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 >>> _______________________________________________ >>> CentOS mailing list >>> CentOS at centos.org >>> https://lists.centos.org/mailman/listinfo/centos >> >> Thanks, for the hints. >> >> Think I will go the lazy way and adapt login.defs. ;-) >> >> Greetings, >> Thomas >> _______________________________________________ >> CentOS mailing list >> CentOS at centos.org >> https://lists.centos.org/mailman/listinfo/centos >> > 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 > > _______________________________________________ > CentOS mailing list > CentOS at centos.org > https://lists.centos.org/mailman/listinfo/centos > -- ++++++++++++++++++++++++++++++++++++++++ Valeri Galtsev Sr System Administrator Department of Astronomy and Astrophysics Kavli Institute for Cosmological Physics University of Chicago Phone: 773-702-4247 ++++++++++++++++++++++++++++++++++++++++