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Re: [Samba] winbind causing huge timeouts/delays since 4.8




On Sun, 24 Feb 2019 18:28:43 +0100
Ralph Böhme <slow@xxxxxxxxx> wrote:

> 
> Am 24.02.2019 um 16:42 schrieb Rowland Penny via samba
> <samba@xxxxxxxxxxxxxxx>:
> > On Sun, 24 Feb 2019 15:58:39 +0100 Ralph Böhme <slow@xxxxxxxxx>
> > wrote:
> >> Another thing that a customer has just been bitten by, was a subtle
> >> bug in winbindd's idmap cache that resulted in all xid2sid requests
> >> going through the idmap backend, iow winbindd issued LDAP requests.
> >> With a few thousand users, things came to a grinding halt.
> >> 
> >> https://bugzilla.samba.org/show_bug.cgi?id=13802
> >> 
> >> Patch just landed upstream.
> > 
> > That is the bug I was referring to and probably (amongst all the
> > other cruft) what was causing the OP's problem.
> 
> Unlikely.

It is was I thought, but as the OP's setup is so convoluted, it is hard
to say.

> 
> > However, this has nothing to
> > do with using the 'ad' backend with Active Directory. We keep
> > dancing around this problem, saying things like 'we need to fix
> > this', we have been saying this since Samba 4 was released.
> 
> Which problem? Fix what? Been saying what?

There have been numerous discussions about the 'ad' backend over the
years and they have all gone nowhere. The 'ad' backend still works in
the same way as it did when Samba 4 was released and you still have to
store the next uidNumber & gidNumber outside AD if you use the Samba
tools.

> 
> > Windows Uses the SID-RID to identify the user and the domain it
> > comes from, surely we can find a way to do this for Samba, we are
> > half way there with the 'rid' backend.
> 
> I'm not really what "there" implies for you, but it seems
> idmap_autorid is eventually the backend that takes you "there". :)

No it doesn't, at the moment, the only way to get the same ID on all
Unix machines (this includes DC's) is to use the 'ad' backend. You
think autorid is the way forward, well sorry, but in my opinion, it
isn't.

Rowland




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