A couple more links, I should have provided initially as they better support the argument.
First from Debian, I cannot find a list, but it is clearly mentioned. "0-99: Globally allocated by the Debian project, the same on every Debian system" https://www.debian.org/doc/debian-policy/ch-opersys.html#s9.2.2 This is even better, what Gentoo lacks, and could build upon. https://access.redhat.com/documentation/en-US/Red_Hat_Enterprise_Linux/5/html/ Deployment_Guide/s1-users-groups-standard-users.html Also carries to CentOS of course https://www.centos.org/docs/5/html/Deployment_Guide-en-US/s1-users-groups-standard-users.html Per previous links installing some RPMs that have fixed UID/GID will result in problems of other things are using it "The vdsm user however is fixed to a UID of 36 and the kvm group is fixed to a GID of 36. If UID 36 or GID 36 is already used by another account on the system then a conflict will arise during installation of the vdsm and qemu-kvm-rhev packages." https://access.redhat.com/documentation/en-US/ Red_Hat_Enterprise_Virtualization/3.5/html/Installation_Guide/sect- System_Accounts.html -- William L. Thomson Jr.
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