On 10/22/20 3:21 PM, Louis Lagendijk wrote:
On Thu, 2020-10-22 at 15:13 +0200, Thomas Plant wrote:
Am 22.10.2020 um 14:11 schrieb Thomas Plant:
Hi,
we are upgrading some servers from C6 to C7 with a lot of user
accounts on them (UID>=500).
CentOS 7 has MIN_UID/MIN_GID 1000, Centos 6 has 500 in login.defs.
Can I change in /etc/login.defs MIN_UID/MIN_GID to 500 for C7? So
I
could just grep the users out from passwd/shadow/group files and
append them to the Centos7 passwd/shadow/group files.
Can this do any damage to CentOS7 later on? Thinking about
updates....
Thanks,
Thomas
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Thanks, for the hints.
Think I will go the lazy way and adapt login.defs. ;-)
Greetings,
Thomas
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You better don't do that:
when I looked at one of my C8 boxes there were many services that
require a system account (but not a global fixed one) were allocated
from the top of the 500-999 range. Bite the bullet and change user
accounts. to start from 1000. Especially when using NFS this may
otherwise come back and bite you
I've been though the need of similar changes at least twice. Fist time
when I was migrating servers from SunOS, where reserves UIG/GID number
were 0-100, to RedHat (and CentOS) Linuxes (0-500), and the second time
when Linux went up to 0-1000. In both cases the analyses what would be
right thing was short, and the transition was just to find how far up to
move UIDs/GIDs of existing users in the range 101-500 or 501-1000. The
rest of the users stayed the same. Otherwise you may get an "unusual"
for its breed system with lot of surprises in a future, especially if
some new sysadmin comes to take care if the machine.
Just my $0.02.
Valeri
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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
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