Re: [Xen-users] How to stop yum update on CentOS 5.1 to modify grub

[Stephan Seitz <s.seitz@xxxxxxxxxxxx>]

Rudi Ahlers schrieb:
> Hi all
>
> I just got a shocker today on a CentOS 5.1 x64 Xen server where the xen 
> VPS didn't work properly so I thought I'd reboot it, but upon reboot it 
> gave me some memory errors, so I rebooted the server and couldn't start 
> Xen at all. Then after poking around I thought I'd check to see if the 
> Xen kernel is running, and it's not running. It seem yum updated has 
> updated the kernel, and then updated grub to use the new CentOS kernel, 
> which is what it's supposed todo. But how do I stop yum from doing it?
I wouldn't hack into packet managers. It's better to use menu.lst itself to
reflect the changes you want.

I don't know which version of grub centos uses, but on recent debian/ubuntu
systems, there are commented lines which are used for default values.

e.g.
## Xen hypervisor options to use with the default Xen boot option
# xenhopt=vtd=1

## Xen Linux kernel options to use with the default Xen boot option
# xenkopt=console=tty0 swiotlb=128 max_loop=64

and

## If you want special options for specific kernels use kopt_x_y_z
## where x.y.z is kernel version. Minor versions can be omitted.
## e.g. kopt=root=/dev/hda1 ro
##      kopt_2_6_8=root=/dev/hdc1 ro
##      kopt_2_6_8_2_686=root=/dev/hdc2 ro
# kopt=root=UUID=2c9954c1-d8f5-477a-a808-39f768b10ac3 ro

## additional options to use with the default boot option, but not with the
## alternatives
## e.g. defoptions=vga=791 resume=/dev/hda5
# defoptions=quiet splash

results in

title           Xen 3.2 / Ubuntu 7.10, kernel 2.6.18.8-xen
root            (hd0,0)
kernel          /xen-3.2.gz vtd=1
module          /vmlinuz-2.6.18.8-xen 
root=UUID=2c9954c1-d8f5-477a-a808-39f768b10ac3 ro console=tty0 swiotlb=128 
max_loop=64
module          /initrd.img-2.6.18.8-xen
quiet

after running update-grub.

Well, assuming you've appropriate xen, vmlinuz, initrd and System.map files in 
place ;)


HTH

Cheers,

Stephan

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