[Samba] Shares not accessible when using FQDN

Gaetan SLONGO gslongo at it-optics.com
Wed Aug 30 08:43:39 UTC 2017

Hi Rowland, 

Thank you for your answer. 
I think I have found a solution which could solve the issue until the next migration step. It tested it on another server which is not critital : 

    * Joining the server as a member and setup the shares as you suggest 
    * Use nss_ldap instead of nss_winbind (idmap) which will pick my unix ids 

In this setup it seems I can access to the shares with any DNS aliases/CNAME 

I know it is not a very proper setup but it seem to work and we can do it quickly 

What is your mind about this ? 

----- Mail original -----

De: "Rowland Penny via samba" <samba at lists.samba.org> 
À: samba at lists.samba.org 
Envoyé: Mercredi 30 Août 2017 10:06:20 
Objet : Re: [Samba] Shares not accessible when using FQDN 

On Wed, 30 Aug 2017 09:35:29 +0200 (CEST) 
Gaetan SLONGO <gslongo at it-optics.com> wrote: 

> Hi Rowland, 
> The reason is long to explain but shortly it was about huge amount of 
> data ~20TB stored on that server with unix user ID (comming from a 
> S3/LDAP setup). 
> On a DC mode it seems unix ID are in use instead of idmap id. 

No, not really, it is just a different way of doing things. On a DC 
idmap.ldb is used, this allocates IDs in the '3000000' range on a first 
come basis, this means that users (and groups) can have different IDs 
on different DCs. This can be overridden by giving users a uidNumber 
attribute containing whatever ID you require, the same goes for groups, 
but with gidNumber attributes. 

> CNAME is in added indeed. Regarding the migration as said 
> we came from S3/LDAP and go to 4.6. The entire future structure is 
> not fixed yet but at this time we have a DC, a Fileserver and 3 other 
> servers which should be simple fileservers (member) but currently are 
> DC 

If you were only a small organisation, you could use a DC as a 
fileserver, but you have to be aware of the limitations and backup 
everything on a regular basis, just how regular depends on how often 
you change AD, if you change it hourly, you should back it up hourly. 

However you seem to have large and complex requirements, so you 
should have at least two DCs with as many Unix domain members running 
as fileservers as you require. 

With multiple DCs, you only need to backup one DC, usually the 
one holding the FSMO roles. You will only need to backup the smb.conf 
from the fileservers and any data etc that they hold, you do not need 
to backup any other of the Samba files. You can (and should) use the 
same smb.conf on all Unix domain members, just don't set the 'netbios 
name' in any of them, Samba will fill this for you. 


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