Hello all,
Grabbed a new kernel (from kernel.org) to build a custom kernel but it won't boot. I followed the directions at redhat to setup a box without initrd (which I don't want and don't need to use). But the system hangs. Has anyone built a custom kernel without using initrd? I'm using CentOS 4.2. It hangs at or after "Freeing unused memory"
Thanks.
excerpt from the page: (http://fedora.redhat.com/docs/udev/)
Udev without initrd
Install Fedore Core as usual and reboot. Execute the following commands
mkdir /tmp/dev mount --move /dev /tmp/dev sbin/MAKEDEV null console zero mount --move /tmp/dev /dev
Install your kernel without an initrd. Reboot.
You will get some SELinux errors, and syslogd will not work as expected.
On 12/11/05, Richard Hubbell richard.hubbell@gmail.com wrote:
Hello all,
Grabbed a new kernel (from kernel.org) to build a custom kernel but it won't boot. I followed the directions at redhat to setup a box without initrd (which I don't want and don't need to use). But the system hangs. Has anyone built a custom kernel without using initrd? I'm using CentOS 4.2. It hangs at or after "Freeing unused memory"
Thanks.
excerpt from the page: (http://fedora.redhat.com/docs/udev/)
Udev without initrd
Install Fedore Core as usual and reboot. Execute the following commands
mkdir /tmp/dev mount --move /dev /tmp/dev sbin/MAKEDEV null console zero mount --move /tmp/dev /dev
Install your kernel without an initrd. Reboot.
You will get some SELinux errors, and syslogd will not work as expected.
Why is it that you feel the need to rebuild the kernel?
The centos/rhel system is built atop a very heavily patched kernel. If you build from straight vanilla source from kernel.org, expect breakage. There are things like selinux, nptl, etc that will break for you, and may or may not cause apps to fail or behave erratically, the system to hang (seems like you found that one already) etc.
basically, if you need to rebuild the kernel, you should do so from within the most recent kernel source rpm. Anything else is going to cause issues, and you're likely to be on your own for help.
All that negativity aside, there's a tutorial on how to rebuild kernels via source rpm here: crab-lab.zool.ohiou.edu/kevin/kernel-compilation-tutorial-en/
Please. centos isn't gentoo and I'd advice not treating it as such if it's possible. If what you need isn't in the stock kernel, then look to the centosplus kernel. If it's not there, ask on the mailing list or on irc. Others may need what you're after if you have a valid reason.
-- Jim Perrin System Architect - UIT Ft Gordon & US Army Signal Center
Thanks Jim. I have a need, but if it won't work, it won't work. I may switch distribs if CentOS kernel is inextricably intertwined with the rest of the bits.
FWIW I don't need/want selinux and can get by without nptl if it proves troublesome. The kernel also has way too much stuff in it that I don't need, etc., etc.
The link you mention is broken. Dunno what gentoo's about so no comment there.
On 12/11/05, Jim Perrin jperrin@gmail.com wrote:
On 12/11/05, Richard Hubbell richard.hubbell@gmail.com wrote:
Hello all,
Grabbed a new kernel (from kernel.org) to build a custom kernel but it won't boot. I followed the directions at redhat to setup a box without initrd (which I don't want and don't need to use). But the system hangs. Has anyone built a custom kernel without using initrd? I'm using CentOS 4.2. It hangs at or after "Freeing unused memory"
Thanks.
excerpt from the page: (http://fedora.redhat.com/docs/udev/)
Udev without initrd
Install Fedore Core as usual and reboot. Execute the following commands
mkdir /tmp/dev mount --move /dev /tmp/dev sbin/MAKEDEV null console zero mount --move /tmp/dev /dev
Install your kernel without an initrd. Reboot.
You will get some SELinux errors, and syslogd will not work as expected.
Why is it that you feel the need to rebuild the kernel?
The centos/rhel system is built atop a very heavily patched kernel. If you build from straight vanilla source from kernel.org, expect breakage. There are things like selinux, nptl, etc that will break for you, and may or may not cause apps to fail or behave erratically, the system to hang (seems like you found that one already) etc.
basically, if you need to rebuild the kernel, you should do so from within the most recent kernel source rpm. Anything else is going to cause issues, and you're likely to be on your own for help.
All that negativity aside, there's a tutorial on how to rebuild kernels via source rpm here: crab-lab.zool.ohiou.edu/kevin/kernel-compilation-tutorial-en/
Please. centos isn't gentoo and I'd advice not treating it as such if it's possible. If what you need isn't in the stock kernel, then look to the centosplus kernel. If it's not there, ask on the mailing list or on irc. Others may need what you're after if you have a valid reason.
-- Jim Perrin System Architect - UIT Ft Gordon & US Army Signal Center _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
Richard Hubbell wrote:
Thanks Jim. I have a need, but if it won't work, it won't work. I may switch distribs if CentOS kernel is inextricably intertwined with the rest of the bits.
FWIW I don't need/want selinux and can get by without nptl if it proves troublesome. The kernel also has way too much stuff in it that I don't need, etc., etc.
The link you mention is broken. Dunno what gentoo's about so no comment there.
You shouldn't need to get a vanilla kernel just to get rid of stuff you don't need. Can't you do what Jim suggested and rebuild from the source RPM and disable all the bits that you don't need?
Just for your info.
Gentoo is a linux from scratch type of distro.
You build/compile the system to your own needs which obviously involves building a custom kernel from for instance the vanilla-sources at kernel.org.
rgds,
Peter
Richard Hubbell wrote:
Thanks Jim. I have a need, but if it won't work, it won't work. I may switch distribs if CentOS kernel is inextricably intertwined with the rest of the bits.
