[Samba] winbind causing huge timeouts/delays since 4.8

Rowland Penny rpenny at samba.org
Sat Feb 23 13:07:21 UTC 2019

On Sat, 23 Feb 2019 13:47:54 +0100
Remy Zandwijk via samba <samba at lists.samba.org> wrote:

> > On 23 Feb 2019, at 09:33, Rowland Penny via samba
> > <samba at lists.samba.org> wrote:
> > 
> > If you have, as you have, 'files sss winbind' in the the passwd &
> > group line in nsswitch.conf, means this:
> > First /etc/passwd or /etc/group is searched and if the user or
> > group is found, this info is returned.
> > Next sssd will be asked, 'do you know this user or group ?' if
> > found, the info is returned.
> > Finally winbind will be asked, 'do you know this user or group ?' if
> > found, the info is returned.
> > 
> > Lets take a user called 'fred', this user is in AD. The first search
> > will return nothing, so sssd is asked, this 'asks' AD and returns
> > the users info. Finally, wait that's it, we have the info, there is
> > no need to ask winbind for anything.
> That is incorrect. Alexander stated:
> > No. we use max. 3 auth providers: (1. and 2. on all unix servers)
> > 1. unix (local passwd)
> >   for static OS/service accounts across all our env
> > 2. sssd (with unix ldap servers as provider)
> >   unix experienced user and application related service accounts
> > 3. samba/winbind
> >   for windows users/services needing access to a group of unix
> > servers
> And:
> > They don't - as stated above we use sssd for query/caching entries
> > from our ldap directory server and not Windows DomainConmtrollers -
> > also this is possible, but makes more trouble and don't provide
> > what samba's smb/windbind does.
> He clearly writes (in multiple emails) that sssd is configured to use
> his unix ldap servers and not AD.
> Maybe three sources of user databases is not regular, but I fail to
> see why this should be a problem (provided that usernames, uidNumbers
> and such are unique across the databases).

And there is the problem, if 'fred' is in /etc/passwd, that user will
be used, but what if you meant fred in ldap or AD ?

There is absolutely no point in having 4 databases (yes there are 4,
Unix, sssd, winbind and the ldap lines in smb.conf), they could all be
combined in AD. 

The main problem is that the OP wants Samba changing to cope with his
mess, it might be a valid change, but the reason for the change is


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