topic Re: Kernel compiling in red hat Linux in Operating System - Linux

Kernel compiling in red hat Linux

Waqar Razi — Sat, 21 Mar 2009 22:00:56 GMT

I am an HP Unix administrator and new to Red Hat Linux. Can some one please give me steps to compile kernel in red hat Linux 5 lets say if you want to change some kernel parameters and recompile the kernel.

Detailed steps are highly appreciated and I will give 10 points for that.

Re: Kernel compiling in red hat Linux

Ivan Krastev — Sat, 21 Mar 2009 23:45:01 GMT

Have a look here - http://www.redhat.com/docs/manuals/linux/RHL-9-Manual/custom-guide/s1-custom-kernel-modularized.html

regards,
ivan

Re: Kernel compiling in red hat Linux

avizen9 — Sun, 22 Mar 2009 02:57:48 GMT

its here good one,
check this
http://www.digitalhermit.com/linux/Kernel-Build-HOWTO.html

Re: Kernel compiling in red hat Linux

Ivan Ferreira — Sun, 22 Mar 2009 03:49:28 GMT

>>> if you want to change some kernel parameters and recompile the kernel.

Kernel parameters are changed on the fly by using the /proc subsystem.

You can check all kernel parameters with:

sysctl -a

You then can change them with:

sysctl -w

You can make the changes permanent editing /etc/sysctl.conf.

You can apply the changes to /etc/sysctl.conf using:

sysctl -p

And to compile the kernel, use the above links.

Re: Kernel compiling in red hat Linux

Vitaly Karasik_1 — Sun, 22 Mar 2009 09:26:51 GMT

You don't need to re-compile linux kernel in order to change kernel parameters.
There is "sysctl" interface for tuning kernel params on-the-fly, see for example this article

http://www.linux.com/feature/146599

Re: Kernel compiling in red hat Linux

Asif Sharif — Sun, 22 Mar 2009 16:46:03 GMT

Salam Waqar,

http://www.linux-faqs.com/Forum/viewtopic.php?t=24

http://www.linuxdocs.org/HOWTOs/Kernel-HOWTO-2.html

Regards,
Asif Sharif

Re: Kernel compiling in red hat Linux

dirk dierickx — Mon, 23 Mar 2009 08:24:00 GMT

normally you do _not_ need to recompile the kernel. if changing params just use sysctl (check the man page for all possible info).

recompiling the kernel on linux is only needed if you are changing the source code.

also note that RH will only support their supplied pre-compiled kernels. so when you go round using your own you are out of support.

second note, if a new kernel is available containing bug fixes & security fixes you will need to compile your kernel again from the new source and apply your patches yourself.