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

Todd Cary todd at aristesoftware.com
Thu Mar 10 15:19:10 UTC 2011 

Well, I have the disks in hand - all 4, but there is the 
overriding level of apprehension.  Is there a reference to what I 
should do *if* I cannot reboot that I should read?

Also, after reading the responses to my query about using FAT32 
to store data, I decided to follow the suggestions to use Samba 
to copy the data that needs to be shared with others to my 
Windows connected NTFS external.  So, I am in the process of 
doing that first even though I have an ext3 backup of the same data.

Preparing to jump as I look for my spare parachute....

Todd

On 3/10/2011 2:15 AM, Simon Matter wrote:
>> 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".
> Yes that's correct, you need to download only disk 1.
>
>> 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.
> Thanks, but it may be a bit difficult. Just let us know if you have been
> able to boot successfully.
>
> Simon
>
>> 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
>>>>>>
>>>>>> _______________________________________________
>>>>>> CentOS mailing list
>>>>>> CentOS at centos.org
>>>>>> http://lists.centos.org/mailman/listinfo/centos
>>>>>>
>>>>> _______________________________________________
>>>>> CentOS mailing list
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>>>>>
>>>>>
>>>> --
>>>> Ariste Software
>>>> Petaluma, CA 94952
>>>>
>>>> http://www.aristesoftware.com
>>>>
>>>
>> --
>> Ariste Software
>> Petaluma, CA 94952
>>
>> http://www.aristesoftware.com
>>
>
>

-- 
Ariste Software
Petaluma, CA 94952

http://www.aristesoftware.com

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