On 09/26/2016 04:29 AM, johan.vermeulen7@telenet.be wrote:

----- Oorspronkelijk bericht ----- Van: "Jim Perrin" jperrin@centos.org Aan: centos@centos.org Verzonden: Donderdag 22 september 2016 17:19:42 Onderwerp: Re: [CentOS] always boot from Elrepo kernel

On 09/22/2016 10:14 AM, johan.vermeulen7@telenet.be wrote:

...

Hello All,

I purchased some Dell Latitude 3570 laptops. They came with Ubuntu preinstalled. ( Which I swapped for Centos7) I have to use Elrepo kernel on these machines to get some of the fn function keys to work. So I installed Elrepo's kernel-ml and selected this kernel with: # grub2-set-default 0 ( after disabling secure boot)

The problem I see is that after a next kernel update, the new Centos kernel will be nr 0 and the machine will boot from that kernel if I tested this correctly.

Is there a way I can enable elrepo kernel update but not the regular Centos kernel?

I believe you need to update /etc/sysconfig/kernel to set the 'default' kernel package to be the kernel-ml or whichever elrepo kernel you're using.

Hello Jim,

thanks for the reply. For some reason that doesnt' work. To test this I booted from an older kernel and removed the most recent Centos-kernel After installing Elrepo's kernel-ml the system boots from kernel-ml, with or without changing /etc/sysconfig/kernel to DEFAULTKERNEL=kernel-ml But after running an update again, and reinstalling the latest Centos kernel, the system boots from that kernel again.

There is no reason to keep the CentOS Kernel on your machines if the elrepo kernel is what you want to use.

You should be able to (1) boot from an elrepo kernel then do:

rpm -qa | grep kernel | sort

then pick out the CentOS kernels and do:

rpm -e <kernel> <kernel1>

where <kernel> and <kernel1> are the name-version of the kernel you want to remove.

Then you should not get updates for the CentOS Kernels, only for elrepo ones.

The advice Jim gave you will then allow an update of 'kernel-ml' to actually update the grub.

One thing to think about is that you need to update some other packages besides kernel to use the latest kernels on CentOS. These include xfsprogs, where without the new fsck.xfs, you can not properly fix errors in an xfs file system. See this bugL

https://bugzilla.redhat.com/show_bug.cgi?id=1314605

You can get a fairly updated kernel and xfsprogs (and a new supermin and some other packages here):

http://mirror.centos.org/altarch/7/experimental/x86_64/Packages/

You can exclude the kernel and just grab the xfsprogs if you want as well.

My plan is to update that repo to the latest 4.4.x periodically while the 4.4 tree is in LTS. I will move that branch to another kernel once LTS 4.4 support stops.

NOTE: I am not suggesting that kernel is better than any of the elrepo kernels, nor am I trying to compete with those kernels. I created this kernel for arm32 and i686 (and possibly aarch64) for the altarch SIGs so that we can support newer IoT products .. I also intend to build the x86_64 because we can and to give IoT users the ability to have the same kernel across several arches. I love elrepo and use it on several machines .. either choice is absolutely fine :)

Thanks, Johnny Hughes

On 09/26/2016 03:14 PM, Johnny Hughes wrote:

On 09/26/2016 04:29 AM, johan.vermeulen7@telenet.be wrote:

...

----- Oorspronkelijk bericht ----- Van: "Jim Perrin" jperrin@centos.org Aan: centos@centos.org Verzonden: Donderdag 22 september 2016 17:19:42 Onderwerp: Re: [CentOS] always boot from Elrepo kernel

On 09/22/2016 10:14 AM, johan.vermeulen7@telenet.be wrote:

...

Hello All,

I purchased some Dell Latitude 3570 laptops. They came with Ubuntu preinstalled. ( Which I swapped for Centos7) I have to use Elrepo kernel on these machines to get some of the fn function keys to work. So I installed Elrepo's kernel-ml and selected this kernel with: # grub2-set-default 0 ( after disabling secure boot)

The problem I see is that after a next kernel update, the new Centos kernel will be nr 0 and the machine will boot from that kernel if I tested this correctly.

Is there a way I can enable elrepo kernel update but not the regular Centos kernel?

I believe you need to update /etc/sysconfig/kernel to set the 'default' kernel package to be the kernel-ml or whichever elrepo kernel you're using.

Hello Jim,

thanks for the reply. For some reason that doesnt' work. To test this I booted from an older kernel and removed the most recent Centos-kernel After installing Elrepo's kernel-ml the system boots from kernel-ml, with or without changing /etc/sysconfig/kernel to DEFAULTKERNEL=kernel-ml But after running an update again, and reinstalling the latest Centos kernel, the system boots from that kernel again.

There is no reason to keep the CentOS Kernel on your machines if the elrepo kernel is what you want to use.

Well you might want to use kernel-ml by default and still get the Centos kernels installed so you can test them when updates are released, and move back to them when they start supporting your hardware. In any case it does seem that DEFAULTKERNEL in /etc/sysconfig/kernel is not working as expected in C7. I'm pretty sure it worked in Centos6.