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This is not accurate, the system packages are from the CentOS binary distribution. You might be thinking of C/C++ runtime libraries, which are distributed as separate packages used by the internal ("fbcode") binaries, but system binaries link to the standard distribution.

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(Hi Giuseppe!)

Right, the standard centos system binaries are used to provision services and manage hardware.

The internal services linking against the runtime libs you mention, are actually linking against about 2000 built from source packages, and are essentially a separate distro (with a distro in this sense being an ABI compatible set of libs running on a kernel)

I think that's not what people would normally call "the distribution" :) systemd, coreutils, ssh, shell, ... come from CentOS.

(Hi Pádraig!)

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