FWIW I don't need/want selinux and can get by without nptl if it proves troublesome. The kernel also has way too much stuff in it that I don't need, etc., etc.
The link you mention is broken. Dunno what gentoo's about so no comment there.
On 12/11/05, Jim Perrin jperrin@gmail.com wrote:
On 12/11/05, Richard Hubbell richard.hubbell@gmail.com wrote:
Hello all,
Grabbed a new kernel (from kernel.org) to build a custom kernel but it won't boot. I followed the directions at redhat to setup a box without initrd (which I don't want and don't need to use). But the system hangs. Has anyone built a custom kernel without using initrd? I'm using CentOS 4.2. It hangs at or after "Freeing unused memory"
Thanks.
excerpt from the page: (http://fedora.redhat.com/docs/udev/)
Udev without initrd
Install Fedore Core as usual and reboot. Execute the following commands
mkdir /tmp/dev mount --move /dev /tmp/dev sbin/MAKEDEV null console zero mount --move /tmp/dev /dev
Install your kernel without an initrd. Reboot.
You will get some SELinux errors, and syslogd will not work as expected.
Why is it that you feel the need to rebuild the kernel?
The centos/rhel system is built atop a very heavily patched kernel. If you build from straight vanilla source from kernel.org, expect breakage. There are things like selinux, nptl, etc that will break for you, and may or may not cause apps to fail or behave erratically, the system to hang (seems like you found that one already) etc.
basically, if you need to rebuild the kernel, you should do so from within the most recent kernel source rpm. Anything else is going to cause issues, and you're likely to be on your own for help.
All that negativity aside, there's a tutorial on how to rebuild kernels via source rpm here: crab-lab.zool.ohiou.edu/kevin/kernel-compilation-tutorial-en/
Please. centos isn't gentoo and I'd advice not treating it as such if it's possible. If what you need isn't in the stock kernel, then look to the centosplus kernel. If it's not there, ask on the mailing list or on irc. Others may need what you're after if you have a valid reason.
-- Jim Perrin System Architect - UIT Ft Gordon & US Army Signal Center _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
On Sun, 2005-12-11 at 20:53 -0800, Richard Hubbell wrote:
Thanks Jim. I have a need, but if it won't work, it won't work. I may switch distribs if CentOS kernel is inextricably intertwined with the rest of the bits.
FWIW I don't need/want selinux and can get by without nptl if it proves troublesome. The kernel also has way too much stuff in it that I don't need, etc., etc.
The link you mention is broken. Dunno what gentoo's about so no comment there.
Don't take Jim's post to be negative (or mine either).
The problem is that the Kernel and GLIBC are the pieces that everything else is built on ... and they are built to work together.
People think they are smarter than the paid developers at RH and they want to build a kernel that doesn't have stuff they don't need ... but that is not really required anymore.
With the adoption of modular kernels and initrd, you can dynamically load the items that you need and remove the ones that you don't, and lots of people get paid lots of money to make it happen right. So, we see a lot of people who mess up their systems because:
1. They want the latest and greatest kernel ... (CentOS is enterprise and therefore not latest and greatest)
2. They want to remove items from their kernel ... (That don't load anyway if they don't have a need, as they are kernel modules).
--------------- Now, if that is not you, then I apologize. But CentOS is painstakingly rebuilt to mirror the binaries of an upstream vendor so that it works exactly like that product ... and changing major bits of it (like kernel or glibc) changes the whole distro.
Also. there are literally thousands of RH specific patches in the kernel.
On 12/11/05, Jim Perrin jperrin@gmail.com wrote:
On 12/11/05, Richard Hubbell richard.hubbell@gmail.com wrote:
Hello all,
Grabbed a new kernel (from kernel.org) to build a custom kernel but it won't boot. I followed the directions at redhat to setup a box without initrd (which I don't want and don't need to use). But the system hangs. Has anyone built a custom kernel without using initrd? I'm using CentOS 4.2. It hangs at or after "Freeing unused memory"
Thanks.
excerpt from the page: (http://fedora.redhat.com/docs/udev/)
Udev without initrd
Install Fedore Core as usual and reboot. Execute the following commands
mkdir /tmp/dev mount --move /dev /tmp/dev sbin/MAKEDEV null console zero mount --move /tmp/dev /dev
Install your kernel without an initrd. Reboot.
You will get some SELinux errors, and syslogd will not work as expected.
Why is it that you feel the need to rebuild the kernel?
The centos/rhel system is built atop a very heavily patched kernel. If you build from straight vanilla source from kernel.org, expect breakage. There are things like selinux, nptl, etc that will break for you, and may or may not cause apps to fail or behave erratically, the system to hang (seems like you found that one already) etc.
basically, if you need to rebuild the kernel, you should do so from within the most recent kernel source rpm. Anything else is going to cause issues, and you're likely to be on your own for help.
All that negativity aside, there's a tutorial on how to rebuild kernels via source rpm here: crab-lab.zool.ohiou.edu/kevin/kernel-compilation-tutorial-en/
Please. centos isn't gentoo and I'd advice not treating it as such if it's possible. If what you need isn't in the stock kernel, then look to the centosplus kernel. If it's not there, ask on the mailing list or on irc. Others may need what you're after if you have a valid reason.
-
Jim Perrin -
Johnny Hughes -
Peter van Eck -
Richard Hubbell -
Tim Edwards