[rhelv6-list] NFS ID map?
Joshua Baker-LePain
jlb17 at duke.edu
Tue Oct 22 19:44:27 UTC 2013
On Tue, 22 Oct 2013 at 12:35pm, Chris Adams wrote
> Once upon a time, Joshua Baker-LePain <jlb17 at duke.edu> said:
>> Are you using Kerberos with NFSv4? If not, then the numeric UIDs
>> and GIDs still must match. idmapd *will* map usernames for display
>> purposes (i.e. what 'ls -l' sees), but the numeric IDs are still
>> used for permissions. Clear as mud, ain't it?
>
> Oh, that may be why I've always been confused by the ID mapping (and
> avoided it). Now, I'm not using Kerberos, so it sounds like the ID
> mapping won't actually help me with my problem. <sigh>
>
> What's the point of ID mapping if it only maps them in some places?
> That's terribly confusing.
Yes. Yes it is.
> stat() sees the numeric ID mapped (and chown()), but I guess open()
> permission checks don't?
This (rather old) thread explains it better than I can:
http://thread.gmane.org/gmane.linux.nfsv4/7103/focus=7105
--
Joshua Baker-LePain
QB3 Shared Cluster Sysadmin
UCSF
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