[CentOS] Re: "yum update" did not update kernel on one box

Wed May 7 22:46:04 UTC 2008
Scott Silva <ssilva at sgvwater.com>

on 5-7-2008 3:19 PM Kai Schaetzl spake the following:
> Lanny Marcus wrote on Wed, 07 May 2008 15:10:58 -0500:
>> Kai: I am not using Windows Boot Manager. Grub comes up, as on the 2
>> boxes, where things are working properly.
> Just to be sure, it's really grub? You get a somewhat blueish screen that 
> says "booting centos in x seconds, press any key to see options" or so? I 
> think there's also a CentOS symbol on it, but am not sure. We have to be 
> absolutely sure about that.
> And if you select Windows from that boot screen, does that boot right into 
> Windows or do you get another boot menu that lists only Windows?
>> Questions: (a) Can I copy /boot/grub/grub.conf on my box and replace
>> that file on my wife's box, with my version? Would that work OK? Worth a
>> try?
> No, this wouldn't help, because the grub.conf that *we know of* is fine. 
> It's just not getting used, because you are booting from another one. 
> AFAIK, grub cannot embed a boot menu in the MBR (Master Boot Record), so 
> that information must be coming from somewhere else.
> You have *two* grub.conf's (and two /boot partitions) on the machine 
> AFAIS. You would have to *merge* the two: you need the options for booting 
> Windows from the first one and all the other options from the second one.
> AFAIK, the MBR on your disk does not boot from hd(0,2), but from another 
> partition. You have to find out which one that is and change the grub.conf 
> on that partition accordingly. The caveat of this is that you would have 
> to do this each time the kernel changes or you would need to change a bit 
> more, so that this becomes the new boot partition.
> Another option would be to grub-install again and overwrite the current 
> information in the MBR, so that it then boots from hd(0,2).
> I'm not confident enough about both options to talk you thru.
> Maybe I'm missing other possibilities why that happens, but the basic 
> problem is that your machine does not boot from that hd(0,2), but with 
> information from elsewhere.
>> There was confusion on my part, when I installed Windows XP on my wife's
>> box. Hers was the first one I installed Win XP on, which I'd never
>> installed before and it ended up getting installed more than once.
> Did you install it after CentOS or before it?
> You will need to make a list of all partitions. Not sure what the best way 
> to do this would be. Probably fdisk. Run fdisk, then type "p" (for 
> printing the partition table), then leave it with "q". Be careful, as 
> printing the table is only the least dangerous action in fdisk!
> Kai
Fdisk -l ( lower case L )should list ALL partitions and their respective 
devices without worrying about breaking something.

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