Date: Tue, 29 Jun 2010 11:06:47 -0500 From: Dan Nelson <dnelson@allantgroup.com> To: "Rick C. Petty" <rick-freebsd2009@kiwi-computer.com> Cc: Adam Vande More <amvandemore@gmail.com>, Rick Macklem <rmacklem@uoguelph.ca>, freebsd-stable@freebsd.org, Ian Smith <smithi@nimnet.asn.au> Subject: Re: Why is NFSv4 so slow? (root/toor) Message-ID: <20100629160647.GD50409@dan.emsphone.com> In-Reply-To: <20100629153252.GA71786@kay.kiwi-computer.com> References: <20100627221607.GA31646@kay.kiwi-computer.com> <Pine.GSO.4.63.1006271949220.3233@muncher.cs.uoguelph.ca> <20100628031401.GA45282@kay.kiwi-computer.com> <Pine.GSO.4.63.1006280017190.2680@muncher.cs.uoguelph.ca> <20100628140054.GA52174@kay.kiwi-computer.com> <Pine.GSO.4.63.1006281950260.13834@muncher.cs.uoguelph.ca> <20100629134033.O9227@sola.nimnet.asn.au> <Pine.GSO.4.63.1006291054350.24800@muncher.cs.uoguelph.ca> <AANLkTimjDIQ4FRYAD3N_L1C1VermRX3S1PhvG5dSvz5A@mail.gmail.com> <20100629153252.GA71786@kay.kiwi-computer.com>
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In the last episode (Jun 29), Rick C. Petty said: > On Tue, Jun 29, 2010 at 10:20:57AM -0500, Adam Vande More wrote: > > On Tue, Jun 29, 2010 at 9:58 AM, Rick Macklem <rmacklem@uoguelph.ca> wrote: > > > > > I suppose if the FreeBSD world feels that "root" and "toor" must both > > > exist in the password database, then "nfsuserd" could be hacked to > > > handle the case of translating uid 0 to "root" without calling > > > getpwuid(). It seems ugly, but if deleting "toor" from the password > > > database upsets people, I can do that. > > > > I agree with Ian on this. I don't use toor either, but have seen people > > use it, and sometimes it will get recommended here for various reasons > > e.g. running a root account with a different default shell. It > > wouldn't bother me having to do this provided it was documented, but > > having to do so would be a POLA violation to many users I think. > > To be fair, I'm not sure this is even a problem. Rick M. only suggested > it as a possibility. I would think that getpwuid() would return the first > match which has always been root. At least that's what it does when > scanning the passwd file; I'm not sure about NIS. If someone can prove > that this will cause a problem with NFSv4, we could consider hackingit. > Otherwise I don't think we should change this behavior yet. If there are multiple users that map to the same userid, nscd on Linux will select one name at random and return it for getpwuid() calls. I haven't seen this behaviour on FreeBSD or Solaris, though. They always seem to return the first entry in the passwd file. -- Dan Nelson dnelson@allantgroup.com
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