Am 28.10.21 um 18:09 schrieb Andrew C Aitchison:
> On Thu, 28 Oct 2021, Götz Waschk wrote:
>
>> Am 28.10.21 um 15:41 schrieb Troy Dawson:
>>>
>>>
>>> On Thu, Oct 28, 2021 at 4:56 AM Götz Waschk <[log in to unmask]
>>> <mailto:[log in to unmask]>> wrote:
>>>
>>> Am 26.10.21 um 04:27 schrieb Patrick J. LoPresti:
>>> > On Mon, Oct 25, 2021 at 5:45 PM Nico Kadel-Garcia
>>> <[log in to unmask] <mailto:[log in to unmask]>
>>> > <mailto:[log in to unmask] <mailto:[log in to unmask]>>> wrote:
>>> > >
>>> > > It's getting harder.
>>> >
>>> > Singularity containers for CentOS 8 (and latest Ubuntu etc.) work
>>> fine
>>> > on SL7, for now. Of course this is not a long-term solution,
>>> since
>>> > "kernel too old" will surely crop up eventually.
>>> I just like to add that this has already happened to me with an
>>> Ubuntu
>>> 20.04 LTS container running on
>>> SL7:
>>>
>>> [wgs34:U20] ~ % gnuplot-qt
>>> gnuplot-qt: error while loading shared libraries: libQt5Core.so.5:
>>> cannot open shared object file: No such file or directory
> ... snip ...
>>> That doesn't have much to do with the container running on SL7, and
>>> more that your gnuplot-qt was compiled on a different qt5 than is in
>>> the container.
>>>
>>> Without more details I couldn't exactly say more than make sure your
>>> gnuplot-qt and qt5 libraries in yoru container are up to date.
>>
>> Hi Troy,
>>
>> it is related to the SL7 kernel. The container contains a standard
>> Ubuntu 20.04 LTS installation with the default gnuplot package. The
>> problem disappears when I run the same singularity container on
>> AlmaLinux 8.4 or Ubuntu 18.04 LTS.
> The practice of containers seems to be to make them fast and lightweight
> by using host libraries as much as possible, which is not compatible with
> portability.
>
> This problem is not caused by what I would call "the SL7 kernel".
> Have containers hijacked the word "kernel" to mean something like
> "the assumed base system including common libraries" ?
Dear Andrew,
while it is possible to bind-mount libraries into a singularity
container, this didn't happen here.
To proof that it depends on the kernel, I have installed the Oracle UEK
kernel on my test machine:
# uname -r
5.4.17-2136.300.7.el7uek.x86_64
# cat /etc/redhat-release
Scientific Linux release 7.9 (Nitrogen)
# singularity exec U20.img gnuplot-qt
G N U P L O T
Version 5.2 patchlevel 8 last modified 2019-12-01
Copyright (C) 1986-1993, 1998, 2004, 2007-2019
Thomas Williams, Colin Kelley and many others
gnuplot home: http://www.gnuplot.info
faq, bugs, etc: type "help FAQ"
immediate help: type "help" (plot window: hit 'h')
Terminal type is now 'qt'
gnuplot>
So somehow the dynamic linker of Ubuntu 20.04 has a kernel dependency
that isn't satisfied by good old 3.10.0-1160.
--
Götz Waschk ° Phone: +49 33762 77169
Deutsches Elektronen-Synchrotron DESY ° E-Mail: [log in to unmask]
Platanenallee 6
15738 Zeuthen Germany
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