[CentOS] Missing /etc/ld.so.conf.d/kernel-3.10.0-1127.19.1.el7.x86_64.conf

Wed Apr 14 15:44:24 UTC 2021
Valeri Galtsev <galtsev at kicp.uchicago.edu>

On 4/14/21 10:17 AM, Johnny Hughes wrote:
> On 4/12/21 9:56 AM, Valeri Galtsev wrote:
>> On 4/12/21 8:34 AM, Johnny Hughes wrote:
>>> On 4/11/21 11:32 AM, Kenneth Porter wrote:
>>>> I'm yum updating some CentOS 7 systems today and got this error. Two
>>>> systems (so far) seem to have rebooted fine. Should I worry?
>>>> error: file /etc/ld.so.conf.d/kernel-3.10.0-1127.19.1.el7.x86_64.conf:
>>>> No such file or directory
>>> The kernel does does contain that file.  In CentOS linux 7 (and 8), the
>>> file is actually blank .. well is has one comment line:
>>> # Placeholder file, no vDSO hwcap entries used in this kernel.
>>> If you want the error to go away, just as the root user, do:
>>> touch /etc/ld.so.conf.d/kernel-3.10.0-1127.19.1.el7.x86_64.conf
>>> chmod 444 /etc/ld.so.conf.d/kernel-3.10.0-1127.19.1.el7.x86_64.conf
>>> The above 2 commands should create a zero size file there and prevent
>>> the error.
>>> As to how you got the error .. it seems there is an issue with the
>>> kernel-3.10.0-1127.19.1.el7.x86_64 install on your machine, it is at
>>> least missing that file.  If you are using that kernel .. you might want
>>> to re-install it instead to make sure all the files are there.  There is
>>> a newer kernel released for EL7.
>>> As to the purpose of /etc/ld.so.conf.d/, info here:
>>> https://linux.101hacks.com/unix/ldconfig/
>> That is the general description of ldconfig, which is transparent and
>> clear as to what ldconfig purpose is.
>> What is puzzling for me (I'm sure you are answering my question): why
>> anything related to kernel package should be needed for automatically
>> searching for shared libraries to be loaded (when one uses anything
>> linked to shared libraries)? What kernel package brings that can have
>> anything to do with that??!
>> Thanks for insights!
>> Valeri
> Well, that is a good question, since the kernel boot starts very early
> in the process.  I suppose it is possible that some hardware drivers for
> kernel modules MIGHT need a path to external shared libraries.
> All I know for sure is that the capability to have an external ldconfig
> path exists for the kernel (ie, it is built in).  I do not ever remember
> this being actually populated. But the capability has existed for a long
> time.

And it is itching to add: for no apparent reason whatsoever.

And the puzzle still stands.

Thanks, Johnny!


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Valeri Galtsev
Sr System Administrator
Department of Astronomy and Astrophysics
Kavli Institute for Cosmological Physics
University of Chicago
Phone: 773-702-4247