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> I could not reproduce on a clean centos7, so I'd like to grab nodepool
> image to have a closer look

After having a closer look, I see that image has requests 2.7
installed from pypi which overwrites python-requests RPM installation
and wreaks havoc when trying to upgrade RPM.
I'm not sure why and where is pypi used during the image build but it
should not be installed system-wide on RPM system. If really needed,
install it in venv.

Cheers,
Alan