Well, there are extended ACLs if they're available in CentOS, when I first worked with them (long ago) they were new (and on a different Distro). I hope support for them has improved. They allow multiple users/groups to be assigned permissions to a file/directory. The problem then was that chmod (and other programs) were not extended-ACL-aware and could over-ride extended ACLs. There was a mechanism to recover from the situation but what it basically came down to was eternal vigilance - the system administrators had to understand (and agree about) extended ACLs and be careful/diligent in applying them. There are hacks which could possibly help (rename chmod and replace it with a script warning about extended ACLs) but, in the final analysis, it's not a decision to be undertaken lightly (unless the situation has changed dramatically). Leroy Tennison Network Information/Cyber Security Specialist E: leroy at datavoiceint.com 2220 Bush Dr McKinney, Texas 75070 www.datavoiceint.com TThis message has been sent on behalf of a company that is part of the Harris Operating Group of Constellation Software Inc. These companies are listed here . If you prefer not to be contacted by Harris Operating Group please notify us . This message is intended exclusively for the individual or entity to which it is addressed. This communication may contain information that is proprietary, privileged or confidential or otherwise legally exempt from disclosure. If you are not the named addressee, you are not authorized to read, print, retain, copy or disseminate this message or any part of it. If you have received this message in error, please notify the sender immediately by e-mail and delete all copies of the message. ________________________________________ From: CentOS <centos-bounces at centos.org> on behalf of Frank Thommen <list.centos at drosera.ch> Sent: Tuesday, November 27, 2018 7:25 AM To: CentOS mailing list Subject: [EXTERNAL] [CentOS] Tools/mechanisms for the management of access permissions in big filebased datasets Hello, we are currently managing access permissions through classical user-group-others permissions on a multi-petabyte directory tree with partially very deep and broad directories. Projects are represented by directory trees and mapped through GIDs. Lately we had lots of "singular" permission request (one single user needs access to a single dataset but should not be able to see all other datasets belonging to the same project). We realized, that the UGO model doesn't scale and is becoming more and more unmanageable. Can you recommend tools/mechanisms/technologies to overcome the drawbacks of the UGO model? We are thinking about some purely ACL based mechanism (but are open to other ideas). All filesystems in question are mounted via NFSv4 and the clients are (almost) completely CentOS 7.x hsots. Ideally the tool would have some web UI and some kind of (REST)API which allows us to modify permissions from our inhouse data management application (which does /not/ manage permissions, just the structure of the data). Additionally it should be able to visualize/report permissions in directory. I wasn't very successful in googling possible candidates, hence the question to the list. Cheers frank _______________________________________________ CentOS mailing list CentOS at centos.org https://lists.centos.org/mailman/listinfo/centos