CentOS virt - Nov 2013 - new-kernel-pkg needs to be made Xen-aware

I ran "yum update" the other day on my dom0 and let it pull a new
kernel.
The RPM install scriptlet runs /sbin/new-kernel-pkg (part of the grubby 
package) to update grub.conf. It writes a new record to boot the Linux 
kernel instead of Xen. It would be nice if it noticed that it was running 
inside Xen and wrote a suitable record for that.

And it would be nice if it could read your mind and give you a foot
massage, too. Same thing happens if you install both
java-1.6.0-openjdk and jdk-1.7.0 packages at the same time, the system
guesses that whichever one you installed last should be default.

Delete the non "kernel-xen" kernels, and you should be good to go. for
future updates.

On Sat, Nov 23, 2013 at 1:07 PM, Kenneth Porter <shiva at sewingwitch.com>
wrote:
> I ran "yum update" the other day on my dom0 and let it pull a new
kernel.
> The RPM install scriptlet runs /sbin/new-kernel-pkg (part of the grubby
> package) to update grub.conf. It writes a new record to boot the Linux
> kernel instead of Xen. It would be nice if it noticed that it was running
> inside Xen and wrote a suitable record for that.
> _______________________________________________
> CentOS-virt mailing list
> CentOS-virt at centos.org
> http://lists.centos.org/mailman/listinfo/centos-virt

On 11/23/2013 12:07 PM, Kenneth Porter wrote:
> I ran "yum update" the other day on my dom0 and let it pull a new
kernel.
> The RPM install scriptlet runs /sbin/new-kernel-pkg (part of the grubby 
> package) to update grub.conf. It writes a new record to boot the Linux 
> kernel instead of Xen. It would be nice if it noticed that it was running 
> inside Xen and wrote a suitable record for that.
>
We are aware of this issue and for now, you have to manually run
/usr/bin/grub-bootxen.sh

We are also aware that the setup that grub-bootxen.sh provides is very
basic and does not learn/keep custom settings.

This is something that we would love to receive community input to fix.

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On 11/24/2013 08:14 AM, Johnny Hughes wrote:
> On 11/23/2013 12:07 PM, Kenneth Porter wrote:
>> I ran "yum update" the other day on my dom0 and let it pull a
new
>> kernel. The RPM install scriptlet runs /sbin/new-kernel-pkg (part
>> of the grubby package) to update grub.conf. It writes a new
>> record to boot the Linux kernel instead of Xen. It would be nice
>> if it noticed that it was running inside Xen and wrote a suitable
>> record for that.
>> 
> 
> We are aware of this issue and for now, you have to manually run 
> /usr/bin/grub-bootxen.sh
> 
> We are also aware that the setup that grub-bootxen.sh provides is
> very basic and does not learn/keep custom settings.
> 
> This is something that we would love to receive community input to
> fix.
Modifying the spec file for the Xen kernel package to call an
additional script in %post should be trivial, and since this kernel
package doesn't come from upstream you should be free to do so.

The issue with using grubby is that grubby expects the kernel to be
defined in the kernel line and the initrd in the initrd line.  But
with Xen boot entries both are defined in module lines instead.  It
shouldn't bee too difficult to eitehr write a new script that would
work similar to grubby but looks at the module lines instead, or to
modify grubby itself to do so.

Note that I (and I would think some others) like to have two boot
entries for each new kernel.  One that boots via the Xen hypervisor
and a second that boots directly to the kernel itself, I would love to
see such a script be able to copy both of these entries when
installing a new kernel.


Peter
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