[CentOS] Creating the symbolic links in the /boot and /boot/grub/

Todd Cary todd at aristesoftware.com
Wed Mar 9 22:16:21 UTC 2011 

Unfortunately, I live out with the cows, so I am using DSL to 
download the latest - it will take awhile.  It has been awhile 
since I downloaded the four disks, however I assume disk 1 
contains all that I need to do a "rescue".

Once I get that down, I will use torrent to get all four disks.

Hey, guys, many thanks.  Any of you live in the SF Bay Area?  
Love to treat you to a beer.

Todd

On 3/9/2011 1:03 PM, Simon Matter wrote:
>> And here are the contents of grub.conf:
>>
>> # grub.conf generated by anaconda
>> #
>> # Note that you do not have to rerun grub after making changes to
>> this file
>> # NOTICE:  You have a /boot partition.  This means that
>> #          all kernel and initrd paths are relative to /boot/, eg.
>> #          root (hd0,0)
>> #          kernel /vmlinuz-version ro root=/dev/VolGroup00/LogVol00
>> #          initrd /initrd-version.img
>> #boot=/dev/hdc
>> default=0
>> timeout=5
>> splashimage=(hd0,0)/grub/splash.xpm.gz
>> hiddenmenu
>> title CentOS (2.6.9-100.EL)
>>       root (hd0,0)
>>       kernel /vmlinuz-2.6.9-100.EL ro
>> root=/dev/VolGroup00/LogVol00 rhgb quiet
>>       initrd /initrd-2.6.9-100.EL.img
> OK, the file listing of /boot from your last mail and now grub.conf, they
> look quite good. grub.conf has been updated by the kernel update, and also
> a new initrd-2.6.9-100.EL.img has been created, so that doesn't look bad.
>
> The only thing I'm not really sure is if grub is installed correctly now.
> Maybe you have to run grub-install again to be sure but I'm just not so
> sure about grubs internals. Maybe someone can tell you more about this.
>
> As someone else mentioned, it's a very good idea to have a current CentOS
> 4.8 disk at hand so you could boot into rescue mode with 'linux rescue' at
> the boot prompt if somethings goes wrong.
>
> Simon
>
>> Todd
>>
>> On 3/9/2011 12:23 AM, Simon Matter wrote:
>>>> I inadvertently missed using the list...here are my recent messages.
>>> As Nico suggested, download the kernel but also grub and redhat-logos,
>>> like so
>>> wget
>>> http://mirrors.kernel.org/centos/4.9/updates/i386/RPMS/kernel-2.6.9-100.EL.i686.rpm
>>> wget
>>> http://mirrors.kernel.org/centos/4.9/os/i386/CentOS/RPMS/redhat-logos-1.1.26-1.centos4.4.noarch.rpm
>>> wget
>>> http://mirrors.kernel.org/centos/4.9/os/i386/CentOS/RPMS/grub-0.95-3.8.i386.rpm
>>>
>>> Then do a
>>>
>>> rpm -Uvh --replacepkgs --replacefiles kernel-2.6.9-100.EL.i686.rpm
>>> redhat-logos-1.1.26-1.centos4.4.noarch.rpm grub-0.95-3.8.i386.rpm
>>>
>>> And the show us the contents of 'ls -laR /boot' and 'cat /etc/grub.conf'
>>>
>>> Simon
>>>
>>>> On 3/8/2011 8:39 PM, Nico Kadel-Garcia wrote:
>>>>> On Tue, Mar 8, 2011 at 11:31 PM, Todd Cary<todd at aristesoftware.com>
>>>>> wrote:
>>>>>> reinstall is not an option for yum.  I ran "yum install kernel" and
>>>>>> it
>>>>>> completed without errors however there are no links created.
>>>>> Oh, dear. Can you grab the RPM and do "rpm -U -replacepkgs
>>>>> [kernel-whatver].rpm"? You should be able to use "yum remove" on the
>>>>> old kernel packages, consistent with freeing up the space, and now
>>>>> install your new kernel with yum.
>>>>>
>>>>>> Would this be the correct ln command for vmlinuz-2.6.9-89.35.1
>>>>>>
>>>>>> # /boot/vmlinuz-2.6.9-89.35.1 /boot/vmlinuz
>>>>>>
>>>>>> Todd
>>>>>>
>>>>>> On 3/8/2011 7:04 PM, Nico Kadel-Garcia wrote:
>>>>>>> On Tue, Mar 8, 2011 at 9:58 PM, Todd Cary<todd at aristesoftware.com>
>>>>>>> wrote:
>>>>>>>> I started a new thread since the original one is getting rather
>>>>>>>> long.
>>>>>>>>
>>>>>>>> I have retrieved the files I deleted in /boot and /boot/grub,
>>>>>>>> however I need to make links for
>>>>>>>>
>>>>>>>> /boot/System.map  (System.map ->      System.map-2.6.9-89.35.1)
>>>>>>>> /boot/vmlinuz  (vmlinuz ->      vmlinuz-2.6.9-89.35.1)
>>>>>>>> /boot/grub/menu.lst (menu.lst ->      ./grub.conf)
>>>>>>> Instead, re-install your kernel. "yum reinstall kernel". This should
>>>>>>> regenerate your symlinks correctly, except possibly the grub.conf.
>>>>>>>
>>>>>>>> If it was not so important to get it correct, I would appreciate
>>>>>>>> the syntax for the command.  Usually I would figure it out.
>>>>>>>>
>>>>>>>> Since I have restored the files (I will double check to make sure
>>>>>>>> they are all there), do I need to run grub-install?
>>>>>>> i think yes. The old location of the boot loader is listed in
>>>>>>> /boot/grub/grub.conf, and should be used as the argument to that
>>>>>>> command. grub is much smarter than LILO used to be, but I think the
>>>>>>> bootstrap procedure relies on knowing details of where the fiddly
>>>>>>> bits
>>>>>>> of grub live on the relevant ex2 compatible filesytem.
>>>>>>>
>>>>>>>> My apologies for bothering everyone with such a dumb error on my
>>>>>>>> part.
>>>>>>>>
>>>>>>>> Todd
>>>>>>>>
>>>>>>>> --
>>>>>>>> Ariste Software
>>>>>>>> Petaluma, CA 94952
>>>>>>>>
>>>>>>>> http://www.aristesoftware.com
>>>>>>>>
>>>>>>>> _______________________________________________
>>>>>>>> CentOS mailing list
>>>>>>>> CentOS at centos.org
>>>>>>>> http://lists.centos.org/mailman/listinfo/centos
>>>>>>>>
>>>>>> --
>>>>>> Ariste Software
>>>>>> Petaluma, CA 94952
>>>>>>
>>>>>> http://www.aristesoftware.com
>>>>>>
>>>>>>
>>>> --
>>>> Ariste Software
>>>> Petaluma, CA 94952
>>>>
>>>> http://www.aristesoftware.com
>>>>
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>>>>
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>>>
>> --
>> Ariste Software
>> Petaluma, CA 94952
>>
>> http://www.aristesoftware.com
>>
>
>

-- 
Ariste Software
Petaluma, CA 94952

http://www.aristesoftware.com

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