are
build into it, but I've never had a need for an
initrd with Slackware
- I can build an use one if I want, sure, but it
has never been a
requirement in any way.
It's not like using an initrd has drawbacks that
I
know of, nor is it
hard; if you use "make install" it's automatic
as
I said, and that's a
convenient thing to use anyway (because it does
the bootloader stuff for
you)
Personally I consider "make install" dangerous.
First of all it assumes that I want my kernel to
be
named
/boot/vmlinuz and happily overwrites any previous
kernel image that
may exist by that name. So if my new kernel
doesn't
boot, and I only
have that one entry in my lilo.conf, then I'm in
trouble and have to
go find a CD to boot from to recover.
my friend this is not the case. In Fedora, the
vmlinuz get appended with the version number of
the
kernel as well to let you distinguish from the
other
kernel images in /boot directory. You can specify
this version in the Makefile in the
/usr/src/linux-2.6.xx path.
"
VERSION = 2
PATCHLEVEL = 6
SUBLEVEL = 12
EXTRAVERSION =
" ... a snippet from
/usr/src/linux-2.6.12/Makefile
this lets you specify the version numbers for ur
compilation. And also you System.map and the
initrd
and get appended with this version number as well.
It's not like it's hard to manually copy
System.map
& bzImage to /boot
under a unique name and add that new file to your
bootloader - I'd say
doing it by hand and keeping your old working
kernel in place as a
secondary option is a hell of a lot safer than
just
using "make
install".
--
Jesper Juhl <jesper.juhl@xxxxxxxxx>
Don't top-post
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Regards
Rohit Hooda
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